Android恢复出厂设置流程分析【Android源码解析十】

最近看恢复出厂的一个问题，以前也查过这方面的流程，所以这里整理一些AP+framework层的流程；

在setting-->备份与重置--->恢复出厂设置--->重置手机--->清除全部内容--->手机关机--->开机--->进行恢复出厂的操作--->开机流程；

Step1：前面找settings中的布局我就省略了，这部分相对简单一些，直接到清除全部内容这个按钮的操作，

对应的java类是setting中的MasterClearConfirm.java这个类，

2. publicvoidonClick(Viewv){
3. if(Utils.isMonkeyRunning()){
4. return;
5. }
7. if(mEraseSdCard){
8. Intentintent=newIntent(ExternalStorageFormatter.FORMAT_AND_FACTORY_RESET);
9. intent.setComponent(ExternalStorageFormatter.COMPONENT_NAME);
10. getActivity().startService(intent);
11. }else{
12. getActivity().sendBroadcast(newIntent("android.intent.action.MASTER_CLEAR"));
13. //Intenthandlingisasynchronous--assumeitwillhappensoon.
14. }
15. }
16. };

private Button.OnClickListener mFinalClickListener = new Button.OnClickListener() {        public void onClick(View v) {            if (Utils.isMonkeyRunning()) {                return;            }            if (mEraseSdCard) {                Intent intent = new Intent(ExternalStorageFormatter.FORMAT_AND_FACTORY_RESET);                intent.setComponent(ExternalStorageFormatter.COMPONENT_NAME);                getActivity().startService(intent);            } else {                getActivity().sendBroadcast(new Intent("android.intent.action.MASTER_CLEAR"));                // Intent handling is asynchronous -- assume it will happen soon.            }        }    };

通过上述的代码，可以看出，实际上点击清除全部内容的时候，如果前面勾选上格式哈SD卡，就会执行mEraseSdCard为true里面的逻辑，如果没有勾选，就执行mEraseSdCard=false的逻辑，其实就是发送一个广播，

1. “android.intent.action.MASTER_CLEAR”

“android.intent.action.MASTER_CLEAR”

1. <</SPAN>receiverandroid:name="com.android.server.MasterClearReceiver"
2. android:permission="android.permission.MASTER_CLEAR"
3. android:priority="100">
4. <</SPAN>intent-filter>
6. <</SPAN>actionandroid:name="android.intent.action.MASTER_CLEAR"/>
9. <</SPAN>actionandroid:name="com.google.android.c2dm.intent.RECEIVE"/>
10. <</SPAN>categoryandroid:name="android.intent.category.MASTER_CLEAR"/>
11. </</SPAN>intent-filter>
12. </</SPAN>receiver>

1. publicvoidonReceive(finalContextcontext,finalIntentintent){
2. if(intent.getAction().equals(Intent.ACTION_REMOTE_INTENT)){
3. if(!"google.com".equals(intent.getStringExtra("from"))){
4. Slog.w(TAG,"Ignoringmasterclearrequest--notfromtrustedserver.");
5. return;
6. }
7. }
9. Slog.w(TAG,"!!!FACTORYRESET!!!");
10. //Therebootcallisblocking,soweneedtodoitonanotherthread.
11. Threadthr=newThread("Reboot"){
12. @Override
13. publicvoidrun(){
14. try{
15. RecoverySystem.rebootWipeUserData(context);
16. Log.wtf(TAG,"Stillrunningaftermasterclear?!");
17. }catch(IOExceptione){
18. Slog.e(TAG,"Can'tperformmasterclear/factoryreset",e);
19. }
20. }
21. };
22. thr.start();
23. }

public void onReceive(final Context context, final Intent intent) {        if (intent.getAction().equals(Intent.ACTION_REMOTE_INTENT)) {            if (!"google.com".equals(intent.getStringExtra("from"))) {                Slog.w(TAG, "Ignoring master clear request -- not from trusted server.");                return;            }        }        Slog.w(TAG, "!!! FACTORY RESET !!!");        // The reboot call is blocking, so we need to do it on another thread.        Thread thr = new Thread("Reboot") {            @Override            public void run() {                try {                    RecoverySystem.rebootWipeUserData(context);                    Log.wtf(TAG, "Still running after master clear?!");                } catch (IOException e) {                    Slog.e(TAG, "Can't perform master clear/factory reset", e);                }            }        };        thr.start();    }

这个里面主要的操作是：RecoverySystem.rebootWipeUserData(context);准备做重启的动作，告诉手机要清除userData的数据；

Step3：接着来看看RecoverySystem.rebootWipeUserData（）这个方法做了哪些操作：

1. publicstaticvoidrebootWipeUserData(Contextcontext)throwsIOException{
2. finalConditionVariablecondition=newConditionVariable();
4. Intentintent=newIntent("android.intent.action.MASTER_CLEAR_NOTIFICATION");
5. context.sendOrderedBroadcastAsUser(intent,UserHandle.OWNER,
6. android.Manifest.permission.MASTER_CLEAR,
7. newBroadcastReceiver(){
8. @Override
9. publicvoidonReceive(Contextcontext,Intentintent){
10. condition.open();
11. }
12. },null,0,null,null);
14. //Blockuntiltheorderedbroadcasthascompleted.
15. condition.block();
17. bootCommand(context,"--wipe_datan--locale="+Locale.getDefault().toString());
18. }

public static void rebootWipeUserData(Context context) throws IOException {        final ConditionVariable condition = new ConditionVariable();        Intent intent = new Intent("android.intent.action.MASTER_CLEAR_NOTIFICATION");        context.sendOrderedBroadcastAsUser(intent, UserHandle.OWNER,                android.Manifest.permission.MASTER_CLEAR,                new BroadcastReceiver() {                    @Override                    public void onReceive(Context context, Intent intent) {                        condition.open();                    }                }, null, 0, null, null);        // Block until the ordered broadcast has completed.        condition.block();        bootCommand(context, "--wipe_datan--locale=" + Locale.getDefault().toString());    }

