首先，處理按鍵按下後，可以通過傳送廣播讓應用層識別按鍵事件，那麼怎麼來發送，可以找到下面這個檔案:

frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

對應這個檔案，我們找到這個方法，程式碼很多，部分shenglue

/** {@inheritDoc} */
    @Override
    public long interceptKeyBeforeDispatching(WindowState win, KeyEvent event, int policyFlags) {
        final boolean keyguardOn = keyguardOn();
        final int keyCode = event.getKeyCode();
        final int repeatCount = event.getRepeatCount();
        final int metaState = event.getMetaState();
        final int flags = event.getFlags();
        final boolean down = event.getAction() == KeyEvent.ACTION_DOWN;
        final boolean canceled = event.isCanceled();

        if (DEBUG_INPUT) {
            Log.d(TAG, "interceptKeyTi keyCode=" + keyCode + " down=" + down + " repeatCount="
                    + repeatCount + " keyguardOn=" + keyguardOn + " mHomePressed=" + mHomePressed
                    + " canceled=" + canceled);
        }

        // If we think we might have a volume down & power key chord on the way
        // but we're not sure, then tell the dispatcher to wait a little while and
        // try again later before dispatching.
        if (mScreenshotChordEnabled && (flags & KeyEvent.FLAG_FALLBACK) == 0) {
            if (mVolumeDownKeyTriggered && !mPowerKeyTriggered) {
                final long now = SystemClock.uptimeMillis();
                final long timeoutTime = mVolumeDownKeyTime + SCREENSHOT_CHORD_DEBOUNCE_DELAY_MILLIS;
                if (now < timeoutTime) {
                    return timeoutTime - now;
                }
            }
            if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN
                    && mVolumeDownKeyConsumedByScreenshotChord) {
                if (!down) {
                    mVolumeDownKeyConsumedByScreenshotChord = false;
                }
                return -1;
            }
        }

        // Cancel any pending meta actions if we see any other keys being pressed between the down
        // of the meta key and its corresponding up.
        if (mPendingMetaAction && !KeyEvent.isMetaKey(keyCode)) {
            mPendingMetaAction = false;
        }

        // First we always handle the home key here, so applications
        // can never break it, although if keyguard is on, we do let
        // it handle it, because that gives us the correct 5 second
        // timeout.
        if (keyCode == KeyEvent.KEYCODE_HOME) {

            // If we have released the home key, and didn't do anything else
            // while it was pressed, then it is time to go home!
            if (!down) {
                cancelPreloadRecentApps();

                mHomePressed = false;
                if (mHomeConsumed) {
                    mHomeConsumed = false;
                    return -1;
                }

                if (canceled) {
                    Log.i(TAG, "Ignoring HOME; event canceled.");
                    return -1;
                }

                // If an incoming call is ringing, HOME is totally disabled.
                // (The user is already on the InCallUI at this point,
                // and his ONLY options are to answer or reject the call.)
                TelecomManager telecomManager = getTelecommService();
                if (telecomManager != null && telecomManager.isRinging()) {
                    Log.i(TAG, "Ignoring HOME; there's a ringing incoming call.");
                    return -1;
                }

                // Delay handling home if a double-tap is possible.
                if (mDoubleTapOnHomeBehavior != DOUBLE_TAP_HOME_NOTHING) {
                    mHandler.removeCallbacks(mHomeDoubleTapTimeoutRunnable); // just in case
                    mHomeDoubleTapPending = true;
                    mHandler.postDelayed(mHomeDoubleTapTimeoutRunnable,
                            ViewConfiguration.getDoubleTapTimeout());
                    return -1;
                }

                // If there's a dream running then use home to escape the dream
                // but don't actually go home.
                if (mDreamManagerInternal != null && mDreamManagerInternal.isDreaming()) {
                    mDreamManagerInternal.stopDream(false /*immediate*/);
                    return -1;
                }

                // Go home!
                launchHomeFromHotKey();
                return -1;
            }
 

 /** {@inheritDoc} */
	//新增CamerakeyAction
	private String CamerakeyAction = null;
    @Override
    public long interceptKeyBeforeDispatching(WindowState win, KeyEvent event, int policyFlags) {
        final boolean keyguardOn = keyguardOn();
        final int keyCode = event.getKeyCode();
        final int repeatCount = event.getRepeatCount();
        final int metaState = event.getMetaState();
        final int flags = event.getFlags();
        final boolean down = event.getAction() == KeyEvent.ACTION_DOWN;
        final boolean canceled = event.isCanceled();

        if (DEBUG_INPUT) {
            Log.d(TAG, "interceptKeyTi keyCode=" + keyCode + " down=" + down + " repeatCount="
                    + repeatCount + " keyguardOn=" + keyguardOn + " mHomePressed=" + mHomePressed
                    + " canceled=" + canceled);
        }

		if (true ) {
             CamerakeyAction = null;
             //如果按鍵事件收到是KEYCODE_CAMERA
             if(keyCode == KeyEvent.KEYCODE_CAMERA)
             {
				 //那麼定義按鍵傳送的廣播標題
                 CamerakeyAction = "com.camera_k.broadcast.camerabutton";
             }
             if ( null != CamerakeyAction ) {
                 mHandler.post( new Runnable() {
                         public void run() {
							 //以下為傳送廣播的內容，當按鍵按下後
							 //傳送key_code key_action等。
                             Intent intent = new Intent(CamerakeyAction);
                             intent.putExtra("key_code", keyCode);
                             intent.putExtra("key_action", keyAction);
                             intent.putExtra("repeat_count", repeatCount);
                             intent.putExtra("device_id", deviceID);
                             intent.putExtra("down_time", downTime);
                             intent.putExtra("event_time", eventTime);
                             intent.putExtra("number", number);
                             intent.putExtra("flags", flags);
                             intent.putExtra("scan_code", scanCode);
                             intent.putExtra("source", source);
                             intent.putExtra("display_label", displayLabel);
                             intent.putExtra("meta_state", metaState);
                             intent.putExtra("unicode_char", unicodeChar);
                             intent.putExtra("characters", characters);
							 //傳送廣播
                             mContext.sendBroadcast(intent);
                         }
                 } );
             }
         };	
 

/*
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.internal.policy.impl;

import android.app.ActivityManager;
import android.app.ActivityManagerNative;
import android.app.AppOpsManager;
import android.app.IUiModeManager;
import android.app.ProgressDialog;
import android.app.SearchManager;
import android.app.StatusBarManager;
import android.app.UiModeManager;
import android.content.ActivityNotFoundException;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.res.CompatibilityInfo;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.database.ContentObserver;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.media.AudioAttributes;
import android.media.AudioManager;
import android.media.IAudioService;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.media.session.MediaSessionLegacyHelper;
import android.os.Bundle;
import android.os.FactoryTest;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.os.Messenger;
import android.os.PowerManager;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.os.UEventObserver;
import android.os.UserHandle;
import android.os.Vibrator;
import android.provider.MediaStore;
import android.provider.Settings;
import android.service.dreams.DreamManagerInternal;
import android.service.dreams.DreamService;
import android.service.dreams.IDreamManager;
import android.speech.RecognizerIntent;
import android.telecom.TelecomManager;
import android.util.DisplayMetrics;
import android.util.EventLog;
import android.util.Log;
import android.util.Slog;
import android.util.SparseArray;
import android.view.Display;
import android.view.Gravity;
import android.view.HapticFeedbackConstants;
import android.view.IApplicationToken;
import android.view.IWindowManager;
import android.view.InputChannel;
import android.view.InputDevice;
import android.view.InputEvent;
import android.view.InputEventReceiver;
import android.view.KeyCharacterMap;
import android.view.KeyCharacterMap.FallbackAction;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.Surface;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.Window;
import android.view.WindowManager;
import android.view.WindowManagerGlobal;
import android.view.WindowManagerInternal;
import android.view.WindowManagerPolicy;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.AnimationUtils;

