android5.1添加android长按power键重启功能

当用户长按power键的时候，系统会在PhoneWindowManager中调用



mGlobalActions.showDialog，来显示关机、飞行、重启等界面选项。

而我们需要在GlobalActions.java中创建一个重启的选项。下面我们从GlobalActions中的createDialog节选一段代码：

        mItems = new ArrayList<Action>();
        String[] defaultActions = mContext.getResources().getStringArray(
                com.android.internal.R.array.config_globalActionsList);//读取配置文件中config_globalActionsList内容，下面详细介绍

        ArraySet<String> addedKeys = new ArraySet<String>();
        for (int i = 0; i < defaultActions.length; i++) {
            String actionKey = defaultActions[i];
            if (addedKeys.contains(actionKey)) {
                // If we already have added this, don't add it again.
                continue;
            }
            if (GLOBAL_ACTION_KEY_POWER.equals(actionKey)) {
                mItems.add(new PowerAction());
            } else if (GLOBAL_ACTION_KEY_AIRPLANE.equals(actionKey)) {
                mItems.add(mAirplaneModeOn);
            else if (GLOBAL_ACTION_KEY_REBOOT.equals(actionKey)) {//我们自己添加了一个重启功能，在config文件中找到reboot这一项就添加这个reboot
                mItems.add(new RebootAction());
            } else if (GLOBAL_ACTION_KEY_BUGREPORT.equals(actionKey)) {
                if (Settings.Global.getInt(mContext.getContentResolver(),
                        Settings.Global.BUGREPORT_IN_POWER_MENU, 0) != 0 && isCurrentUserOwner()) {
                    mItems.add(getBugReportAction());
                }
            } else if (GLOBAL_ACTION_KEY_SILENT.equals(actionKey)) {
                if (mShowSilentToggle) {
                    mItems.add(mSilentModeAction);
                }
            } else if (GLOBAL_ACTION_KEY_USERS.equals(actionKey)) {
                if (SystemProperties.getBoolean("fw.power_user_switcher", false)) {
                    addUsersToMenu(mItems);
                }
            } else if (GLOBAL_ACTION_KEY_SETTINGS.equals(actionKey)) {
                mItems.add(getSettingsAction());
            } else if (GLOBAL_ACTION_KEY_LOCKDOWN.equals(actionKey)) {
                mItems.add(getLockdo