MTK 快速开机 技术详解

Android version 2.3.5

首先查看Settings里控制开关

01

// 获取当前状态

02	boolean ipoSettingEnabled = Settings.System.getInt(getContentResolver(),

03	Settings.System.IPO_SETTING,1) == 1;

04	if(mIpoSetting!=null){

05	mIpoSetting.setChecked(ipoSettingEnabled);

06

}

07

//设置新状态

08	boolean isChecked = ((CheckBoxPreference) preference).isChecked();

09	Settings.System.putInt(getContentResolver(), Settings.System.IPO_SETTING,

10	isChecked ? 1:0);

全局搜索 Settings.System.IPO_SETTING ，发现在关机系统里调用了该状态（ShutdownThread.java）

ShutdownThread 里的 checkShutdownFlow 方法

01	// 判断是否不支持该功能 是否需要重启

02	if (FeatureOption.MTK_IPO_SUPPORT == false || mReboot == true) {

03	mShutdownFlow = NORMAL_SHUTDOWN_FLOW;    // 更改状态

04

return;

05

}

06	boolean isIPOEnabled;

07

try {

08

// 获取当前状态

09	isIPOEnabled = Settings.System.getInt(sInstance.mContext.getContentResolver(),

10	Settings.System.IPO_SETTING, 1) == 1;

11	} catch (NullPointerException ex) {

12	mShutdownFlow = NORMAL_SHUTDOWN_FLOW;

13

return;

14

}

15	if (isIPOEnabled == true) {

16

// 判断系统参数

17	if ("1".equals(SystemProperties.get("sys.ipo.battlow")))

18	mShutdownFlow = NORMAL_SHUTDOWN_FLOW;

19

else

20	mShutdownFlow = IPO_SHUTDOWN_FLOW;

21

} else {

22	mShutdownFlow = NORMAL_SHUTDOWN_FLOW;

23

}

24

return;

以上函数如果正常进入快速关机模式 
mShutdownFlow = IPO_SHUTDOWN_FLOW

关机流程会调用 ShutdownThread.shutdown(mContext, true);

ShutdownThread 里的 shutdown 方法

01	bConfirmForAnimation = confirm;

02	if (confirm) {

03	if (mDialog == null) {

04	mDialog = new AlertDialog.Builder(context)

05	.setIcon(android.R.drawable.ic_dialog_alert)

06	.setTitle(com.android.internal.R.string.power_off)

07	.setMessage(com.android.internal.R.string.shutdown_confirm)

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

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

10	//确认关机 检查状态

11	beginShutdownSequence(context);

12	if (mDialog != null) {

13	mDialog = null;

14

}

15

}

16

})

17	.setNegativeButton(com.android.internal.R.string.no, new DialogInterface.OnClickListener() {

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

19	synchronized (sIsStartedGuard) {

20	sIsStarted = false;

21

}

22	if (mDialog != null) {

23	mDialog = null;

24

}

25

}

26

})

27	.create();

28	mDialog.setCancelable(false);

29	mDialog.getWindow().setType(

30	WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);

31	mDialog.getWindow().addFlags(

32	WindowManager.LayoutParams.FLAG_DIM_BEHIND);

33

}

34	if (!mDialog.isShowing()) {

35	mDialog.show();

36

}

37

} else {

38	beginShutdownSequence(context);

39

}

ShutdownThread 里的 beginShutdownSequence 方法

1	if (mShutdownFlow == IPO_SHUTDOWN_FLOW) {

2	checkShutdownFlow();

3	synchronized (mShutdownThreadSync) {

4	mShutdownThreadSync.notify();

5

}

6

}

ShutdownThread 里的 run 方法

01	public void run() {

02	checkShutdownFlow();

03	while (mShutdownFlow == IPO_SHUTDOWN_FLOW) {

04	stMgr.saveStates(mContext);

05	running();

06

}

07	if (mShutdownFlow != IPO_SHUTDOWN_FLOW) {

08	running();

09

}

10

}

adb logcat -s “ShutdownThread”

