HeadlessDisplayAdapter.java revision 848c2dc93b6795e171f3dd6f64ea0be65e2762ca 
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.util.DisplayMetrics;
21
22/**
23 * Provides a fake default display for headless systems.
24 */
25public final class HeadlessDisplayAdapter extends DisplayAdapter {
26    private final Context mContext;
27    private final HeadlessDisplayDevice mDefaultDisplayDevice;
28
29    public HeadlessDisplayAdapter(Context context) {
30        mContext = context;
31        mDefaultDisplayDevice = new HeadlessDisplayDevice();
32    }
33
34    @Override
35    public String getName() {
36        return "HeadlessDisplayAdapter";
37    }
38
39    @Override
40    public void register(Listener listener) {
41        listener.onDisplayDeviceAdded(mDefaultDisplayDevice);
42    }
43
44    private final class HeadlessDisplayDevice extends DisplayDevice {
45        @Override
46        public DisplayAdapter getAdapter() {
47            return HeadlessDisplayAdapter.this;
48        }
49
50        @Override
51        public void getInfo(DisplayDeviceInfo outInfo) {
52            outInfo.name = mContext.getResources().getString(
53                    com.android.internal.R.string.display_manager_built_in_display);
54            outInfo.width = 640;
55            outInfo.height = 480;
56            outInfo.refreshRate = 60;
57            outInfo.densityDpi = DisplayMetrics.DENSITY_DEFAULT;
58            outInfo.xDpi = 160;
59            outInfo.yDpi = 160;
60        }
61    }
62}
63