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：

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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。