Android開發:實現系統自帶截圖功能 需要獲取System許可權
在一個service介面上,點選一個button按鈕,可以截圖
貼上程式碼:
mButton.setOnClickListener(new OnClickListener(){
public void onClick(View arg0) {
capturescreen();
}
});
private void captureScreen ()
{
mHandler.postDelayed(mScreenshotChordLongPress,1000);
}
private final Runnable mScreenshotChordLongPress = new Runnable() {
public void run() {
takeScreenshot();
}
};
final Runnable mScreenshotTimeout = new Runnable() {
public void run() {
synchronized (mScreenshotLock) {
if (mScreenshotConnection != null) {
mContext.unbindService(mScreenshotConnection);
mScreenshotConnection = null;
}
}
}
};
private void takeScreenshot() {
synchronized (mScreenshotLock) {
if (mScreenshotConnection != null) {
return;
}
ComponentName cn = new ComponentName("com.android.systemui",
"com.android.systemui.screenshot.TakeScreenshotService");
Intent intent = new Intent();
intent.setComponent(cn);
ServiceConnection conn = new ServiceConnection() {
public void onServiceConnected(ComponentName name, IBinder service) {
synchronized (mScreenshotLock) {
if (mScreenshotConnection != this) {
return;
}
Messenger messenger = new Messenger(service);
Message msg = Message.obtain(null, 1);
final ServiceConnection myConn = this;
Handler h = new Handler(mHandler.getLooper()) {
@Override
public void handleMessage(Message msg) {
synchronized (mScreenshotLock) {
if (mScreenshotConnection == myConn) {
mContext.unbindService(mScreenshotConnection);
mScreenshotConnection = null;
mHandler.removeCallbacks(mScreenshotTimeout);
}
}
}
};
msg.replyTo = new Messenger(h);
msg.arg1 = msg.arg2 = 0;
// if (mStatusBar != null && mStatusBar.isVisibleLw())
// msg.arg1 = 1;
// if (mNavigationBar != null && mNavigationBar.isVisibleLw())
// msg.arg2 = 1;
try {
messenger.send(msg);
} catch (RemoteException e) {
}
}
}
public void onServiceDisconnected(ComponentName name) {}
};
if (mContext.bindService(intent, conn, Context.BIND_AUTO_CREATE)) {
mScreenshotConnection = conn;
mHandler.postDelayed(mScreenshotTimeout, 10000);
}
}
}
點選button之後會停運,因為呼叫系統截圖的serivce:com.android.systemui.screenshot.TakeScreenshotService
要呼叫此service需要sysytem許可權才能呼叫:
唯有將此應用內建到手機裡面,才能獲取到sysytem許可權:
做法如下:
1.在你自己的程式當中的的mainfest.xml的manifest加上此屬性android:sharedUserId="android.uid.system"
2.內建的時候Android.mk中加上LOCAL_CERTIFICATE := PLATFORM
3.在linux環境下將此應用編譯進去。這樣就能夠實現系統自帶的截圖了