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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.gallery3d.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.view.Gravity;
     24 import android.widget.Toast;
     25 
     26 import com.android.gallery3d.R;
     27 
     28 /**
     29  * Asynchronous task for loading source photo screennail.
     30  */
     31 public class LoadScreennailTask extends AsyncTask<Uri, Void, Bitmap> {
     32 
     33     /**
     34      * Callback for the completed asynchronous task.
     35      */
     36     public interface Callback {
     37 
     38         void onComplete(Bitmap result);
     39     }
     40 
     41     private static final int SCREENNAIL_WIDTH = 1280;
     42     private static final int SCREENNAIL_HEIGHT = 960;
     43 
     44     private final Context context;
     45     private final Callback callback;
     46 
     47     public LoadScreennailTask(Context context, Callback callback) {
     48         this.context = context;
     49         this.callback = callback;
     50     }
     51 
     52     /**
     53      * The task should be executed with one given source photo uri.
     54      */
     55     @Override
     56     protected Bitmap doInBackground(Uri... params) {
     57         if (params[0] == null) {
     58             return null;
     59         }
     60         return new BitmapUtils(context).getBitmap(params[0], SCREENNAIL_WIDTH, SCREENNAIL_HEIGHT);
     61     }
     62 
     63     @Override
     64     protected void onPostExecute(Bitmap result) {
     65         if (result == null) {
     66             Toast toast = Toast.makeText(context, R.string.loading_failure, Toast.LENGTH_SHORT);
     67             toast.setGravity(Gravity.CENTER, 0, 0);
     68             toast.show();
     69         }
     70         callback.onComplete(result);
     71     }
     72 }
     73