import com.android.internal.R;
import com.android.internal.policy.IKeyguardService;
import com.android.internal.policy.IKeyguardServiceConstants;
import com.android.internal.policy.PolicyManager;
import com.android.internal.policy.impl.keyguard.KeyguardServiceDelegate;
import com.android.internal.policy.impl.keyguard.KeyguardServiceDelegate.ShowListener;
import com.android.internal.statusbar.IStatusBarService;
import com.android.internal.widget.PointerLocationView;
import com.android.server.LocalServices;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashSet;

import static android.view.WindowManager.LayoutParams.*;
import static android.view.WindowManagerPolicy.WindowManagerFuncs.LID_ABSENT;
import static android.view.WindowManagerPolicy.WindowManagerFuncs.LID_OPEN;
import static android.view.WindowManagerPolicy.WindowManagerFuncs.LID_CLOSED;
import static android.view.WindowManagerPolicy.WindowManagerFuncs.CAMERA_LENS_COVER_ABSENT;
import static android.view.WindowManagerPolicy.WindowManagerFuncs.CAMERA_LENS_UNCOVERED;
import static android.view.WindowManagerPolicy.WindowManagerFuncs.CAMERA_LENS_COVERED;

/**
 * WindowManagerPolicy implementation for the Android phone UI.  This
 * introduces a new method suffix, Lp, for an internal lock of the
 * PhoneWindowManager.  This is used to protect some internal state, and
 * can be acquired with either the Lw and Li lock held, so has the restrictions
 * of both of those when held.
 */
public class PhoneWindowManager implements WindowManagerPolicy {
    static final String TAG = "WindowManager";
    static final boolean DEBUG = false;
    static final boolean localLOGV = false;
    static final boolean DEBUG_LAYOUT = false;
    static final boolean DEBUG_INPUT = false;
    static final boolean DEBUG_STARTING_WINDOW = false;
    static final boolean DEBUG_WAKEUP = false;
    static final boolean SHOW_STARTING_ANIMATIONS = true;
    static final boolean SHOW_PROCESSES_ON_ALT_MENU = false;

    // Whether to allow dock apps with METADATA_DOCK_HOME to temporarily take over the Home key.
    // No longer recommended for desk docks; still useful in car docks.
    static final boolean ENABLE_CAR_DOCK_HOME_CAPTURE = true;
    static final boolean ENABLE_DESK_DOCK_HOME_CAPTURE = false;

    static final int SHORT_PRESS_POWER_NOTHING = 0;
    static final int SHORT_PRESS_POWER_GO_TO_SLEEP = 1;
    static final int SHORT_PRESS_POWER_REALLY_GO_TO_SLEEP = 2;
    static final int SHORT_PRESS_POWER_REALLY_GO_TO_SLEEP_AND_GO_HOME = 3;

    static final int LONG_PRESS_POWER_NOTHING = 0;
    static final int LONG_PRESS_POWER_GLOBAL_ACTIONS = 1;
    static final int LONG_PRESS_POWER_SHUT_OFF = 2;
    static final int LONG_PRESS_POWER_SHUT_OFF_NO_CONFIRM = 3;

    // These need to match the documentation/constant in
    // core/res/res/values/config.xml
    static final int LONG_PRESS_HOME_NOTHING = 0;
    static final int LONG_PRESS_HOME_RECENT_SYSTEM_UI = 1;
    static final int LONG_PRESS_HOME_ASSIST = 2;

    static final int DOUBLE_TAP_HOME_NOTHING = 0;
    static final int DOUBLE_TAP_HOME_RECENT_SYSTEM_UI = 1;

    static final int APPLICATION_MEDIA_SUBLAYER = -2;
    static final int APPLICATION_MEDIA_OVERLAY_SUBLAYER = -1;
    static final int APPLICATION_PANEL_SUBLAYER = 1;
    static final int APPLICATION_SUB_PANEL_SUBLAYER = 2;

    static public final String SYSTEM_DIALOG_REASON_KEY = "reason";
    static public final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions";
    static public final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";
    static public final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";
    static public final String SYSTEM_DIALOG_REASON_ASSIST = "assist";

    /**
     * These are the system UI flags that, when changing, can cause the layout
     * of the screen to change.
     */
    static final int SYSTEM_UI_CHANGING_LAYOUT =
              View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
            | View.SYSTEM_UI_FLAG_FULLSCREEN
            | View.STATUS_BAR_TRANSLUCENT
            | View.NAVIGATION_BAR_TRANSLUCENT
            | View.SYSTEM_UI_TRANSPARENT;

    private static final AudioAttributes VIBRATION_ATTRIBUTES = new AudioAttributes.Builder()
            .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
            .setUsage(AudioAttributes.USAGE_ASSISTANCE_SONIFICATION)
            .build();

    /**
     * Keyguard stuff
     */
    private WindowState mKeyguardScrim;
    private boolean mKeyguardHidden;
    private boolean mKeyguardDrawnOnce;

    /* Table of Application Launch keys.  Maps from key codes to intent categories.
     *
     * These are special keys that are used to launch particular kinds of applications,
     * such as a web browser.  HID defines nearly a hundred of them in the Consumer (0x0C)
     * usage page.  We don't support quite that many yet...
     */
    static SparseArray<String> sApplicationLaunchKeyCategories;
    static {
        sApplicationLaunchKeyCategories = new SparseArray<String>();
        sApplicationLaunchKeyCategories.append(
                KeyEvent.KEYCODE_EXPLORER, Intent.CATEGORY_APP_BROWSER);
        sApplicationLaunchKeyCategories.append(
                KeyEvent.KEYCODE_ENVELOPE, Intent.CATEGORY_APP_EMAIL);
        sApplicationLaunchKeyCategories.append(
                KeyEvent.KEYCODE_CONTACTS, Intent.CATEGORY_APP_CONTACTS);
        sApplicationLaunchKeyCategories.append(
                KeyEvent.KEYCODE_CALENDAR, Intent.CATEGORY_APP_CALENDAR);
        sApplicationLaunchKeyCategories.append(
                KeyEvent.KEYCODE_MUSIC, Intent.CATEGORY_APP_MUSIC);
        sApplicationLaunchKeyCategories.append(
                KeyEvent.KEYCODE_CALCULATOR, Intent.CATEGORY_APP_CALCULATOR);
    }

    /** Amount of time (in milliseconds) to wait for windows drawn before powering on. */
    static final int WAITING_FOR_DRAWN_TIMEOUT = 1000;

    /**
     * Lock protecting internal state.  Must not call out into window
     * manager with lock held.  (This lock will be acquired in places
     * where the window manager is calling in with its own lock held.)
     */
    private final Object mLock = new Object();

    Context mContext;
    IWindowManager mWindowManager;
    WindowManagerFuncs mWindowManagerFuncs;
    WindowManagerInternal mWindowManagerInternal;
    PowerManager mPowerManager;
    DreamManagerInternal mDreamManagerInternal;
    IStatusBarService mStatusBarService;
    boolean mPreloadedRecentApps;
    final Object mServiceAquireLock = new Object();
    Vibrator mVibrator; // Vibrator for giving feedback of orientation changes
    SearchManager mSearchManager;
    AccessibilityManager mAccessibilityManager;

    // Vibrator pattern for haptic feedback of a long press.
    long[] mLongPressVibePattern;

    // Vibrator pattern for haptic feedback of virtual key press.
    long[] mVirtualKeyVibePattern;

    // Vibrator pattern for a short vibration.
    long[] mKeyboardTapVibePattern;

