开启新的activity获取它的返回值，activity获取返回值

开启新的activity获取它的返回值，activity获取返回值

1、开始界面

<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=".MainActivity" >

    <LinearLayout 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <EditText
            android:id="@+id/et_number"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="请输入联系人" />
        <Button 
            android:onClick="click"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="联系人"
            />
    </LinearLayout>
     <LinearLayout 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <EditText
            android:id="@+id/et_number2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:hint="请输入联系人" />
        <Button 
            android:onClick="click2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="联系人2"
            />
    </LinearLayout>

</LinearLayout>

2、开启新的activity代码

 1 package com.example.smssender;
 2 
 3 import android.os.Bundle;
 4 import android.app.Activity;
 5 import android.content.Intent;
 6 import android.view.Menu;
 7 import android.view.View;
 8 import android.widget.EditText;
 9 
10 public class MainActivity extends Activity {
11 
12     private EditText et_number;
13     private EditText et_number2;
14     @Override
15     protected void onCreate(Bundle savedInstanceState) {
16         super.onCreate(savedInstanceState);
17         setContentView(R.layout.activity_main);
18         et_number = (EditText) findViewById(R.id.et_number);
19         et_number2 = (EditText) findViewById(R.id.et_number2);
20     }
21 
22     public void click(View view){
23         Intent intent = new Intent(this, ContactActivity.class);
24         //startActivity(intent);
25         //请求码的作用是区别是谁发起的请求
26         startActivityForResult(intent, 1);
27     }
28     
29     public void click2(View view){
30         Intent intent = new Intent(this, ContactActivity.class);
31         //startActivity(intent);
32         //请求码的作用是区别是谁发起的请求
33         startActivityForResult(intent, 2);
34     }
35     
36     
37     @Override
38     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
39         // TODO Auto-generated method stub
40         super.onActivityResult(requestCode, resultCode, data);
41         if(data != null){
42             String number = data.getStringExtra("number");
43             if(requestCode == 1){
44                 et_number.setText(number);
45             }else{
46                 et_number2.setText(number);
47             }
48         }
49     }
50 
51 }

3、获取联系人

      1)清单文件

　　<uses-permission android:name="android.permission.READ_CONTACTS"/>//权限

      2)通过内容提供者获取联系人

 1 package com.example.smssender;
 2 
 3 import java.util.ArrayList;
 4 import java.util.List;
 5 
 6 import android.content.ContentResolver;
 7 import android.content.Context;
 8 import android.database.Cursor;
 9 import android.net.Uri;
10 
11 public class ContactService {
12     public static List<contactInfo> getContactAll(Context context){
13         List<contactInfo> infos = new ArrayList<contactInfo>();
14         //通过内容提供者获取联系人
15         ContentResolver resolver = context.getContentResolver();
16         Uri uri = Uri.parse("content://com.android.contacts/raw_contacts");
17         Uri dataUri = Uri.parse("content://com.android.contacts/data");
18         Cursor cursor = resolver.query(uri, null, null, null, null);
19         while(cursor.moveToNext()){
20             String id = cursor.ge