Runnable mPowerLongPress = new Runnable() {
 public void run() {
  mShouldTurnOffOnKeyUp = false;
  performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false);
  sendCloseSystemWindows(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS);
  showGlobalActionsDialog();
 }
};

調(diào)用showGlobalActionsDialog方法之后將會聚到有“飛行模式”、“靜音”、“關(guān)機”等選項的對話框。

找到這里，我們就知道該做什么了！干掉它，換成我們想要的關(guān)機代碼，就大功告成了！既然這樣，事不宜遲，讓我們趕快到showGloabalActionDialog方法中看看關(guān)機的部分在哪里！

showGlobalActionsDialog的實現(xiàn)部分在這里：
frameworks\policies\base\phone\com\android\internal\policy\impl\GlobalAction.java

public void showDialog(boolean keyguardShowing, boolean isDeviceProvisioned) {
 mKeyguardShowing = keyguardShowing; 
 mDeviceProvisioned = isDeviceProvisioned; 
 if (mDialog == null) {
  mStatusBar = (StatusBarManager)mContext.getSystemService(Context.STATUS_BAR_SERVICE);
  mDialog = createDialog();
 } 
 prepareDialog(); 
 mStatusBar.disable(StatusBarManager.DISABLE_EXPAND);
 mDialog.show(); 
}

我們可以很清楚的看到，這里新建了一個mDialog，然后prepare接著就show了它，那么，這個mDialog就是關(guān)鍵了，看看它是怎么被createDialog創(chuàng)建出來的吧，仍然在這個文件中：

/** 
 * Create the global actions dialog. 
 * @return A new dialog. 
 */ 
private AlertDialog createDialog() { 
 mSilentModeToggle = new ToggleAction( 
   R.drawable.ic_lock_silent_mode, 
   R.drawable.ic_lock_silent_mode_off, 
   R.string.global_action_toggle_silent_mode, 
   R.string.global_action_silent_mode_on_status, 
   R.string.global_action_silent_mode_off_status) { 
  void willCreate() { 
   // XXX: FIXME: switch to ic_lock_vibrate_mode when available 
   mEnabledIconResId = (Settings.System.getInt(mContext.getContentResolver(), 
     Settings.System.VIBRATE_IN_SILENT, 1) == 1) 
    ? R.drawable.ic_lock_silent_mode_vibrate 
    : R.drawable.ic_lock_silent_mode; 
  } 
  void onToggle(boolean on) {
   if (on) { 
    mAudioManager.setRingerMode((Settings.System.getInt(mContext.getContentResolver(), 
     Settings.System.VIBRATE_IN_SILENT, 1) == 1) 
     ? AudioManager.RINGER_MODE_VIBRATE 
     : AudioManager.RINGER_MODE_SILENT); 
   } else {
    mAudioManager.setRingerMode(AudioManager.RINGER_MODE_NORMAL);
   } 
  } 
  public boolean showDuringKeyguard() {
   return true; 
  } 
  public boolean showBeforeProvisioning() {
   return false; 
  } 
 };
 mAirplaneModeOn = new ToggleAction( 
   R.drawable.ic_lock_airplane_mode, 
   R.drawable.ic_lock_airplane_mode_off, 
   R.string.global_actions_toggle_airplane_mode, 
   R.string.global_actions_airplane_mode_on_status, 
   R.string.global_actions_airplane_mode_off_status) {
  void onToggle(boolean on) { 
   if (Boolean.parseBoolean( 
     SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))) {
    mIsWaitingForEcmExit = true;
    // Launch ECM exit dialog
    Intent ecmDialogIntent = 
      new Intent(TelephonyIntents.ACTION_SHOW_NOTICE_ECM_BLOCK_OTHERS, null); 
    ecmDialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    mContext.startActivity(ecmDialogIntent);
   } else {
    changeAirplaneModeSystemSetting(on);
   }
  }
  @Override
  protected void changeStateFromPress(boolean buttonOn) {
   // In ECM mode airplane state cannot be changed
   if (!(Boolean.parseBoolean(
     SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE)))) {
    mState = buttonOn ? State.TurningOn : State.TurningOff;
    mAirplaneState = mState;
   }
  }
  public boolean showDuringKeyguard() {
   return true;
  }
  public boolean showBeforeProvisioning() {
   return false;
  }
 };
 <span style="color:#ff0000;">mItems = Lists.newArrayList(
   // silent mode
   mSilentModeToggle,
   // next: airplane mode
   mAirplaneModeOn,
   // last: power off
   new SinglePressAction(
     com.android.internal.R.drawable.ic_lock_power_off,
     R.string.global_action_power_off) {
    </span><span style="color:#3333ff;"><u>public void onPress() {
     // shutdown by making sure radio and power are handled accordingly. 
     ShutdownThread.shutdown(mContext, true);
    }</u></span><span style="color:#ff0000;">
    public boolean showDuringKeyguard() {
     return true;
    }
    public boolean showBeforeProvisioning() {
     return true;
    }</span>
   });
 mAdapter = new MyAdapter();
 final AlertDialog.Builder ab = new AlertDialog.Builder(mContext);
 ab.setAdapter(mAdapter, this)
   .setInverseBackgroundForced(true)
   .setTitle(R.string.global_actions);
 final AlertDialog dialog = ab.create();
 dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_DIALOG);
 if (!mContext.getResources().getBoolean(
   com.android.internal.R.bool.config_sf_slowBlur)) {
  dialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND, 
    WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
 }
 dialog.setOnDismissListener(this);
 return dialog;
}

看看我們發(fā)現(xiàn)了什么??！藍色的部分就是關(guān)機調(diào)用的函數(shù)了??！shutdown方法的第二個參數(shù)標(biāo)識是否彈出詢問對話框。你可以選擇需要（true）或者不需要（false）。這里我保守一點，還是選個true吧，萬一不小心按到關(guān)機鍵呢，呵呵。。。

也就是說，只要我們用

復(fù)制代碼代碼如下:

ShutdownThread.shutdown(mContext, true);

替換掉前面的

復(fù)制代碼代碼如下:

showGlobalActionsDialog();

就可以大功告成了！還等什么！我們修改
frameworks\policies\base\phone\com\android\internal\policy\impl\PhoneWindowManager.java
的源代碼如下：

Runnable mPowerLongPress = new Runnable() { 
 public void run() { 
  mShouldTurnOffOnKeyUp = false; 
  performHapticFeedbackLw(null, HapticFeedbackConstants.LONG_PRESS, false); 
  sendCloseSystemWindows(SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS); 
  //showGlobalActionsDialog(); 
  ShutdownThread.shutdown(mContext, true); 
 } 
};

好了，大功告成了??！

是不是就這樣完了呢？發(fā)現(xiàn)編譯不過。。。

細節(jié)很重要?。?/p>

原來ShutdownThread.shutdown(mContext, true)的引用包沒加進來??！幸好有g(shù)cc。。。

復(fù)制代碼代碼如下:

import com.android.internal.app.ShutdownThread;

將上面這個包加到

frameworks\policies\base\phone\com\android\internal\policy\impl\PhoneWindowManager.java

中，再次編譯，通過，YES！

看看我們的戰(zhàn)果吧：