Android 4.1.2系统添加重启功能

2021-07-19 13:03:29

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：

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  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) {
  18. void onToggle(boolean on) {
  19. if (mHasTelephony && Boolean.parseBoolean(
  20. SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))) {
  21. mIsWaitingForEcmExit = true;
  22. // Launch ECM exit dialog
  23. Intent ecmDialogIntent =
  24. new Intent(TelephonyIntents.ACTION_SHOW_NOTICE_ECM_BLOCK_OTHERS, null);
  25. ecmDialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  26. mContext.startActivity(ecmDialogIntent);
  27. } else {
  28. changeAirplaneModeSystemSetting(on);
  29. }
  30. }
  31. @Override
  32. protected void changeStateFromPress(boolean buttonOn) {
  33. if (!mHasTelephony) return;
  34. // In ECM mode airplane state cannot be changed
  35. if (!(Boolean.parseBoolean(
  36. SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE)))) {
  37. mState = buttonOn ? State.TurningOn : State.TurningOff;
  38. mAirplaneState = mState;
  39. }
  40. }
  41. public boolean showDuringKeyguard() {
  42. return true;
  43. }
  44. public boolean showBeforeProvisioning() {
  45. return false;
  46. }
  47. };
  48. onAirplaneModeChanged();
  49. mItems = new ArrayList<Action>();
  50. // first: power off
  51. mItems.add(
  52. new SinglePressAction(
  53. com.android.internal.R.drawable.ic_lock_power_off,
  54. R.string.global_action_power_off) {
  55. public void onPress() {
  56. // shutdown by making sure radio and power are handled accordingly.
  57. mWindowManagerFuncs.shutdown(true);
  58. }
  59. public boolean onLongPress() {
  60. mWindowManagerFuncs.rebootSafeMode(true);
  61. return true;
  62. }
  63. public boolean showDuringKeyguard() {
  64. return true;
  65. }
  66. public boolean showBeforeProvisioning() {
  67. return true;
  68. }
  69. });

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. public void onPress() {
  6. // reboot
  7. mWindowManagerFuncs.reboot();
  8. }
  9. public boolean showDuringKeyguard() {
  10. return true;
  11. }
  12. public boolean showBeforeProvisioning() {
  13. return true;
  14. }
  15. });

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 {
  6. ...
  7. /**
  8. * Switch the keyboard layout for the given device.
  9. * Direction should be +1 or -1 to go to the next or previous keyboard layout.
  10. */
  11. public void switchKeyboardLayout(int deviceId, int direction);
  12. public void shutdown();
  13. public void reboot();
  14. public void rebootSafeMode();
  15. }

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. }
  6. // Called by window manager policy. Not exposed externally.
  7. @Override
  8. public void reboot() {
  9. ShutdownThread.reboot(mContext, null, true);
  10. }
  11. // Called by window manager policy. Not exposed externally.
  12. @Override
  13. public void rebootSafeMode() {
  14. ShutdownThread.rebootSafeMode(mContext, true);
  15. }

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. }
  10. final int longPressBehavior = context.getResources().getInteger(
  11. com.android.internal.R.integer.config_longPressOnPowerBehavior);
  12. final int resourceId = mRebootSafeMode
  13. ? com.android.internal.R.string.reboot_safemode_confirm
  14. : (longPressBehavior == 2
  15. ? com.android.internal.R.string.shutdown_confirm_question
  16. : (mReboot ? com.android.internal.R.string.reboot_confirm :
  17. com.android.internal.R.string.shutdown_confirm));
  18. Log.d(TAG, "Notifying
    thread to start shutdown longPressBehavior=" + longPressBehavior);
  19. if (confirm) {
  20. final CloseDialogReceiver
    closer = new CloseDialogReceiver(context);
  21. final AlertDialog dialog = new AlertDialog.Builder(context)
  22. .setTitle(mRebootSafeMode
  23. ? com.android.internal.R.string.reboot_safemode_title
  24. : (mReboot ? com.android.internal.R.string.reboot :
  25. com.android.internal.R.string.power_off))
  26. .setMessage(resourceId)
  27. .setPositiveButton(com.android.internal.R.string.yes, new DialogInterface.OnClickListener() {
  28. public void onClick(DialogInterface dialog, int which) {
  29. beginShutdownSequence(context);
  30. }
  31. })
  32. .setNegativeButton(com.android.internal.R.string.no, null)
  33. .create();
  34. closer.dialog = dialog;
  35. dialog.setOnDismissListener(closer);
  36. dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
  37. dialog.show();
  38. } else {
  39. beginShutdownSequence(context);
  40. }
  41. }
  42. private static void beginShutdownSequence(Context context) {
  43. synchronized (sIsStartedGuard) {
  44. if (sIsStarted) {
  45. Log.d(TAG, "Shutdown
    sequence already running, returning.");
  46. return;
  47. }
  48. sIsStarted = true;
  49. }
  50. // throw up an indeterminate system dialog to indicate radio is
  51. // shutting down.
  52. ProgressDialog pd = new ProgressDialog(context);
  53. pd.setTitle(context.getText(com.android.internal.R.string.power_off));
  54. pd.setMessage(context.getText(com.android.internal.R.string.shutdown_progress));
  55. pd.setIndeterminate(true);
  56. pd.setCancelable(false);
  57. pd.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
  58. pd.show();
  59. sInstance.mContext = context;
  60. sInstance.mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
  61. // make sure we never fall asleep again
  62. sInstance.mCpuWakeLock = null;
  63. try {
  64. sInstance.mCpuWakeLock = sInstance.mPowerManager.newWakeLock(
  65. PowerManager.PARTIAL_WAKE_LOCK, TAG + "-cpu");
  66. sInstance.mCpuWakeLock.setReferenceCounted(false);
  67. sInstance.mCpuWakeLock.acquire();
  68. } catch (SecurityException e) {
  69. Log.w(TAG, "No
    permission to acquire wake lock", e);
  70. sInstance.mCpuWakeLock = null;
  71. }
  72. // also make sure the screen stays on for better user experience
  73. sInstance.mScreenWakeLock = null;
  74. if (sInstance.mPowerManager.isScreenOn()) {
  75. try {
  76. sInstance.mScreenWakeLock = sInstance.mPowerManager.newWakeLock(
  77. PowerManager.FULL_WAKE_LOCK, TAG + "-screen");
  78. sInstance.mScreenWakeLock.setReferenceCounted(false);
  79. sInstance.mScreenWakeLock.acquire();
  80. } catch (SecurityException e) {
  81. Log.w(TAG, "No
    permission to acquire wake lock", e);
  82. sInstance.mScreenWakeLock = null;
  83. }
  84. }
  85. // start the thread that initiates shutdown
  86. sInstance.mHandler = new Handler() {
  87. };
  88. sInstance.start();
  89. }

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">Reboot\u2026</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。

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