DisplayMetrics.java revision 58feea74b42bbaaa0552d76af23873bdd0b5dca2
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 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.os.*; 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. 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class DisplayMetrics { 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The reference density used throughout the system. 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @hide Pending API council approval 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static final int DEFAULT_DENSITY = 160; 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 342e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima /** 352e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima * The device's density. 362e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima * @hide 372e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima */ 382e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima public static final int DEVICE_DENSITY = SystemProperties.getInt("ro.sf.lcd_density", 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project DEFAULT_DENSITY); 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The absolute width of the display in pixels. 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int widthPixels; 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The absolute height of the display in pixels. 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int heightPixels; 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The logical density of the display. This is a scaling factor for the 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Density Independent Pixel unit, where one DIP is one pixel on an 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * approximately 160 dpi screen (for example a 240x320, 1.5"x2" screen), 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * providing the baseline of the system's display. Thus on a 160dpi screen 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * this density value will be 1; on a 106 dpi screen it would be .75; etc. 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This value does not exactly follow the real screen size (as given by 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link #xdpi} and {@link #ydpi}, but rather is used to scale the size of 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the overall UI in steps based on gross changes in the display dpi. For 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * example, a 240x320 screen will have a density of 1 even if its width is 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1.8", 1.3", etc. However, if the screen resolution is increased to 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 320x480 but the screen size remained 1.5"x2" then the density would be 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * increased (probably to 1.5). 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @see #DEFAULT_DENSITY 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float density; 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A scaling factor for fonts displayed on the display. This is the same 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * as {@link #density}, except that it may be adjusted in smaller 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * increments at runtime based on a user preference for the font size. 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float scaledDensity; 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The exact physical pixels per inch of the screen in the X dimension. 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float xdpi; 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The exact physical pixels per inch of the screen in the Y dimension. 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float ydpi; 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public DisplayMetrics() { 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setTo(DisplayMetrics o) { 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project widthPixels = o.widthPixels; 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project heightPixels = o.heightPixels; 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project density = o.density; 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scaledDensity = o.scaledDensity; 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project xdpi = o.xdpi; 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ydpi = o.ydpi; 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setToDefaults() { 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project widthPixels = 0; 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project heightPixels = 0; 972e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima density = DEVICE_DENSITY / (float) DEFAULT_DENSITY; 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scaledDensity = density; 992e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima xdpi = DEVICE_DENSITY; 1002e3d3b9ce74cb9c906e5cc0e9898d757d45c4237Mitsuru Oshima ydpi = DEVICE_DENSITY; 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10258feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima 10358feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima /** 10458feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima * Set the display metrics' density and update parameters depend on it. 10558feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima * @hide 10658feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima */ 10758feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima public void updateDensity(float newDensity) { 10858feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima float ratio = newDensity / density; 10958feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima density = newDensity; 11058feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima scaledDensity = density; 11158feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima widthPixels *= ratio; 11258feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima heightPixels *= ratio; 11358feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima xdpi *= ratio; 11458feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima ydpi *= ratio; 11558feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima } 11658feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima 11758feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima public String toString() { 11858feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima return "DisplayMetrics{density=" + density + ", width=" + widthPixels + 11958feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima ", height=" + heightPixels + ", scaledDensity=" + scaledDensity + 12058feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima ", xdpi=" + xdpi + ", ydpi=" + ydpi + "}"; 12158feea74b42bbaaa0552d76af23873bdd0b5dca2Mitsuru Oshima } 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 123