<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 tools:context="com.example.administrator.testactivity.MainActivity">
 <TextView
  android:id="@+id/tv1"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:hint="潘侯爷的属相"
  android:gravity="center"
  android:textSize="30sp"/>
 <Button
  android:id="@+id/btn1"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="right"
  android:text="确定"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main2"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.example.administrator.day15.Main2Activity">
 <ListView
  android:id="@+id/lv"
  android:layout_width="match_parent"
  android:layout_height="match_parent"></ListView>
</RelativeLayout>

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
 private Button btn1;
 private TextView tv1;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  btn1 = (Button) findViewById(R.id.btn1);
  tv1 = (TextView) findViewById(R.id.tv1);
  tv1.setClickable(true);
  tv1.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    Intent intent = new Intent(MainActivity.this, Main2Activity.class);
    //设置启动intent以及对应的请求码
    startActivityForResult(intent, 2);
   }
  });
  btn1.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    Toast t= Toast.makeText(MainActivity.this, tv1.getText().toString(), Toast.LENGTH_SHORT);
    t.setGravity(Gravity.TOP,0,0);
    t.show();
   }
  });
 }
 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  //建议添加逻辑判断（使请求码与结果码配对，确保返回结果是请求码所请求的）
  tv1.setText(data.getStringExtra("select"));
 }
}

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class Main2Activity extends AppCompatActivity {
 private ListView lv;
 String[] names={"马","牛","虎","兔","龙"};
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main2);
  lv = (ListView) findViewById(R.id.lv);
  //使用ArrayAdapter为ListView每个单元格填充数据
  ArrayAdapter<String> adapter = new ArrayAdapter<String>(Main2Activity.
    this,android.R.layout.simple_list_item_single_choice,names);
  //设置ListView为单选模式
  lv.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
  //为ListView中的每个ITERM设置单击事件
  lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    Intent intent =new Intent(Main2Activity.this, MainActivity.class);;
    //将选中的item对应的信息配上键值装入Extra中供传递用
    intent.putExtra("select",names[position]);
    //设置3为结果码
    setResult(3,intent);
    finish();//结束当前Activity，返回上一个activity
   }
  });
  lv.setAdapter(adapter);
 }
}