    // Vibrator pattern for a short vibration when tapping on an hour/minute tick of a Clock.
    long[] mClockTickVibePattern;

    // Vibrator pattern for a short vibration when tapping on a day/month/year date of a Calendar.
    long[] mCalendarDateVibePattern;

    // Vibrator pattern for haptic feedback during boot when safe mode is disabled.
    long[] mSafeModeDisabledVibePattern;

    // Vibrator pattern for haptic feedback during boot when safe mode is enabled.
    long[] mSafeModeEnabledVibePattern;

    /** If true, hitting shift & menu will broadcast Intent.ACTION_BUG_REPORT */
    boolean mEnableShiftMenuBugReports = false;

    boolean mSafeMode;
    WindowState mStatusBar = null;
    int mStatusBarHeight;
    WindowState mNavigationBar = null;
    boolean mHasNavigationBar = false;
    boolean mCanHideNavigationBar = false;
    boolean mNavigationBarCanMove = false; // can the navigation bar ever move to the side?
    boolean mNavigationBarOnBottom = true; // is the navigation bar on the bottom *right now*?
    int[] mNavigationBarHeightForRotation = new int[4];
    int[] mNavigationBarWidthForRotation = new int[4];

    boolean mBootMessageNeedsHiding;
    KeyguardServiceDelegate mKeyguardDelegate;
    final Runnable mWindowManagerDrawCallback = new Runnable() {
        @Override
        public void run() {
            if (DEBUG_WAKEUP) Slog.i(TAG, "All windows ready for display!");
            mHandler.sendEmptyMessage(MSG_WINDOW_MANAGER_DRAWN_COMPLETE);
        }
    };
    final ShowListener mKeyguardDelegateCallback = new ShowListener() {
        @Override
        public void onShown(IBinder windowToken) {
            if (DEBUG_WAKEUP) Slog.d(TAG, "mKeyguardDelegate.ShowListener.onShown.");
            mHandler.sendEmptyMessage(MSG_KEYGUARD_DRAWN_COMPLETE);
        }
    };

    GlobalActions mGlobalActions;
    volatile boolean mPowerKeyHandled; // accessed from input reader and handler thread
    boolean mPendingPowerKeyUpCanceled;
    Handler mHandler;
    WindowState mLastInputMethodWindow = null;
    WindowState mLastInputMethodTargetWindow = null;

    boolean mRecentsVisible;
    int mRecentAppsHeldModifiers;
    boolean mLanguageSwitchKeyPressed;

    int mLidState = LID_ABSENT;
    int mCameraLensCoverState = CAMERA_LENS_COVER_ABSENT;
    boolean mHaveBuiltInKeyboard;

    boolean mSystemReady;
    boolean mSystemBooted;
    boolean mHdmiPlugged;
    IUiModeManager mUiModeManager;
    int mUiMode;
    int mDockMode = Intent.EXTRA_DOCK_STATE_UNDOCKED;
    int mLidOpenRotation;
    int mCarDockRotation;
    int mDeskDockRotation;
    int mUndockedHdmiRotation;
    int mDemoHdmiRotation;
    boolean mDemoHdmiRotationLock;

    boolean mWakeGestureEnabledSetting;
    MyWakeGestureListener mWakeGestureListener;

    // Default display does not rotate, apps that require non-default orientation will have to
    // have the orientation emulated.
    private boolean mForceDefaultOrientation = false;

    int mUserRotationMode = WindowManagerPolicy.USER_ROTATION_FREE;
    int mUserRotation = Surface.ROTATION_0;
    boolean mAccelerometerDefault;

    boolean mSupportAutoRotation;
    int mAllowAllRotations = -1;
    boolean mCarDockEnablesAccelerometer;
    boolean mDeskDockEnablesAccelerometer;
    int mLidKeyboardAccessibility;
    int mLidNavigationAccessibility;
    boolean mLidControlsSleep;
    int mShortPressOnPowerBehavior = -1;
    int mLongPressOnPowerBehavior = -1;
    boolean mAwake;
    boolean mScreenOnEarly;
    boolean mScreenOnFully;
    ScreenOnListener mScreenOnListener;
    boolean mKeyguardDrawComplete;
    boolean mWindowManagerDrawComplete;
    boolean mOrientationSensorEnabled = false;
    int mCurrentAppOrientation = ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
    boolean mHasSoftInput = false;
    boolean mTranslucentDecorEnabled = true;

    int mPointerLocationMode = 0; // guarded by mLock

    // The last window we were told about in focusChanged.
    WindowState mFocusedWindow;
    IApplicationToken mFocusedApp;

    PointerLocationView mPointerLocationView;

    // The current size of the screen; really; extends into the overscan area of
    // the screen and doesn't account for any system elements like the status bar.
    int mOverscanScreenLeft, mOverscanScreenTop;
    int mOverscanScreenWidth, mOverscanScreenHeight;
    // The current visible size of the screen; really; (ir)regardless of whether the status
    // bar can be hidden but not extending into the overscan area.
    int mUnrestrictedScreenLeft, mUnrestrictedScreenTop;
    int mUnrestrictedScreenWidth, mUnrestrictedScreenHeight;
    // Like mOverscanScreen*, but allowed to move into the overscan region where appropriate.
    int mRestrictedOverscanScreenLeft, mRestrictedOverscanScreenTop;
    int mRestrictedOverscanScreenWidth, mRestrictedOverscanScreenHeight;
    // The current size of the screen; these may be different than (0,0)-(dw,dh)
    // if the status bar can't be hidden; in that case it effectively carves out
    // that area of the display from all other windows.
    int mRestrictedScreenLeft, mRestrictedScreenTop;
    int mRestrictedScreenWidth, mRestrictedScreenHeight;
    // During layout, the current screen borders accounting for any currently
    // visible system UI elements.
    int mSystemLeft, mSystemTop, mSystemRight, mSystemBottom;
    // For applications requesting stable content insets, these are them.
    int mStableLeft, mStableTop, mStableRight, mStableBottom;
    // For applications requesting stable content insets but have also set the
    // fullscreen window flag, these are the stable dimensions without the status bar.
    int mStableFullscreenLeft, mStableFullscreenTop;
    int mStableFullscreenRight, mStableFullscreenBottom;
    // During layout, the current screen borders with all outer decoration
    // (status bar, input method dock) accounted for.
    int mCurLeft, mCurTop, mCurRight, mCurBottom;
    // During layout, the frame in which content should be displayed
    // to the user, accounting for all screen decoration except for any
    // space they deem as available for other content.  This is usually
    // the same as mCur*, but may be larger if the screen decor has supplied
    // content insets.
    int mContentLeft, mContentTop, mContentRight, mContentBottom;
    // During layout, the frame in which voice content should be displayed
    // to the user, accounting for all screen decoration except for any
    // space they deem as available for other content.
    int mVoiceContentLeft, mVoiceContentTop, mVoiceContentRight, mVoiceContentBottom;
    // During layout, the current screen borders along which input method
    // windows are placed.
    int mDockLeft, mDockTop, mDockRight, mDockBottom;
    // During layout, the layer at which the doc window is placed.
    int mDockLayer;
    // During layout, this is the layer of the status bar.
    int mStatusBarLayer;
    int mLastSystemUiFlags;
    // Bits that we are in the process of clearing, so we want to prevent
    // them from being set by applications until everything has been updated
    // to have them clear.
    int mResettingSystemUiFlags = 0;
    // Bits that we are currently always keeping cleared.
    int mForceClearedSystemUiFlags = 0;
    // What we last reported to system UI about whether the compatibility
    // menu needs to be displayed.
    boolean mLastFocusNeedsMenu = false;

