Rahul Kulhalli Rahul Kulhalli - 1 month ago 13
Android Question

EventBus - Subscriber class and its super classes have no public methods with the @subscribe annotation

I'm creating an Android application using EventBus for posting asynchronous broadcasts to other classes, but I'm running into an error during execution.

MainActivity.java



import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.google.android.gms.maps.model.LatLng;
import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;


public class MainActivity extends AppCompatActivity {

//Globals
public String uname = null;
public double lat = 0;
public double lng = 0;

//Get GUI handles
public Button sendButton; //
public EditText username;
public Button MapButton; //
public EditText LatBox;
public EditText LngBox;


protected void onDestroy() {
super.onDestroy();
EventBus.getDefault().unregister(this);
}

@Override
protected void onCreate(Bundle savedInstanceState) {

//register EventBus
EventBus.getDefault().register(this);

super.onCreate(savedInstanceState);
//set GUI for MainActivity
setContentView(R.layout.activity_main);

//get handlers
LatBox = (EditText)findViewById(R.id.LatBox);
LngBox = (EditText)findViewById(R.id.LngBox);

MapButton = (Button)findViewById(R.id.locationButton);
//Call the class which will handle finding coordinates
MapButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent MapIntent = new Intent(getApplicationContext(), MapClass.class);
startActivityForResult(MapIntent, 0);
}
});

sendButton = (Button)findViewById(R.id.Submit);
//Set action for Button
sendButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {

//Get username from user
username = (EditText)findViewById(R.id.UsernameText);
uname = username.getText().toString();

//Generate intent to start IntentService
Intent i = new Intent(getApplicationContext(), Register.class);

//Put the extra field of username
i.putExtra("username", uname);
i.putExtra("latitude", lat);
i.putExtra("longitude", lng);
i.putExtra("type", "meetup.be2015.gcm_meetup.MAIN_ACTIVITY");

//Start the IntentService on a different thread
startService(i);
}
});

}


@Subscribe(threadMode = ThreadMode.MAIN)
public void onEvent(LatLng currentPos){

LatBox.setText(String.valueOf(currentPos.latitude));
LngBox.setText(String.valueOf(currentPos.longitude));

lat = currentPos.latitude;
lng = currentPos.longitude;
}
}


MapClass.java



import android.app.IntentService;
import android.content.Intent;
import android.location.Location;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.LatLng;
import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;

public class MapClass extends AppCompatActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

private GoogleApiClient mGoogleApiClient;
private GoogleMap mgoogleMap;
private LatLng latLng;
private GoogleApiClient client;

@Override
public void onMapReady(GoogleMap googleMap) {
mgoogleMap = googleMap;
mgoogleMap.setMyLocationEnabled(true); //Sets location to current position
buildGoogleApiClient();
mGoogleApiClient.connect();
}

protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}

@Override
public void onDestroy() {
super.onDestroy();
if (EventBus.getDefault().isRegistered(this)) {
EventBus.getDefault().unregister(this);
}
}

@Override
public void onConnected(Bundle bundle) {
Location MLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if (MLastLocation != null) {
latLng = new LatLng(MLastLocation.getLatitude(), MLastLocation.getLongitude());

//Post the LatLng to MainActivity
EventBus.getDefault().post(latLng);

//Send sticky event to Register and MyGcmListenerService
EventBus.getDefault().postSticky(latLng);

} else {
Log.d("onConnected", "Value of LatLng is NULL");
latLng = new LatLng(0, 0); //equator
}
}

@Override
public void onConnectionSuspended(int i) {
//Notify
Log.d("ConnectionSuspended", "Connection Suspended. Status: " + i);
mgoogleMap.clear();
mGoogleApiClient.disconnect();
}

@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
//Notify
Log.d("ConnectionFailed", "Connection Failed. Status: " + connectionResult.toString());
mgoogleMap.clear();
mGoogleApiClient.disconnect();
}

@Subscribe
public void onEvent() {
Log.d("EVENT", "EVENT");
}

@Override
public void onStart() {
super.onStart();
if (!EventBus.getDefault().isRegistered(this)) {
EventBus.getDefault().register(this);
}


@Override
public void onStop() {
super.onStop();
if (EventBus.getDefault().isRegistered(this)) {
EventBus.getDefault().unregister(this);
}

}
}


The LogCat shows the following:

03-08 22:54:56.970 8570-8570/meetup.be2015.gcm_meetup E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{meetup.be2015.gcm_meetup/meetup.be2015.gcm_meetup.MapClass}:
org.greenrobot.eventbus.EventBusException: Subscriber class meetup.be2015.gcm_meetup.MapClass
and its super classes have no public methods with the @Subscribe annotation
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2118)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2143)
at android.app.ActivityThread.access$700(ActivityThread.java:140)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1237)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:174)
at android.app.ActivityThread.main(ActivityThread.java:4952)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
at dalvik.system.NativeStart.main(Native Method)
Caused by: org.greenrobot.eventbus.EventBusException: Subscriber class meetup.be2015.gcm_meetup.MapClass
and its super classes have no public methods with the @Subscribe annotation
at org.greenrobot.eventbus.SubscriberMethodFinder.findSubscriberMethods(SubscriberMethodFinder.java:67)
at org.greenrobot.eventbus.EventBus.register(EventBus.java:136)
at meetup.be2015.gcm_meetup.MapClass.onStart(MapClass.java:91)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1178)
at android.app.Activity.performStart(Activity.java:5198)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2091)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2143) 
at android.app.ActivityThread.access$700(ActivityThread.java:140) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1237) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:174) 
at android.app.ActivityThread.main(ActivityThread.java:4952) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:511) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794) 
at dalvik.system.NativeStart.main(Native Method) 


Why is this happening? Am I doing something wrong?

Answer

i think it is because onEvent inside MapClass.java has no parameter. Could you try with the expected parameter?

Comments