Android Download and Unzip File

Decompress.java

package com.jumpbyte.webserver;

import android.content.Context;
import android.util.Log;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

/**
 *
 * @author dhaval nagar
 */
public class Decompress {
    private File _zipFile;
    private InputStream _zipFileStream;
    private Context context;
    private static final String ROOT_LOCATION = "/sdcard";
    private static final String TAG = "UNZIPUTIL";

    public Decompress(Context context, File zipFile) {
        _zipFile = zipFile;
        this.context = context;

        _dirChecker("");
    }

    public Decompress(Context context, InputStream zipFile) {
        _zipFileStream = zipFile;
        this.context = context;

        _dirChecker("");
    }

    public void unzip() {
        try  {
            Log.i(TAG, "Starting to unzip");
            InputStream fin = _zipFileStream;
            if(fin == null) {
                fin = new FileInputStream(_zipFile);
            }
            ZipInputStream zin = new ZipInputStream(fin);
            ZipEntry ze = null;
            while ((ze = zin.getNextEntry()) != null) {
                Log.v(TAG, "Unzipping " + ze.getName());

                if(ze.isDirectory()) {
                    _dirChecker(ROOT_LOCATION + "/" + ze.getName());
                } else {
                    FileOutputStream fout = new FileOutputStream(new File(ROOT_LOCATION, ze.getName()));
                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
                    byte[] buffer = new byte[1024];
                    int count;

                    // reading and writing
                    while((count = zin.read(buffer)) != -1)
                    {
                        baos.write(buffer, 0, count);
                        byte[] bytes = baos.toByteArray();
                        fout.write(bytes);
                        baos.reset();
                    }

                    fout.close();
                    zin.closeEntry();
                }

            }
            zin.close();
            Log.i(TAG, "Finished unzip");
        } catch(Exception e) {
            Log.e(TAG, "Unzip Error", e);
        }

    }

    private void _dirChecker(String dir) {
        File f = new File(dir);
        Log.i(TAG, "creating dir " + dir);

        if(dir.length() >= 0 && !f.isDirectory() ) {
            f.mkdirs();
        }
    }
}

DownloadFileAsync.java

package com.jumpbyte.webserver;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.util.Log;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;

/**
 * Created by dhavalnagar on 03/02/15.
 */
public class DownloadFileAsync extends AsyncTask<String, String, String> {

    private static final String TAG ="DOWNLOADFILE";

    public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
    private PostDownload callback;
    private Context context;
    private FileDescriptor fd;
    private File file;
    private String downloadLocation;

    public DownloadFileAsync(String downloadLocation, Context context, PostDownload callback){
        this.context = context;
        this.callback = callback;
        this.downloadLocation = downloadLocation;
    }
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(String... aurl) {
        int count;

        try {
            URL url = new URL(aurl[0]);
            URLConnection connection = url.openConnection();
            connection.connect();

            int lenghtOfFile = connection.getContentLength();
            Log.d(TAG, "Length of the file: " + lenghtOfFile);

            InputStream input = new BufferedInputStream(url.openStream());
            file = new File(downloadLocation);
            FileOutputStream output = new FileOutputStream(file); //context.openFileOutput("content.zip", Context.MODE_PRIVATE);
            Log.d(TAG, "file saved at " + file.getAbsolutePath());
            fd = output.getFD();

            byte data[] = new byte[1024];
            long total = 0;
            while ((count = input.read(data)) != -1) {
                total += count;
                publishProgress(""+(int)((total*100)/lenghtOfFile));
                output.write(data, 0, count);
            }

            output.flush();
            output.close();
            input.close();
        } catch (Exception e) {}
        return null;

    }
    protected void onProgressUpdate(String... progress) {
        //Log.d(TAG,progress[0]);
    }

    @Override
    protected void onPostExecute(String unused) {
        if(callback != null) callback.downloadDone(file);
    }

    public static interface PostDownload{
        void downloadDone(File fd);
    }
}

TestActivity.java

@Override
public void onCreate(Bundle savedInstanceState){
    Button downloadContent = (Button) findViewById(R.id.downloadContent);
    downloadContent.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            downloadAndUnzipContent();
        }
    });
}

private void downloadAndUnzipContent(){
    String url = "https://github.com/NanoHttpd/nanohttpd/archive/master.zip";
    DownloadFileAsync download = new DownloadFileAsync("/sdcard/content.zip", this, new DownloadFileAsync.PostDownload(){
        @Override
        public void downloadDone(File file) {
            Log.i(TAG, "file download completed");

            // check unzip file now
            Decompress unzip = new Decompress(Home.this, file);
            unzip.unzip();

            Log.i(TAG, "file unzip completed");
        }
    });
    download.execute(url);
}

E/UNZIPUTIL: Unzip Error
java.io.FileNotFoundException: /nanohttpd-master/.gitignore (No such file or directory)
at java.io.FileOutputStream.open0(Native Method)
at java.io.FileOutputStream.open(FileOutputStream.java:308)
at java.io.FileOutputStream.(FileOutputStream.java:238)
at java.io.FileOutputStream.(FileOutputStream.java:180)
at com.example.ipscansearchcve.Decompress.unzip(Decompress.java:56)
at com.example.ipscansearchcve.MainActivity$1.downloadDone(MainActivity.java:72)
at com.example.ipscansearchcve.DownloadFileAsync.onPostExecute(DownloadFileAsync.java:81)
at com.example.ipscansearchcve.DownloadFileAsync.onPostExecute(DownloadFileAsync.java:21)
at android.os.AsyncTask.finish(AsyncTask.java:695)
at android.os.AsyncTask.access$600(AsyncTask.java:180)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

I have this errors...... plz help me.................