1. privatestaticvoidbootCommand(Contextcontext,Stringarg)throwsIOException{
2. RECOVERY_DIR.mkdirs();//Incaseweneedit
3. COMMAND_FILE.delete();//Incaseit'snotwritable
4. LOG_FILE.delete();
6. FileWritercommand=newFileWriter(COMMAND_FILE);
7. try{
8. command.write(arg);
9. command.write("n");
10. }finally{
11. command.close();
12. }
14. //Havingwrittenthecommandfile,goaheadandreboot
15. PowerManagerpm=(PowerManager)context.getSystemService(Context.POWER_SERVICE);
16. pm.reboot("recovery");
18. thrownewIOException("Rebootfailed(nopermissions?)");
19. }

private static void bootCommand(Context context, String arg) throws IOException {        RECOVERY_DIR.mkdirs();  // In case we need it        COMMAND_FILE.delete();  // In case it's not writable        LOG_FILE.delete();        FileWriter command = new FileWriter(COMMAND_FILE);        try {            command.write(arg);            command.write("n");        } finally {            command.close();        }        // Having written the command file, go ahead and reboot        PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);        pm.reboot("recovery");        throw new IOException("Reboot failed (no permissions?)");    }

Step4：接着我们来看看PowerManager的reboot方法做了哪些操作：

1. publicvoidreboot(Stringreason){
2. try{
3. mService.reboot(false,reason,true);
4. }catch(RemoteExceptione){
5. }
6. }

  public void reboot(String reason) {        try {            mService.reboot(false, reason, true);        } catch (RemoteException e) {        }    }

这个调用到了PowerManagerService.java这个类的reboot方法中了：

1. @Override//Bindercall
2. publicvoidreboot(booleanconfirm,Stringreason,booleanwait){
3. mContext.enforceCallingOrSelfPermission(android.Manifest.permission.REBOOT,null);
5. finallongident=Binder.clearCallingIdentity();
6. try{
7. shutdownOrRebootInternal(false,confirm,reason,wait);
8. }finally{
9. Binder.restoreCallingIdentity(ident);
10. }
11. }

@Override // Binder call    public void reboot(boolean confirm, String reason, boolean wait) {        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.REBOOT, null);        final long ident = Binder.clearCallingIdentity();        try {            shutdownOrRebootInternal(false, confirm, reason, wait);        } finally {            Binder.restoreCallingIdentity(ident);        }    }

1. privatevoidshutdownOrRebootInternal(finalbooleanshutdown,finalbooleanconfirm,
2. finalStringreason,booleanwait){
3. if(mHandler==null||!mSystemReady){
4. thrownewIllegalStateException("Tooearlytocallshutdown()orreboot()");
5. }
7. Runnablerunnable=newRunnable(){
8. @Override
9. publicvoidrun(){
10. synchronized(this){
11. if(shutdown){
12. ShutdownThread.shutdown(mContext,confirm);
13. }else{
14. ShutdownThread.reboot(mContext,reason,confirm);
15. }
16. }
17. }
18. };
20. //ShutdownThreadmustrunonaloopercapableofdisplayingtheUI.
21. Messagemsg=Message.obtain(mHandler,runnable);
22. msg.setAsynchronous(true);
23. mHandler.sendMessage(msg);
25. //PowerManager.reboot()isdocumentednottoreturnsojustwaitfortheinevitable.
26. if(wait){
27. synchronized(runnable){
28. while(true){
29. try{
30. runnable.wait();
31. }catch(InterruptedExceptione){
32. }
33. }
34. }
35. }
36. }

private void shutdownOrRebootInternal(final boolean shutdown, final boolean confirm,            final String reason, boolean wait) {        if (mHandler == null || !mSystemReady) {            throw new IllegalStateException("Too early to call shutdown() or reboot()");        }        Runnable runnable = new Runnable() {            @Override            public void run() {                synchronized (this) {                    if (shutdown) {                        ShutdownThread.shutdown(mContext, confirm);                    } else {                        ShutdownThread.reboot(mContext, reason, confirm);                    }                }            }        };        // ShutdownThread must run on a looper capable of displaying the UI.        Message msg = Message.obtain(mHandler, runnable);        msg.setAsynchronous(true);        mHandler.sendMessage(msg);        // PowerManager.reboot() is documented not to return so just wait for the inevitable.        if (wait) {            synchronized (runnable) {                while (true) {                    try {                        runnable.wait();                    } catch (InterruptedException e) {                    }                }            }        }    }

下面调用到ShutdownThread

Step5：这个追踪ShutdownThread.reboot()这个方法，这就有点像破案电影，一点一点查找罪犯的难点；

来窥视一下这个类：

1. publicstaticvoidreboot(finalContextcontext,Stringreason,booleanconfirm){
2. mReboot=true;
3. mRebootSafeMode=false;
4. mRebootReason=reason;
5. Log.d(TAG,"reboot");
6. shutdownInner(context,confirm);
7. }

 public static void reboot(final Context context, String reason, boolean confirm) {        mReboot = true;        mRebootSafeMode = false;        mRebootReason = reason;        Log.d(TAG, "reboot");        shutdownInner(context, confirm);    }

