Android 4.1.2系统添加重启功能

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：

点击(此处)折叠或打开

  1. /**
  2.  * Create the global actions dialog.
  3.  * @return A new dialog.
  4.  */
  5. private GlobalActionsDialog createDialog() {
  6.     // Simple toggle style if there's no vibrator, otherwise use a tri-state
  7.     if (!mHasVibrator) {
  8.         mSilentModeAction = new SilentModeToggleAction();
  9.     } else {
  10.         mSilentModeAction = new SilentModeTriStateAction(mContext, mAudioManager, mHandler);
  11.     }
  12.     mAirplaneModeOn = new ToggleAction(
  13.             R.drawable.ic_lock_airplane_mode,
  14.             R.drawable.ic_lock_airplane_mode_off,
  15.             R.string.global_actions_toggle_airplane_mode,
  16.             R.string.global_actions_airplane_mode_on_status,
  17.             R.string.global_actions_airplane_mode_off_status) {

  19.         void onToggle(boolean on) {
  20.             if (mHasTelephony && Boolean.parseBoolean(
  21.                     SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))) {
  22.                 mIsWaitingForEcmExit = true;
  23.                 // Launch ECM exit dialog
  24.                 Intent ecmDialogIntent =
  25.                         new Intent(TelephonyIntents.ACTION_SHOW_NOTICE_ECM_BLOCK_OTHERS, null);
  26.                 ecmDialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  27.                 mContext.startActivity(ecmDialogIntent);
  28.             } else {
  29.                 changeAirplaneModeSystemSetting(on);
  30.             }
  31.         }

  33.         @Override
  34.         protected void changeStateFromPress(boolean buttonOn) {
  35.             if (!mHasTelephony) return;

  37.             // In ECM mode airplane state cannot be changed
  38.             if (!(Boolean.parseBoolean(
  39.                     SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE)))) {
  40.                 mState = buttonOn ? State.TurningOn : State.TurningOff;
  41.                 mAirplaneState = mState;
  42.             }
  43.         }

  45.         public boolean showDuringKeyguard() {
  46.             return true;
  47.         }

  49.         public boolean showBeforeProvisioning() {
  50.             return false;
  51.         }
  52.     };
  53.     onAirplaneModeChanged();

  55.     mItems = new ArrayList<Action>();

  57.     // first: power off
  58.     mItems.add(
  59.         new SinglePressAction(
  60.                 com.android.internal.R.drawable.ic_lock_power_off,
  61.                 R.string.global_action_power_off) {

  63.             public void onPress() {
  64.                 // shutdown by making sure radio and power are handled accordingly.
  65.                 mWindowManagerFuncs.shutdown(true);
  66.             }

  68.             public boolean onLongPress() {
  69.                 mWindowManagerFuncs.rebootSafeMode(true);
  70.                 return true;
  71.             }

  73.             public boolean showDuringKeyguard() {
  74.                 return true;
  75.             }

  77.             public boolean showBeforeProvisioning() {
  78.                 return true;
  79.             }
  80.         });
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：

  1. mItems.add(
  2.     new SinglePressAction(
  3.         com.android.internal.R.drawable.ic_lock_power_off,
  4.         R.string.global_action_reboot) { 
  5.      
  6.         public void onPress() { 
  7.             // reboot 
  8.             mWindowManagerFuncs.reboot();
  9.         } 
  10.          
  11.         public boolean showDuringKeyguard() { 
  12.             return true;
  13.         } 
  14.          
  15.         public boolean showBeforeProvisioning() { 
  16.             return true; 
  17.         } 
  18.     });
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：

  1. /**
  2.  * Interface for calling back in to the window manager that is private
  3.  * between it and the policy.
  4.  */
  5. public interface WindowManagerFuncs {

  7.     ...

  9.     /**
  10.      * Switch the keyboard layout for the given device.
  11.      * Direction should be +1 or -1 to go to the next or previous keyboard layout.
  12.      */
  13.     public void switchKeyboardLayout(int deviceId, int direction);

  15.     public void shutdown();
  16.     public void reboot(); 
  17.     public void rebootSafeMode();
  18. }
然后在frameworks/base/services/java/com/android/server/wm/WindowManagerService.java中实现该接口：

  1. // Called by window manager policy. Not exposed externally.
  2. @Override
  3. public void shutdown() {
  4.     ShutdownThread.shutdown(mContext, true);
  5. }

  7. // Called by window manager policy. Not exposed externally.
  8. @Override
  9. public void reboot() {
  10.     ShutdownThread.reboot(mContext, null, true);
  11. }

  13. // Called by window manager policy. Not exposed externally. 
  14. @Override
  15. public void rebootSafeMode() {
  16.     ShutdownThread.rebootSafeMode(mContext, true);
  17. }
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：

