MainActivity.java

package cn.jiajixin.nuwasample;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.widget.TextView;

import cn.jiajixin.nuwasample.Hello.Hello;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        TextView textView = (TextView) findViewById(R.id.textview);
        textView.setText(new Hello().say());
    }

}