Android Open Source - WineDB Async Image Loader

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License

The source code is released under:

MIT License

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Java Source Code

package com.selesse.android.winedb.async;
/* w  ww .j a  va  2s . c  o  m*/
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.ImageView;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

public class AsyncImageLoader extends AsyncTask<String, Void, Bitmap> {
    private static final String TAG = AsyncImageLoader.class.getSimpleName();
    private final ImageView imageView;

    public AsyncImageLoader(ImageView imageView) {
        this.imageView = imageView;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();

        imageView.setImageBitmap(null);
    }

    @Override
    protected Bitmap doInBackground(String... strings) {
        String url = strings[0];

        BitmapFactory.Options bmOptions = new BitmapFactory.Options();
        bmOptions.inSampleSize = 1;
        return loadImage(url, bmOptions);
    }

    @Override
    protected void onPostExecute(Bitmap bitmap) {
        super.onPostExecute(bitmap);

        if (bitmap != null) {
            imageView.setImageBitmap(bitmap);
        }
    }

    private Bitmap loadImage(String imageUrl, BitmapFactory.Options options) {
        Bitmap bitmap = null;
        try {
            InputStream in = openHttpConnection(imageUrl);
            if (in == null) {
                return null;
            }
            bitmap = BitmapFactory.decodeStream(in, null, options);
            in.close();
        } catch (IOException e) {
            Log.e(TAG, "Error loading image " + imageUrl, e);
        }
        return bitmap;
    }

    private InputStream openHttpConnection(String streamUrl) {
        InputStream inputStream = null;
        try {
            URL url = new URL(streamUrl);
            URLConnection conn = url.openConnection();

            HttpURLConnection httpConn = (HttpURLConnection) conn;
            httpConn.setRequestMethod("GET");
            httpConn.connect();

            if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
                inputStream = httpConn.getInputStream();
            }

        } catch (IOException e) {
            Log.e(TAG, "Error fetching image " + streamUrl, e);
        }

        return inputStream;
    }
}

Java Source Code List