    FakeWindow mHideNavFakeWindow = null;

    static final Rect mTmpParentFrame = new Rect();
    static final Rect mTmpDisplayFrame = new Rect();
    static final Rect mTmpOverscanFrame = new Rect();
    static final Rect mTmpContentFrame = new Rect();
    static final Rect mTmpVisibleFrame = new Rect();
    static final Rect mTmpDecorFrame = new Rect();
    static final Rect mTmpStableFrame = new Rect();
    static final Rect mTmpNavigationFrame = new Rect();

    WindowState mTopFullscreenOpaqueWindowState;
    HashSet<IApplicationToken> mAppsToBeHidden = new HashSet<IApplicationToken>();
    HashSet<IApplicationToken> mAppsThatDismissKeyguard = new HashSet<IApplicationToken>();
    boolean mTopIsFullscreen;
    boolean mForceStatusBar;
    boolean mForceStatusBarFromKeyguard;
    boolean mHideLockScreen;
    boolean mForcingShowNavBar;
    int mForcingShowNavBarLayer;

    // States of keyguard dismiss.
    private static final int DISMISS_KEYGUARD_NONE = 0; // Keyguard not being dismissed.
    private static final int DISMISS_KEYGUARD_START = 1; // Keyguard needs to be dismissed.
    private static final int DISMISS_KEYGUARD_CONTINUE = 2; // Keyguard has been dismissed.
    int mDismissKeyguard = DISMISS_KEYGUARD_NONE;

    /** The window that is currently dismissing the keyguard. Dismissing the keyguard must only
     * be done once per window. */
    private WindowState mWinDismissingKeyguard;

    /** The window that is currently showing "over" the keyguard. If there is an app window
     * belonging to another app on top of this the keyguard shows. If there is a fullscreen
     * app window under this, still dismiss the keyguard but don't show the app underneath. Show
     * the wallpaper. */
    private WindowState mWinShowWhenLocked;

    boolean mShowingLockscreen;
    boolean mShowingDream;
    boolean mDreamingLockscreen;
    boolean mHomePressed;
    boolean mHomeConsumed;
    boolean mHomeDoubleTapPending;
    Intent mHomeIntent;
    Intent mCarDockIntent;
    Intent mDeskDockIntent;
    boolean mSearchKeyShortcutPending;
    boolean mConsumeSearchKeyUp;
    boolean mAssistKeyLongPressed;
    boolean mPendingMetaAction;

    // support for activating the lock screen while the screen is on
    boolean mAllowLockscreenWhenOn;
    int mLockScreenTimeout;
    boolean mLockScreenTimerActive;

    // Behavior of ENDCALL Button.  (See Settings.System.END_BUTTON_BEHAVIOR.)
    int mEndcallBehavior;

    // Behavior of POWER button while in-call and screen on.
    // (See Settings.Secure.INCALL_POWER_BUTTON_BEHAVIOR.)
    int mIncallPowerBehavior;

    Display mDisplay;

    int mLandscapeRotation = 0;  // default landscape rotation
    int mSeascapeRotation = 0;   // "other" landscape rotation, 180 degrees from mLandscapeRotation
    int mPortraitRotation = 0;   // default portrait rotation
    int mUpsideDownRotation = 0; // "other" portrait rotation

    int mOverscanLeft = 0;
    int mOverscanTop = 0;
    int mOverscanRight = 0;
    int mOverscanBottom = 0;

    // What we do when the user long presses on home
    private int mLongPressOnHomeBehavior;

    // What we do when the user double-taps on home
    private int mDoubleTapOnHomeBehavior;

    // Screenshot trigger states
    // Time to volume and power must be pressed within this interval of each other.
    private static final long SCREENSHOT_CHORD_DEBOUNCE_DELAY_MILLIS = 150;
    // Increase the chord delay when taking a screenshot from the keyguard
    private static final float KEYGUARD_SCREENSHOT_CHORD_DELAY_MULTIPLIER = 2.5f;
    private boolean mScreenshotChordEnabled;
    private boolean mVolumeDownKeyTriggered;
    private long mVolumeDownKeyTime;
    private boolean mVolumeDownKeyConsumedByScreenshotChord;
    private boolean mVolumeUpKeyTriggered;
    private boolean mPowerKeyTriggered;
    private long mPowerKeyTime;

    /* The number of steps between min and max brightness */
    private static final int BRIGHTNESS_STEPS = 10;

    SettingsObserver mSettingsObserver;
    ShortcutManager mShortcutManager;
    PowerManager.WakeLock mBroadcastWakeLock;
    boolean mHavePendingMediaKeyRepeatWithWakeLock;

    private int mCurrentUserId;

    // Maps global key codes to the components that will handle them.
    private GlobalKeyManager mGlobalKeyManager;

    // Fallback actions by key code.
    private final SparseArray<KeyCharacterMap.FallbackAction> mFallbackActions =
            new SparseArray<KeyCharacterMap.FallbackAction>();

    private final LogDecelerateInterpolator mLogDecelerateInterpolator
            = new LogDecelerateInterpolator(100, 0);

    private static final int MSG_ENABLE_POINTER_LOCATION = 1;
    private static final int MSG_DISABLE_POINTER_LOCATION = 2;
    private static final int MSG_DISPATCH_MEDIA_KEY_WITH_WAKE_LOCK = 3;
    private static final int MSG_DISPATCH_MEDIA_KEY_REPEAT_WITH_WAKE_LOCK = 4;
    private static final int MSG_KEYGUARD_DRAWN_COMPLETE = 5;
    private static final int MSG_KEYGUARD_DRAWN_TIMEOUT = 6;
    private static final int MSG_WINDOW_MANAGER_DRAWN_COMPLETE = 7;
    private static final int MSG_DISPATCH_SHOW_RECENTS = 9;
    private static final int MSG_DISPATCH_SHOW_GLOBAL_ACTIONS = 10;
    private static final int MSG_HIDE_BOOT_MESSAGE = 11;
    private static final int MSG_LAUNCH_VOICE_ASSIST_WITH_WAKE_LOCK = 12;

    private class PolicyHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MSG_ENABLE_POINTER_LOCATION:
                    enablePointerLocation();
                    break;
                case MSG_DISABLE_POINTER_LOCATION:
                    disablePointerLocation();
                    break;
                case MSG_DISPATCH_MEDIA_KEY_WITH_WAKE_LOCK:
                    dispatchMediaKeyWithWakeLock((KeyEvent)msg.obj);
                    break;
                case MSG_DISPATCH_MEDIA_KEY_REPEAT_WITH_WAKE_LOCK:
                    dispatchMediaKeyRepeatWithWakeLock((KeyEvent)msg.obj);
                    break;
                case MSG_DISPATCH_SHOW_RECENTS:
                    showRecentApps(false);
                    break;
                case MSG_DISPATCH_SHOW_GLOBAL_ACTIONS:
                    showGlobalActionsInternal();
                    break;
                case MSG_KEYGUARD_DRAWN_COMPLETE:
                    if (DEBUG_WAKEUP) Slog.w(TAG, "Setting mKeyguardDrawComplete");
                    finishKeyguardDrawn();
                    break;
                case MSG_KEYGUARD_DRAWN_TIMEOUT:
                    Slog.w(TAG, "Keyguard drawn timeout. Setting mKeyguardDrawComplete");
                    finishKeyguardDrawn();
                    break;
                case MSG_WINDOW_MANAGER_DRAWN_COMPLETE:
                    if (DEBUG_WAKEUP) Slog.w(TAG, "Setting mWindowManagerDrawComplete");
                    finishWindowsDrawn();
                    break;
                case MSG_HIDE_BOOT_MESSAGE:
                    handleHideBootMessage();
                    break;
                case MSG_LAUNCH_VOICE_ASSIST_WITH_WAKE_LOCK:
                    launchVoiceAssistWithWakeLock(msg.arg1 != 0);
                    break;
            }
        }
    }

