piramide.multimodal.downloader.client.ApplicationDownloader.java Source code

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Here is the source code for piramide.multimodal.downloader.client.ApplicationDownloader.java

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/*
 * Copyright (C) 2010 PIRAmIDE-SP3 authors
 *
 * 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.
 * 
 * This software consists of contributions made by many individuals, 
 * listed below:
 *
 * Author: Aitor Almeida <aitor.almeida@deusto.es>
 *         Pablo Ordua <pablo.orduna@deusto.es>
 *         Eduardo Castillejo <eduardo.castillejo@deusto.es>
 *
 */
package piramide.multimodal.downloader.client;

import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.content.Context;
import android.content.Intent;
import android.net.Uri;

public class ApplicationDownloader {

    private static final String APK_FILENAME = "application.apk";

    private final Context context;
    private final String url;

    ApplicationDownloader(Context context, String url) {
        this.context = context;
        this.url = url;
    }

    void download() throws DownloaderException {
        final HttpClient client = new DefaultHttpClient();
        try {
            final FileOutputStream fos = this.context.openFileOutput(APK_FILENAME, Context.MODE_WORLD_READABLE);
            final HttpResponse response = client.execute(new HttpGet(this.url));
            if (response.getStatusLine().getStatusCode() < 200 || response.getStatusLine().getStatusCode() >= 400) {
                throw new DownloaderException("Invalid status code downloading application: "
                        + response.getStatusLine().getReasonPhrase());
            }
            downloadFile(response, fos);
            fos.close();
        } catch (ClientProtocolException e) {
            throw new DownloaderException(e);
        } catch (IOException e) {
            throw new DownloaderException(e);
        }
    }

    void install() {
        final Intent intent = new Intent();
        intent.setAction(android.content.Intent.ACTION_VIEW);
        intent.setDataAndType(
                Uri.parse("file://" + this.context.getFilesDir().getAbsolutePath() + "/" + APK_FILENAME),
                "application/vnd.android.package-archive");
        this.context.startActivity(intent);
    }

    private void downloadFile(HttpResponse response, OutputStream os) throws IOException {
        final InputStream is = response.getEntity().getContent();
        long size = response.getEntity().getContentLength();
        BufferedInputStream bis = new BufferedInputStream(is);
        final byte[] buffer = new byte[1024 * 1024]; // 1 MB
        long position = 0;
        while (position < size) {
            final int read = bis.read(buffer, 0, buffer.length);
            if (read <= 0)
                break;

            os.write(buffer, 0, read);
            os.flush();

            position += read;
        }
        is.close();
    }

}