让Android不播放关机动画，而是显示一个关机进度条的方法

修改文件:
frameworks/base/core/java/com/android/internal/app/ShutdownThread.java
synchronized (mEnableAnimatingSync) {          if(!mEnableAnimating){            sInstance.mPowerManager.setBacklightBrightness(Power.BRIGHTNESS_DIM);        } else {        //add by bcf,将播放动画的BOOLEAN值设置为假，就不播放动画了，而是显示一个进度条+正在关机的字样        mShutOffAnimation=false;           //add end          if (mShutOffAnimation) {                boolean isRotaionEnabled = false;                   try {                    isRotaionEnabled = Settings.System.getInt(sInstance.mContext.getContentResolver(),                             Settings.System.ACCELEROMETER_ROTATION, 1) != 0;                    if (isRotaionEnabled) {                        Settings.System.putInt(sInstance.mContext.getContentResolver(),                                Settings.System.ACCELEROMETER_ROTATION, 0);                        Settings.System.putInt(sInstance.mContext.getContentResolver(),                                 Settings.System.ACCELEROMETER_ROTATION_RESTORE, 1);                    }                } catch (NullPointerException ex) {                    Log.e(TAG, "check Rotation: sInstance.mContext object is null when get Rotation");                                  }                           beginAnimationTime = SystemClock.elapsedRealtime() + MIN_SHUTDOWN_ANIMATION_PLAY_TIME;                 // +MediaTek 2012-02-25 Disable key dispatch                try {                    final IWindowManager wm = IWindowManager.Stub.asInterface(                            ServiceManager.getService(Context.WINDOW_SERVICE));                    wm.setEventDispatching(false);                } catch (RemoteException e) {}                // -MediaTek 2012-02-25 Disable key dispatch                                              startBootAnimation();            } else {                pd = new ProgressDialog(context);                 pd.setTitle(context.getText(com.android.internal.R.string.power_off));                pd.setMessage(context.getText(com.android.internal.R.string.shutdown_progress));                pd.setIndeterminate(true);                pd.setCancelable(false);                pd.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);                /* To fix video+UI+blur flick issue */                pd.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);                pd.show();            }            /* set screen brightness off after shutdownThread start */            sInstance.mHandler.postDelayed(mDelayDim, screen_turn_off_time);         }   }
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