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Download Manager Demo

package app.test; import java.io.FileInputStream; import android.app.Activity; import android.app.DownloadManager; import android.app.DownloadManager.Request; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.database.Cursor; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Bundle; import android.os.ParcelFileDescriptor; import android.preference.PreferenceManager; import android.util.Log; import android.widget.ImageView; public class Test extends Activity {   private static final String DL_ID = "downloadId";   private SharedPreferences prefs;   private DownloadManager dm;   private ImageView imageView;        @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         imageView = new ImageView(this);         setContentView(imageView);         prefs = PreferenceManager.getDefaultSharedPreferences(this);         dm = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);     }     @Override     public void onResume() {       super.onResume();         if(!prefs.contains(DL_ID)) {           Uri resource = Uri.parse("http://asdf.com/big.jpg");           DownloadManager.Request request = new DownloadManager.Request(resource);           request.setAllowedNetworkTypes(Request.NETWORK_MOBILE | Request.NETWORK_WIFI);           request.setAllowedOverRoaming(false);           request.setTitle("Download Sample");           long id = dm.enqueue(request);           prefs.edit().putLong(DL_ID, id).commit();         } else {           queryDownloadStatus();         }         registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));     }     @Override     public void onPause() {       super.onPause();       unregisterReceiver(receiver);     }     private BroadcastReceiver receiver = new BroadcastReceiver() {     @Override     public void onReceive(Context context, Intent intent) {       queryDownloadStatus();     }     };     private void queryDownloadStatus() {       DownloadManager.Query query = new DownloadManager.Query();       query.setFilterById(prefs.getLong(DL_ID, 0));       Cursor c = dm.query(query);       if(c.moveToFirst()) {         int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));         Log.d("DM Sample","Status Check: "+status);         switch(status) {         case DownloadManager.STATUS_PAUSED:         case DownloadManager.STATUS_PENDING:         case DownloadManager.STATUS_RUNNING:           break;         case DownloadManager.STATUS_SUCCESSFUL:           try {             ParcelFileDescriptor file = dm.openDownloadedFile(prefs.getLong(DL_ID, 0));             FileInputStream fis = new ParcelFileDescriptor.AutoCloseInputStream(file);             imageView.setImageBitmap(BitmapFactory.decodeStream(fis));           } catch (Exception e) {             e.printStackTrace();           }           break;         case DownloadManager.STATUS_FAILED:           dm.remove(prefs.getLong(DL_ID, 0));           prefs.edit().clear().commit();           break;         }       }     } }