DisplayMetrics.java revision e2515eebf42c763c0a2d9f873a153711778cfc17
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.util; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 19e2515eebf42c763c0a2d9f873a153711778cfc17Dianne Hackbornimport android.os.SystemProperties; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A structure describing general information about a display, such as its 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * size, density, and font scaling. 2571d4b289a7a934ecd16c3036b812d40db6d3a74dScott Main * <p>To access the DisplayMetrics members, initialize an object like this:</p> 2671d4b289a7a934ecd16c3036b812d40db6d3a74dScott Main * <pre> DisplayMetrics metrics = new DisplayMetrics(); 2771d4b289a7a934ecd16c3036b812d40db6d3a74dScott Main * getWindowManager().getDefaultDisplay().getMetrics(metrics);</pre> 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class DisplayMetrics { 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 31a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn * Standard quantized DPI for low-density screens. 32a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn */ 33a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn public static final int DENSITY_LOW = 120; 34a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn 35a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn /** 36a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn * Standard quantized DPI for medium-density screens. 37a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn */ 38a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn public static final int DENSITY_MEDIUM = 160; 39a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn 40a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn /** 41a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn * Standard quantized DPI for high-density screens. 42a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn */ 43a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn public static final int DENSITY_HIGH = 240; 44a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn 45a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn /** 46a0b46c9c441f017a2008ca8ee2c864987465996bDianne Hackborn * Standard quantized DPI for extra-high-density screens. 47a0b46c9c441f017a2008ca8ee2c864987465996bDianne Hackborn */ 48a0b46c9c441f017a2008ca8ee2c864987465996bDianne Hackborn public static final int DENSITY_XHIGH = 320; 49a0b46c9c441f017a2008ca8ee2c864987465996bDianne Hackborn 50a0b46c9c441f017a2008ca8ee2c864987465996bDianne Hackborn /** 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The reference density used throughout the system. 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 53a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn public static final int DENSITY_DEFAULT = DENSITY_MEDIUM; 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 552e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima /** 562e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima * The device's density. 57a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn * @hide becase eventually this should be able to change while 58a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn * running, so shouldn't be a constant. 592e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima */ 60a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn public static final int DENSITY_DEVICE = getDeviceDensity(); 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The absolute width of the display in pixels. 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int widthPixels; 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The absolute height of the display in pixels. 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int heightPixels; 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The logical density of the display. This is a scaling factor for the 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Density Independent Pixel unit, where one DIP is one pixel on an 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * approximately 160 dpi screen (for example a 240x320, 1.5"x2" screen), 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * providing the baseline of the system's display. Thus on a 160dpi screen 756b13bc043e715b5415b701e93141daa0d49fa364Dirk Dougherty * this density value will be 1; on a 120 dpi screen it would be .75; etc. 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This value does not exactly follow the real screen size (as given by 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link #xdpi} and {@link #ydpi}, but rather is used to scale the size of 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the overall UI in steps based on gross changes in the display dpi. For 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * example, a 240x320 screen will have a density of 1 even if its width is 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1.8", 1.3", etc. However, if the screen resolution is increased to 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 320x480 but the screen size remained 1.5"x2" then the density would be 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * increased (probably to 1.5). 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 85a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn * @see #DENSITY_DEFAULT 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float density; 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8911ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn * The screen density expressed as dots-per-inch. May be either 9011ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn * {@link #DENSITY_LOW}, {@link #DENSITY_MEDIUM}, or {@link #DENSITY_HIGH}. 9111ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn */ 9211ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn public int densityDpi; 9311ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn /** 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A scaling factor for fonts displayed on the display. This is the same 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * as {@link #density}, except that it may be adjusted in smaller 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * increments at runtime based on a user preference for the font size. 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float scaledDensity; 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The exact physical pixels per inch of the screen in the X dimension. 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float xdpi; 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The exact physical pixels per inch of the screen in the Y dimension. 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float ydpi; 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 108e2515eebf42c763c0a2d9f873a153711778cfc17Dianne Hackborn /** @hide */ 109e2515eebf42c763c0a2d9f873a153711778cfc17Dianne Hackborn public int realWidthPixels; 110e2515eebf42c763c0a2d9f873a153711778cfc17Dianne Hackborn /** @hide */ 111e2515eebf42c763c0a2d9f873a153711778cfc17Dianne Hackborn public int realHeightPixels; 112e2515eebf42c763c0a2d9f873a153711778cfc17Dianne Hackborn 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public DisplayMetrics() { 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setTo(DisplayMetrics o) { 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project widthPixels = o.widthPixels; 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project heightPixels = o.heightPixels; 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project density = o.density; 12011ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn densityDpi = o.densityDpi; 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scaledDensity = o.scaledDensity; 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project xdpi = o.xdpi; 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ydpi = o.ydpi; 124e2515eebf42c763c0a2d9f873a153711778cfc17Dianne Hackborn realWidthPixels = o.realWidthPixels; 125e2515eebf42c763c0a2d9f873a153711778cfc17Dianne Hackborn realHeightPixels = o.realHeightPixels; 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setToDefaults() { 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project widthPixels = 0; 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project heightPixels = 0; 131a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn density = DENSITY_DEVICE / (float) DENSITY_DEFAULT; 13211ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn densityDpi = DENSITY_DEVICE; 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scaledDensity = density; 134a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn xdpi = DENSITY_DEVICE; 135a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn ydpi = DENSITY_DEVICE; 136e2515eebf42c763c0a2d9f873a153711778cfc17Dianne Hackborn realWidthPixels = 0; 137e2515eebf42c763c0a2d9f873a153711778cfc17Dianne Hackborn realHeightPixels = 0; 13858feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima } 13958feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima 14064f59342d41849bd365cb43fad7505d5e3daa417Mitsuru Oshima @Override 14158feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima public String toString() { 14258feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima return "DisplayMetrics{density=" + density + ", width=" + widthPixels + 14358feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima ", height=" + heightPixels + ", scaledDensity=" + scaledDensity + 14458feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima ", xdpi=" + xdpi + ", ydpi=" + ydpi + "}"; 14558feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima } 1462a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner 1472a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner private static int getDeviceDensity() { 1482a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner // qemu.sf.lcd_density can be used to override ro.sf.lcd_density 1492a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner // when running in the emulator, allowing for dynamic configurations. 1502a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner // The reason for this is that ro.sf.lcd_density is write-once and is 1512a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner // set by the init process when it parses build.prop before anything else. 1522a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner return SystemProperties.getInt("qemu.sf.lcd_density", 153a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn SystemProperties.getInt("ro.sf.lcd_density", DENSITY_DEFAULT)); 1542a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner } 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 156