    private UEventObserver mHDMIObserver = new UEventObserver() {
        @Override
        public void onUEvent(UEventObserver.UEvent event) {
            setHdmiPlugged("1".equals(event.get("SWITCH_STATE")));
        }
    };

    class SettingsObserver extends ContentObserver {
        SettingsObserver(Handler handler) {
            super(handler);
        }

        void observe() {
            // Observe all users' changes
            ContentResolver resolver = mContext.getContentResolver();
            resolver.registerContentObserver(Settings.System.getUriFor(
                    Settings.System.END_BUTTON_BEHAVIOR), false, this,
                    UserHandle.USER_ALL);
            resolver.registerContentObserver(Settings.Secure.getUriFor(
                    Settings.Secure.INCALL_POWER_BUTTON_BEHAVIOR), false, this,
                    UserHandle.USER_ALL);
            resolver.registerContentObserver(Settings.Secure.getUriFor(
                    Settings.Secure.WAKE_GESTURE_ENABLED), false, this,
                    UserHandle.USER_ALL);
            resolver.registerContentObserver(Settings.System.getUriFor(
                    Settings.System.ACCELEROMETER_ROTATION), false, this,
                    UserHandle.USER_ALL);
            resolver.registerContentObserver(Settings.System.getUriFor(
                    Settings.System.USER_ROTATION), false, this,
                    UserHandle.USER_ALL);
            resolver.registerContentObserver(Settings.System.getUriFor(
                    Settings.System.SCREEN_OFF_TIMEOUT), false, this,
                    UserHandle.USER_ALL);
            resolver.registerContentObserver(Settings.System.getUriFor(
                    Settings.System.POINTER_LOCATION), false, this,
                    UserHandle.USER_ALL);
            resolver.registerContentObserver(Settings.Secure.getUriFor(
                    Settings.Secure.DEFAULT_INPUT_METHOD), false, this,
                    UserHandle.USER_ALL);
            resolver.registerContentObserver(Settings.Secure.getUriFor(
                    Settings.Secure.IMMERSIVE_MODE_CONFIRMATIONS), false, this,
                    UserHandle.USER_ALL);
            resolver.registerContentObserver(Settings.Global.getUriFor(
                    Settings.Global.POLICY_CONTROL), false, this,
                    UserHandle.USER_ALL);
            updateSettings();
        }

        @Override public void onChange(boolean selfChange) {
            updateSettings();
            updateRotation(false);
        }
    }

    class MyWakeGestureListener extends WakeGestureListener {
        MyWakeGestureListener(Context context, Handler handler) {
            super(context, handler);
        }

        @Override
        public void onWakeUp() {
            synchronized (mLock) {
                if (shouldEnableWakeGestureLp()) {
                    performHapticFeedbackLw(null, HapticFeedbackConstants.VIRTUAL_KEY, false);
                    mPowerManager.wakeUp(SystemClock.uptimeMillis());
                }
            }
        }
    }

    class MyOrientationListener extends WindowOrientationListener {
        MyOrientationListener(Context context, Handler handler) {
            super(context, handler);
        }

        @Override
        public void onProposedRotationChanged(int rotation) {
            if (localLOGV) Slog.v(TAG, "onProposedRotationChanged, rotation=" + rotation);
            updateRotation(false);
        }
    }
    MyOrientationListener mOrientationListener;

    private final BarController mStatusBarController = new BarController("StatusBar",
            View.STATUS_BAR_TRANSIENT,
            View.STATUS_BAR_UNHIDE,
            View.STATUS_BAR_TRANSLUCENT,
            StatusBarManager.WINDOW_STATUS_BAR,
            WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);

    private final BarController mNavigationBarController = new BarController("NavigationBar",
            View.NAVIGATION_BAR_TRANSIENT,
            View.NAVIGATION_BAR_UNHIDE,
            View.NAVIGATION_BAR_TRANSLUCENT,
            StatusBarManager.WINDOW_NAVIGATION_BAR,
            WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);

    private ImmersiveModeConfirmation mImmersiveModeConfirmation;

    private SystemGesturesPointerEventListener mSystemGestures;

    IStatusBarService getStatusBarService() {
        synchronized (mServiceAquireLock) {
            if (mStatusBarService == null) {
                mStatusBarService = IStatusBarService.Stub.asInterface(
                        ServiceManager.getService("statusbar"));
            }
            return mStatusBarService;
        }
    }

    /*
     * We always let the sensor be switched on by default except when
     * the user has explicitly disabled sensor based rotation or when the
     * screen is switched off.
     */
    boolean needSensorRunningLp() {
        if (mSupportAutoRotation) {
            if (mCurrentAppOrientation == ActivityInfo.SCREEN_ORIENTATION_SENSOR
                    || mCurrentAppOrientation == ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR
                    || mCurrentAppOrientation == ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT
                    || mCurrentAppOrientation == ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE) {
                // If the application has explicitly requested to follow the
                // orientation, then we need to turn the sensor on.
                return true;
            }
        }
        if ((mCarDockEnablesAccelerometer && mDockMode == Intent.EXTRA_DOCK_STATE_CAR) ||
                (mDeskDockEnablesAccelerometer && (mDockMode == Intent.EXTRA_DOCK_STATE_DESK
                        || mDockMode == Intent.EXTRA_DOCK_STATE_LE_DESK
                        || mDockMode == Intent.EXTRA_DOCK_STATE_HE_DESK))) {
            // enable accelerometer if we are docked in a dock that enables accelerometer
            // orientation management,
            return true;
        }
        if (mUserRotationMode == USER_ROTATION_LOCKED) {
            // If the setting for using the sensor by default is enabled, then
            // we will always leave it on.  Note that the user could go to
            // a window that forces an orientation that does not use the
            // sensor and in theory we could turn it off... however, when next
            // turning it on we won't have a good value for the current
            // orientation for a little bit, which can cause orientation
            // changes to lag, so we'd like to keep it always on.  (It will
            // still be turned off when the screen is off.)
            return false;
        }
        return mSupportAutoRotation;
    }

    /*
     * Various use cases for invoking this function
     * screen turning off, should always disable listeners if already enabled
     * screen turned on and current app has sensor based orientation, enable listeners
     * if not already enabled
     * screen turned on and current app does not have sensor orientation, disable listeners if
     * already enabled
     * screen turning on and current app has sensor based orientation, enable listeners if needed
     * screen turning on and current app has nosensor based orientation, do nothing
     */
    void updateOrientationListenerLp() {
        if (!mOrientationListener.canDetectOrientation()) {
            // If sensor is turned off or nonexistent for some reason
            return;
        }
        //Could have been invoked due to screen turning on or off or
        //change of the currently visible window's orientation
        if (localLOGV) Slog.v(TAG, "mScreenOnEarly=" + mScreenOnEarly
                + ", mAwake=" + mAwake + ", mCurrentAppOrientation=" + mCurrentAppOrientation
                + ", mOrientationSensorEnabled=" + mOrientationSensorEnabled);
        boolean disable = true;
        if (mScreenOnEarly && mAwake) {
            if (needSensorRunningLp()) {
                disable = false;
                //enable listener if not already enabled
                if (!mOrientationSensorEnabled) {
                    mOrientationListener.enable();
                    if(localLOGV) Slog.v(TAG, "Enabling listeners");
                    mOrientationSensorEnabled = true;
                }
            }
        }
        //check if sensors need to be disabled
        if (disable && mOrientationSensorEnabled) {
            mOrientationListener.disable();
            if(localLOGV) Slog.v(TAG, "Disabling listeners");
            mOrientationSensorEnabled = false;
        }
    }