1. staticvoidshutdownInner(finalContextcontext,booleanconfirm){
2. //ensurethatonlyonethreadistryingtopowerdown.
3. //anyadditionalcallsarejustreturned
4. synchronized(sIsStartedGuard){
5. if(sIsStarted){
6. Log.d(TAG,"Requesttoshutdownalreadyrunning,returning.");
7. return;
8. }
9. }
11. Log.d(TAG,"Notifyingthreadtostartradioshutdown");
12. bConfirmForAnimation=confirm;
13. finalintlongPressBehavior=context.getResources().getInteger(
14. com.android.internal.R.integer.config_longPressOnPowerBehavior);
15. finalintresourceId=mRebootSafeMode
16. ?com.android.internal.R.string.reboot_safemode_confirm
17. :(longPressBehavior==2
18. ?com.android.internal.R.string.shutdown_confirm_question
19. :com.android.internal.R.string.shutdown_confirm);
21. Log.d(TAG,"NotifyingthreadtostartshutdownlongPressBehavior="+longPressBehavior);
23. if(confirm){
24. finalCloseDialogReceivercloser=newCloseDialogReceiver(context);
25. if(sConfirmDialog!=null){
26. sConfirmDialog.dismiss();
27. }
28. if(sConfirmDialog==null){
29. Log.d(TAG,"PowerOffdialogdoesn'texist.Createitfirst");
30. sConfirmDialog=newAlertDialog.Builder(context)
31. .setTitle(mRebootSafeMode
32. ?com.android.internal.R.string.reboot_safemode_title
33. :com.android.internal.R.string.power_off)
34. .setMessage(resourceId)
35. .setPositiveButton(com.android.internal.R.string.yes,newDialogInterface.OnClickListener(){
36. publicvoidonClick(DialogInterfacedialog,intwhich){
37. beginShutdownSequence(context);
38. if(sConfirmDialog!=null){
39. sConfirmDialog=null;
40. }
41. }
42. })
43. .setNegativeButton(com.android.internal.R.string.no,newDialogInterface.OnClickListener(){
44. publicvoidonClick(DialogInterfacedialog,intwhich){
45. synchronized(sIsStartedGuard){
46. sIsStarted=false;
47. }
48. if(sConfirmDialog!=null){
49. sConfirmDialog=null;
50. }
51. }
52. })
53. .create();
54. sConfirmDialog.setCancelable(false);//blockingbackkey
55. sConfirmDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
58. sConfirmDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
59. }
61. closer.dialog=sConfirmDialog;
62. sConfirmDialog.setOnDismissListener(closer);
64. if(!sConfirmDialog.isShowing()){
65. sConfirmDialog.show();
66. }
67. }else{
68. beginShutdownSequence(context);
69. }
70. }

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;            }        }        Log.d(TAG, "Notifying thread to start radio shutdown");        bConfirmForAnimation = confirm;        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                    : 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);            if (sConfirmDialog != null) {                sConfirmDialog.dismiss();            }            if (sConfirmDialog == null) {                Log.d(TAG, "PowerOff dialog doesn't exist. Create it first");                sConfirmDialog = new AlertDialog.Builder(context)                    .setTitle(mRebootSafeMode                            ? com.android.internal.R.string.reboot_safemode_title                            : 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);                            if (sConfirmDialog != null) {                            sConfirmDialog = null;                            }                            }                            })                .setNegativeButton(com.android.internal.R.string.no, new DialogInterface.OnClickListener() {                        public void onClick(DialogInterface dialog, int which) {                        synchronized (sIsStartedGuard) {                        sIsStarted = false;                        }                        if (sConfirmDialog != null) {                        sConfirmDialog = null;                        }                        }                        })                .create();                sConfirmDialog.setCancelable(false);//blocking back key                sConfirmDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);                                                sConfirmDialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);            }            closer.dialog = sConfirmDialog;            sConfirmDialog.setOnDismissListener(closer);            if (!sConfirmDialog.isShowing()) {                sConfirmDialog.show();            }        } else {            beginShutdownSequence(context);        }    }

1. privatestaticvoidbeginShutdownSequence(Contextcontext){
2. synchronized(sIsStartedGuard){
3. if(sIsStarted){
4. Log.e(TAG,"ShutdownThreadisalreadyrunning,returning.");
5. return;
6. }
7. sIsStarted=true;
8. }
10. //startthethreadthatinitiatesshutdown
11. sInstance.mContext=context;
12. sInstance.mPowerManager=(PowerManager)context.getSystemService(Context.POWER_SERVICE);
13. sInstance.mHandler=newHandler(){
14. };
16. bPlayaudio=true;
17. if(!bConfirmForAnimation){
18. if(!sInstance.mPowerManager.isScreenOn()){
19. bPlayaudio=false;
20. }
21. }
23. //throwupanindeterminatesystemdialogtoindicateradiois
24. //shuttingdown.
25. beginAnimationTime=0;
26. booleanmShutOffAnimation=false;
28. try{
29. if(mIBootAnim==null){
30. mIBootAnim=MediatekClassFactory.createInstance(IBootAnimExt.class);
31. }
32. }catch(Exceptione){
33. e.printStackTrace();
34. }
36. intscreenTurnOffTime=mIBootAnim.getScreenTurnOffTime();
37. mShutOffAnimation=mIBootAnim.isCustBootAnim();
38. Log.e(TAG,"mIBootAnimgetscreenTurnOffTime:"+screenTurnOffTime);
40. Stringcust=SystemProperties.get("ro.operator.optr");
42. if(cust!=null){
43. if(cust.equals("CUST")){
44. mShutOffAnimation=true;
45. }
46. }
48. synchronized(mEnableAnimatingSync){
50. if(!mEnableAnimating){
51. //sInstance.mPowerManager.setBacklightBrightness(PowerManager.BRIGHTNESS_DIM);
52. }else{
53. if(mShutOffAnimation){
54. Log.e(TAG,"mIBootAnim.isCustBootAnim()istrue");
55. bootanimCust();
56. }else{
57. pd=newProgressDialog(context);
58. pd.setTitle(context.getText(com.android.internal.R.string.power_off));
59. pd.setMessage(context.getText(com.android.internal.R.string.shutdown_progress));
60. pd.setIndeterminate(true);
61. pd.setCancelable(false);
62. pd.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
64. pd.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
65. pd.show();
66. }
67. sInstance.mHandler.postDelayed(mDelayDim,screenTurnOffTime);
68. }
69. }
71. //makesureweneverfallasleepagain
72. sInstance.mCpuWakeLock=null;
73. try{
74. sInstance.mCpuWakeLock=sInstance.mPowerManager.newWakeLock(
75. 。。。。。。
76. }

