The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 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 | |
| 17 | package android.view; |
| 18 | |
| 19 | import android.util.DisplayMetrics; |
| 20 | |
| 21 | public class Display |
| 22 | { |
| 23 | /** |
| 24 | * Specify the default Display |
| 25 | */ |
| 26 | public static final int DEFAULT_DISPLAY = 0; |
| 27 | |
| 28 | |
| 29 | /** |
| 30 | * Use the WindowManager interface to create a Display object. |
| 31 | * Display gives you access to some information about a particular display |
| 32 | * connected to the device. |
| 33 | */ |
| 34 | Display(int display) { |
| 35 | // initalize the statics when this class is first instansiated. This is |
| 36 | // done here instead of in the static block because Zygote |
| 37 | synchronized (mStaticInit) { |
| 38 | if (!mInitialized) { |
| 39 | nativeClassInit(); |
| 40 | mInitialized = true; |
| 41 | } |
| 42 | } |
| 43 | mDisplay = display; |
| 44 | init(display); |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * @return index of this display. |
| 49 | */ |
| 50 | public int getDisplayId() { |
| 51 | return mDisplay; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * @return the number of displays connected to the device. |
| 56 | */ |
| 57 | native static int getDisplayCount(); |
| 58 | |
| 59 | /** |
| 60 | * @return width of this display in pixels. |
| 61 | */ |
| 62 | native public int getWidth(); |
| 63 | |
| 64 | /** |
| 65 | * @return height of this display in pixels. |
| 66 | */ |
| 67 | native public int getHeight(); |
| 68 | |
| 69 | /** |
| 70 | * @return orientation of this display. |
| 71 | */ |
| 72 | native public int getOrientation(); |
| 73 | |
| 74 | /** |
| 75 | * @return pixel format of this display. |
| 76 | */ |
| 77 | public int getPixelFormat() { |
| 78 | return mPixelFormat; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * @return refresh rate of this display in frames per second. |
| 83 | */ |
| 84 | public float getRefreshRate() { |
| 85 | return mRefreshRate; |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Initialize a DisplayMetrics object from this display's data. |
| 90 | * |
| 91 | * @param outMetrics |
| 92 | */ |
| 93 | public void getMetrics(DisplayMetrics outMetrics) { |
| 94 | outMetrics.widthPixels = getWidth(); |
| 95 | outMetrics.heightPixels = getHeight(); |
| 96 | outMetrics.density = mDensity; |
Dianne Hackborn | 11ea334 | 2009-07-22 21:48:55 -0700 | [diff] [blame] | 97 | outMetrics.densityDpi = (int)((mDensity*DisplayMetrics.DENSITY_DEFAULT)+.5f); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 98 | outMetrics.scaledDensity= outMetrics.density; |
| 99 | outMetrics.xdpi = mDpiX; |
| 100 | outMetrics.ydpi = mDpiY; |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * We use a class initializer to allow the native code to cache some |
| 105 | * field offsets. |
| 106 | */ |
| 107 | native private static void nativeClassInit(); |
| 108 | |
| 109 | private native void init(int display); |
| 110 | |
| 111 | private int mDisplay; |
| 112 | // Following fields are initialized from native code |
| 113 | private int mPixelFormat; |
| 114 | private float mRefreshRate; |
| 115 | private float mDensity; |
| 116 | private float mDpiX; |
| 117 | private float mDpiY; |
| 118 | |
| 119 | private static final Object mStaticInit = new Object(); |
| 120 | private static boolean mInitialized = false; |
Mitsuru Oshima | ddd1253 | 2009-07-14 10:41:13 -0700 | [diff] [blame] | 121 | |
| 122 | /** |
| 123 | * Returns a display object which uses the metric's width/height instead. |
| 124 | * @hide |
| 125 | */ |
| 126 | public static Display createMetricsBasedDisplay(int displayId, DisplayMetrics metrics) { |
| 127 | return new CompatibleDisplay(displayId, metrics); |
| 128 | } |
| 129 | |
| 130 | private static class CompatibleDisplay extends Display { |
| 131 | private final DisplayMetrics mMetrics; |
| 132 | |
| 133 | private CompatibleDisplay(int displayId, DisplayMetrics metrics) { |
| 134 | super(displayId); |
| 135 | mMetrics = metrics; |
| 136 | } |
| 137 | |
| 138 | @Override |
| 139 | public int getWidth() { |
| 140 | return mMetrics.widthPixels; |
| 141 | } |
| 142 | |
| 143 | @Override |
| 144 | public int getHeight() { |
| 145 | return mMetrics.heightPixels; |
| 146 | } |
| 147 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 148 | } |
| 149 | |