FragmentActivity.java

package com.mcxtzhang.databindingdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class FragmentActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment);
        getSupportFragmentManager().
                beginTransaction().
                replace(R.id.activity_fragment, new BlankFragment()).
                commitAllowingStateLoss();
    }
}