CODEWITHSUNDEEP
javaandroidfirebasefirebase-realtime-database
husen
husen

Reputation: 89

How to get data object from another event Android Studio

Here is my target event :

refDatabase.addChildEventListener(new ChildEventListener() {
    @Override
    public void onChildAdded(DataSnapshot dataSnapshot, String s) {
        LatLng newlocation = new LatLng(dataSnapshot.child("latitude").getValue(Double.class),dataSnapshot.child("longitude").getValue(Double.class));
        nama = new String(dataSnapshot.child("nama").getValue(String.class));
        kec = new String(dataSnapshot.child("kecamatan").getValue(String.class));
        kab = new String(dataSnapshot.child("kebupaten").getValue(String.class));

        googleMap.addMarker(new MarkerOptions().position(newlocation).title(nama+", "+kec+", "+kab));  
    }
});

How can I get the object newlocation and put that in this event:

tampil.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        //
    }
});

Upvotes: 2

Views: 1145

Answers (2)

Alex Mamo
Alex Mamo

Reputation: 138824

You can achieve this, using a callback. Fist you need to create an interface:

public interface MyCallback {
    void onCallback(LatLng newlocation);
}

Then you need to create a method that is actually getting the data from the database. This method should look like this:

public void readData(MyCallback myCallback) {
    refDatabase.addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {
            newlocation = new LatLng(dataSnapshot.child("latitude").getValue(Double.class),dataSnapshot.child("longitude").getValue(Double.class));
            nama = new String(dataSnapshot.child("nama").getValue(String.class));
            kec = new String(dataSnapshot.child("kecamatan").getValue(String.class));
            kab = new String(dataSnapshot.child("kebupaten").getValue(String.class));

            googleMap.addMarker(new MarkerOptions().position(newlocation).title(nama+", "+kec+", "+kab));
            myCallback.onCallback(newlocation);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {}
    });
}

In the end just simply call readData() method and pass an instance of the MyCallback interface as an argument in your onClick() method like this:

tampil.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        readData(new MyCallback() {
            @Override
            public void onCallback(LatLng newlocation) {
                //Do what you need to do with newlocation
            }
        });
    }
});

For more informations, I recommend you see the anwser from this post and also take a look at this video.

Upvotes: 1

Nicola Gallazzi
Nicola Gallazzi

Reputation: 8715

You can use EventBus libray for this purpose: https://github.com/greenrobot/EventBus in three steps

  1. Define the event (E.g locationRetrievedEvent)
  2. Register the subscriber (E.g your activity)
  3. Post the event with EventBust post() function

Upvotes: 0

Related Questions