private static void beginShutdownSequence(Context context) {        synchronized (sIsStartedGuard) {            if (sIsStarted) {                Log.e(TAG, "ShutdownThread is already running, returning.");                            return;            }            sIsStarted = true;        }        // start the thread that initiates shutdown        sInstance.mContext = context;        sInstance.mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);        sInstance.mHandler = new Handler() {        };            bPlayaudio = true;        if (!bConfirmForAnimation) {            if (!sInstance.mPowerManager.isScreenOn()) {                bPlayaudio = false;            }        }        // throw up an indeterminate system dialog to indicate radio is        // shutting down.        beginAnimationTime = 0;        boolean mShutOffAnimation = false;        try {            if (mIBootAnim == null) {                mIBootAnim = MediatekClassFactory.createInstance(IBootAnimExt.class);            }        } catch (Exception e) {            e.printStackTrace();        }        int screenTurnOffTime = mIBootAnim.getScreenTurnOffTime();        mShutOffAnimation = mIBootAnim.isCustBootAnim();        Log.e(TAG, "mIBootAnim get screenTurnOffTime : " + screenTurnOffTime);        String cust = SystemProperties.get("ro.operator.optr");        if (cust != null) {            if (cust.equals("CUST")) {                mShutOffAnimation = true;            }        }        synchronized (mEnableAnimatingSync) {            if(!mEnableAnimating) {//                sInstance.mPowerManager.setBacklightBrightness(PowerManager.BRIGHTNESS_DIM);            } else {                if (mShutOffAnimation) {                    Log.e(TAG, "mIBootAnim.isCustBootAnim() is true");                    bootanimCust();                } 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);                                        pd.getWindow().addFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);                    pd.show();                }                sInstance.mHandler.postDelayed(mDelayDim, screenTurnOffTime );             }        }        // make sure we never fall asleep again        sInstance.mCpuWakeLock = null;        try {            sInstance.mCpuWakeLock = sInstance.mPowerManager.newWakeLock(                    。。。 。。。}

“sInstance.mHandler.postDelayed(mDelayDim,screenTurnOffTime );”

解决办法

（1）“可以把这个screenTurnOffTime时间乘以2，这个时间看log是5000毫秒，就是5秒，乘以2就是10秒，大概就能播放完全关机动画了。”

（2）把这句话注释掉，但是有可能会引起问题，导致恢复出厂设置的时候没有进行恢复出厂的操作。目前正在追踪此问题；

这段代码中还有影响关机动画是否走客制化的关机动画，如果ro.operator.optr这个属性配置的是CUST，则会走客制化的关机动画，否则走系统默认的关机动画；

1. Stringcust=SystemProperties.get("ro.operator.optr");
4. if(cust!=null){
5. if(cust.equals("CUST")){
6. mShutOffAnimation=true;
7. }
8. }

String cust = SystemProperties.get("ro.operator.optr");        if (cust != null) {            if (cust.equals("CUST")) {                mShutOffAnimation = true;            }        }

然后重点看sInstance.start();这个方法，就走到了run（）方法里满了；

Step6： 来看看ShutDownThread.java这个类的run（）方法；

1. publicvoidrun(){
2. checkShutdownFlow();
3. while(mShutdownFlow==IPO_SHUTDOWN_FLOW){
4. stMgr.saveStates(mContext);
5. stMgr.enterShutdown(mContext);
6. running();
7. }
8. if(mShutdownFlow!=IPO_SHUTDOWN_FLOW){
9. stMgr.enterShutdown(mContext);
10. running();
11. }
12. }

public void run() {        checkShutdownFlow();        while (mShutdownFlow == IPO_SHUTDOWN_FLOW) {            stMgr.saveStates(mContext);            stMgr.enterShutdown(mContext);            running();        }         if (mShutdownFlow != IPO_SHUTDOWN_FLOW) {            stMgr.enterShutdown(mContext);            running();        }    }

