| /* |
| * 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.content.res.CompatibilityInfo; |
| import android.content.res.Configuration; |
| import android.os.*; |
| |
| |
| /** |
| * 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 high-density screens. |
| */ |
| public static final int DENSITY_HIGH = 240; |
| |
| /** |
| * 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; |
| |
| 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; |
| } |
| |
| public void setToDefaults() { |
| widthPixels = 0; |
| heightPixels = 0; |
| density = DENSITY_DEVICE / (float) DENSITY_DEFAULT; |
| densityDpi = DENSITY_DEVICE; |
| scaledDensity = density; |
| xdpi = DENSITY_DEVICE; |
| ydpi = DENSITY_DEVICE; |
| } |
| |
| /** |
| * Update the display metrics based on the compatibility info and orientation |
| * NOTE: DO NOT EXPOSE THIS API! It is introducing a circular dependency |
| * with the higher-level android.res package. |
| * {@hide} |
| */ |
| public void updateMetrics(CompatibilityInfo compatibilityInfo, int orientation, |
| int screenLayout) { |
| boolean expandable = compatibilityInfo.isConfiguredExpandable(); |
| boolean largeScreens = compatibilityInfo.isConfiguredLargeScreens(); |
| boolean xlargeScreens = compatibilityInfo.isConfiguredXLargeScreens(); |
| |
| // Note: this assume that configuration is updated before calling |
| // updateMetrics method. |
| if (!expandable) { |
| if ((screenLayout&Configuration.SCREENLAYOUT_COMPAT_NEEDED) == 0) { |
| expandable = true; |
| // the current screen size is compatible with non-resizing apps. |
| compatibilityInfo.setExpandable(true); |
| } else { |
| compatibilityInfo.setExpandable(false); |
| } |
| } |
| if (!largeScreens) { |
| if ((screenLayout&Configuration.SCREENLAYOUT_SIZE_MASK) |
| != Configuration.SCREENLAYOUT_SIZE_LARGE) { |
| largeScreens = true; |
| // the current screen size is not large. |
| compatibilityInfo.setLargeScreens(true); |
| } else { |
| compatibilityInfo.setLargeScreens(false); |
| } |
| } |
| if (!xlargeScreens) { |
| if ((screenLayout&Configuration.SCREENLAYOUT_SIZE_MASK) |
| != Configuration.SCREENLAYOUT_SIZE_XLARGE) { |
| xlargeScreens = true; |
| // the current screen size is not large. |
| compatibilityInfo.setXLargeScreens(true); |
| } else { |
| compatibilityInfo.setXLargeScreens(false); |
| } |
| } |
| |
| if (!expandable || (!largeScreens && !xlargeScreens)) { |
| // This is a larger screen device and the app is not |
| // compatible with large screens, so diddle it. |
| |
| // Figure out the compatibility width and height of the screen. |
| int defaultWidth; |
| int defaultHeight; |
| switch (orientation) { |
| case Configuration.ORIENTATION_LANDSCAPE: { |
| defaultWidth = (int)(CompatibilityInfo.DEFAULT_PORTRAIT_HEIGHT * density + |
| 0.5f); |
| defaultHeight = (int)(CompatibilityInfo.DEFAULT_PORTRAIT_WIDTH * density + |
| 0.5f); |
| break; |
| } |
| case Configuration.ORIENTATION_PORTRAIT: |
| case Configuration.ORIENTATION_SQUARE: |
| default: { |
| defaultWidth = (int)(CompatibilityInfo.DEFAULT_PORTRAIT_WIDTH * density + |
| 0.5f); |
| defaultHeight = (int)(CompatibilityInfo.DEFAULT_PORTRAIT_HEIGHT * density + |
| 0.5f); |
| break; |
| } |
| case Configuration.ORIENTATION_UNDEFINED: { |
| // don't change |
| return; |
| } |
| } |
| |
| if (defaultWidth < widthPixels) { |
| // content/window's x offset in original pixels |
| widthPixels = defaultWidth; |
| } |
| if (defaultHeight < heightPixels) { |
| heightPixels = defaultHeight; |
| } |
| } |
| |
| if (compatibilityInfo.isScalingRequired()) { |
| float invertedRatio = compatibilityInfo.applicationInvertedScale; |
| density *= invertedRatio; |
| densityDpi = (int)((density*DisplayMetrics.DENSITY_DEFAULT)+.5f); |
| scaledDensity *= invertedRatio; |
| xdpi *= invertedRatio; |
| ydpi *= invertedRatio; |
| widthPixels = (int) (widthPixels * invertedRatio + 0.5f); |
| heightPixels = (int) (heightPixels * invertedRatio + 0.5f); |
| } |
| } |
| |
| @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)); |
| } |
| } |