01	--------- beginning of /dev/log/system

02	--------- beginning of /dev/log/main

03	D/ShutdownThread(  189): !!! Request to shutdown !!!

04	D/ShutdownThread(  189): Notifying thread to start radio shutdown

05	D/ShutdownThread(  189): PowerOff dialog doesn't exist. Create it first

06	D/ShutdownThread(  189): ShutdownThread exists already

07	D/ShutdownThread(  189): checkShutdownFlow: IPO_Support=true mReboot=false

08	D/ShutdownThread(  189): checkShutdownFlow: isIPOEnabled=true mShutdownFlow=1

09	D/ShutdownThread(  189): shutdown acquire partial WakeLock 2

10	I/ShutdownThread(  189): Sending shutdown broadcast...

11	I/ShutdownThread(  189): Waiting for Bluetooth and Radio...

12	I/ShutdownThread(  189): Radio and Bluetooth shutdown complete.

13	I/ShutdownThread(  189): Shutting down MountService

14	W/ShutdownThread(  189): Result code 0 from MountService.shutdown

15	I/ShutdownThread(  189): Performing ipo low-level shutdown...

ShutdownManager 里的 saveStates 方法

1	//保存wifi状态

ShutdownThread 里的 running 方法

1	//广播全局事件 android.intent.action.ACTION_SHUTDOWN_IPO

2

//关闭蓝牙

3

//关闭Radio

4	//关闭MountService

5	stMgr.shutdown(mContext);

ShutdownManager 里的 shutdown 方法

1	mPowerManager = (PowerManager)context.getSystemService("power");

2	mPowerManager.goToSleep(SystemClock.uptimeMillis());

3

......

4	SystemProperties.set("ctl.start", "ipod");

5	Intent intent = new Intent("android.intent.action.black.mode");

6	intent.putExtra("_black_mode", true);

7	context.sendBroadcast(intent);

adb logcat -s “ShutdownManager”

01	--------- beginning of /dev/log/system

02	--------- beginning of /dev/log/main

03	I/ShutdownManager(  189): btState: false

04	I/ShutdownManager(  189): saveStates: wifi:0, airplaneModeState: 0

05	V/ShutdownManager(  189): Current Wallpaper = null

06	V/ShutdownManager(  189): Current IME: com.android.inputmethod.pinyin

07	I/ShutdownManager(  189): accessibility is disabled

08	I/ShutdownManager(  189): killProcess (IME): com.android.inputmethod.pinyin

09	I/ShutdownManager(  189): forceStopPackage: com.cooliris.media

10	V/ShutdownManager(  189): process = com.android.settings

11	I/ShutdownManager(  189): forceStopPackage: com.android.settings

12	I/ShutdownManager(  189): forceStopPackage: com.mediatek.launcherplus

13	I/ShutdownManager(  189): forceStopPackage: com.android.mms

14	I/ShutdownManager(  189): forceStopPackage: android.process.media

15	I/ShutdownManager(  189): forceStopPackage: android.process.media

16	I/ShutdownManager(  189): forceStopPackage: android.process.media

17	I/ShutdownManager(  189): forceStopPackage: com.mediatek.moreapp

18	I/ShutdownManager(  189): forceStopPackage: com.mediatek.omacp

19	I/ShutdownManager(  189): forceStopPackage: com.android.email

20	V/ShutdownManager(  189): uid-process = com.mediatek.mdlogger

21	I/ShutdownManager(  189): forceStopPackage: com.android.providers.calendar

22	I/ShutdownManager(  189): forceStopPackage: com.android.deskclock

23	V/ShutdownManager(  189): uid-process = com.android.ActivityNetwork

24	I/ShutdownManager(  189): forceStopPackage: com.mediatek.weather

ActivityManagerPlus 接收到关机广播

adb logcat -s “ActivityManagerPlus”

1	--------- beginning of /dev/log/system

2	--------- beginning of /dev/log/main

3	I/ActivityManagerPlus(  189): Receive:

4	Intent { act=android.intent.action.ACTION_SHUTDOWN_IPO }

5	I/ActivityManagerPlus(  189): finished

6	I/ActivityManagerPlus(  189): Receive:

7	Intent { act=android.intent.action.black.mode (has  extras) }

8	I/ActivityManagerPlus(  189): createIPOWin

ActivityManagerPlus 里的 createIPOWin 方法 关机调用

01	Window win = PolicyManager.makeNewWindow(context);

02	win.setType(2016);

03	win.setFlags(1024, 1024);

04	win.setLayout(-1, -1);

05	win.requestFeature(1);

06	android.view.WindowManager.LayoutParams params = win.getAttributes();

07	params.setTitle("IPOWindow");

08	params.flags = 24;

09	WindowManagerImpl wm = (WindowManagerImpl)context.getSystemService("window");

10	view = win.getDecorView();

11	wm.addView(view, params);

ActivityManagerPlus 里的 removeIPOWin 方法 开机调用

1	WindowManagerImpl wm = (WindowManagerImpl)context.getSystemService("window");

2	wm.removeView(view);

底层实现 
mediatek/source/external/ipod/