Using DownloadManager to download files in Android

DownloadActivity.java

package app.test;

import android.app.Activity;
import android.app.DownloadManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

public class Test extends Activity {
    protected static final String TAG = "DownloadMgr";
  private DownloadManager dMgr;
  private TextView tv;
  private long downloadId;

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

        tv = (TextView)findViewById(R.id.tv);
    }

    @Override
    protected void onResume() {
      super.onResume();
      dMgr = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
    }

    public void doClick(View view) {
      DownloadManager.Request dmReq = new DownloadManager.Request(
            Uri.parse("http://aBigFile.zip"));
      dmReq.setTitle("Platform Tools");
      dmReq.setDescription("Download for Linux");
      dmReq.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE);

        IntentFilter filter = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
        registerReceiver(mReceiver, filter);
      downloadId = dMgr.enqueue(dmReq);
      tv.setText("Download started... (" + downloadId + ")");
    }

    public BroadcastReceiver mReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            Bundle extras = intent.getExtras();
            long doneDownloadId =
              extras.getLong(DownloadManager.EXTRA_DOWNLOAD_ID);
            tv.setText(tv.getText() + "\nDownload finished (" +
              doneDownloadId + ")");
            if(downloadId == doneDownloadId)
                Log.v(TAG, "Our download has completed.");
        }
    };

    @Override
    protected void onPause() {
      super.onPause();
      unregisterReceiver(mReceiver);
      dMgr = null;
    }
}