    private void interceptPowerKeyDown(boolean handled) {
        mPowerKeyHandled = handled;
        if (!handled) {
            mHandler.postDelayed(mPowerLongPress,
                    ViewConfiguration.get(mContext).getDeviceGlobalActionKeyTimeout());
        }
    }

    private boolean interceptPowerKeyUp(boolean canceled) {
        if (!mPowerKeyHandled) {
            mHandler.removeCallbacks(mPowerLongPress);
            return !canceled;
        }
        return false;
    }

    private void cancelPendingPowerKeyAction() {
        if (!mPowerKeyHandled) {
            mHandler.removeCallbacks(mPowerLongPress);
        }
        if (mPowerKeyTriggered) {
            mPendingPowerKeyUpCanceled = true;
        }
    }

    private void interceptScreenshotChord() {
        if (mScreenshotChordEnabled
                && mVolumeDownKeyTriggered && mPowerKeyTriggered && !mVolumeUpKeyTriggered) {
            final long now = SystemClock.uptimeMillis();
            if (now <= mVolumeDownKeyTime + SCREENSHOT_CHORD_DEBOUNCE_DELAY_MILLIS
                    && now <= mPowerKeyTime + SCREENSHOT_CHORD_DEBOUNCE_DELAY_MILLIS) {
                mVolumeDownKeyConsumedByScreenshotChord = true;
                cancelPendingPowerKeyAction();

                mHandler.postDelayed(mScreenshotRunnable, getScreenshotChordLongPressDelay());
            }
        }
    }

    private long getScreenshotChordLongPressDelay() {
        if (mKeyguardDelegate.isShowing()) {
            // Double the time it takes to take a screenshot from the keyguard
            return (long) (KEYGUARD_SCREENSHOT_CHORD_DELAY_MULTIPLIER *
                    ViewConfiguration.get(mContext).getDeviceGlobalActionKeyTimeout());
        }
        return ViewConfiguration.get(mContext).getDeviceGlobalActionKeyTimeout();
    }

    private void cancelPendingScreenshotChordAction() {
        mHandler.removeCallbacks(mScreenshotRunnable);
    }

    private void powerShortPress(long eventTime) {
        if (mShortPressOnPowerBehavior < 0) {
            mShortPressOnPowerBehavior = mContext.getResources().getInteger(
                    com.android.internal.R.integer.config_shortPressOnPowerBehavior);
        }

        switch (mShortPressOnPowerBehavior) {
            case SHORT_PRESS_POWER_NOTHING:
                break;
            case SHORT_PRESS_POWER_GO_TO_SLEEP:
                mPowerManager.goToSleep(eventTime,
                        PowerManager.GO_TO_SLEEP_REASON_POWER_BUTTON, 0);
                break;
            case SHORT_PRESS_POWER_REALLY_GO_TO_SLEEP:
                mPowerManager.goToSleep(eventTime,
                        PowerManager.GO_TO_SLEEP_REASON_POWER_BUTTON,
                        PowerManager.GO_TO_SLEEP_FLAG_NO_DOZE);
                break;
            case SHORT_PRESS_POWER_REALLY_GO_TO_SLEEP_AND_GO_HOME:
                mPowerManager.goToSleep(eventTime,
                        PowerManager.GO_TO_SLEEP_REASON_POWER_BUTTON,
                        PowerManager.GO_TO_SLEEP_FLAG_NO_DOZE);
                launchHomeFromHotKey();
                break;
        }
    }

    private final Runnable mPowerLongPress = new Runnable() {
        @Override
        public void run() {
            // The context isn't read
            if (mLongPressOnPowerBehavior < 0) {
                mLongPressOnPowerBehavior = mContext.getResources().getInteger(
                        com.android.internal.R.integer.config_longPressOnPowerBehavior);
            }
            int resolvedBehavior = mLongPressOnPowerBehavior;
            if (FactoryTest.isLongPressOnPowerOffEnabled()) {
                resolvedBehavior = LONG_PRESS_POWER_SHUT_OFF_NO_CONFIRM;
            }

            switch (resolvedBehavior) {
            case LONG_PRESS_POWER_NOTHING:
                break;
            case LONG_PRESS_POWER_GLOBAL_ACTIONS:
                mPowerKeyHandled = true;
                if (!performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false)) {
                    performAuditoryFeedbackForAccessibilityIfNeed();
                }
                showGlobalActionsInternal();
                break;
            case LONG_PRESS_POWER_SHUT_OFF:
            case LONG_PRESS_POWER_SHUT_OFF_NO_CONFIRM:
                mPowerKeyHandled = true;
                performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false);
                sendCloseSystemWindows(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS);
                mWindowManagerFuncs.shutdown(resolvedBehavior == LONG_PRESS_POWER_SHUT_OFF);
                break;
            }
        }
    };

    private final Runnable mScreenshotRunnable = new Runnable() {
        @Override
        public void run() {
            takeScreenshot();
        }
    };

    @Override
    public void showGlobalActions() {
        mHandler.removeMessages(MSG_DISPATCH_SHOW_GLOBAL_ACTIONS);
        mHandler.sendEmptyMessage(MSG_DISPATCH_SHOW_GLOBAL_ACTIONS);
    }

    void showGlobalActionsInternal() {
        sendCloseSystemWindows(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS);
        if (mGlobalActions == null) {
            mGlobalActions = new GlobalActions(mContext, mWindowManagerFuncs);
        }
        final boolean keyguardShowing = keyguardIsShowingTq();
        mGlobalActions.showDialog(keyguardShowing, isDeviceProvisioned());
        if (keyguardShowing) {
            // since it took two seconds of long press to bring this up,
            // poke the wake lock so they have some time to see the dialog.
            mPowerManager.userActivity(SystemClock.uptimeMillis(), false);
        }
    }

    boolean isDeviceProvisioned() {
        return Settings.Global.getInt(
                mContext.getContentResolver(), Settings.Global.DEVICE_PROVISIONED, 0) != 0;
    }

    boolean isUserSetupComplete() {
        return Settings.Secure.getIntForUser(mContext.getContentResolver(),
                Settings.Secure.USER_SETUP_COMPLETE, 0, UserHandle.USER_CURRENT) != 0;
    }

    private void handleLongPressOnHome() {
        if (mLongPressOnHomeBehavior != LONG_PRESS_HOME_NOTHING) {
            mHomeConsumed = true;
            performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false);

            if (mLongPressOnHomeBehavior == LONG_PRESS_HOME_RECENT_SYSTEM_UI) {
                toggleRecentApps();
            } else if (mLongPressOnHomeBehavior == LONG_PRESS_HOME_ASSIST) {
                launchAssistAction();
            }
        }
    }

    private void handleDoubleTapOnHome() {
        if (mDoubleTapOnHomeBehavior == DOUBLE_TAP_HOME_RECENT_SYSTEM_UI) {
            mHomeConsumed = true;
            toggleRecentApps();
        }
    }

    private final Runnable mHomeDoubleTapTimeoutRunnable = new Runnable() {
        @Override
        public void run() {
            if (mHomeDoubleTapPending) {
                mHomeDoubleTapPending = false;
                launchHomeFromHotKey();
            }
        }
    };

