Android-activity获取返回值

写了一个DEMO：短信选择联系人的数据传递

主activity：

import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.View;import android.widget.EditText;public class MainActivity extends Activity {	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);			}	public void click(View c){		//跳转至选择联系人Activity		Intent intent = new Intent(this, ContactActivity.class);//		startActivity(intent);		//用这个api启动的Activity，在销毁时，系统会回调onActivityResult		startActivityForResult(intent, 10);	}			public void click2(View v){		//跳转至选择快捷回复的Activity		Intent intent = new Intent(this, CallbackActivity.class);		startActivityForResult(intent, 20);	}	//如果有Activity在销毁时返回了数据，那么就会调用此方法来接收数据	//requestCode:用来区分数据来自于哪一个Activity	//resultCode:用来区分返回的数据是什么类型的	@Override	protected void onActivityResult(int requestCode, int resultCode, Intent data) {		// TODO Auto-generated method stub		super.onActivityResult(requestCode, resultCode, data);				String name = data.getStringExtra("name");		if(requestCode == 10){			EditText et = (EditText)findViewById(R.id.et);			et.setText(name);		}		else if(requestCode == 20){			EditText et_content = (EditText)findViewById(R.id.et_content);			et_content.setText(name);		}	}	}

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;public class ContactActivity extends Activity {	@Override	protected void onCreate(Bundle savedInstanceState) {		// TODO Auto-generated method stub		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_contact);				ListView lv = (ListView) findViewById(R.id.lv);				final String[] objects = new String[]{				"小志",				"逼哥",				"世界级XXX",				"国服第一"		};				lv.setAdapter(new ArrayAdapter<String>(this, R.layout.item_listview, R.id.tv, objects));			//给listview设置条目的点击侦听		lv.setOnItemClickListener(new OnItemClickListener() {			//当某个条目被点击时，此方法调用			@Override			public void onItemClick(AdapterView<?> parent, View view,					int position, long id) {								//Activity返回时传递数据，也是通过意图对象				Intent data = new Intent();				//把要传递的数据封装至意图对象中				data.putExtra("name", objects[position]);								//当前Activity销毁时，data这个意图就会传递给启动当前Activity的那个Activity				setResult(1, data);								//销毁当前Activity				finish();			}		});	}		@Override	public void onBackPressed() {		// TODO Auto-generated method stub		super.onBackPressed();	}}

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;public class CallbackActivity extends Activity {	@Override	protected void onCreate(Bundle savedInstanceState) {		// TODO Auto-generated method stub		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_contact);				ListView lv = (ListView) findViewById(R.id.lv);				final String[] objects = new String[]{				"免谈，没戏，滚犊子",				"媳妇我错了，求原谅",				"老子才是一家之主"		};		lv.setAdapter(new ArrayAdapter<String>(this, R.layout.item_listview, R.id.tv, objects));				lv.setOnItemClickListener(new OnItemClickListener() {			@Override			public void onItemClick(AdapterView<?> parent, View view,					int position, long id) {				Intent data = new Intent();				data.putExtra("name", objects[position]);								setResult(2, data);				finish();							}		});	}}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity"     android:orientation="vertical"    >    <LinearLayout         android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        >    <EditText        android:id="@+id/et"        android:layout_weight="1"        android:layout_width="0dp"        android:layout_height="wrap_content"        android:hint="请输入联系人"        />    <Button         android:layout_weight="0"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="+"        android:onClick="click"        />    </LinearLayout>    <EditText        android:id="@+id/et_content"        android:layout_weight="1"        android:layout_width="match_parent"        android:layout_height="0dp"        android:hint="请输入短信内容"        android:gravity="top"        />	<Button 	    android:layout_width="wrap_content"	    android:layout_height="wrap_content"	    android:text="快捷回复"	    android:onClick="click2"	    />	<Button 	    android:layout_width="wrap_content"	    android:layout_height="wrap_content"	    android:text="发送短信"	    /></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/lv"        android:layout_width="match_parent"        android:layout_height="match_parent"        ></ListView></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" >        <TextView         android:id="@+id/tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textSize="20sp"        /></LinearLayout>