Home | History | Annotate | Download | only in widget 
      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.app.Notification;
     21 import android.content.Context;
     22 import android.graphics.Bitmap;
     23 import android.graphics.BitmapFactory;
     24 import android.graphics.drawable.BitmapDrawable;
     25 import android.graphics.drawable.Drawable;
     26 import android.net.Uri;
     27 
     28 import java.io.IOException;
     29 import java.io.InputStream;
     30 
     31 /**
     32  * A class to extract Bitmaps from a MessagingStyle message.
     33  */
     34 public class LocalImageResolver {
     35 
     36     private static final int MAX_SAFE_ICON_SIZE_PX = 480;
     37 
     38     @Nullable
     39     public static Drawable resolveImage(Uri uri, Context context) throws IOException {
     40         BitmapFactory.Options onlyBoundsOptions = getBoundsOptionsForImage(uri, context);
     41         if ((onlyBoundsOptions.outWidth == -1) || (onlyBoundsOptions.outHeight == -1)) {
     42             return null;
     43         }
     44 
     45         int originalSize =
     46                 (onlyBoundsOptions.outHeight > onlyBoundsOptions.outWidth)
     47                         ? onlyBoundsOptions.outHeight
     48                         : onlyBoundsOptions.outWidth;
     49 
     50         double ratio = (originalSize > MAX_SAFE_ICON_SIZE_PX)
     51                         ? (originalSize / MAX_SAFE_ICON_SIZE_PX)
     52                         : 1.0;
     53 
     54         BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
     55         bitmapOptions.inSampleSize = getPowerOfTwoForSampleRatio(ratio);
     56         InputStream input = context.getContentResolver().openInputStream(uri);
     57         Bitmap bitmap = BitmapFactory.decodeStream(input, null, bitmapOptions);
     58         input.close();
     59         return new BitmapDrawable(context.getResources(), bitmap);
     60     }
     61 
     62     private static BitmapFactory.Options getBoundsOptionsForImage(Uri uri, Context context)
     63             throws IOException {
     64         InputStream input = context.getContentResolver().openInputStream(uri);
     65         BitmapFactory.Options onlyBoundsOptions = new BitmapFactory.Options();
     66         onlyBoundsOptions.inJustDecodeBounds = true;
     67         BitmapFactory.decodeStream(input, null, onlyBoundsOptions);
     68         input.close();
     69         return onlyBoundsOptions;
     70     }
     71 
     72     private static int getPowerOfTwoForSampleRatio(double ratio) {
     73         int k = Integer.highestOneBit((int) Math.floor(ratio));
     74         return Math.max(1, k);
     75     }
     76 }
     77