244 lines
9.1 KiB
Java
244 lines
9.1 KiB
Java
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.util;
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import android.content.res.CompatibilityInfo;
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import android.content.res.Configuration;
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import android.os.*;
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/**
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* A structure describing general information about a display, such as its
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* size, density, and font scaling.
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* <p>To access the DisplayMetrics members, initialize an object like this:</p>
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* <pre> DisplayMetrics metrics = new DisplayMetrics();
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* getWindowManager().getDefaultDisplay().getMetrics(metrics);</pre>
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*/
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public class DisplayMetrics {
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/**
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* Standard quantized DPI for low-density screens.
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*/
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public static final int DENSITY_LOW = 120;
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/**
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* Standard quantized DPI for medium-density screens.
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*/
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public static final int DENSITY_MEDIUM = 160;
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/**
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* Standard quantized DPI for high-density screens.
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*/
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public static final int DENSITY_HIGH = 240;
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/**
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* Standard quantized DPI for extra-high-density screens.
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*/
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public static final int DENSITY_XHIGH = 320;
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/**
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* The reference density used throughout the system.
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*/
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public static final int DENSITY_DEFAULT = DENSITY_MEDIUM;
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/**
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* The device's density.
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* @hide becase eventually this should be able to change while
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* running, so shouldn't be a constant.
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*/
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public static final int DENSITY_DEVICE = getDeviceDensity();
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/**
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* The absolute width of the display in pixels.
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*/
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public int widthPixels;
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/**
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* The absolute height of the display in pixels.
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*/
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public int heightPixels;
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/**
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* The logical density of the display. This is a scaling factor for the
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* Density Independent Pixel unit, where one DIP is one pixel on an
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* approximately 160 dpi screen (for example a 240x320, 1.5"x2" screen),
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* providing the baseline of the system's display. Thus on a 160dpi screen
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* this density value will be 1; on a 120 dpi screen it would be .75; etc.
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*
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* <p>This value does not exactly follow the real screen size (as given by
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* {@link #xdpi} and {@link #ydpi}, but rather is used to scale the size of
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* the overall UI in steps based on gross changes in the display dpi. For
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* example, a 240x320 screen will have a density of 1 even if its width is
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* 1.8", 1.3", etc. However, if the screen resolution is increased to
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* 320x480 but the screen size remained 1.5"x2" then the density would be
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* increased (probably to 1.5).
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*
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* @see #DENSITY_DEFAULT
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*/
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public float density;
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/**
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* The screen density expressed as dots-per-inch. May be either
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* {@link #DENSITY_LOW}, {@link #DENSITY_MEDIUM}, or {@link #DENSITY_HIGH}.
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*/
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public int densityDpi;
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/**
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* A scaling factor for fonts displayed on the display. This is the same
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* as {@link #density}, except that it may be adjusted in smaller
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* increments at runtime based on a user preference for the font size.
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*/
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public float scaledDensity;
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/**
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* The exact physical pixels per inch of the screen in the X dimension.
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*/
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public float xdpi;
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/**
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* The exact physical pixels per inch of the screen in the Y dimension.
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*/
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public float ydpi;
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public DisplayMetrics() {
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}
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public void setTo(DisplayMetrics o) {
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widthPixels = o.widthPixels;
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heightPixels = o.heightPixels;
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density = o.density;
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densityDpi = o.densityDpi;
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scaledDensity = o.scaledDensity;
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xdpi = o.xdpi;
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ydpi = o.ydpi;
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}
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public void setToDefaults() {
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widthPixels = 0;
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heightPixels = 0;
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density = DENSITY_DEVICE / (float) DENSITY_DEFAULT;
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densityDpi = DENSITY_DEVICE;
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scaledDensity = density;
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xdpi = DENSITY_DEVICE;
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ydpi = DENSITY_DEVICE;
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}
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/**
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* Update the display metrics based on the compatibility info and orientation
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* NOTE: DO NOT EXPOSE THIS API! It is introducing a circular dependency
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* with the higher-level android.res package.
