Android Open Source - CommonClasses Download Utils

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * This source is part of the CommonClasses repository.
 */*from  w  w  w.j  av a 2  s. com*/
 * Copyright 2014 Kevin Liu (airk908@gmail.com)
 *
 * CommonClasses is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * CommonClasses is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with CommonClasses.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.github.commonclasses.network;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;

import org.apache.http.Header;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;

/**
 * Network download tool
 * <p/>
 * Permission Needed
 * <p/>
 * <uses-permission android:name="android.permission.INTERNET" />
 */
public class DownloadUtils {
    private static final int CONNECT_TIMEOUT = 10000;
    private static final int DATA_TIMEOUT = 40000;
    private final static int DATA_BUFFER = 8192;

    public interface DownloadListener {
        public void downloading(int progress);

        public void downloaded(File dest);

        public void exception(Exception e);
    }

    public static long download(String urlStr, File dest, boolean append, DownloadListener downloadListener) throws Exception {
        int downloadProgress = 0;
        long remoteSize = 0;
        int currentSize = 0;
        long totalSize = -1;

        if (!append && dest.exists() && dest.isFile()) {
            dest.delete();
        }

        if (append && dest.exists() && dest.exists()) {
            FileInputStream fis = null;
            try {
                fis = new FileInputStream(dest);
                currentSize = fis.available();
            } catch (IOException e) {
                throw e;
            } finally {
                if (fis != null) {
                    fis.close();
                }
            }
        }

        HttpGet request = new HttpGet(urlStr);
        request.setHeader("Content-Type", "application/x-www-form-urlencoded");

        if (currentSize > 0) {
            request.addHeader("RANGE", "bytes=" + currentSize + "-");
        }

        HttpParams params = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(params, CONNECT_TIMEOUT);
        HttpConnectionParams.setSoTimeout(params, DATA_TIMEOUT);
        HttpClient httpClient = new DefaultHttpClient(params);

        InputStream is = null;
        FileOutputStream os = null;
        try {
            HttpResponse response = httpClient.execute(request);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                is = response.getEntity().getContent();
                remoteSize = response.getEntity().getContentLength();
                Header contentEncoding = response.getFirstHeader("Content-Encoding");
                if (contentEncoding != null && contentEncoding.getValue().equalsIgnoreCase("gzip")) {
                    is = new GZIPInputStream(is);
                }
                os = new FileOutputStream(dest, append);
                byte buffer[] = new byte[DATA_BUFFER];
                int readSize = 0;
                while ((readSize = is.read(buffer)) > 0) {
                    os.write(buffer, 0, readSize);
                    os.flush();
                    totalSize += readSize;
                    if (downloadListener != null) {
                        downloadProgress = (int) (totalSize * 100 / remoteSize);
                        downloadListener.downloading(downloadProgress);
                    }
                }
                if (totalSize < 0) {
                    totalSize = 0;
                }
            }
        } catch (Exception e) {
            if (downloadListener != null) {
                downloadListener.exception(e);
            }
            e.printStackTrace();
        } finally {
            if (os != null) {
                os.close();
            }
            if (is != null) {
                is.close();
            }
        }

        if (totalSize < 0) {
            throw new Exception("Download file fail: " + urlStr);
        }

        if (downloadListener != null) {
            downloadListener.downloaded(dest);
        }

        return totalSize;
    }
}

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