1 /* 2 * Copyright (C) 2012 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.filtershow.tools; 18 19 import android.graphics.Bitmap; 20 import android.os.AsyncTask; 21 22 /** 23 * Asynchronous task filtering or doign I/O with bitmaps. 24 */ 25 public class BitmapTask <T> extends AsyncTask<T, Void, Bitmap> { 26 27 private Callbacks<T> mCallbacks; 28 private static final String LOGTAG = "BitmapTask"; 29 30 public BitmapTask(Callbacks<T> callbacks) { 31 mCallbacks = callbacks; 32 } 33 34 @Override 35 protected Bitmap doInBackground(T... params) { 36 if (params == null || mCallbacks == null) { 37 return null; 38 } 39 return mCallbacks.onExecute(params[0]); 40 } 41 42 @Override 43 protected void onPostExecute(Bitmap result) { 44 if (mCallbacks == null) { 45 return; 46 } 47 mCallbacks.onComplete(result); 48 } 49 50 @Override 51 protected void onCancelled() { 52 if (mCallbacks == null) { 53 return; 54 } 55 mCallbacks.onCancel(); 56 } 57 58 /** 59 * Callbacks for the asynchronous task. 60 */ 61 public interface Callbacks<P> { 62 void onComplete(Bitmap result); 63 64 void onCancel(); 65 66 Bitmap onExecute(P param); 67 } 68 } 69
