Android Open Source - SpinList Fetch Data Task

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License

The source code is released under:

Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions...

Java Source Code

/*
 * Copyright 2012 Dmytro Titov//  w w  w . ja va 2s .co  m
 *
 * 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.github.dtitov.spinlist;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;

/**
 * Class for asynchronous launching the process of retrieving information over
 * HTTP. The fetching of data is processed on the background thread and the
 * result is passed to the UI thread.
 */
public class FetchDataTask extends AsyncTask<Void, Void, FbUser> {
    private LazyAdapter adapter;
    private int position;
    private String id;

    /**
     * Get LazyAdapter to work with.
     */
    public FetchDataTask(LazyAdapter adapter, int position) {
        this.adapter = adapter;
        this.position = position;
        this.id = (String) adapter.getItem(position);
    }

    /**
     * Background bitmap fetching and pasting it into FbUser.
     */
    @Override
    protected FbUser doInBackground(Void... params) {
        FbUser user = new FbUser(id);

        Bitmap bitmap = null;
        try {
            HttpURLConnection httpUrlConnection;
            httpUrlConnection = (HttpURLConnection) new java.net.URL(
                    user.getPicture()).openConnection();
            httpUrlConnection.setReadTimeout(10000);
            httpUrlConnection.setConnectTimeout(10000);
            InputStream inputStream = httpUrlConnection.getInputStream();
            BufferedInputStream bufferedInputStream = new BufferedInputStream(
                    inputStream);
            bitmap = BitmapFactory.decodeStream(bufferedInputStream);
            bufferedInputStream.close();
            inputStream.close();
            httpUrlConnection.disconnect();

        } catch (MalformedURLException e) {
        } catch (IOException e) {
        }

        user.setBitmap(bitmap);

        return user;
    }

    /**
     * Caching user after it's retrieving.
     */
    @Override
    protected void onPostExecute(FbUser result) {
        super.onPostExecute(result);
        adapter.cacheUser(result);

        //recursive call of an asynchronous task
        if (position < adapter.getCount() - 1) {
            new FetchDataTask(adapter, ++position).execute();
        }
    }
}

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