init Firebase

SplashActivity.java

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.remoteconfig.FirebaseRemoteConfig;

/**
 * Created by taku on 16/05/29.
 */
public class SplashActivity extends AppCompatActivity {

    private static final String TAG = SplashActivity.class.getSimpleName();

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

        final FirebaseRemoteConfig remoteConfig = FirebaseRemoteConfig.getInstance();
        remoteConfig.setDefaults(R.xml.remote_config_defaults);
        remoteConfig.fetch(0).addOnCompleteListener(new OnCompleteListener<Void>() {
            @Override
            public void onComplete(@NonNull Task<Void> task) {
                if (task.isSuccessful()) {
                    Log.d(TAG, "Fetch Succeeded");
                    remoteConfig.activateFetched();
                } else {
                    Log.e(TAG, "Fetch failed", task.getException());
                }

                String pattern = remoteConfig.getString("pattern");
                MyApplication.getAnalytics(SplashActivity.this).setUserProperty("test_pattern", pattern);
                startActivity(MainActivity.createIntent(SplashActivity.this));
            }
        });

    }

}