HeadlessDisplayAdapter.java revision 64a55af0ac700baecb0877235eb42caac59a3560 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.server.display;
18
19import android.content.Context;
20import android.os.IBinder;
21import android.util.DisplayMetrics;
22
23/**
24 * Provides a fake default display for headless systems.
25 */
26public final class HeadlessDisplayAdapter extends DisplayAdapter {
27    private final Context mContext;
28    private final HeadlessDisplayDevice mDefaultDisplayDevice;
29
30    public HeadlessDisplayAdapter(Context context) {
31        mContext = context;
32        mDefaultDisplayDevice = new HeadlessDisplayDevice();
33    }
34
35    @Override
36    public String getName() {
37        return "HeadlessDisplayAdapter";
38    }
39
40    @Override
41    public void register(Listener listener) {
42        listener.onDisplayDeviceAdded(mDefaultDisplayDevice);
43    }
44
45    private final class HeadlessDisplayDevice extends DisplayDevice {
46        @Override
47        public DisplayAdapter getAdapter() {
48            return HeadlessDisplayAdapter.this;
49        }
50
51        @Override
52        public IBinder getDisplayToken() {
53            return null;
54        }
55
56        @Override
57        public void getInfo(DisplayDeviceInfo outInfo) {
58            outInfo.name = mContext.getResources().getString(
59                    com.android.internal.R.string.display_manager_built_in_display);
60            outInfo.width = 640;
61            outInfo.height = 480;
62            outInfo.refreshRate = 60;
63            outInfo.densityDpi = DisplayMetrics.DENSITY_DEFAULT;
64            outInfo.xDpi = 160;
65            outInfo.yDpi = 160;
66        }
67    }
68}
69