Android开发者模式的选项中有一项叫“停用HW叠加层”，这个选项使能之后，系统所有的UI合成都会全部强制GPU去完成，HWC不再参与合成，需求来源就是默认要使能该功能，即禁用HW叠加，具体实现如下：
diff --git a/src/com/android/settings/FallbackHome.java b/src/com/android/settings/FallbackHome.java index e3944a65c6..5e7e0cae59 --- a/src/com/android/settings/FallbackHome.java +++ b/src/com/android/settings/FallbackHome.java @@ -17,6 +17,7 @@ package com.android.settings; import android.app.Activity; +import android.app.AppGlobals; import android.app.WallpaperColors; import android.app.WallpaperManager; import android.app.WallpaperManager.OnColorsChangedListener; @@ -25,7 +26,12 @@ import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.pm.ResolveInfo; +import android.content.pm.IPackageManager; import android.os.AsyncTask; +import android.os.IBinder; +import android.os.Parcel; +import android.os.RemoteException; +import android.os.ServiceManager; import android.os.Bundle; import android.os.Handler; import android.os.Message; @@ -48,6 +54,13 @@ public class FallbackHome extends Activity { private boolean mProvisioned; private WallpaperManager mWallManager; + private static final int SETTING_VALUE_ON = 1; + private static final String SURFACE_FLINGER_SERVICE_KEY = "SurfaceFlinger"; + private static final String SURFACE_COMPOSER_INTERFACE_KEY = "android.ui.ISurfaceComposer"; + private static final int SURFACE_FLINGER_DISABLE_OVERLAYS_CODE = 1008; + + private static IBinder mSurfaceFlinger; + private final Runnable mProgressTimeoutRunnable = () -> { View v = getLayoutInflater().inflate( R.layout.fallback_home_finishing_boot, null /* root */); @@ -100,10 +113,36 @@ public class FallbackHome extends Activity { } getWindow().getDecorView().setSystemUiVisibility(flags); + if (mSurfaceFlinger == null) { + mSurfaceFlinger = ServiceManager.getService(SURFACE_FLINGER_SERVICE_KEY); + } + + initHardwareOverlaysSetting(SETTING_VALUE_ON); + registerReceiver(mReceiver, new IntentFilter(Intent.ACTION_USER_UNLOCKED)); maybeFinish(); } + public void initHardwareOverlaysSetting(int val) { + if (mSurfaceFlinger == null) { + return; + } + + IPackageManager pm = AppGlobals.getPackageManager(); + // magic communication with surface flinger. + try { + if (pm.isFirstBoot()) { + final Parcel data = Parcel.obtain(); + data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY); + data.writeInt(val); + mSurfaceFlinger.transact(SURFACE_FLINGER_DISABLE_OVERLAYS_CODE, data, null, 0 /* flags */); + data.recycle(); + } + } catch (RemoteException ex) { + // intentional no-op + } + } + @Override protected void onResume() { super.onResume(); 因为开机默认状态，不会加载开发者模式的页面，因此在开发者模式的控制类是无法修改默认的，只能在开机必走的阶段执行使能，这里我选择的是FallbackHome这个类，每次在launcher启动之前都会调用这里，故选择该类。
编译验证，刷机即可发现在开发者选项中，该项值已经默认打开了。
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