• 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/liang123/p/6325380.html
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