對于Android的的手機或者平板長期使用，感覺會出現慢的情況，所以偶爾還是需要重啟一下，而長按電源鍵彈出的菜單又沒有重啟選項，所以特在此記錄自己添加這個功能的過程。
首先關機的那個彈出菜單是在frameworks/base/policy/src/com/android/internal/policy/impl/GlobalActions.java這個文件中創建的：

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/**

?* Create the global actions dialog.

?* @return A new dialog.

?*/

private?GlobalActionsDialog?createDialog()?{

????// Simple toggle style if there's no vibrator, otherwise use a tri-state

????if?(!mHasVibrator)?{

????????mSilentModeAction?=?new?SilentModeToggleAction();

????}?else?{

????????mSilentModeAction?=?new?SilentModeTriStateAction(mContext,?mAudioManager,?mHandler);

????}

????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?(mHasTelephony?&&?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)?{

????????????if?(!mHasTelephony)?return;

????????????// 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;

????????}

????};

????onAirplaneModeChanged();

????mItems?=?new?ArrayList<Action>();

????// first: power off

????mItems.add(

????????new?SinglePressAction(

????????????????com.android.internal.R.drawable.ic_lock_power_off,

????????????????R.string.global_action_power_off)?{

????????????public?void?onPress()?{

????????????????// shutdown by making sure radio and power are handled accordingly.

????????????????mWindowManagerFuncs.shutdown(true);

????????????}

????????????public?boolean?onLongPress()?{

????????????????mWindowManagerFuncs.rebootSafeMode(true);

????????????????return?true;

????????????}

????????????public?boolean?showDuringKeyguard()?{

????????????????return?true;

????????????}

????????????public?boolean?showBeforeProvisioning()?{

????????????????return?true;

????????????}

????????});

我們可以看到mItems.add函數是添加一個選項，該菜單的第一個選項就是關機選項，我們可以在此之后添加重啟選項，代碼如下：

mItems.add(

????new?SinglePressAction(

????????com.android.internal.R.drawable.ic_lock_power_off,

????????R.string.global_action_reboot)?{?

?????

????????public?void?onPress()?{?

????????????// reboot?

????????????mWindowManagerFuncs.reboot();

????????}?

?????????

????????public?boolean?showDuringKeyguard()?{?

????????????return?true;

????????}?

?????????

????????public?boolean?showBeforeProvisioning()?{?

????????????return?true;?

????????}?

????});

上面的代碼中使用了mWindowManagerFuncs.reboot函數和R.string.global_action_reboot資源，因此我們需要該資源并實現reboot函數。
首先在frameworks/base/core/java/android/view/WindowManagerPolicy.java中添加reboot接口：

/**

?* Interface for calling back in to the window manager that is private

?* between it and the policy.

?*/

public?interface?WindowManagerFuncs?{

????...

????/**

?????* Switch the keyboard layout for the given device.

?????* Direction should be +1 or -1 to go to the next or previous keyboard layout.

?????*/

????public?void?switchKeyboardLayout(int?deviceId,?int?direction);

????public?void?shutdown();

????public?void?reboot();?

????public?void?rebootSafeMode();

}

然后在frameworks/base/services/java/com/android/server/wm/WindowManagerService.java中實現該接口：

// Called by window manager policy. Not exposed externally.

@Override

public?void?shutdown()?{

????ShutdownThread.shutdown(mContext,?true);

}

// Called by window manager policy. Not exposed externally.

@Override

public?void?reboot()?{

????ShutdownThread.reboot(mContext,?null,?true);

}

// Called by window manager policy. Not exposed externally.?

@Override

public?void?rebootSafeMode()?{

????ShutdownThread.rebootSafeMode(mContext,?true);

}

接下來，為了在按下重啟選項之后，能出現”重啟“之類的提示，還需要修改frameworks/base/services/java/com/android/server/pm/ShutdownThread.java中的shutdownInner函數和beginShutdownSequence函數：

static?void?shutdownInner(final?Context?context,?boolean?confirm)?{

????// ensure that only one thread is trying to power down.