下面这个方法比较长，来分析一下：

1. publicvoidrunning(){
2. if(sPreShutdownApi!=null){
3. try{
4. sPreShutdownApi.onPowerOff();
5. }catch(RemoteExceptione){
6. Log.e(TAG,"onPowerOffexception"+e.getMessage());
7. }
8. }else{
9. Log.w(TAG,"sPreShutdownApiisnull");
10. }
12. command=SystemProperties.get("sys.ipo.pwrdncap");
14. BroadcastReceiverbr=newBroadcastReceiver(){
15. @OverridepublicvoidonReceive(Contextcontext,Intentintent){
16. //Wedon'tallowappstocancelthis,soignoretheresult.
17. actionDone();
18. }
19. };
22. {
23. Stringreason=(mReboot?"1":"0")+(mRebootReason!=null?mRebootReason:"");
24. SystemProperties.set(SHUTDOWN_ACTION_PROPERTY,reason);
25. }
28. if(mRebootSafeMode){
29. SystemProperties.set(REBOOT_SAFEMODE_PROPERTY,"1");
30. }
32. Log.i(TAG,"Sendingshutdownbroadcast...");
34. //Firstsendthehigh-levelshutdownbroadcast.
35. mActionDone=false;
36. ///M:2012-05-20ALPS00286063@{
37. mContext.sendBroadcast(newIntent("android.intent.action.ACTION_PRE_SHUTDOWN"));
38. ///@}2012-05-20
39. mContext.sendOrderedBroadcastAsUser((newIntent()).setAction(Intent.ACTION_SHUTDOWN).putExtra("_mode",mShutdownFlow),
40. UserHandle.ALL,null,br,mHandler,0,null,null);
42. finallongendTime=SystemClock.elapsedRealtime()+MAX_BROADCAST_TIME;
43. synchronized(mActionDoneSync){
44. while(!mActionDone){
45. longdelay=endTime-SystemClock.elapsedRealtime();
46. if(delay<=0){
47. Log.w(TAG,"ShutdownbroadcastACTION_SHUTDOWNtimedout");
48. if(mShutdownFlow==IPO_SHUTDOWN_FLOW){
49. Log.d(TAG,"changeshutdownflowfromipotonormal:ACTION_SHUTDOWNtimeout");
50. mShutdownFlow=NORMAL_SHUTDOWN_FLOW;
51. }
52. break;
53. }
54. try{
55. mActionDoneSync.wait(delay);
56. }catch(InterruptedExceptione){
57. }
58. }
59. }
61. //AlsosendACTION_SHUTDOWN_IPOinIPOshutdownflow
62. if(mShutdownFlow==IPO_SHUTDOWN_FLOW){
63. mActionDone=false;
64. mContext.sendOrderedBroadcast(newIntent("android.intent.action.ACTION_SHUTDOWN_IPO"),null,
65. br,mHandler,0,null,null);
66. finallongendTimeIPO=SystemClock.elapsedRealtime()+MAX_BROADCAST_TIME;
67. synchronized(mActionDoneSync){
68. while(!mActionDone){
69. longdelay=endTimeIPO-SystemClock.elapsedRealtime();
70. if(delay<=0){
71. Log.w(TAG,"ShutdownbroadcastACTION_SHUTDOWN_IPOtimedout");
72. if(mShutdownFlow==IPO_SHUTDOWN_FLOW){
73. Log.d(TAG,"changeshutdownflowfromipotonormal:ACTION_SHUTDOWN_IPOtimeout");
74. mShutdownFlow=NORMAL_SHUTDOWN_FLOW;
75. }
76. break;
77. }
78. try{
79. mActionDoneSync.wait(delay);
80. }catch(InterruptedExceptione){
81. }
82. }
83. }
84. }
86. if(mShutdownFlow!=IPO_SHUTDOWN_FLOW){
87. //poweroffautotest,don'tmodify
88. Log.i(TAG,"Shuttingdownactivitymanager...");
90. finalIActivityManageram=
91. ActivityManagerNative.asInterface(ServiceManager.checkService("activity"));
92. if(am!=null){
93. try{
94. am.shutdown(MAX_BROADCAST_TIME);
95. }catch(RemoteExceptione){
96. }
97. }
98. }
100. //poweroffautotest,don'tmodify
101. //Shutdownradios.
102. Log.i(TAG,"Shuttingdownradios...");
103. shutdownRadios(MAX_RADIO_WAIT_TIME);
105. //poweroffautotest,don'tmodify
106. Log.i(TAG,"ShuttingdownMountService...");
107. if((mShutdownFlow==IPO_SHUTDOWN_FLOW)&&(command.equals("1")||command.equals("3"))){
108. Log.i(TAG,"bypassMountService!");
109. }else{
110. //ShutdownMountServicetoensuremediaisinasafestate
111. IMountShutdownObserverobserver=newIMountShutdownObserver.Stub(){
112. publicvoidonShutDownComplete(intstatusCode)throwsRemoteException{
