android - Send string from service to activity

Question

I'm trying to send string from service to my main activity with broadcast. I have read in a few forums that there are 2 ways to use broadcast. One is to register the activity in the manifest and the second way is to do it on the activity, local. I would like to know how I can use the second way. I have tried to do it but unfortunately I did not succeed.

Please tell me what I'm doing wrong.

Service code

   public class MyGcmListenerService extends GcmListenerService {

private static final String TAG = "MyGcmListenerService";

// [START receive_message]
@Override
public void onMessageReceived(String from, Bundle data) {
    String typemessage = data.getString("typemessage"); // typeMessage = 0 or 1 = lock or unlock
    String datamessage = data.getString("datamessage"); // dataMessage = time and message that says lock or unlock

    Log.d(TAG, "TypeMessage: " + typemessage);
    Log.d(TAG,"DataMesaage:"+ datamessage);

    Intent in = new Intent();
    in.putExtra("TYPE",typemessage);
    in.setAction("NOW");
    sendBroadcast(in);
  ...

Main Activity Code

    public class MainActivity extends Activity implements SensorEventListener, Listen {

        private BroadcastReceiver statusReceiver;
        private IntentFilter mIntent;


    Sensor accelerometer;
    SensorManager sm;
    TextView acceleration;
    SendValues sv;
    int counter3 = 0;
    int counter5 = 0;

    private static final String TAG = "MainActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

         mIntent = new IntentFilter("NOW");

      // this.registerReceiver(,new IntentFilter("status"));

        sm = (SensorManager) getSystemService(SENSOR_SERVICE);
        sm.registerListener(this,accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
        accelerometer = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

        acceleration = (TextView) findViewById(R.id.sensorTxt);

        statusReceiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {

                String type = intent.getStringExtra("message");  //get the type of message from MyGcmListenerService 1 - lock or 0 -Unlock
                sm = (SensorManager) getSystemService(SENSOR_SERVICE);
                accelerometer = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
                Log.d(TAG, "Status: " + type);
                if (type == "1") // 1 == lock
                {
                    Toast.makeText(getApplication(), "Lock", Toast.LENGTH_LONG).show();
                } else {
                    Toast.makeText(getApplication(), "UNLOCK", Toast.LENGTH_LONG).show();
                }
            }

        };
    }

        @Override
         protected void onResume()
         {
            super.onResume();
            registerReceiver(statusReceiver,mIntent);
          }

    @Override
    protected void onPause() {
        if(mIntent != null) {
            unregisterReceiver(statusReceiver);
            mIntent = null;
        }
        super.onPause();
    }


----------

Well I don't know what I'm doing wrong, and another question, what do I need to put in the

In set Action("I can put here any string/action that I what? And what does it mean action? I just want to send string to the main activity, what action should I do"?)

Answer 1

You can use LocalBroadcastManager to achieve what you want. Like in your service call this method when you want to send the data.

private static void sendMessageToActivity(String msg) {
  Intent intent = new Intent("intentKey");
  // You can also include some extra data.
  intent.putExtra("key", msg);
  LocalBroadcastManager.getInstance(context).sendBroadcast(intent);
}

In your Activity register a Receiver in onCreate()

LocalBroadcastManager.getInstance(getActivity()).registerReceiver(mMessageReceiver, new IntentFilter("intentKey"));

And out of onCreate() this code.

private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
  @Override
  public void onReceive(Context context, Intent intent) {
      // Get extra data included in the Intent
      String message = intent.getStringExtra("key");
      tvStatus.setText(message);
      // Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
  }
};