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/

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原文地址：https://www.cnblogs.com/LoongEmbedded/p/5298305.html