Android5.0 长按电源键关机没有弹确定对话框直接关机

Android5.0 长按电源键关机没有弹确定对话框直接关机，但用户点击了关机选项之后，应该弹一个确定对话框给用户提示是否真的进入关机模式。

首先在frameworks层将对话框的标志位打开。

frameworks\base\policy\src\com\android\internal\policy\impl\GlobalActions.java

       @Override
        public void onPress() {
            final boolean quickbootEnabled = Settings.System.getInt(
                    mContext.getContentResolver(), "enable_quickboot", 0) == 1;
            // go to quickboot mode if enabled
            if (quickbootEnabled) {
                startQuickBoot();
                return;
            }
            // shutdown by making sure radio and power are handled accordingly.
            mWindowManagerFuncs.shutdown(true /* confirm */);//20150423 show the power-off dialog
        }

frameworks\base\services\core\java\com\android\server\power\ShutdownThread.java

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

        boolean showRebootOption = false;
        String[] defaultActions = context.getResources().getStringArray(
                com.android.internal.R.array.config_globalActionsList);
        for (int i = 0; i < defaultActions.length; i++) {
            if (defaultActions[i].equals("reboot") && mReboot) {// if (defaultActions[i].equals("reboot")) {20150421 for power_off dialog
                showRebootOption = true;
                break;
            }
        }
        final int longPressBehavior = context.getResources().getInteger(
                        com.android.internal.R.integer.config_longPressOnPowerBehavior);
        int resourceId = mRebootSafeMode
                ? com.android.internal.R.string.reboot_safemode_confirm
                : (longPressBehavior == 2
                        ? com.android.internal.R.string.shutdown_confirm_question
                        : com.android.internal.R.string.shutdown_confirm);
        if (showRebootOption && !mRebootSafeMode) {
            resourceId = com.android.internal.R.string.reboot_confirm;
        }

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

        if (confirm) {
            final CloseDialogReceiver closer = new CloseDialogReceiver(context);
            if (sConfirmDialog != null) {
                sConfirmDialog.dismiss();
            }
            sConfirmDialog = new AlertDialog.Builder(context)
                    .setTitle(mRebootSafeMode
                            ? com.android.internal.R.string.reboot_safemode_title
                            : showRebootOption
                                    ? com.android.internal.R.string.reboot_title
                                    : com.android.internal.R.string.power_off)
                    .setMessage(resourceId)
                    .setPositiveButton(com.android.internal.R.string.yes,
                            new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            beginShutdownSequence(context);
                        }
                    })
                    .setNegativeButton(com.android.internal.R.string.no, null)
                    .create();
            closer.dialog = sConfirmDialog;
            sConfirmDialog.setOnDismissListener(closer);
            sConfirmDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
            sConfirmDialog.show();
        } else {
            beginShutdownSequence(context);
        }
    }