malcoauri malcoauri - 1 month ago 14
Android Question

Code for download video from Youtube on Java, Android

I created code for download video from Youtube, but this code doesn't work with Wi-fi connection and work with mobile connection. Where did I have mistake?

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Enumeration;
import java.util.Vector;

import android.app.Activity;
import android.app.ProgressDialog;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.MediaController;
import android.widget.VideoView;

public class MyActivity extends Activity {

private class ReceivingDataFromYoutube extends AsyncTask<String, Void, Void> {

private ProgressDialog dialog = new ProgressDialog(MyActivity.this);
private String result;

protected void onPreExecute() {
dialog.setMessage("Downloading...");
dialog.show();
}

@Override
protected Void doInBackground(String... arg0) {
int begin, end;
String tmpstr = null;
try {
URL url=new URL("http://www.youtube.com/watch?v=y12-1miZHLs&nomobile=1");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");
InputStream stream=con.getInputStream();
InputStreamReader reader=new InputStreamReader(stream);
StringBuffer buffer=new StringBuffer();
char[] buf=new char[262144];
int chars_read;
while ((chars_read = reader.read(buf, 0, 262144)) != -1) {
buffer.append(buf, 0, chars_read);
}
tmpstr=buffer.toString();

begin = tmpstr.indexOf("url_encoded_fmt_stream_map=");
end = tmpstr.indexOf("&", begin + 27);
if (end == -1) {
end = tmpstr.indexOf("\"", begin + 27);
}
tmpstr = UtilClass.URLDecode(tmpstr.substring(begin + 27, end));

} catch (MalformedURLException e) {
throw new RuntimeException();
} catch (IOException e) {
throw new RuntimeException();
}

Vector url_encoded_fmt_stream_map = new Vector();
begin = 0;
end = tmpstr.indexOf(",");

while (end != -1) {
url_encoded_fmt_stream_map.addElement(tmpstr.substring(begin, end));
begin = end + 1;
end = tmpstr.indexOf(",", begin);
}

url_encoded_fmt_stream_map.addElement(tmpstr.substring(begin, tmpstr.length()));
String result = "";
Enumeration url_encoded_fmt_stream_map_enum = url_encoded_fmt_stream_map.elements();
while (url_encoded_fmt_stream_map_enum.hasMoreElements()) {
tmpstr = (String)url_encoded_fmt_stream_map_enum.nextElement();
begin = tmpstr.indexOf("itag=");
if (begin != -1) {
end = tmpstr.indexOf("&", begin + 5);

if (end == -1) {
end = tmpstr.length();
}

int fmt = Integer.parseInt(tmpstr.substring(begin + 5, end));

if (fmt == 35) {
begin = tmpstr.indexOf("url=");
if (begin != -1) {
end = tmpstr.indexOf("&", begin + 4);
if (end == -1) {
end = tmpstr.length();
}
result = UtilClass.URLDecode(tmpstr.substring(begin + 4, end));
this.result=result;
break;
}
}
}
}
try {
URL u = new URL(result);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
/* c.setRequestProperty("Youtubedl-no-compression", "True");
c.setRequestProperty("User-Agent", "YouTube");*/

c.setDoOutput(true);
c.connect();

FileOutputStream f=new FileOutputStream(new File("/sdcard/3.flv"));

InputStream in=c.getInputStream();
byte[] buffer=new byte[1024];
int sz = 0;
while ( (sz = in.read(buffer)) > 0 ) {
f.write(buffer,0, sz);
}
f.close();
} catch (MalformedURLException e) {
new RuntimeException();
} catch (IOException e) {
new RuntimeException();
}
return null;
}

protected void onPostExecute(Void unused) {
dialog.dismiss();
}

}


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

new ReceivingDataFromYoutube().execute();
}
}

Answer

3 steps:

  1. Check the sorce code (HTML) of YouTube, you'll get the link like this (http%253A%252F%252Fo-o.preferred.telemar-cnf1.v18.lscache6.c.youtube.com%252Fvideoplayback ...);

  2. Decode the url (remove the codes %2B,%25 etc), create a decoder with the codes: http://www.w3schools.com/tags/ref_urlencode.asp and use the function Uri.decode(url) to replace invalid escaped octets;

  3. Use the code to download stream:

    URL u = null;
    InputStream is = null;  
    
    try {
        u = new URL(url);
        is = u.openStream(); 
        HttpURLConnection huc = (HttpURLConnection)u.openConnection(); //to know the size of video
        int size = huc.getContentLength();                 
    
        if(huc != null) {
            String fileName = "FILE.mp4";
            String storagePath = Environment.getExternalStorageDirectory().toString();
            File f = new File(storagePath,fileName);
    
            FileOutputStream fos = new FileOutputStream(f);
            byte[] buffer = new byte[1024];
            int len1 = 0;
            if(is != null) {
                while ((len1 = is.read(buffer)) > 0) {
                    fos.write(buffer,0, len1);  
                }
            }
            if(fos != null) {
                fos.close();
            }
        }                       
    } catch (MalformedURLException mue) {
        mue.printStackTrace();
    } catch (IOException ioe) {
        ioe.printStackTrace();
    } finally {
        try {               
            if(is != null) {
                is.close();
            }
        } catch (IOException ioe) {
            // just going to ignore this one
        }
    }
    

That's all, most of stuff you'll find on the web!!!