Android How to - Enable Bluetooth and send file

Question

We would like to know how to enable Bluetooth and send file.
Answer

The following code shows how to use Bluetooth to send file.
/*from  w  ww  .  j ava2  s  .c o  m*/
import java.io.File;
import java.util.List;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;

public class BluetoothManager {

  private BluetoothAdapter btAdapter;
  private Activity activity;
  private boolean supports_bluetooth = true;
  private File file_to_send;
  
  private static final int BT_DISCOVERY = 120;
  private static final int REQUEST_BLUETOOTH = 1;
  
  public BluetoothManager(Activity a) {
    this.activity = a;
    this.btAdapter = BluetoothAdapter.getDefaultAdapter();
    if (btAdapter == null) {
      supports_bluetooth = false;
    }
  }
  
  public void enableBluetooth(){
    Intent discoveryIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
    discoveryIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, BT_DISCOVERY );
    activity.startActivityForResult(discoveryIntent, REQUEST_BLUETOOTH);
  }
  
  public void SendFile(String path) {
    if (supports_bluetooth) {
      File f = new File(path);
      if (f.exists()) {
        file_to_send = f;
        enableBluetooth();
      }
    }
  }
  
  public void onActivityResult (int requestCode, int resultCode, Intent data) {
    if (resultCode == BT_DISCOVERY && requestCode == REQUEST_BLUETOOTH) {
      Intent intent = new Intent();
      intent.setAction(Intent.ACTION_SEND);
      intent.setType("image/jpeg");
      intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file_to_send) );
      PackageManager pm = activity.getPackageManager();
      List<ResolveInfo> applist = pm.queryIntentActivities( intent, 0);
      String packageName = null;
      String className = null;
      for(ResolveInfo info: applist){
        packageName = info.activityInfo.packageName;
        if( packageName.equals("com.android.bluetooth")){
           className = info.activityInfo.name;
           break;
        }
      }
      intent.setClassName(packageName, className);
      activity.startActivity(intent);
    }
  }
}