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      1 /*
      2  * Copyright (C) 2010 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.photoeditor;
     18 
     19 import android.content.Context;
     20 import android.graphics.Bitmap;
     21 import android.net.Uri;
     22 import android.os.AsyncTask;
     23 import android.widget.Toast;
     24 
     25 /**
     26  * Asynchronous task for loading source photo screennail.
     27  */
     28 public class LoadScreennailTask extends AsyncTask<Uri, Void, Bitmap> {
     29 
     30     /**
     31      * Callback for the completed asynchronous task.
     32      */
     33     public interface Callback {
     34 
     35         void onComplete(Bitmap bitmap);
     36     }
     37 
     38     // TODO: Support 1280x960 once OOM is fixed.
     39     private static final int SCREENNAIL_WIDTH = 1024;
     40     private static final int SCREENNAIL_HEIGHT = 768;
     41 
     42     private final Context context;
     43     private final Callback callback;
     44 
     45     public LoadScreennailTask(Context context, Callback callback) {
     46         this.context = context;
     47         this.callback = callback;
     48     }
     49 
     50     /**
     51      * The task should be executed with one given source photo uri.
     52      */
     53     @Override
     54     protected Bitmap doInBackground(Uri... params) {
     55         if (params[0] == null) {
     56             return null;
     57         }
     58         return new BitmapUtils(context).getBitmap(params[0], SCREENNAIL_WIDTH, SCREENNAIL_HEIGHT);
     59     }
     60 
     61     @Override
     62     protected void onPostExecute(Bitmap bitmap) {
     63         if (bitmap == null) {
     64             Toast.makeText(context, R.string.loading_failure, Toast.LENGTH_SHORT).show();
     65         }
     66         callback.onComplete(bitmap);
     67     }
     68 }
     69