1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.android.internal.widget; 18 19 import android.annotation.Nullable; 20 import android.content.Context; 21 import android.graphics.Bitmap; 22 import android.graphics.BitmapFactory; 23 import android.graphics.drawable.BitmapDrawable; 24 import android.graphics.drawable.Drawable; 25 import android.net.Uri; 26 27 import java.io.IOException; 28 import java.io.InputStream; 29 30 /** 31 * A class to extract Bitmaps from a MessagingStyle message. 32 */ 33 public class LocalImageResolver { 34 35 private static final int MAX_SAFE_ICON_SIZE_PX = 480; 36 37 @Nullable resolveImage(Uri uri, Context context)38 public static Drawable resolveImage(Uri uri, Context context) throws IOException { 39 BitmapFactory.Options onlyBoundsOptions = getBoundsOptionsForImage(uri, context); 40 if ((onlyBoundsOptions.outWidth == -1) || (onlyBoundsOptions.outHeight == -1)) { 41 return null; 42 } 43 44 int originalSize = 45 (onlyBoundsOptions.outHeight > onlyBoundsOptions.outWidth) 46 ? onlyBoundsOptions.outHeight 47 : onlyBoundsOptions.outWidth; 48 49 double ratio = (originalSize > MAX_SAFE_ICON_SIZE_PX) 50 ? (originalSize / MAX_SAFE_ICON_SIZE_PX) 51 : 1.0; 52 53 BitmapFactory.Options bitmapOptions = new BitmapFactory.Options(); 54 bitmapOptions.inSampleSize = getPowerOfTwoForSampleRatio(ratio); 55 InputStream input = context.getContentResolver().openInputStream(uri); 56 Bitmap bitmap = BitmapFactory.decodeStream(input, null, bitmapOptions); 57 input.close(); 58 return new BitmapDrawable(context.getResources(), bitmap); 59 } 60 getBoundsOptionsForImage(Uri uri, Context context)61 private static BitmapFactory.Options getBoundsOptionsForImage(Uri uri, Context context) 62 throws IOException { 63 InputStream input = context.getContentResolver().openInputStream(uri); 64 BitmapFactory.Options onlyBoundsOptions = new BitmapFactory.Options(); 65 onlyBoundsOptions.inJustDecodeBounds = true; 66 BitmapFactory.decodeStream(input, null, onlyBoundsOptions); 67 input.close(); 68 return onlyBoundsOptions; 69 } 70 getPowerOfTwoForSampleRatio(double ratio)71 private static int getPowerOfTwoForSampleRatio(double ratio) { 72 int k = Integer.highestOneBit((int) Math.floor(ratio)); 73 return Math.max(1, k); 74 } 75 } 76