src/com/android/gallery3d/photoeditor/LoadScreennailTask.java

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.gallery3d.photoeditor;

import android.content.Context;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.AsyncTask;
import android.view.Gravity;
import android.widget.Toast;

import com.android.gallery3d.R;

/**
 * Asynchronous task for loading source photo screennail.
 */
public class LoadScreennailTask extends AsyncTask<Uri, Void, Bitmap> {

    /**
     * Callback for the completed asynchronous task.
     */
    public interface Callback {

        void onComplete(Bitmap result);
    }

    private static final int SCREENNAIL_WIDTH = 1280;
    private static final int SCREENNAIL_HEIGHT = 960;

    private final Context context;
    private final Callback callback;

    public LoadScreennailTask(Context context, Callback callback) {
        this.context = context;
        this.callback = callback;
    }

    /**
     * The task should be executed with one given source photo uri.
     */
    @Override
    protected Bitmap doInBackground(Uri... params) {
        if (params[0] == null) {
            return null;
        }
        return new BitmapUtils(context).getBitmap(params[0], SCREENNAIL_WIDTH, SCREENNAIL_HEIGHT);
    }

    @Override
    protected void onPostExecute(Bitmap result) {
        if (result == null) {
            Toast toast = Toast.makeText(context, R.string.loading_failure, Toast.LENGTH_SHORT);
            toast.setGravity(Gravity.CENTER, 0, 0);
            toast.show();
        }
        callback.onComplete(result);
    }
}