  1. static void shutdownInner(final Context context, boolean confirm) {
  2.     // ensure that only one thread is trying to power down.
  3.     // any additional calls are just returned
  4.     synchronized (sIsStartedGuard) {
  5.         if (sIsStarted) {
  6.             Log.d(TAG, "Request to shutdown already running, returning.");
  7.             return;
  8.         }
  9.     }

  11.     final int longPressBehavior = context.getResources().getInteger(
  12.                     com.android.internal.R.integer.config_longPressOnPowerBehavior);
  13.     final int resourceId = mRebootSafeMode
  14.             ? com.android.internal.R.string.reboot_safemode_confirm
  15.             : (longPressBehavior == 2
  16.                     ? com.android.internal.R.string.shutdown_confirm_question
  17.                     : (mReboot ? com.android.internal.R.string.reboot_confirm :
  18.                         com.android.internal.R.string.shutdown_confirm));

  20.     Log.d(TAG, "Notifying thread to start shutdown longPressBehavior=" + longPressBehavior);

  22.     if (confirm) {
  23.         final CloseDialogReceiver closer = new CloseDialogReceiver(context);
  24.         final AlertDialog dialog = new AlertDialog.Builder(context)
  25.                 .setTitle(mRebootSafeMode
  26.                         ? com.android.internal.R.string.reboot_safemode_title
  27.                         : (mReboot ? com.android.internal.R.string.reboot :
  28.                             com.android.internal.R.string.power_off))
  29.                 .setMessage(resourceId)
  30.                 .setPositiveButton(com.android.internal.R.string.yes, new DialogInterface.OnClickListener() {
  31.                     public void onClick(DialogInterface dialog, int which) {
  32.                         beginShutdownSequence(context);
  33.                     }
  34.                 })
  35.                 .setNegativeButton(com.android.internal.R.string.no, null)
  36.                 .create();
  37.         closer.dialog = dialog;
  38.         dialog.setOnDismissListener(closer);
  39.         dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
  40.         dialog.show();
  41.     } else {
  42.         beginShutdownSequence(context);
  43.     }
  44. }

  46. private static void beginShutdownSequence(Context context) {
  47.    synchronized (sIsStartedGuard) {
  48.        if (sIsStarted) {
  49.            Log.d(TAG, "Shutdown sequence already running, returning.");
  50.            return;
  51.        }
  52.        sIsStarted = true;
  53.    }

  55.    // throw up an indeterminate system dialog to indicate radio is
  56.    // shutting down.
  57.    ProgressDialog pd = new ProgressDialog(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.show();

  66.    sInstance.mContext = context;
  67.    sInstance.mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);

  69.    // make sure we never fall asleep again
  70.    sInstance.mCpuWakeLock = null;
  71.    try {
  72.        sInstance.mCpuWakeLock = sInstance.mPowerManager.newWakeLock(
  73.                PowerManager.PARTIAL_WAKE_LOCK, TAG + "-cpu");
  74.        sInstance.mCpuWakeLock.setReferenceCounted(false);
  75.        sInstance.mCpuWakeLock.acquire();
  76.    } catch (SecurityException e) {
  77.        Log.w(TAG, "No permission to acquire wake lock", e);
  78.        sInstance.mCpuWakeLock = null;
  79.    }

  81.    // also make sure the screen stays on for better user experience
  82.    sInstance.mScreenWakeLock = null;
  83.    if (sInstance.mPowerManager.isScreenOn()) {
  84.        try {
  85.            sInstance.mScreenWakeLock = sInstance.mPowerManager.newWakeLock(
  86.                    PowerManager.FULL_WAKE_LOCK, TAG + "-screen");
  87.            sInstance.mScreenWakeLock.setReferenceCounted(false);
  88.            sInstance.mScreenWakeLock.acquire();
  89.        } catch (SecurityException e) {
  90.            Log.w(TAG, "No permission to acquire wake lock", e);
  91.            sInstance.mScreenWakeLock = null;
  92.        }
  93.    }

  95.    // start the thread that initiates shutdown
  96.    sInstance.mHandler = new Handler() {
  97.    };
  98.    sInstance.start();
  99. }
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：

  1. <string name="reboot">Reboot</string>
  2. <string name="reboot_progress">Rebootu2026</string>
  3. <string name="reboot_confirm" product="tablet">Your tablet will reboot.</string>
  4. <string name="reboot_confirm" product="default">Your phone will reboot.</string>
  5. <!-- label for item that reboot in phone options dialog -->
  6. <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。

  1. <java-symbol type="string" name="reboot" />
  2. <java-symbol type="string" name="reboot_confirm" />
  3. <java-symbol type="string" name="reboot_progress" />
  4. <java-symbol type="string" name="global_action_reboot" />
至此，全部修改完成，编译烧写即可。
【推广】 免费学中医，健康全家人
原文地址：https://www.cnblogs.com/liang123/p/6325384.html