DisplayMetrics.java revision b96cbbd11c4590bec846212c33361e02293f18b5
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 /** 41b96cbbd11c4590bec846212c33361e02293f18b5Dianne Hackborn * Standard quantized DPI for 720p TV screens. Applications should 42b96cbbd11c4590bec846212c33361e02293f18b5Dianne Hackborn * generally not worry about this density, instead targeting 43b96cbbd11c4590bec846212c33361e02293f18b5Dianne Hackborn * {@link #DENSITY_XHIGH} for 1080p TV screens. For situations where 44b96cbbd11c4590bec846212c33361e02293f18b5Dianne Hackborn * output is needed for a 720p screen, the UI elements can be scaled 45b96cbbd11c4590bec846212c33361e02293f18b5Dianne Hackborn * automatically by the platform. 46b96cbbd11c4590bec846212c33361e02293f18b5Dianne Hackborn */ 47b96cbbd11c4590bec846212c33361e02293f18b5Dianne Hackborn public static final int DENSITY_TV = 213; 48b96cbbd11c4590bec846212c33361e02293f18b5Dianne Hackborn 49b96cbbd11c4590bec846212c33361e02293f18b5Dianne Hackborn /** 50a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn * Standard quantized DPI for high-density screens. 51a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn */ 52a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn public static final int DENSITY_HIGH = 240; 53a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn 54a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn /** 55a0b46c9c441f017a2008ca8ee2c864987465996bDianne Hackborn * Standard quantized DPI for extra-high-density screens. 56a0b46c9c441f017a2008ca8ee2c864987465996bDianne Hackborn */ 57a0b46c9c441f017a2008ca8ee2c864987465996bDianne Hackborn public static final int DENSITY_XHIGH = 320; 58a0b46c9c441f017a2008ca8ee2c864987465996bDianne Hackborn 59a0b46c9c441f017a2008ca8ee2c864987465996bDianne Hackborn /** 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The reference density used throughout the system. 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 62a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn public static final int DENSITY_DEFAULT = DENSITY_MEDIUM; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 642e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima /** 652e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima * The device's density. 66a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn * @hide becase eventually this should be able to change while 67a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn * running, so shouldn't be a constant. 682e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima */ 69a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn public static final int DENSITY_DEVICE = getDeviceDensity(); 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The absolute width of the display in pixels. 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int widthPixels; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The absolute height of the display in pixels. 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int heightPixels; 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The logical density of the display. This is a scaling factor for the 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Density Independent Pixel unit, where one DIP is one pixel on an 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * approximately 160 dpi screen (for example a 240x320, 1.5"x2" screen), 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * providing the baseline of the system's display. Thus on a 160dpi screen 846b13bc043e715b5415b701e93141daa0d49fa364Dirk Dougherty * this density value will be 1; on a 120 dpi screen it would be .75; etc. 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This value does not exactly follow the real screen size (as given by 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link #xdpi} and {@link #ydpi}, but rather is used to scale the size of 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the overall UI in steps based on gross changes in the display dpi. For 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * example, a 240x320 screen will have a density of 1 even if its width is 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1.8", 1.3", etc. However, if the screen resolution is increased to 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 320x480 but the screen size remained 1.5"x2" then the density would be 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * increased (probably to 1.5). 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 94a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn * @see #DENSITY_DEFAULT 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float density; 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9811ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn * The screen density expressed as dots-per-inch. May be either 9911ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn * {@link #DENSITY_LOW}, {@link #DENSITY_MEDIUM}, or {@link #DENSITY_HIGH}. 10011ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn */ 10111ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn public int densityDpi; 10211ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn /** 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A scaling factor for fonts displayed on the display. This is the same 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * as {@link #density}, except that it may be adjusted in smaller 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * increments at runtime based on a user preference for the font size. 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float scaledDensity; 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The exact physical pixels per inch of the screen in the X dimension. 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float xdpi; 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The exact physical pixels per inch of the screen in the Y dimension. 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float ydpi; 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11781e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn /** 11881e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn * The reported display width prior to any compatibility mode scaling 11981e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn * being applied. 12081e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn * @hide 12181e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn */ 12281e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn public int unscaledWidthPixels; 12381e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn /** 12481e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn * The reported display height prior to any compatibility mode scaling 12581e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn * being applied. 12681e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn * @hide 12781e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn */ 12881e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn public int unscaledHeightPixels; 129e2515eebf42c763c0a2d9f873a153711778cfc17Dianne Hackborn 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public DisplayMetrics() { 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setTo(DisplayMetrics o) { 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project widthPixels = o.widthPixels; 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project heightPixels = o.heightPixels; 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project density = o.density; 13711ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn densityDpi = o.densityDpi; 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scaledDensity = o.scaledDensity; 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project xdpi = o.xdpi; 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ydpi = o.ydpi; 14181e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn unscaledWidthPixels = o.unscaledWidthPixels; 14281e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn unscaledHeightPixels = o.unscaledHeightPixels; 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setToDefaults() { 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project widthPixels = 0; 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project heightPixels = 0; 148a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn density = DENSITY_DEVICE / (float) DENSITY_DEFAULT; 14911ea33471e1a14a8594f0b2cd012d86340dd3bd8Dianne Hackborn densityDpi = DENSITY_DEVICE; 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scaledDensity = density; 151a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn xdpi = DENSITY_DEVICE; 152a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn ydpi = DENSITY_DEVICE; 15381e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn unscaledWidthPixels = 0; 15481e56d535c853d73ff537357da5b935f51cb779dDianne Hackborn unscaledHeightPixels = 0; 15558feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima } 15658feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima 15764f59342d41849bd365cb43fad7505d5e3daa417Mitsuru Oshima @Override 15858feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima public String toString() { 15958feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima return "DisplayMetrics{density=" + density + ", width=" + widthPixels + 16058feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima ", height=" + heightPixels + ", scaledDensity=" + scaledDensity + 16158feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima ", xdpi=" + xdpi + ", ydpi=" + ydpi + "}"; 16258feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima } 1632a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner 1642a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner private static int getDeviceDensity() { 1652a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner // qemu.sf.lcd_density can be used to override ro.sf.lcd_density 1662a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner // when running in the emulator, allowing for dynamic configurations. 1672a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner // The reason for this is that ro.sf.lcd_density is write-once and is 1682a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner // set by the init process when it parses build.prop before anything else. 1692a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner return SystemProperties.getInt("qemu.sf.lcd_density", 170a53b828635fce8b6b2d3e3377d74d72070056623Dianne Hackborn SystemProperties.getInt("ro.sf.lcd_density", DENSITY_DEFAULT)); 1712a578ae518ff3d8a2d4768b3d190e4702509e82cDavid 'Digit' Turner } 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 173