AsyncTaskLoaderを使った画像の読み込みクラス

ImageAsyncLoader.java

package jnet.kikuchy;

import android.support.v4.content.AsyncTaskLoader;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;

import java.io.InputStream;
import java.net.URL;


public class ImageAsyncLoader extends AsyncTaskLoader<Bitmap> {
    private static final String TAG = MainActivity.class.getSimpleName();

    private String mUrl;

    public ImageAsyncLoader(Context context, String url)
    {
        super(context);
        this.mUrl = url;
    }

    @Override
    public Bitmap loadInBackground() {
        Bitmap ret = null;
        try {
            URL url = new URL(this.mUrl);
            InputStream input = url.openStream();
            ret = BitmapFactory.decodeStream(input);
        }
        catch (Exception e)
        {
            Log.e(TAG, e.getMessage());
        }
        return ret;
    }

    @Override
    public void onStartLoading() {
        forceLoad();
    }
}