    /** {@inheritDoc} */
    @Override
    public void init(Context context, IWindowManager windowManager,
            WindowManagerFuncs windowManagerFuncs) {
        mContext = context;
        mWindowManager = windowManager;
        mWindowManagerFuncs = windowManagerFuncs;
        mWindowManagerInternal = LocalServices.getService(WindowManagerInternal.class);
        mDreamManagerInternal = LocalServices.getService(DreamManagerInternal.class);

        mHandler = new PolicyHandler();
        mWakeGestureListener = new MyWakeGestureListener(mContext, mHandler);
        mOrientationListener = new MyOrientationListener(mContext, mHandler);
        try {
            mOrientationListener.setCurrentRotation(windowManager.getRotation());
        } catch (RemoteException ex) { }
        mSettingsObserver = new SettingsObserver(mHandler);
        mSettingsObserver.observe();
        mShortcutManager = new ShortcutManager(context, mHandler);
        mShortcutManager.observe();
        mUiMode = context.getResources().getInteger(
                com.android.internal.R.integer.config_defaultUiModeType);
        mHomeIntent =  new Intent(Intent.ACTION_MAIN, null);
        mHomeIntent.addCategory(Intent.CATEGORY_HOME);
        mHomeIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
        mCarDockIntent =  new Intent(Intent.ACTION_MAIN, null);
        mCarDockIntent.addCategory(Intent.CATEGORY_CAR_DOCK);
        mCarDockIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
        mDeskDockIntent =  new Intent(Intent.ACTION_MAIN, null);
        mDeskDockIntent.addCategory(Intent.CATEGORY_DESK_DOCK);
        mDeskDockIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
                | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

        mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
        mBroadcastWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
                "PhoneWindowManager.mBroadcastWakeLock");
        mEnableShiftMenuBugReports = "1".equals(SystemProperties.get("ro.debuggable"));
        mSupportAutoRotation = mContext.getResources().getBoolean(
                com.android.internal.R.bool.config_supportAutoRotation);
        mLidOpenRotation = readRotation(
                com.android.internal.R.integer.config_lidOpenRotation);
        mCarDockRotation = readRotation(
                com.android.internal.R.integer.config_carDockRotation);
        mDeskDockRotation = readRotation(
                com.android.internal.R.integer.config_deskDockRotation);
        mUndockedHdmiRotation = readRotation(
                com.android.internal.R.integer.config_undockedHdmiRotation);
        mCarDockEnablesAccelerometer = mContext.getResources().getBoolean(
                com.android.internal.R.bool.config_carDockEnablesAccelerometer);
        mDeskDockEnablesAccelerometer = mContext.getResources().getBoolean(
                com.android.internal.R.bool.config_deskDockEnablesAccelerometer);
        mLidKeyboardAccessibility = mContext.getResources().getInteger(
                com.android.internal.R.integer.config_lidKeyboardAccessibility);
        mLidNavigationAccessibility = mContext.getResources().getInteger(
                com.android.internal.R.integer.config_lidNavigationAccessibility);
        mLidControlsSleep = mContext.getResources().getBoolean(
                com.android.internal.R.bool.config_lidControlsSleep);
        mTranslucentDecorEnabled = mContext.getResources().getBoolean(
                com.android.internal.R.bool.config_enableTranslucentDecor);
        readConfigurationDependentBehaviors();

        mAccessibilityManager = (AccessibilityManager) context.getSystemService(
                Context.ACCESSIBILITY_SERVICE);

        // register for dock events
        IntentFilter filter = new IntentFilter();
        filter.addAction(UiModeManager.ACTION_ENTER_CAR_MODE);
        filter.addAction(UiModeManager.ACTION_EXIT_CAR_MODE);
        filter.addAction(UiModeManager.ACTION_ENTER_DESK_MODE);
        filter.addAction(UiModeManager.ACTION_EXIT_DESK_MODE);
        filter.addAction(Intent.ACTION_DOCK_EVENT);
        Intent intent = context.registerReceiver(mDockReceiver, filter);
        if (intent != null) {
            // Retrieve current sticky dock event broadcast.
            mDockMode = intent.getIntExtra(Intent.EXTRA_DOCK_STATE,
                    Intent.EXTRA_DOCK_STATE_UNDOCKED);
        }

        // register for dream-related broadcasts
        filter = new IntentFilter();
        filter.addAction(Intent.ACTION_DREAMING_STARTED);
        filter.addAction(Intent.ACTION_DREAMING_STOPPED);
        context.registerReceiver(mDreamReceiver, filter);

        // register for multiuser-relevant broadcasts
        filter = new IntentFilter(Intent.ACTION_USER_SWITCHED);
        context.registerReceiver(mMultiuserReceiver, filter);

        // monitor for system gestures
        mSystemGestures = new SystemGesturesPointerEventListener(context,
                new SystemGesturesPointerEventListener.Callbacks() {
                    @Override
                    public void onSwipeFromTop() {
                        if (mStatusBar != null) {
                            requestTransientBars(mStatusBar);
                        }
                    }
                    @Override
                    public void onSwipeFromBottom() {
                        if (mNavigationBar != null && mNavigationBarOnBottom) {
                            requestTransientBars(mNavigationBar);
                        }
                    }
                    @Override
                    public void onSwipeFromRight() {
                        if (mNavigationBar != null && !mNavigationBarOnBottom) {
                            requestTransientBars(mNavigationBar);
                        }
                    }
                    @Override
                    public void onDebug() {
                        // no-op
                    }
                });
        mImmersiveModeConfirmation = new ImmersiveModeConfirmation(mContext);
        mWindowManagerFuncs.registerPointerEventListener(mSystemGestures);

        mVibrator = (Vibrator)context.getSystemService(Context.VIBRATOR_SERVICE);
        mLongPressVibePattern = getLongIntArray(mContext.getResources(),
                com.android.internal.R.array.config_longPressVibePattern);
        mVirtualKeyVibePattern = getLongIntArray(mContext.getResources(),
                com.android.internal.R.array.config_virtualKeyVibePattern);
        mKeyboardTapVibePattern = getLongIntArray(mContext.getResources(),
                com.android.internal.R.array.config_keyboardTapVibePattern);
        mClockTickVibePattern = getLongIntArray(mContext.getResources(),
                com.android.internal.R.array.config_clockTickVibePattern);
        mCalendarDateVibePattern = getLongIntArray(mContext.getResources(),
                com.android.internal.R.array.config_calendarDateVibePattern);
        mSafeModeDisabledVibePattern = getLongIntArray(mContext.getResources(),
                com.android.internal.R.array.config_safeModeDisabledVibePattern);
        mSafeModeEnabledVibePattern = getLongIntArray(mContext.getResources(),
                com.android.internal.R.array.config_safeModeEnabledVibePattern);

        mScreenshotChordEnabled = mContext.getResources().getBoolean(
                com.android.internal.R.bool.config_enableScreenshotChord);

        mGlobalKeyManager = new GlobalKeyManager(mContext);

        // Controls rotation and the like.
        initializeHdmiState();

        // Match current screen state.
        if (!mPowerManager.isInteractive()) {
            goingToSleep(WindowManagerPolicy.OFF_BECAUSE_OF_USER);
        }
    }

    /**
     * Read values from config.xml that may be overridden depending on
     * the configuration of the device.
     * eg. Disable long press on home goes to recents on sw600dp.
     */
    private void readConfigurationDependentBehaviors() {
        mLongPressOnHomeBehavior = mContext.getResources().getInteger(
                com.android.internal.R.integer.config_longPressOnHomeBehavior);
        if (mLongPressOnHomeBehavior < LONG_PRESS_HOME_NOTHING ||
                mLongPressOnHomeBehavior > LONG_PRESS_HOME_ASSIST) {
            mLongPressOnHomeBehavior = LONG_PRESS_HOME_NOTHING;
        }

        mDoubleTapOnHomeBehavior = mContext.getResources().getInteger(
                com.android.internal.R.integer.config_doubleTapOnHomeBehavior);
        if (mDoubleTapOnHomeBehavior < DOUBLE_TAP_HOME_NOTHING ||
                mDoubleTapOnHomeBehavior > DOUBLE_TAP_HOME_RECENT_SYSTEM_UI) {
            mDoubleTapOnHomeBehavior = LONG_PRESS_HOME_NOTHING;
        }
    }

