Platform: ROCKCHIP
OS: Android 6.0
Kernel: 3.10.92

預設user版本不顯示開發者選項這一欄,需要通過連續點選版本號7次來顯示.
packages\apps\Settings\src\com\android\settings\DeviceInfoSettings.java

static final int TAPS_TO_BE_A_DEVELOPER = 7;

public void onResume() {
    super.onResume();
    mDevHitCountdown = getActivity().getSharedPreferences(DevelopmentSettings.PREF_FILE,
            Context.MODE_PRIVATE).getBoolean(DevelopmentSettings.PREF_SHOW,
                    android.os.Build.TYPE.equals("eng")) ? -1 : TAPS_TO_BE_A_DEVELOPER;
    mDevHitToast = null;
}

 public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
 ......
     if (mDevHitCountdown > 0) {
        mDevHitCountdown--;
        if (mDevHitCountdown == 0) {
            getActivity().getSharedPreferences(DevelopmentSettings.PREF_FILE,
                    Context.MODE_PRIVATE).edit().putBoolean(
                            DevelopmentSettings.PREF_SHOW, true).apply();
            if (mDevHitToast != null) {
                mDevHitToast.cancel();
            }
            mDevHitToast = Toast.makeText(getActivity(), R.string.show_dev_on,
                    Toast.LENGTH_LONG);
            mDevHitToast.show();
            // This is good time to index the Developer Options
            Index.getInstance(
                    getActivity().getApplicationContext()).updateFromClassNameResource(
                            DevelopmentSettings.class.getName(), true, true);

        } else if (mDevHitCountdown > 0
                && mDevHitCountdown < (TAPS_TO_BE_A_DEVELOPER-2)) {
            if (mDevHitToast != null) {
                mDevHitToast.cancel();
            }
            mDevHitToast = Toast.makeText(getActivity(), getResources().getQuantityString(
                    R.plurals.show_dev_countdown, mDevHitCountdown, mDevHitCountdown),
                    Toast.LENGTH_SHORT);
            mDevHitToast.show();
        }
        } else if (mDevHitCountdown < 0) { //點選完7次之後顯示
            if (mDevHitToast != null) {
                mDevHitToast.cancel();
            }
            mDevHitToast = Toast.makeText(getActivity(), R.string.show_dev_already,
                    Toast.LENGTH_LONG);
            mDevHitToast.show();
        }
    }
......
}
 

而預設開機是否顯示由變數showDev控制
packages\apps\Settings\src\com\android\settings\SettingsActivity.java

private void updateTilesList(List<DashboardCategory> target) {
    final boolean showDev = mDevelopmentPreferences.getBoolean(
            DevelopmentSettings.PREF_SHOW,
            android.os.Build.TYPE.equals("eng"));    //因此eng才返回true
......
    } else if (id == R.id.development_settings) {
        if (!showDev || um.hasUserRestriction(
                UserManager.DISALLOW_DEBUGGING_FEATURES)) {
            removeTile = true;    //showDev為false則不顯示
        }
    }
}
 

解決方法:
diff --git a/src/com/android/settings/SettingsActivity.java b/src/com/android/settings/SettingsActivity.java
index 645add3..11a9c55 100755
--- a/src/com/android/settings/SettingsActivity.java
+++ b/src/com/android/settings/SettingsActivity.java
@@ -1236,9 +1236,11 @@ public class SettingsActivity extends Activity
     }
 
     private void updateTilesList(List<DashboardCategory> target) {
-        final boolean showDev = mDevelopmentPreferences.getBoolean(
-                DevelopmentSettings.PREF_SHOW,
-                android.os.Build.TYPE.equals("eng"));
+       /*Kris, 170413, show development options anytime.*/
+      //  final boolean showDev = mDevelopmentPreferences.getBoolean(
+           //     DevelopmentSettings.PREF_SHOW,
+                //android.os.Build.TYPE.equals("eng"));
+         final boolean showDev = true;