113. Log.w(TAG,"Resultcode"+statusCode+"fromMountService.shutdown");
114. if(statusCode<0){
115. mShutdownFlow=NORMAL_SHUTDOWN_FLOW;
116. }
117. actionDone();
118. }
119. };
123. //Setinitialvariablesandtimeouttime.
124. mActionDone=false;
125. finallongendShutTime=SystemClock.elapsedRealtime()+MAX_SHUTDOWN_WAIT_TIME;
126. synchronized(mActionDoneSync){
127. try{
128. finalIMountServicemount=IMountService.Stub.asInterface(
129. ServiceManager.checkService("mount"));
130. if(mount!=null){
131. mount.shutdown(observer);
132. }else{
133. Log.w(TAG,"MountServiceunavailableforshutdown");
134. }
135. }catch(Exceptione){
136. Log.e(TAG,"ExceptionduringMountServiceshutdown",e);
137. }
138. while(!mActionDone){
139. longdelay=endShutTime-SystemClock.elapsedRealtime();
140. if(delay<=0){
141. Log.w(TAG,"Shutdownwaittimedout");
142. if(mShutdownFlow==IPO_SHUTDOWN_FLOW){
143. Log.d(TAG,"changeshutdownflowfromipotonormal:MountService");
144. mShutdownFlow=NORMAL_SHUTDOWN_FLOW;
145. }
146. break;
147. }
148. try{
149. mActionDoneSync.wait(delay);
150. }catch(InterruptedExceptione){
151. }
152. }
153. }
154. }
156. //poweroffautotest,don'tmodify
157. //mountSerivce���
158. Log.i(TAG,"MountServiceshutdone...");
159. //[MTK]fixshutdownanimationtimingissue
160. //==================================================================
161. try{
162. SystemProperties.set("service.shutanim.running","1");
163. Log.i(TAG,"setservice.shutanim.runningto1");
165. }catch(Exceptionex){
166. Log.e(TAG,"Failedtoset'service.shutanim.running'=1).");
167. }
168. //==================================================================
170. if(mShutdownFlow==IPO_SHUTDOWN_FLOW){
171. if(SHUTDOWN_VIBRATE_MS>0){
172. //vibratebeforeshuttingdown
173. Vibratorvibrator=newSystemVibrator();
174. try{
175. vibrator.vibrate(SHUTDOWN_VIBRATE_MS);
176. }catch(Exceptione){
177. //Failuretovibrateshouldn'tinterruptshutdown.Justlogit.
178. Log.w(TAG,"Failedtovibrateduringshutdown.",e);
179. }
181. //vibratorisasynchronoussoweneedtowaittoavoidshuttingdowntoosoon.
182. try{
183. Thread.sleep(SHUTDOWN_VIBRATE_MS);
184. }catch(InterruptedExceptionunused){
185. }
186. }
188. //Shutdownpower
189. //poweroffautotest,don'tmodify
190. Log.i(TAG,"Performingipolow-levelshutdown...");
192. delayForPlayAnimation();
194. if(sInstance.mScreenWakeLock!=null&&sInstance.mScreenWakeLock.isHeld()){
195. sInstance.mScreenWakeLock.release();
196. sInstance.mScreenWakeLock=null;
197. }
199. sInstance.mHandler.removeCallbacks(mDelayDim);
200. stMgr.shutdown(mContext);
201. stMgr.finishShutdown(mContext);
203. //TovoidpreviousUIflickcausedbyshutdownanimationstoppingbeforeBKLturningoff
204. if(pd!=null){
205. pd.dismiss();
206. pd=null;
207. }elseif(beginAnimationTime>0){
208. try{
209. SystemProperties.set("service.bootanim.exit","1");
210. Log.i(TAG,"set'service.bootanim.exit'=1).");
211. }catch(Exceptionex){
212. Log.e(TAG,"Failedtoset'service.bootanim.exit'=1).");
213. }
214. //SystemProperties.set("ctl.stop","bootanim");
215. }
217. synchronized(sIsStartedGuard){
218. sIsStarted=false;
219. }
221. sInstance.mPowerManager.setBacklightBrightnessOff(false);
222. sInstance.mCpuWakeLock.acquire(2000);
224. synchronized(mShutdownThreadSync){
225. try{
226. mShutdownThreadSync.wait();
227. }catch(InterruptedExceptione){
228. }
229. }
230. }else{
231. rebootOrShutdown(mReboot,mRebootReason);
232. }
233. }

