gistfile1.java

@OnClick(R.id.fab)
    public void onFabClick() {
        Toast.makeText(this, "fab click", Toast.LENGTH_SHORT).show();
        Bundle data = new Bundle();
        data.putDouble("lat", lat);
        data.putDouble("lng", lng);
        Intent resultIntent = new Intent();
        resultIntent.putExtras(data);
        setResult(RESULT_OK, resultIntent);
        finish();
    }