Android Open Source - BLEService Bluetooth Broadcast Receiver

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License

The source code is released under:

Copyright (c) 2014, Ratio LLC. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: ...

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Java Source Code

package com.ratio.deviceService;
// w w  w  . ja v a2  s.  c o m
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;

/**
 * IMPORTANT NOTE: this receiver needs to know that the disable request was actually sent by the device service
 * rather than being initiated by the user, otherwise it will enable bluetooth and kick off a device scan if the
 * user disables bluetooth
 * This is part of a workaround where we have to disable and re-enable bluetooth to be able scan devices
 * see http://stackoverflow.com/questions/17870189/android-4-3-bluetooth-low-energy-unstable
 * I hope that in the future that this is unnecessary
 * @author matt2
 *
 */
public class BluetoothBroadcastReceiver extends BroadcastReceiver {
  private static String TAG = BluetoothBroadcastReceiver.class.getName();
    private static BluetoothManager     mBluetoothManager = null;
    private static BluetoothAdapter     mBluetoothAdapter = null;
    private static boolean           mfAdapterReset = false;
    
  @Override
  public void onReceive(Context context, Intent intent) {
      // For API level 18 and above, get a reference to BluetoothAdapter through bluetoothManager.
      if (mBluetoothManager == null) {
          mBluetoothManager = (BluetoothManager) context.getSystemService(Context.BLUETOOTH_SERVICE);
          if (mBluetoothManager == null) {
              Log.e(TAG, "Unable to initialize BluetoothManager.");
              return;
          } 
        mBluetoothAdapter = mBluetoothManager.getAdapter();
        if (mBluetoothAdapter == null) {
            Log.e(TAG, "Unable to obtain a BluetoothAdapter.");
            return;
        }
      }
      
    String action = intent.getAction();
    
    // ensure that this was initiated by the service.
    if (action.equals(DeviceService.RESET_ADAPTER)) {
      mfAdapterReset = true;
    } else if (mfAdapterReset) {

      // re-enable the bluetooth adapter if it was disabled by our service, and only by our service
      if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
        int adapterState = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
        if (adapterState == BluetoothAdapter.STATE_OFF) {
          mBluetoothAdapter.enable();

        } else if (adapterState == BluetoothAdapter.STATE_ON) {
          // NOTE: I'd love to be able to pass the service class here, but since it's a top-level
          // broadcast receiver, I can't do that.
          Intent serviceIntent = new Intent(context, DeviceService.class);
          serviceIntent.setAction(DeviceService.ACTION_PERFORM_SCAN);
          context.startService(serviceIntent);
          mfAdapterReset = false;
        }
      }
    }
  }  
}

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