| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.util; |
| |
| import android.os.SystemProperties; |
| |
| |
| /** |
| * A structure describing general information about a display, such as its |
| * size, density, and font scaling. |
| * <p>To access the DisplayMetrics members, initialize an object like this:</p> |
| * <pre> DisplayMetrics metrics = new DisplayMetrics(); |
| * getWindowManager().getDefaultDisplay().getMetrics(metrics);</pre> |
| */ |
| public class DisplayMetrics { |
| /** |
| * Standard quantized DPI for low-density screens. |
| */ |
| public static final int DENSITY_LOW = 120; |
| |
| /** |
| * Standard quantized DPI for medium-density screens. |
| */ |
| public static final int DENSITY_MEDIUM = 160; |
| |
| /** |
| * Standard quantized DPI for 720p TV screens. Applications should |
| * generally not worry about this density, instead targeting |
| * {@link #DENSITY_XHIGH} for 1080p TV screens. For situations where |
| * output is needed for a 720p screen, the UI elements can be scaled |
| * automatically by the platform. |
| */ |
| public static final int DENSITY_TV = 213; |
| |
| /** |
| * Standard quantized DPI for high-density screens. |
| */ |
| public static final int DENSITY_HIGH = 240; |
| |
| /** |
| * Standard quantized DPI for extra-high-density screens. |
| */ |
| public static final int DENSITY_XHIGH = 320; |
| |
| /** |
| * The reference density used throughout the system. |
| */ |
| public static final int DENSITY_DEFAULT = DENSITY_MEDIUM; |
| |
| /** |
| * The device's density. |
| * @hide becase eventually this should be able to change while |
| * running, so shouldn't be a constant. |
| */ |
| public static final int DENSITY_DEVICE = getDeviceDensity(); |
| |
| /** |
| * The absolute width of the display in pixels. |
| */ |
| public int widthPixels; |
| /** |
| * The absolute height of the display in pixels. |
| */ |
| public int heightPixels; |
| /** |
| * The logical density of the display. This is a scaling factor for the |
| * Density Independent Pixel unit, where one DIP is one pixel on an |
| * approximately 160 dpi screen (for example a 240x320, 1.5"x2" screen), |
| * providing the baseline of the system's display. Thus on a 160dpi screen |
| * this density value will be 1; on a 120 dpi screen it would be .75; etc. |
| * |
| * <p>This value does not exactly follow the real screen size (as given by |
| * {@link #xdpi} and {@link #ydpi}, but rather is used to scale the size of |
| * the overall UI in steps based on gross changes in the display dpi. For |
| * example, a 240x320 screen will have a density of 1 even if its width is |
| * 1.8", 1.3", etc. However, if the screen resolution is increased to |
| * 320x480 but the screen size remained 1.5"x2" then the density would be |
| * increased (probably to 1.5). |
| * |
| * @see #DENSITY_DEFAULT |
| */ |
| public float density; |
| /** |
| * The screen density expressed as dots-per-inch. May be either |
| * {@link #DENSITY_LOW}, {@link #DENSITY_MEDIUM}, or {@link #DENSITY_HIGH}. |
| */ |
| public int densityDpi; |
| /** |
| * A scaling factor for fonts displayed on the display. This is the same |
| * as {@link #density}, except that it may be adjusted in smaller |
| * increments at runtime based on a user preference for the font size. |
| */ |
| public float scaledDensity; |
| /** |
| * The exact physical pixels per inch of the screen in the X dimension. |
| */ |
| public float xdpi; |
| /** |
| * The exact physical pixels per inch of the screen in the Y dimension. |
| */ |
| public float ydpi; |
| |
| /** |
| * The reported display width prior to any compatibility mode scaling |
| * being applied. |
| * @hide |
| */ |
| public int unscaledWidthPixels; |
| /** |
| * The reported display height prior to any compatibility mode scaling |
| * being applied. |
| * @hide |
| */ |
| public int unscaledHeightPixels; |
| |
| public DisplayMetrics() { |
| } |
| |
| public void setTo(DisplayMetrics o) { |
| widthPixels = o.widthPixels; |
| heightPixels = o.heightPixels; |
| density = o.density; |
| densityDpi = o.densityDpi; |
| scaledDensity = o.scaledDensity; |
| xdpi = o.xdpi; |
| ydpi = o.ydpi; |
| unscaledWidthPixels = o.unscaledWidthPixels; |
| unscaledHeightPixels = o.unscaledHeightPixels; |
| } |
| |
| public void setToDefaults() { |
| widthPixels = 0; |
| heightPixels = 0; |
| density = DENSITY_DEVICE / (float) DENSITY_DEFAULT; |
| densityDpi = DENSITY_DEVICE; |
| scaledDensity = density; |
| xdpi = DENSITY_DEVICE; |
| ydpi = DENSITY_DEVICE; |
| unscaledWidthPixels = 0; |
| unscaledHeightPixels = 0; |
| } |
| |
| @Override |
| public String toString() { |
| return "DisplayMetrics{density=" + density + ", width=" + widthPixels + |
| ", height=" + heightPixels + ", scaledDensity=" + scaledDensity + |
| ", xdpi=" + xdpi + ", ydpi=" + ydpi + "}"; |
| } |
| |
| private static int getDeviceDensity() { |
| // qemu.sf.lcd_density can be used to override ro.sf.lcd_density |
| // when running in the emulator, allowing for dynamic configurations. |
| // The reason for this is that ro.sf.lcd_density is write-once and is |
| // set by the init process when it parses build.prop before anything else. |
| return SystemProperties.getInt("qemu.sf.lcd_density", |
| SystemProperties.getInt("ro.sf.lcd_density", DENSITY_DEFAULT)); |
| } |
| } |