android有返回结果的 Activity

package com.example.android.active;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
/**
* Activity实现返回结果
* 1.需要得到activity的返回结果，必须使用startActivityForResult()方法启动另一个activity
* 2.必须重写onActivityResult()方法来处理返回结果
* 3.在返回结果的activity中要使用setResult()方法设置结果
*
* */
public class MainActivity3 extends Activity implements OnClickListener{
private Button button1;
private EditText etNumber;
private static final int REQUESTCODE=1;    //请求编码，只是做一个标记，以便在onActivityResult()中识别
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
button1=(Button) findViewById(R.id.submit1);
button1.setOnClickListener(this);
etNumber=(EditText) findViewById(R.id.EditPhoneNumber);

}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//启动一个有返回结果的Activity
Intent intent=new Intent(this,MainActivity4.class);
//参数：1.intent对象  2.请求编码(标记)可以是正整数值
startActivityForResult(intent, REQUESTCODE);

}
//重写返回结果的方法
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case REQUESTCODE:
if(resultCode==RESULT_OK){
String phone=data.getStringExtra("phone");
etNumber.setText(phone);
}
break;

default:
break;
}
}
}

package com.example.android.active;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity4 extends Activity implements OnItemClickListener{
private ListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main4);
listView=(ListView) findViewById(R.id.listView1);
String [] array={"123","334","435"};
ArrayAdapter<String> adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_single_choice,array);
listView.setAdapter(adapter);
listView.setOnItemClickListener(this);

}
@Override
public void onItemClick(AdapterView<?> arg0, View v, int arg2, long arg3) {
// TODO Auto-generated method stub
TextView textView=(TextView)v;
String s=(String) textView.getText().toString();
System.out.println(s);
//设置返回的结果
Intent intent=new Intent();
intent.putExtra("phone", s);
this.setResult(RESULT_OK, intent);

this.finish();
}

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<EditText
android:id="@+id/EditPhoneNumber"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入"

/>

<Button
android:id="@+id/submit1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="提交"

/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
</ListView>

</LinearLayout>