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* {@hide}
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*/
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public void updateMetrics(CompatibilityInfo compatibilityInfo, int orientation,
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int screenLayout) {
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boolean expandable = compatibilityInfo.isConfiguredExpandable();
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boolean largeScreens = compatibilityInfo.isConfiguredLargeScreens();
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boolean xlargeScreens = compatibilityInfo.isConfiguredXLargeScreens();
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// Note: this assume that configuration is updated before calling
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// updateMetrics method.
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if (!expandable) {
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if ((screenLayout&Configuration.SCREENLAYOUT_COMPAT_NEEDED) == 0) {
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expandable = true;
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// the current screen size is compatible with non-resizing apps.
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compatibilityInfo.setExpandable(true);
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} else {
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compatibilityInfo.setExpandable(false);
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}
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}
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if (!largeScreens) {
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if ((screenLayout&Configuration.SCREENLAYOUT_SIZE_MASK)
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!= Configuration.SCREENLAYOUT_SIZE_LARGE) {
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largeScreens = true;
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// the current screen size is not large.
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compatibilityInfo.setLargeScreens(true);
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} else {
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compatibilityInfo.setLargeScreens(false);
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}
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}
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if (!xlargeScreens) {
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if ((screenLayout&Configuration.SCREENLAYOUT_SIZE_MASK)
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!= Configuration.SCREENLAYOUT_SIZE_XLARGE) {
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xlargeScreens = true;
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// the current screen size is not large.
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compatibilityInfo.setXLargeScreens(true);
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} else {
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compatibilityInfo.setXLargeScreens(false);
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}
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}
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if (!expandable || (!largeScreens && !xlargeScreens)) {
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// This is a larger screen device and the app is not
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// compatible with large screens, so diddle it.
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// Figure out the compatibility width and height of the screen.
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int defaultWidth;
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int defaultHeight;
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switch (orientation) {
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case Configuration.ORIENTATION_LANDSCAPE: {
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defaultWidth = (int)(CompatibilityInfo.DEFAULT_PORTRAIT_HEIGHT * density +
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0.5f);
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defaultHeight = (int)(CompatibilityInfo.DEFAULT_PORTRAIT_WIDTH * density +
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0.5f);
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break;
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}
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case Configuration.ORIENTATION_PORTRAIT:
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case Configuration.ORIENTATION_SQUARE:
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default: {
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defaultWidth = (int)(CompatibilityInfo.DEFAULT_PORTRAIT_WIDTH * density +
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0.5f);
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defaultHeight = (int)(CompatibilityInfo.DEFAULT_PORTRAIT_HEIGHT * density +
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0.5f);
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break;
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}
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case Configuration.ORIENTATION_UNDEFINED: {
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// don't change
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return;
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}
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}
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if (defaultWidth < widthPixels) {
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// content/window's x offset in original pixels
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widthPixels = defaultWidth;
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}
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if (defaultHeight < heightPixels) {
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heightPixels = defaultHeight;
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}
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}
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if (compatibilityInfo.isScalingRequired()) {
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float invertedRatio = compatibilityInfo.applicationInvertedScale;
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density *= invertedRatio;
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densityDpi = (int)((density*DisplayMetrics.DENSITY_DEFAULT)+.5f);
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scaledDensity *= invertedRatio;
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xdpi *= invertedRatio;
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ydpi *= invertedRatio;
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widthPixels = (int) (widthPixels * invertedRatio + 0.5f);
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heightPixels = (int) (heightPixels * invertedRatio + 0.5f);
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}
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}
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@Override
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public String toString() {
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return "DisplayMetrics{density=" + density + ", width=" + widthPixels +
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", height=" + heightPixels + ", scaledDensity=" + scaledDensity +
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", xdpi=" + xdpi + ", ydpi=" + ydpi + "}";
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}
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private static int getDeviceDensity() {
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// qemu.sf.lcd_density can be used to override ro.sf.lcd_density
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// when running in the emulator, allowing for dynamic configurations.
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// The reason for this is that ro.sf.lcd_density is write-once and is
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// set by the init process when it parses build.prop before anything else.
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return SystemProperties.getInt("qemu.sf.lcd_density",
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SystemProperties.getInt("ro.sf.lcd_density", DENSITY_DEFAULT));
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}
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}
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