xref: /frameworks/base/services/core/java/com/android/server/am/UserSwitchingDialog.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.server.am;

import android.app.Service;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.res.Resources;
import android.os.Handler;
import android.os.Message;
import android.util.Slog;
import android.view.WindowManager;

/**
 * Dialog to show when a user switch it about to happen. The intent is to snapshot the screen
 * immediately after the dialog shows so that the user is informed that something is happening
 * in the background rather than just freeze the screen and not know if the user-switch affordance
 * was being handled.
 */
final class UserSwitchingDialog extends BaseErrorDialog {
    private static final String TAG = "ActivityManagerUserSwitchingDialog";

    private static final int MSG_START_USER = 1;

    private final ActivityManagerService mService;
    private final int mUserId;

    public UserSwitchingDialog(ActivityManagerService service, Context context,
            int userId, String userName, boolean aboveSystem) {
        super(context);

        mService = service;
        mUserId = userId;
        Resources res = context.getResources();
        setCancelable(false);
        setMessage(res.getString(com.android.internal.R.string.user_switching_message, userName));
        if (aboveSystem) {
            getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ERROR);
        }
        WindowManager.LayoutParams attrs = getWindow().getAttributes();
        attrs.privateFlags = WindowManager.LayoutParams.PRIVATE_FLAG_SYSTEM_ERROR |
                WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS;
        getWindow().setAttributes(attrs);
    }

    @Override
    public void show() {
        super.show();
        // TODO: Instead of just an arbitrary delay, wait for a signal that the window was fully
        // displayed by the window manager
        mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_START_USER), 250);
    }

    private final Handler mHandler = new Handler() {
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case MSG_START_USER:
                    mService.startUserInForeground(mUserId, UserSwitchingDialog.this);
                    break;
            }
        }
    };
}