Restrict the types of networks over which DownloadManager may proceed.

In the last exercise "Check DownloadManager status and reason of FAILED and PAUSED"; we can restrict the types of networks over which DownloadManager may proceed, by calling setAllowedNetworkTypes() and setAllowedOverRoaming().

request.setAllowedNetworkTypes()-
Restrict the types of networks over which this download may proceed. By default, all network types are allowed.
- Request.NETWORK_WIFI
- Request.NETWORK_MOBILE
- Request.NETWORK_WIFI | Request.NETWORK_MOBILE

request.setAllowedOverRoaming(false) -
Set whether this download may proceed over a roaming connection. By default, roaming is allowed.

package com.exercise.AndroidDownloadManager;

import java.io.FileInputStream;
import java.io.FileNotFoundException;

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.content.SharedPreferences.Editor;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.ParcelFileDescriptor;
import android.preference.PreferenceManager;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class AndroidDownloadManagerActivity extends Activity {

final String DOWNLOAD_FILE = "http://goo.gl/w3XV3";

final String strPref_Download_ID = "PREF_DOWNLOAD_ID";

SharedPreferences preferenceManager;
DownloadManager downloadManager;

ImageView image;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
    
      preferenceManager
       = PreferenceManager.getDefaultSharedPreferences(this);
      downloadManager
       = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);
    
      Button btnStartDownload = (Button)findViewById(R.id.startdownload);
      btnStartDownload.setOnClickListener(btnStartDownloadOnClickListener);
    
      image = (ImageView)findViewById(R.id.image);
  }

  Button.OnClickListener btnStartDownloadOnClickListener
  = new Button.OnClickListener(){

 @Override
 public void onClick(View v) {
  // TODO Auto-generated method stub
 
  Uri downloadUri = Uri.parse(DOWNLOAD_FILE);
  DownloadManager.Request request = new DownloadManager.Request(downloadUri);
 
  /*
   *  request.setAllowedNetworkTypes()-
   *  Restrict the types of networks over which this download may proceed.
   *  By default, all network types are allowed.
   *  - Request.NETWORK_WIFI
   *  - Request.NETWORK_MOBILE
   *  - Request.NETWORK_WIFI | Request.NETWORK_MOBILE
   *
   *  request.setAllowedOverRoaming(false) -
   *  Set whether this download may proceed over a roaming connection.
   *  By default, roaming is allowed.
   */
  request.setAllowedNetworkTypes(Request.NETWORK_WIFI);
  request.setAllowedOverRoaming(false);
   
  long id = downloadManager.enqueue(request);
 
  //Save the request id
  Editor PrefEdit = preferenceManager.edit();
  PrefEdit.putLong(strPref_Download_ID, id);
  PrefEdit.commit();

 }};

@Override
protected void onResume() {
 // TODO Auto-generated method stub
 super.onResume();

 CheckDwnloadStatus();

 IntentFilter intentFilter
  = new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
 registerReceiver(downloadReceiver, intentFilter);
}

@Override
protected void onPause() {
 // TODO Auto-generated method stub
 super.onPause();
 unregisterReceiver(downloadReceiver);
}

private BroadcastReceiver downloadReceiver = new BroadcastReceiver() {

 @Override
 public void onReceive(Context arg0, Intent arg1) {
  // TODO Auto-generated method stub
  CheckDwnloadStatus();
 }
};

private void CheckDwnloadStatus(){

 // TODO Auto-generated method stub
 DownloadManager.Query query = new DownloadManager.Query();
 long id = preferenceManager.getLong(strPref_Download_ID, 0);
 query.setFilterById(id);
 Cursor cursor = downloadManager.query(query);
 if(cursor.moveToFirst()){
  int columnIndex = cursor.getColumnIndex(DownloadManager.COLUMN_STATUS);
  int status = cursor.getInt(columnIndex);
  int columnReason = cursor.getColumnIndex(DownloadManager.COLUMN_REASON);
  int reason = cursor.getInt(columnReason);
 
  switch(status){
  case DownloadManager.STATUS_FAILED:
   String failedReason = "";
   switch(reason){
   case DownloadManager.ERROR_CANNOT_RESUME:
    failedReason = "ERROR_CANNOT_RESUME";
    break;
   case DownloadManager.ERROR_DEVICE_NOT_FOUND:
    failedReason = "ERROR_DEVICE_NOT_FOUND";
    break;
   case DownloadManager.ERROR_FILE_ALREADY_EXISTS:
    failedReason = "ERROR_FILE_ALREADY_EXISTS";
    break;
   case DownloadManager.ERROR_FILE_ERROR:
    failedReason = "ERROR_FILE_ERROR";
    break;
   case DownloadManager.ERROR_HTTP_DATA_ERROR:
    failedReason = "ERROR_HTTP_DATA_ERROR";
    break;
   case DownloadManager.ERROR_INSUFFICIENT_SPACE:
    failedReason = "ERROR_INSUFFICIENT_SPACE";
    break;
   case DownloadManager.ERROR_TOO_MANY_REDIRECTS:
    failedReason = "ERROR_TOO_MANY_REDIRECTS";
    break;
   case DownloadManager.ERROR_UNHANDLED_HTTP_CODE:
    failedReason = "ERROR_UNHANDLED_HTTP_CODE";
    break;
   case DownloadManager.ERROR_UNKNOWN:
    failedReason = "ERROR_UNKNOWN";
    break;
   }

   Toast.makeText(AndroidDownloadManagerActivity.this,
     "FAILED: " + failedReason,
     Toast.LENGTH_LONG).show();
   break;
  case DownloadManager.STATUS_PAUSED:
   String pausedReason = "";
  
   switch(reason){
   case DownloadManager.PAUSED_QUEUED_FOR_WIFI:
    pausedReason = "PAUSED_QUEUED_FOR_WIFI";
    break;
   case DownloadManager.PAUSED_UNKNOWN:
    pausedReason = "PAUSED_UNKNOWN";
    break;
   case DownloadManager.PAUSED_WAITING_FOR_NETWORK:
    pausedReason = "PAUSED_WAITING_FOR_NETWORK";
    break;
   case DownloadManager.PAUSED_WAITING_TO_RETRY:
    pausedReason = "PAUSED_WAITING_TO_RETRY";
    break;
   }
  
   Toast.makeText(AndroidDownloadManagerActivity.this,
     "PAUSED: " + pausedReason,
     Toast.LENGTH_LONG).show();
   break;
  case DownloadManager.STATUS_PENDING:
   Toast.makeText(AndroidDownloadManagerActivity.this,
     "PENDING",
     Toast.LENGTH_LONG).show();
   break;
  case DownloadManager.STATUS_RUNNING:
   Toast.makeText(AndroidDownloadManagerActivity.this,
     "RUNNING",
     Toast.LENGTH_LONG).show();
   break;
  case DownloadManager.STATUS_SUCCESSFUL:
  
   Toast.makeText(AndroidDownloadManagerActivity.this,
     "SUCCESSFUL",
     Toast.LENGTH_LONG).show();
   GetFile();
   break;
  }
 }
}

private void GetFile(){
 //Retrieve the saved request id
 long downloadID = preferenceManager.getLong(strPref_Download_ID, 0);

 ParcelFileDescriptor file;
 try {
  file = downloadManager.openDownloadedFile(downloadID);
  FileInputStream fileInputStream
   = new ParcelFileDescriptor.AutoCloseInputStream(file);
  Bitmap bm = BitmapFactory.decodeStream(fileInputStream);
  image.setImageBitmap(bm);
 } catch (FileNotFoundException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
}
}

next:
- Set the title of Download on notification, setTitle()