Android（java）学习笔记222：开发一个多界面的应用程序之不同界面间互相传递数据（短信助手案例的优化：请求码和结果码）

 <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:orientation="vertical"
tools:context="com.himi.Smshelper.MainActivity" >

<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="select_contacts"
android:text="浏览选择联系人" />

<EditText
android:id="@+id/et_phone"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="phone"
android:singleLine="true" />

<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="select_Sms"
android:text="浏览选择短信" />

<EditText
android:id="@+id/et_Sms"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textMultiLine"
android:lines="6" />

</LinearLayout>

 package com.himi.Smshelper;

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 {
private EditText et_Sms;
private EditText et_phone;
public static int GET_SMS = 1;//获取短信的内容请求码
public static int GET_PHONE = 2;//获取电话号码请求码

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_Sms = (EditText) findViewById(R.id.et_Sms);
et_phone = (EditText) findViewById(R.id.et_phone);

}
/**
* 选择短信内容
* @param view
*/
public void select_Sms(View view) {
Intent intent = new Intent(this, SmsActivity.class);
// 直接打开新的界面
// startActivity(intent);
startActivityForResult(intent, GET_SMS);

}
/**
* 选择联系人
* @param view
*/
public void select_contacts(View view) {
Intent intent = new Intent(this, ContactActivity.class);
// 直接打开新的界面
// startActivity(intent);
startActivityForResult(intent, GET_PHONE);
}

/**
*返回数据  当我们开启的Activity关闭的时候(这里我们开启的就是SmsActivity)，SmsActivity关闭之后调用这个方法
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

if (requestCode == GET_SMS) {
if (data != null) {
String context = data.getStringExtra("context");
et_Sms.setText(context);
}
}else {
String context = data.getStringExtra("phone");
et_phone.setText(context);
}
super.onActivityResult(requestCode, resultCode, data);
}

}

 package com.himi.Smshelper;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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.ListView;
import android.widget.SimpleAdapter;

public class ContactActivity extends Activity {
private ListView lv;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO 自动生成的方法存根
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contacts);
lv = (ListView) findViewById(R.id.lv);
List<Map<String, String>> data = new ArrayList<Map<String, String>>();
for (int i = 0; i < 10; i++) {
Map<String, String> map = new HashMap<String, String>();
map.put("name", "刘德华"+i);
map.put("phone", "1000" + i);
data.add(map);
}
lv.setAdapter(new SimpleAdapter(ContactActivity.this, data, R.layout.item_contacts,
new String[] {"name", "phone"}, new int[] {R.id.tv_name,R.id.tv_phone}));

lv.setOnItemClickListener(new OnItemClickListener() {

public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String phone = "1000"+position;
Intent data = new Intent();
data.putExtra("phone", phone);
setResult(0, data);
System.out.println("你点击了第"+position+"选项");
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" >

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

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

</LinearLayout>

 package com.himi.Smshelper;

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 SmsActivity extends Activity {
private ListView lv;
private String[] sms  = {
"七夕节到了，送你一碗长寿面，祝你们的爱情像长寿面一样长长久久，永远不分离。送你一份酸辣汤，让你们生活像酸辣汤一样有滋有味。真诚的祝福你七夕快乐。",
"雪花的美丽，飘舞着心情的惦记，圣诞节最思念是你，给你我祝福的深意，把幸福累积，祈祷着祝愿的真挚，圣诞节祝你万事如意！",
"三年光阴，匆匆而过，如梦的年纪，弥漫着串串欢声笑语，不要挥手叹息，觉得繁花尽去，鼓足勇气，不要忘了互递惊喜的消息。",
"亲爱的织女：七夕情人节将至，愿我们高举中国特色痴情主义伟大旗帜，发扬鹊桥相会优良传统，保持二人世界爱情在线，携手开创爱情新局面。牛郎敬上。"

};
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO 自动生成的方法存根
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sms);
lv = (ListView) findViewById(R.id.iv);
lv.setAdapter(new ArrayAdapter<String>(this, R.layout.item, sms));

//给listview的条目设置点击事件
lv.setOnItemClickListener(new OnItemClickListener() {

public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {

String context = sms[position];
Intent intent = new Intent();
intent.putExtra("context", context);
setResult(0, intent);
finish();
}

});

}

}