How can I increase integer value by click on like button in firebase database

Question

Here I have used m Like.set Text but don't know what will be next step.

{  public void setLikeBtn(final String post_key){

            mDatabaseLike.addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {


                    if (mAuth.getCurrentUser()==null){

                    }

                   else if (dataSnapshot.child(post_key).hasChild(mAuth.getCurrentUser().getUid())){


                       mLike.setText("Likes"+"");
                        mLikeButton.setImageResource(R.drawable.red_thumb);

                    }else {

                        mLikeButton.setImageResource(R.drawable.ic_thumb_up_black_24dp);



                    }
                }

}

Database references
{
 mDatabaseLike = FirebaseDatabase.getInstance().getReference().child("Likes");

            mDatabaseLikesCount = FirebaseDatabase.getInstance().getReference().child("Likes");
}