 public void running() {        if(sPreShutdownApi != null){            try {                sPreShutdownApi.onPowerOff();            } catch (RemoteException e) {                Log.e(TAG, "onPowerOff exception" + e.getMessage());            }        }else{            Log.w(TAG, "sPreShutdownApi is null");        }        command = SystemProperties.get("sys.ipo.pwrdncap");        BroadcastReceiver br = new BroadcastReceiver() {            @Override public void onReceive(Context context, Intent intent) {                // We don't allow apps to cancel this, so ignore the result.                actionDone();            }        };                {            String reason = (mReboot ? "1" : "0") + (mRebootReason != null ? mRebootReason : "");            SystemProperties.set(SHUTDOWN_ACTION_PROPERTY, reason);        }                if (mRebootSafeMode) {            SystemProperties.set(REBOOT_SAFEMODE_PROPERTY, "1");        }        Log.i(TAG, "Sending shutdown broadcast...");        // First send the high-level shut down broadcast.        mActionDone = false;        /// M: 2012-05-20 ALPS00286063 @{        mContext.sendBroadcast(new Intent("android.intent.action.ACTION_PRE_SHUTDOWN"));        /// @} 2012-05-20        mContext.sendOrderedBroadcastAsUser((new Intent()).setAction(Intent.ACTION_SHUTDOWN).putExtra("_mode", mShutdownFlow),                UserHandle.ALL, null, br, mHandler, 0, null, null);                final long endTime = SystemClock.elapsedRealtime() + MAX_BROADCAST_TIME;        synchronized (mActionDoneSync) {            while (!mActionDone) {                long delay = endTime - SystemClock.elapsedRealtime();                if (delay <= 0) {                    Log.w(TAG, "Shutdown broadcast ACTION_SHUTDOWN timed out");                    if (mShutdownFlow == IPO_SHUTDOWN_FLOW) {                        Log.d(TAG, "change shutdown flow from ipo to normal: ACTION_SHUTDOWN timeout");                        mShutdownFlow = NORMAL_SHUTDOWN_FLOW;                    }                    break;                }                try {                    mActionDoneSync.wait(delay);                } catch (InterruptedException e) {                }            }        }        // Also send ACTION_SHUTDOWN_IPO in IPO shut down flow        if (mShutdownFlow == IPO_SHUTDOWN_FLOW) {            mActionDone = false;            mContext.sendOrderedBroadcast(new Intent("android.intent.action.ACTION_SHUTDOWN_IPO"), null,                    br, mHandler, 0, null, null);            final long endTimeIPO = SystemClock.elapsedRealtime() + MAX_BROADCAST_TIME;            synchronized (mActionDoneSync) {                while (!mActionDone) {                    long delay = endTimeIPO - SystemClock.elapsedRealtime();                    if (delay <= 0) {                        Log.w(TAG, "Shutdown broadcast ACTION_SHUTDOWN_IPO timed out");                        if (mShutdownFlow == IPO_SHUTDOWN_FLOW) {                            Log.d(TAG, "change shutdown flow from ipo to normal: ACTION_SHUTDOWN_IPO timeout");                            mShutdownFlow = NORMAL_SHUTDOWN_FLOW;                        }                        break;                    }                    try {                        mActionDoneSync.wait(delay);                    } catch (InterruptedException e) {                    }                }            }        }        if (mShutdownFlow != IPO_SHUTDOWN_FLOW) {            // power off auto test, --don't modify            Log.i(TAG, "Shutting down activity manager...");            final IActivityManager am =                ActivityManagerNative.asInterface(ServiceManager.checkService("activity"));            if (am != null) {                try {                    am.shutdown(MAX_BROADCAST_TIME);                } catch (RemoteException e) {                }            }        }        // power off auto test, don't modify        // Shutdown radios.        Log.i(TAG, "Shutting down radios...");        shutdownRadios(MAX_RADIO_WAIT_TIME);        // power off auto test, don't modify        Log.i(TAG, "Shutting down MountService...");        if ( (mShutdownFlow == IPO_SHUTDOWN_FLOW) && (command.equals("1")||command.equals("3")) ) {            Log.i(TAG, "bypass MountService!");        } else {            // Shutdown MountService to ensure media is in a safe state            IMountShutdownObserver observer = new IMountShutdownObserver.Stub() {                public void onShutDownComplete(int statusCode) throws RemoteException {                    Log.w(TAG, "Result code " + statusCode + " from MountService.shutdown");                    if (statusCode < 0) {                        mShutdownFlow = NORMAL_SHUTDOWN_FLOW;                     }                    actionDone();                }            };                        // Set initial variables and time out time.            mActionDone = false;            final long endShutTime = SystemClock.elapsedRealtime() + MAX_SHUTDOWN_WAIT_TIME;            synchronized (mActionDoneSync) {                try {                    final IMountService mount = IMountService.Stub.asInterface(                            ServiceManager.checkService("mount"));                    if (mount != null) {                        mount.shutdown(observer);                    } else {                        Log.w(TAG, "MountService unavailable for shutdown");                    }                } catch (Exception e) {                    Log.e(TAG, "Exception during MountService shutdown", e);                }                while (!mActionDone) {                    long delay = endShutTime - SystemClock.elapsedRealtime();                    if (delay <= 0) {                        Log.w(TAG, "Shutdown wait timed out");                        if (mShutdownFlow == IPO_SHUTDOWN_FLOW) {                            Log.d(TAG, "change shutdown flow from ipo to normal: MountService");                            mShutdownFlow = NORMAL_SHUTDOWN_FLOW;                        }                        break;                    }                    try {                        mActionDoneSync.wait(delay);                    } catch (InterruptedException e) {                    }                }            }        }        // power off auto test, don't modify        //mountSerivce ���        Log.i(TAG, "MountService shut done...");        // [MTK] fix shutdown animation timing issue        //==================================================================        try {            SystemProperties.set("service.shutanim.running","1");            Log.i(TAG, "set service.shutanim.running to 1");        } catch (Exception ex) {            Log.e(TAG, "Failed to set 'service.shutanim.running' = 1).");        }        //==================================================================        if (mShutdownFlow == IPO_SHUTDOWN_FLOW) {            if (SHUTDOWN_VIBRATE_MS > 0) {                // vibrate before shutting down                Vibrator vibrator = new SystemVibrator();                try {                    vibrator.vibrate(SHUTDOWN_VIBRATE_MS);                } catch (Exception e) {                    // Failure to vibrate shouldn't interrupt shutdown.  Just log it.                    Log.w(TAG, "Failed to vibrate during shutdown.", e);                }                // vibrator is asynchronous so we need to wait to avoid shutting down too soon.                try {                    Thread.sleep(SHUTDOWN_VIBRATE_MS);                } catch (InterruptedException unused) {                }            }            // Shutdown power            // power off auto test, don't modify            Log.i(TAG, "Performing ipo low-level shutdown...");            delayForPlayAnimation();            if (sInstance.mScreenWakeLock != null && sInstance.mScreenWakeLock.isHeld()) {                sInstance.mScreenWakeLock.release();                sInstance.mScreenWakeLock = null;            }            sInstance.mHandler.removeCallbacks(mDelayDim);             stMgr.shutdown(mContext);            stMgr.finishShutdown(mContext);            //To void previous UI flick caused by shutdown animation stopping before BKL turning off                     if (pd != null) {                pd.dismiss();                pd = null;            } else if (beginAnimationTime > 0) {                try {                    SystemProperties.set("service.bootanim.exit","1");                    Log.i(TAG, "set 'service.bootanim.exit' = 1).");                } catch (Exception ex) {                    Log.e(TAG, "Failed to set 'service.bootanim.exit' = 1).");                }                  //SystemProperties.set("ctl.stop","bootanim");            }            synchronized (sIsStartedGuard) {                sIsStarted = false;            }            sInstance.mPowerManager.setBacklightBrightnessOff(false);             sInstance.mCpuWakeLock.acquire(2000);             synchronized (mShutdownThreadSync) {                try {                    mShutdownThreadSync.wait();                } catch (InterruptedException e) {                }            }        } else {            rebootOrShutdown(mReboot, mRebootReason);        }    }