????// any additional calls are just returned

????synchronized?(sIsStartedGuard)?{

????????if?(sIsStarted)?{

????????????Log.d(TAG,?"Request to shutdown already running, returning.");

????????????return;

????????}

????}

????final?int?longPressBehavior?=?context.getResources().getInteger(

????????????????????com.android.internal.R.integer.config_longPressOnPowerBehavior);

????final?int?resourceId?=?mRebootSafeMode

??????????????com.android.internal.R.string.reboot_safemode_confirm

????????????:?(longPressBehavior?==?2

??????????????????????com.android.internal.R.string.shutdown_confirm_question

????????????????????:?(mReboot???com.android.internal.R.string.reboot_confirm?:

????????????????????????com.android.internal.R.string.shutdown_confirm));

????Log.d(TAG,?"Notifying thread to start shutdown longPressBehavior="?+?longPressBehavior);

????if?(confirm)?{

????????final?CloseDialogReceiver closer?=?new?CloseDialogReceiver(context);

????????final?AlertDialog?dialog?=?new?AlertDialog.Builder(context)

????????????????.setTitle(mRebootSafeMode

??????????????????????????com.android.internal.R.string.reboot_safemode_title

????????????????????????:?(mReboot???com.android.internal.R.string.reboot?:

????????????????????????????com.android.internal.R.string.power_off))

????????????????.setMessage(resourceId)

????????????????.setPositiveButton(com.android.internal.R.string.yes,?new?DialogInterface.OnClickListener()?{

????????????????????public?void?onClick(DialogInterface?dialog,?int?which)?{

????????????????????????beginShutdownSequence(context);

????????????????????}

????????????????})

????????????????.setNegativeButton(com.android.internal.R.string.no,?null)

????????????????.create();

????????closer.dialog?=?dialog;

????????dialog.setOnDismissListener(closer);

????????dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);

????????dialog.show();

????}?else?{

????????beginShutdownSequence(context);

????}

}

private?static?void?beginShutdownSequence(Context?context)?{

???synchronized?(sIsStartedGuard)?{

???????if?(sIsStarted)?{

???????????Log.d(TAG,?"Shutdown sequence already running, returning.");

???????????return;

???????}

???????sIsStarted?=?true;

???}

???// throw up an indeterminate system dialog to indicate radio is

???// shutting down.

???ProgressDialog 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);

???pd.show();

???sInstance.mContext?=?context;

???sInstance.mPowerManager?=?(PowerManager)context.getSystemService(Context.POWER_SERVICE);

???// make sure we never fall asleep again

???sInstance.mCpuWakeLock?=?null;

???try?{

???????sInstance.mCpuWakeLock?=?sInstance.mPowerManager.newWakeLock(

???????????????PowerManager.PARTIAL_WAKE_LOCK,?TAG?+?"-cpu");

???????sInstance.mCpuWakeLock.setReferenceCounted(false);

???????sInstance.mCpuWakeLock.acquire();

???}?catch?(SecurityException?e)?{

???????Log.w(TAG,?"No permission to acquire wake lock",?e);

???????sInstance.mCpuWakeLock?=?null;

???}

???// also make sure the screen stays on for better user experience

???sInstance.mScreenWakeLock?=?null;

???if?(sInstance.mPowerManager.isScreenOn())?{

???????try?{

???????????sInstance.mScreenWakeLock?=?sInstance.mPowerManager.newWakeLock(

???????????????????PowerManager.FULL_WAKE_LOCK,?TAG?+?"-screen");

???????????sInstance.mScreenWakeLock.setReferenceCounted(false);

???????????sInstance.mScreenWakeLock.acquire();

???????}?catch?(SecurityException?e)?{

???????????Log.w(TAG,?"No permission to acquire wake lock",?e);

???????????sInstance.mScreenWakeLock?=?null;

???????}

???}

???// start the thread that initiates shutdown

???sInstance.mHandler?=?new?Handler()?{

???};

???sInstance.start();

}

至此關于代碼部分的改動全部完成，接下來就需要添加使用到的資源了，就是前面用到的字符串。首先需要在frameworks/base/core/res/res/values/strings.xml中添加一下字符串：

<string name="reboot">Reboot</string>

<string name="reboot_progress">Reboot\u2026</string>

<string name="reboot_confirm"?product="tablet">Your tablet will reboot.</string>

<string name="reboot_confirm"?product="default">Your phone will reboot.</string>

<!-- label for item that reboot in phone options dialog -->

<string name="global_action_reboot">Reboot</string>

而后需要在frameworks/base/core/res/res/values/public.xml中聲明這些資源，否則編譯的時候會出現找不到該資源的錯誤。

<java-symbol type="string"?name="reboot"?/>

<java-symbol type="string"?name="reboot_confirm"?/>

<java-symbol type="string"?name="reboot_progress"?/>

<java-symbol type="string"?name="global_action_reboot"?/>

至此，全部修改完成，編譯燒寫即可。

總結

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