| // Copyright 2017 The Cobalt Authors. All Rights Reserved. |
| // |
| // 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 dev.cobalt.util; |
| |
| import android.app.Activity; |
| import android.content.Context; |
| import android.util.DisplayMetrics; |
| import android.util.Size; |
| import android.util.SizeF; |
| import android.view.Display; |
| import android.view.WindowManager; |
| import androidx.annotation.Nullable; |
| import androidx.annotation.RequiresApi; |
| |
| /** Utility functions for querying display attributes. */ |
| public class DisplayUtil { |
| |
| private DisplayUtil() {} |
| |
| private static Display defaultDisplay; |
| private static DisplayMetrics cachedDisplayMetrics = null; |
| |
| /** Returns the physical pixels per inch of the screen in the X and Y dimensions. */ |
| public static SizeF getDisplayDpi() { |
| DisplayMetrics metrics = getDisplayMetrics(); |
| return new SizeF(metrics.xdpi, metrics.ydpi); |
| } |
| |
| /** Returns the default display associated with a context. */ |
| @Nullable |
| public static Display getDefaultDisplay() { |
| synchronized (DisplayUtil.class) { |
| if (defaultDisplay != null && !defaultDisplay.isValid()) { |
| return null; |
| } |
| |
| return defaultDisplay; |
| } |
| } |
| |
| /** |
| * Cache the default display and display metrics, this will be triggered when a NativeActivity |
| * starts. |
| */ |
| public static void cacheDefaultDisplay(Context context) { |
| Display display = getDisplayFromContext(context); |
| synchronized (DisplayUtil.class) { |
| defaultDisplay = display; |
| cachedDisplayMetrics = ((Activity) context).getResources().getDisplayMetrics(); |
| } |
| } |
| |
| /** |
| * Returns the default display associated with a context. When API Level >= 30, pass {@link |
| * android.app.Activity} for the context parameter. |
| */ |
| @Nullable |
| public static Display getDisplayFromContext(Context context) { |
| if (context == null) { |
| return null; |
| } |
| if (android.os.Build.VERSION.SDK_INT >= 30) { |
| return getDefaultDisplayV30(context); |
| } else { |
| return getDefaultDisplayDeprecated(context); |
| } |
| } |
| |
| @Nullable |
| @SuppressWarnings("deprecation") |
| private static Display getDefaultDisplayDeprecated(Context context) { |
| WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); |
| return (wm == null) ? null : wm.getDefaultDisplay(); |
| } |
| |
| @Nullable |
| @RequiresApi(30) |
| private static Display getDefaultDisplayV30(Context context) { |
| return context.getDisplay(); |
| } |
| |
| /** |
| * Returns the size of the physical display size in pixels. |
| * |
| * <p>This differs from {@link #getSystemDisplaySize()} because it only uses {@link |
| * DisplayMetrics}. |
| */ |
| public static Size getDisplaySize() { |
| DisplayMetrics metrics = getDisplayMetrics(); |
| return new Size(metrics.widthPixels, metrics.heightPixels); |
| } |
| |
| /** |
| * Returns the size of the current physical display size in pixels. |
| * |
| * <p>This differs from {@link #getDisplaySize()} because it allows the system property |
| * "sys.display-size" to override {@link DisplayMetrics}. |
| */ |
| public static Size getSystemDisplaySize() { |
| Size widthAndHeightPx = getSystemDisplayWidthAndHeightPxInternal(); |
| if (widthAndHeightPx == null) { |
| widthAndHeightPx = getDisplaySize(); |
| } |
| return widthAndHeightPx; |
| } |
| |
| /** |
| * Returns the size of the current physical display size in pixels. or {@code null} if |
| * unavailable. |
| */ |
| private static Size getSystemDisplayWidthAndHeightPxInternal() { |
| final String displaySize = SystemPropertiesHelper.getString("sys.display-size"); |
| if (displaySize != null) { |
| final String[] widthAndHeightPx = displaySize.split("x"); |
| if (widthAndHeightPx.length == 2) { |
| try { |
| return new Size( |
| Integer.parseInt(widthAndHeightPx[0]), Integer.parseInt(widthAndHeightPx[1])); |
| } catch (NumberFormatException exception) { |
| // pass |
| } |
| } |
| } |
| return null; |
| } |
| |
| private static DisplayMetrics getDisplayMetrics() { |
| return cachedDisplayMetrics; |
| } |
| } |