1. shutdownRadios(MAX_RADIO_WAIT_TIME);
2. mount.shutdown(observer);
3. stMgr.shutdown(mContext);

Step7：来看看rebootOrShutdown（）这个方法：

1. publicstaticvoidrebootOrShutdown(booleanreboot,Stringreason){
2. if(reboot){
3. Log.i(TAG,"Rebooting,reason:"+reason);
4. if((reason!=null)&&reason.equals("recovery")){
5. delayForPlayAnimation();
6. }
7. try{
8. PowerManagerService.lowLevelReboot(reason);
9. }catch(Exceptione){
10. Log.e(TAG,"Rebootfailed,willattemptshutdowninstead",e);
11. }
12. }elseif(SHUTDOWN_VIBRATE_MS>0){
13. //vibratebeforeshuttingdown
14. Vibratorvibrator=newSystemVibrator();
15. try{
16. vibrator.vibrate(SHUTDOWN_VIBRATE_MS);
17. }catch(Exceptione){
18. //Failuretovibrateshouldn'tinterruptshutdown.Justlogit.
19. Log.w(TAG,"Failedtovibrateduringshutdown.",e);
20. }
22. //vibratorisasynchronoussoweneedtowaittoavoidshuttingdowntoosoon.
23. try{
24. Thread.sleep(SHUTDOWN_VIBRATE_MS);
25. }catch(InterruptedExceptionunused){
26. }
27. }
29. delayForPlayAnimation();
30. //Shutdownpower
31. //poweroffautotest,don'tmodify
32. Log.i(TAG,"Performinglow-levelshutdown...");
33. //PowerManagerService.lowLevelShutdown();
34. //addyourfunc:HDMIoff
35. //addforMFR
36. try{
37. if(ImHDMI==null)
38. ImHDMI=MediatekClassFactory.createInstance(IHDMINative.class);
39. }catch(Exceptione){
40. e.printStackTrace();
41. }
42. ImHDMI.hdmiPowerEnable(false);
43. try{
44. if(mTvOut==null)
45. mTvOut=MediatekClassFactory.createInstance(ITVOUTNative.class);
46. }catch(Exceptione){
47. e.printStackTrace();
48. }
50. mTvOut.tvoutPowerEnable(false);
51. //addyourfunc:HDMIoff
52. //unmoutdata/cachepartitionswhileperformingshutdown
54. SystemProperties.set("ctl.start","shutdown");
57. try{
58. Thread.currentThread().sleep(Integer.MAX_VALUE);
59. }catch(Exceptione){
60. Log.e(TAG,"ShutdownrebootOrShutdownThread.currentThread().sleepexception!");
61. }
62. }

public static void rebootOrShutdown(boolean reboot, String reason) {        if (reboot) {            Log.i(TAG, "Rebooting, reason: " + reason);            if ( (reason != null) && reason.equals("recovery") ) {                delayForPlayAnimation();            }            try {                PowerManagerService.lowLevelReboot(reason);            } catch (Exception e) {                Log.e(TAG, "Reboot failed, will attempt shutdown instead", e);            }        } else if (SHUTDOWN_VIBRATE_MS > 0) {            // vibrate before shutting down            Vibrator vibrator = new SystemVibrator();            try {                vibrator.vibrate(SHUTDOWN_VIBRATE_MS);            } catch (Exception e) {                // Failure to vibrate shouldn't interrupt shutdown.  Just log it.                Log.w(TAG, "Failed to vibrate during shutdown.", e);            }            // vibrator is asynchronous so we need to wait to avoid shutting down too soon.            try {                Thread.sleep(SHUTDOWN_VIBRATE_MS);            } catch (InterruptedException unused) {            }        }        delayForPlayAnimation();        // Shutdown power        // power off auto test, don't modify        Log.i(TAG, "Performing low-level shutdown...");        //PowerManagerService.lowLevelShutdown();        //add your func: HDMI off        //add for MFR        try {            if (ImHDMI == null)                ImHDMI=MediatekClassFactory.createInstance(IHDMINative.class);        } catch (Exception e) {            e.printStackTrace();                            }        ImHDMI.hdmiPowerEnable(false);        try {            if (mTvOut == null)                mTvOut =MediatekClassFactory.createInstance(ITVOUTNative.class);        } catch (Exception e) {            e.printStackTrace();                            }        mTvOut.tvoutPowerEnable(false);        //add your func: HDMI off        //unmout data/cache partitions while performing shutdown        SystemProperties.set("ctl.start", "shutdown");                try {            Thread.currentThread().sleep(Integer.MAX_VALUE);        } catch ( Exception e) {            Log.e(TAG, "Shutdown rebootOrShutdown Thread.currentThread().sleep exception!");          }    }

Log.i(TAG, "Rebooting, reason: " +reason);这句log也很重要，可以有助于我们分析代码；

Step8：下面来看看PowerManagerServices.java这个类的lowLevelReboot（）这个方法：

1. publicstaticvoidlowLevelReboot(Stringreason)throwsIOException{
2. nativeReboot(reason);
3. }

public static void lowLevelReboot(String reason) throws IOException {        nativeReboot(reason);    }

大致流程是：

关机，然后开机，底层判断节点后进入恢复出厂模式，recevory.img释放完全后，进入开机的流程。。。

以后有进展再补充这部分的流程，整个过程大致就是这个样子了，里面的细节有好多没有分析，大家可以自行研究。。。，抛砖引玉的目的达到了。

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