    @Override
    public void setInitialDisplaySize(Display display, int width, int height, int density) {
        // This method might be called before the policy has been fully initialized
        // or for other displays we don't care about.
        if (mContext == null || display.getDisplayId() != Display.DEFAULT_DISPLAY) {
            return;
        }
        mDisplay = display;

        final Resources res = mContext.getResources();
        int shortSize, longSize;
        if (width > height) {
            shortSize = height;
            longSize = width;
            mLandscapeRotation = Surface.ROTATION_0;
            mSeascapeRotation = Surface.ROTATION_180;
            if (res.getBoolean(com.android.internal.R.bool.config_reverseDefaultRotation)) {
                mPortraitRotation = Surface.ROTATION_90;
                mUpsideDownRotation = Surface.ROTATION_270;
            } else {
                mPortraitRotation = Surface.ROTATION_270;
                mUpsideDownRotation = Surface.ROTATION_90;
            }
        } else {
            shortSize = width;
            longSize = height;
            mPortraitRotation = Surface.ROTATION_0;
            mUpsideDownRotation = Surface.ROTATION_180;
            if (res.getBoolean(com.android.internal.R.bool.config_reverseDefaultRotation)) {
                mLandscapeRotation = Surface.ROTATION_270;
                mSeascapeRotation = Surface.ROTATION_90;
            } else {
                mLandscapeRotation = Surface.ROTATION_90;
                mSeascapeRotation = Surface.ROTATION_270;
            }
        }

        mStatusBarHeight =
                res.getDimensionPixelSize(com.android.internal.R.dimen.status_bar_height);

        // Height of the navigation bar when presented horizontally at bottom
        mNavigationBarHeightForRotation[mPortraitRotation] =
        mNavigationBarHeightForRotation[mUpsideDownRotation] =
                res.getDimensionPixelSize(com.android.internal.R.dimen.navigation_bar_height);
        mNavigationBarHeightForRotation[mLandscapeRotation] =
        mNavigationBarHeightForRotation[mSeascapeRotation] = res.getDimensionPixelSize(
                com.android.internal.R.dimen.navigation_bar_height_landscape);

        // Width of the navigation bar when presented vertically along one side
        mNavigationBarWidthForRotation[mPortraitRotation] =
        mNavigationBarWidthForRotation[mUpsideDownRotation] =
        mNavigationBarWidthForRotation[mLandscapeRotation] =
        mNavigationBarWidthForRotation[mSeascapeRotation] =
                res.getDimensionPixelSize(com.android.internal.R.dimen.navigation_bar_width);

        // SystemUI (status bar) layout policy
        int shortSizeDp = shortSize * DisplayMetrics.DENSITY_DEFAULT / density;
        int longSizeDp = longSize * DisplayMetrics.DENSITY_DEFAULT / density;


        // {{
        //FriendlyARM LCD List:
        // W35/H43/P35/P43/PA43/PB43/S70/S700/S702/HD700/HD101/W101
        String lcd = SystemProperties.get("ro.sf.lcd_name", "unknow");
        if (lcd.equalsIgnoreCase("S70") 
            || lcd.equalsIgnoreCase("S700") 
            || lcd.equalsIgnoreCase("S702")
            ) {
            mNavigationBarCanMove = false;
            mHasNavigationBar = true;
        } else {
            // Allow the navigation bar to move on small devices (phones).
            mNavigationBarCanMove = shortSizeDp < 600;
            
            // original source code:
            mHasNavigationBar = res.getBoolean(com.android.internal.R.bool.config_showNavigationBar);
            // Allow a system property to override this. Used by the emulator.
            // See also hasNavigationBar().

            String navBarOverride = SystemProperties.get("qemu.hw.mainkeys");
            if ("1".equals(navBarOverride)) {
                mHasNavigationBar = false;
            } else if ("0".equals(navBarOverride)) {
                mHasNavigationBar = true;
            }
        }
        //}}

        // For demo purposes, allow the rotation of the HDMI display to be controlled.
        // By default, HDMI locks rotation to landscape.
        if ("portrait".equals(SystemProperties.get("persist.demo.hdmirotation"))) {
            mDemoHdmiRotation = mPortraitRotation;
        } else {
            mDemoHdmiRotation = mLandscapeRotation;
        }
        mDemoHdmiRotationLock = SystemProperties.getBoolean("persist.demo.hdmirotationlock", false);

        // Only force the default orientation if the screen is xlarge, at least 960dp x 720dp, per
        // http://developer.android.com/guide/practices/screens_support.html#range
        mForceDefaultOrientation = longSizeDp >= 960 && shortSizeDp >= 720 &&
                res.getBoolean(com.android.internal.R.bool.config_forceDefaultOrientation) &&
                // For debug purposes the next line turns this feature off with:
                // $ adb shell setprop config.override_forced_orient true
                // $ adb shell wm size reset
                !"true".equals(SystemProperties.get("config.override_forced_orient"));
    }

    /**
     * @return whether the navigation bar can be hidden, e.g. the device has a
     *         navigation bar and touch exploration is not enabled
     */
    private boolean canHideNavigationBar() {
        return mHasNavigationBar
                && !mAccessibilityManager.isTouchExplorationEnabled();
    }

    @Override
    public boolean isDefaultOrientationForced() {
        return mForceDefaultOrientation;
    }

    @Override
    public void setDisplayOverscan(Display display, int left, int top, int right, int bottom) {
        if (display.getDisplayId() == Display.DEFAULT_DISPLAY) {
            mOverscanLeft = left;
            mOverscanTop = top;
            mOverscanRight = right;
            mOverscanBottom = bottom;
        }
    }

    public void updateSettings() {
        ContentResolver resolver = mContext.getContentResolver();
        boolean updateRotation = false;
        synchronized (mLock) {
            mEndcallBehavior = Settings.System.getIntForUser(resolver,
                    Settings.System.END_BUTTON_BEHAVIOR,
                    Settings.System.END_BUTTON_BEHAVIOR_DEFAULT,
                    UserHandle.USER_CURRENT);
            mIncallPowerBehavior = Settings.Secure.getIntForUser(resolver,
                    Settings.Secure.INCALL_POWER_BUTTON_BEHAVIOR,
                    Settings.Secure.INCALL_POWER_BUTTON_BEHAVIOR_DEFAULT,
                    UserHandle.USER_CURRENT);

            // Configure wake gesture.
            boolean wakeGestureEnabledSetting = Settings.Secure.getIntForUser(resolver,
                    Settings.Secure.WAKE_GESTURE_ENABLED, 0,
                    UserHandle.USER_CURRENT) != 0;
            if (mWakeGestureEnabledSetting != wakeGestureEnabledSetting) {
                mWakeGestureEnabledSetting = wakeGestureEnabledSetting;
                updateWakeGestureListenerLp();
            }

            // Configure rotation lock.
            int userRotation = Settings.System.getIntForUser(resolver,
                    Settings.System.USER_ROTATION, Surface.ROTATION_0,
                    UserHandle.USER_CURRENT);
            if (mUserRotation != userRotation) {
                mUserRotation = userRotation;
                updateRotation = true;
            }
            int userRotationMode = Settings.System.getIntForUser(resolver,
                    Settings.System.ACCELEROMETER_ROTATION, 0, UserHandle.USER_CURRENT) != 0 ?
                            WindowManagerPolicy.USER_ROTATION_FREE :
                                    WindowManagerPolicy.USER_ROTATION_LOCKED;
            if (mUserRotationMode != userRotationMode) {
                mUserRotationMode = userRotationMode;
                updateRotation = true;
                updateOrientationListenerLp();
            }