link ile video in

package com.example.mustafa16.indirme2;

import android.support.v7.app.ActionBarActivity;
import android.app.DownloadManager;
import android.app.DownloadManager.Query;
import android.app.DownloadManager.Request;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.database.Cursor;
import android.app.DownloadManager.Request;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

    DownloadManager dManager;
    TextView tvMessage;
    EditText urlInput;
    long did;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Get DownloadManager instance
        dManager=(DownloadManager)this.getSystemService(Context.DOWNLOAD_SERVICE);
        tvMessage=(TextView)findViewById(R.id.txtmessage);
        urlInput=(EditText)findViewById(R.id.txturl);
    }

    public void downloadFile(View view){

        String urlString=urlInput.getText().toString();
        if(!urlString.equals("")){
            try{
                // Get file name from the url
                String fileName=urlString.substring(urlString.lastIndexOf("/")+1);
                // Create Download Request object
                DownloadManager.Request request=new DownloadManager.Request(Uri.parse((urlString)));
                // Display download progress and status message in notification bar
                request.setNotificationVisibility(Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                // Set description to display in notification
                request.setDescription("Download "+fileName+" from "+ urlString);
                // Set title
                request.setTitle("DownloadManager");
                // Set destination location for the downloaded file
                request.setDestinationUri(Uri.parse("file://"+Environment.getExternalStorageDirectory()+"/"+fileName));
                // Download the file if the Download manager is ready
                did=dManager.enqueue(request);

            }catch(Exception e){}

        }


    }
    // BroadcastReceiver to receive intent broadcast by DownloadManager
    private BroadcastReceiver downloadReceiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context arg0, Intent arg1) {
            // TODO Auto-generated method stub
            Query q = new Query();
            q.setFilterById(did);
            Cursor cursor = dManager.query(q);
            if(cursor.moveToFirst()){
                String message="";
                int status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));
                if(status==DownloadManager.STATUS_SUCCESSFUL){
                    message="Download successful";
                }
                else if(status==DownloadManager.STATUS_FAILED){
                    message="Download failed";
                }
                tvMessage.setText(message);
            }


        }
    };
    protected void onResume(){
        super.onResume();
        // Register the receiver to receive an intent when download complete
        IntentFilter intentFilter= new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
        registerReceiver(downloadReceiver, intentFilter);
    }
    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        // Unregister the receiver
        unregisterReceiver(downloadReceiver);
    }

}

Arkadaşlar Android download manager uygulaması yapmak istiyorum bir edittex 1de buton koydum edittexe yapıştırılan mp3 jpg vs gibi uzantılı linklerdekileri indiriyor fakat örneğin facebookta bir resim linkini kopyalayıp yapıştırdığımda sonunda jpg .png gibi link uzantısı olmadığından sitenin html görünümünü indiriyor

bunu nasıl çözebilirim uygulama genel olarak film indirme ve facebook video indirme uygulamasıdır sadece bir site üzerinden filmde indirtebilirim mp4. mov gibi uzantıları nasıl bulabilirim