Android 4.1.2系统添加重启功能

转自：http://blog.chinaunix.net/uid-20729605-id-3779071.html

对于Android的的手机或者平板长期使用，感觉会出现慢的情况，所以偶尔还是需要重启一下，而长按电源键弹出的菜单又没有重启选项，所以特在此记录自己添加这个功能的过程。

首先关机的那个弹出菜单是在frameworks/base/policy/src/com/android/internal/policy/impl/GlobalActions.java这个文件中创建的：

/**
* Create the global actions dialog.
* @return A new dialog.
*/
privateGlobalActionsDialogcreateDialog(){
// Simple toggle style if there's no vibrator, otherwise use a tri-state
if(!mHasVibrator){
mSilentModeAction=newSilentModeToggleAction();
}else{
mSilentModeAction=newSilentModeTriStateAction(mContext,mAudioManager,mHandler);
}
mAirplaneModeOn=newToggleAction(
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){
voidonToggle(booleanon){
if(mHasTelephony&&Boolean.parseBoolean(
SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))){
mIsWaitingForEcmExit=true;
// Launch ECM exit dialog
Intent ecmDialogIntent=
newIntent(TelephonyIntents.ACTION_SHOW_NOTICE_ECM_BLOCK_OTHERS,null);
ecmDialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mContext.startActivity(ecmDialogIntent);
}else{
changeAirplaneModeSystemSetting(on);
}
}
@Override
protectedvoidchangeStateFromPress(booleanbuttonOn){
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;
}
}
publicbooleanshowDuringKeyguard(){
returntrue;
}
publicbooleanshowBeforeProvisioning(){
returnfalse;
}
};
onAirplaneModeChanged();
mItems=newArrayList<Action>();
// first: power off
mItems.add(
newSinglePressAction(
com.android.internal.R.drawable.ic_lock_power_off,
R.string.global_action_power_off){
publicvoidonPress(){
// shutdown by making sure radio and power are handled accordingly.
mWindowManagerFuncs.shutdown(true);
}
publicbooleanonLongPress(){
mWindowManagerFuncs.rebootSafeMode(true);
returntrue;
}
publicbooleanshowDuringKeyguard(){
returntrue;
}
publicbooleanshowBeforeProvisioning(){
returntrue;
}
});

我们可以看到mItems.add函数是添加一个选项，该菜单的第一个选项就是关机选项，我们可以在此之后添加重启选项，代码如下：

mItems.add(
newSinglePressAction(
com.android.internal.R.drawable.ic_lock_power_off,
R.string.global_action_reboot){
publicvoidonPress(){
// reboot
mWindowManagerFuncs.reboot();
}
publicbooleanshowDuringKeyguard(){
returntrue;
}
publicbooleanshowBeforeProvisioning(){
returntrue;
}
});

上面的代码中使用了mWindowManagerFuncs.reboot函数和R.string.global_action_reboot资源，因此我们需要该资源并实现reboot函数。
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.
*/
publicinterfaceWindowManagerFuncs{
...
/**
* Switch the keyboard layout for the given device.
* Direction should be +1 or -1 to go to the next or previous keyboard layout.
*/
publicvoidswitchKeyboardLayout(intdeviceId,intdirection);
publicvoidshutdown();
publicvoidreboot();
publicvoidrebootSafeMode();
}

然后在frameworks/base/services/java/com/android/server/wm/WindowManagerService.java中实现该接口：

// Called by window manager policy. Not exposed externally.
@Override
publicvoidshutdown(){
ShutdownThread.shutdown(mContext,true);
}
// Called by window manager policy. Not exposed externally.
@Override
publicvoidreboot(){
ShutdownThread.reboot(mContext,null,true);
}
// Called by window manager policy. Not exposed externally.
@Override
publicvoidrebootSafeMode(){
ShutdownThread.rebootSafeMode(mContext,true);
}

接下来，为了在按下重启选项之后，能出现”重启“之类的提示，还需要修改frameworks/base/services/java/com/android/server/pm/ShutdownThread.java中的shutdownInner函数和beginShutdownSequence函数：

staticvoidshutdownInner(finalContextcontext,booleanconfirm){
// 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;
}
}
finalintlongPressBehavior=context.getResources().getInteger(
com.android.internal.R.integer.config_longPressOnPowerBehavior);
finalintresourceId=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){
finalCloseDialogReceiver closer=newCloseDialogReceiver(context);
finalAlertDialogdialog=newAlertDialog.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,newDialogInterface.OnClickListener(){
publicvoidonClick(DialogInterfacedialog,intwhich){
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);
}
}
privatestaticvoidbeginShutdownSequence(Contextcontext){
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=newProgressDialog(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(SecurityExceptione){
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(SecurityExceptione){
Log.w(TAG,"No permission to acquire wake lock",e);
sInstance.mScreenWakeLock=null;
}
}
// start the thread that initiates shutdown
sInstance.mHandler=newHandler(){
};
sInstance.start();
}

至此关于代码部分的改动全部完成，接下来就需要添加使用到的资源了，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>
<string name="global_action_reboot">Reboot</string>

而后需要在frameworks/base/core/res/res/values/public.xml中声明这些资源，否则编译的时候会出现找不到该资源的错误。

<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，编译烧写即可。

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