有時(shí)候需要activity返回的時(shí)候攜帶數(shù)據(jù)返回，比如短信群發(fā)，添加多個(gè)聯(lián)系人的時(shí)候，需要選擇listView里面的聯(lián)系人，同時(shí)把聯(lián)系人的數(shù)據(jù)返回。

首先需要在主activity里面設(shè)置意圖，進(jìn)行跳轉(zhuǎn)，使用startActivityForResult而不是startActivity

  	Intent intent = new Intent(this, contactActivity.class);    	//啟動(dòng)選擇聯(lián)系人的activity    	//告訴系統(tǒng)這個(gè)activity返回時(shí)會(huì)返回?cái)?shù)據(jù)，第二個(gè)參數(shù)是請(qǐng)求碼    	startActivityForResult(intent, 10);
跳轉(zhuǎn)到界面以后，封裝數(shù)據(jù)準(zhǔn)備攜帶數(shù)據(jù)返回
	Intent data = new Intent();	//把要傳遞的數(shù)據(jù)封裝到intent對(duì)象	data.putExtra("name", objects[position]);	//data就是intent攜帶的數(shù)據(jù)，此activity一旦被銷(xiāo)毀data就會(huì)傳遞到此activity中	setResult(0, data);  //第一個(gè)參數(shù)是響應(yīng)碼	//銷(xiāo)毀當(dāng)前的activity	finish();設(shè)置條目監(jiān)聽(tīng)使用setOnItemClickListener
        lv.setOnItemClickListener(new OnItemClickListener(){        	//position：用戶(hù)點(diǎn)擊率哪一個(gè)條目			@Override			public void onItemClick(AdapterView<?> parent, View view,					int position, long id) {							}        });獲取到封裝的數(shù)據(jù)返回，執(zhí)行onActivityResult(int requestCode, int resultCode, Intent data)來(lái)反饋獲取的數(shù)據(jù)
當(dāng)一個(gè)應(yīng)該返回?cái)?shù)據(jù)的activity被銷(xiāo)毀的時(shí)候，此方法調(diào)用，用于接受數(shù)據(jù)
    @Override    PRotected void onActivityResult(int requestCode, int resultCode, Intent data){    	super.onActivityResult(requestCode, resultCode, data);    }
請(qǐng)求碼和響應(yīng)碼，主要是針對(duì)請(qǐng)求不同的activity用請(qǐng)求不同的activty，同時(shí)一個(gè)activity里面有不同的返回?cái)?shù)據(jù)需要返回碼來(lái)區(qū)分
示例代碼：
activity_main.xml
<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"    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_name"	        android:layout_weight="1"	        android:layout_width="wrap_content"	        android:layout_height="wrap_content"	        android:hint="請(qǐng)輸入聯(lián)系人" />  	    <Button 	        android:layout_width="wrap_content"	        android:layout_height="wrap_content"	        android:text="請(qǐng)選擇聯(lián)系人"	        android:onClick="click1"	        />      </LinearLayout>	<EditText 	    android:layout_width="match_parent"        android:layout_height="wrap_content"        android:lines="5"	    />	<Button 	    android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="發(fā)送"        android:onClick="click2"	    /></LinearLayout>MainActivity.java
package com.ldw.contact;import android.app.Activity;import android.content.Intent;import android.os.Bundle;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 click1(View v){    	Intent intent = new Intent(this, contactActivity.class);    	//啟動(dòng)選擇聯(lián)系人的activity    	//告訴系統(tǒng)這個(gè)activity返回時(shí)會(huì)返回?cái)?shù)據(jù)    	startActivityForResult(intent, 10);    }        //當(dāng)一個(gè)應(yīng)該返回?cái)?shù)據(jù)的activity被銷(xiāo)毀的時(shí)候，此方法調(diào)用，用于接受數(shù)據(jù)    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data){    	//根據(jù)請(qǐng)求碼判斷哪一個(gè)activity，接受哪一個(gè)activity返回的數(shù)據(jù)    	if(requestCode == 10){    	EditText et_name = (EditText) findViewById(R.id.et_name);    	//獲取到傳遞過(guò)來(lái)的參數(shù)    	et_name.setText(data.getStringExtra("name"));    	}    	super.onActivityResult(requestCode, resultCode, data);    }    }activity_contact.xml
<?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>
item_contact.xml聯(lián)系人條目
<?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"                />    </LinearLayout>
contactActivity.java
package com.ldw.contact;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) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_contact);                ListView lv = (ListView) findViewById(R.id.lv);                final String[] objects = new String[]{        "A",        "B",        "C",        "D"        };                lv.setAdapter(new ArrayAdapter<String> (this, R.layout.item_contact, R.id.tv, objects));                //對(duì)listView設(shè)置條目點(diǎn)擊偵聽(tīng)，知道什么時(shí)候點(diǎn)擊率條目，以及點(diǎn)擊了哪一個(gè)條目        lv.setOnItemClickListener(new OnItemClickListener(){        	//position：用戶(hù)點(diǎn)擊率哪一個(gè)條目			@Override			public void onItemClick(AdapterView<?> parent, View view,					int position, long id) {								Intent data = new Intent();				//把要傳遞的數(shù)據(jù)封裝到intent對(duì)象				data.putExtra("name", objects[position]);				//data就是intent攜帶的數(shù)據(jù)，此activity一旦被銷(xiāo)毀data就會(huì)傳遞到此activity中				setResult(0, data);				//銷(xiāo)毀當(dāng)前的activity				finish();							}        });	}}