开启新的activity获取它的返回值

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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

 package com.example.smssender;

 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 {

     private EditText et_number;

     private EditText et_number2;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         et_number = (EditText) findViewById(R.id.et_number);

         et_number2 = (EditText) findViewById(R.id.et_number2);

     }

     public void click(View view){

         Intent intent = new Intent(this, ContactActivity.class);

         //startActivity(intent);

         //请求码的作用是区别是谁发起的请求

         startActivityForResult(intent, 1);

     }

     public void click2(View view){

         Intent intent = new Intent(this, ContactActivity.class);

         //startActivity(intent);

         //请求码的作用是区别是谁发起的请求

         startActivityForResult(intent, 2);

     }

     @Override

     protected void onActivityResult(int requestCode, int resultCode, Intent data) {

         // TODO Auto-generated method stub

         super.onActivityResult(requestCode, resultCode, data);

         if(data != null){

             String number = data.getStringExtra("number");

             if(requestCode == 1){

                 et_number.setText(number);

             }else{

                 et_number2.setText(number);

             }

         }

     }

 }

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

 package com.example.smssender;

 import java.util.ArrayList;

 import java.util.List;

 import android.content.ContentResolver;

 import android.content.Context;

 import android.database.Cursor;

 import android.net.Uri;

 public class ContactService {

     public static List<contactInfo> getContactAll(Context context){

         List<contactInfo> infos = new ArrayList<contactInfo>();

         //通过内容提供者获取联系人

         ContentResolver resolver = context.getContentResolver();

         Uri uri = Uri.parse("content://com.android.contacts/raw_contacts");

         Uri dataUri = Uri.parse("content://com.android.contacts/data");

         Cursor cursor = resolver.query(uri, null, null, null, null);

         while(cursor.moveToNext()){

             String id = cursor.getString(cursor.getColumnIndex("contact_id"));

             Cursor datacursor = resolver.query(dataUri, null, "raw_contact_id=?", new String[]{id}, null);

             contactInfo info = new contactInfo();

             while(datacursor.moveToNext()){

                 String data1 = datacursor.getString(datacursor.getColumnIndex("data1"));

                 String mimetype = datacursor.getString(datacursor.getColumnIndex("mimetype"));

                 if("vnd.android.cursor.item/name".equals(mimetype)){

                     info.setUsername(data1);

                 }else if("vnd.android.cursor.item/phone_v2".equals(mimetype)){

                     info.setNumber(data1);

                 }

             }

             infos.add(info);

         }

         return infos;

     }

 }

4、设置联系人进Listview

 <?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:layout_width="match_parent"

         android:layout_height="match_parent"

         android:id="@+id/lv_contact"

         ></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/et_username"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         />

     <TextView

         android:id="@+id/et_number"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         />

 </LinearLayout>

java代码 :

 package com.example.smssender;

 import java.util.List;

 import android.app.Activity;

 import android.content.ContentResolver;

 import android.content.Intent;

 import android.database.Cursor;

 import android.net.Uri;

 import android.os.Bundle;

 import android.view.View;

 import android.view.ViewGroup;

 import android.widget.AdapterView;

 import android.widget.AdapterView.OnItemClickListener;

 import android.widget.BaseAdapter;

 import android.widget.ListView;

 import android.widget.TextView;

 public class ContactActivity extends Activity {

     private ListView lv_contact;

     private List<contactInfo> infos = null;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         // TODO Auto-generated method stub

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_contact);

         infos = ContactService.getContactAll(this);

         lv_contact = (ListView)findViewById(R.id.lv_contact);

         lv_contact.setAdapter(new ContactAdapter());

         lv_contact.setOnItemClickListener(new OnItemClickListener() {

             @Override

             public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

                     long arg3) {

                 // TODO Auto-generated method stub

                 contactInfo info = infos.get(arg2);

                 String number = info.getNumber();

                 Intent data = new Intent();

                 data.putExtra("number", number);

                 setResult(0, data);//0是结果码，可以在onActivityResult重新获取

                 //关闭当前activity,把数据传回给它的激活者

                 finish();

             }

         });

     }

     private class ContactAdapter extends BaseAdapter{

         @Override

         public int getCount() {

             // TODO Auto-generated method stub

             return infos.size();

         }

         @Override

         public Object getItem(int arg0) {

             // TODO Auto-generated method stub

             return null;

         }

         @Override

         public long getItemId(int arg0) {

             // TODO Auto-generated method stub

             return 0;

         }

         @Override

         public View getView(int arg0, View arg1, ViewGroup arg2) {

             // TODO Auto-generated method stub

             contactInfo info = infos.get(arg0);

             View view = View.inflate(ContactActivity.this, R.layout.contact_item, null);

             TextView et_username = (TextView)view.findViewById(R.id.et_username);

             et_username.setText(info.getUsername());

             TextView et_number = (TextView)view.findViewById(R.id.et_number);

             et_number.setText(info.getNumber());        

             return view;

         }

     }

 }