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一、在activity中定义三个按钮 一个开启服务 一个关闭服务，还有一个是向服务发送广播
当创建出Serevice时先执行Service的onCreate（）创建服务后只执行一次 以后每次点击开启服务都不会再执行onCreate（）而是去执行onStartCommand（）停止服务时执行Service的onDestroy（）
二、在Activity中点击发送广播键会向服务发送广播（本例采用LocalBroadcastManager发送和接受广播）服务接收广播吐司出“接收到activity的广播”。服务是在oncreate（）里边创建接受者不在onStartcommand（）里边创建是因为每次点击开启服务时都会执行onStartcommand（） activity创建出service时在service中的oncreate（）里向activity发送广播 activity在oncreate（）里创建出接受者。
三、其实就是双方都有一个发送者和接收者
看代码
1 package com.qf.service01; 2 3 import android.app.Activity; 4 import android.content.BroadcastReceiver; 5 import android.content.Context; 6 import android.content.Intent; 7 import android.content.IntentFilter; 8 import android.os.Bundle; 9 import android.support.v4.content.LocalBroadcastManager; 10 import android.view.View; 11 import android.widget.Toast; 12 13 public class MainActivity extends Activity { 14 15 Intent serviceIntent; 16 MyReceiver myReceiver; 17 LocalBroadcastManager localBroadcastMgr;//本地广播管理器 18 @Override 19 protected void onCreate(Bundle savedInstanceState) { 20 super.onCreate(savedInstanceState); 21 setContentView(R.layout.activity_main); 22 23 serviceIntent=new Intent(getApplicationContext(),MyService.class); 24 localBroadcastMgr=LocalBroadcastManager.getInstance(getApplicationContext()); 25 myReceiver=new MyReceiver(); 26 localBroadcastMgr.registerReceiver(myReceiver, new IntentFilter("com.qf.broadcast.disen_service")); 27 } 28 29 30 class MyReceiver extends BroadcastReceiver{ 31 @Override 32 public void onReceive(Context context, Intent intent) { 33 Toast.makeText(MainActivity.this, "收到service的广播", Toast.LENGTH_SHORT).show(); 34 35 } 36 } 37 38 public void start(View v) { 39 startService(serviceIntent); 40 } 41 42 public void stop(View v) { 43 stopService(serviceIntent); 44 } 45 public void startService(View v) { 46 localBroadcastMgr=LocalBroadcastManager.getInstance(getApplicationContext()); 47 Intent intent1=new Intent("com.qf.broadcast.activity"); 48 49 localBroadcastMgr.sendBroadcast(intent1); 50 } 51 52 53 @Override 54 protected void onDestroy() { 55 super.onDestroy(); 56 57 //取消注册本地广播接收器 58 localBroadcastMgr.unregisterReceiver(myReceiver); 59 } 60 }
1 package com.qf.service01; 2 3 import android.app.Service; 4 import android.content.BroadcastReceiver; 5 import android.content.Context; 6 import android.content.Intent; 7 import android.content.IntentFilter; 8 import android.os.IBinder; 9 import android.support.v4.content.LocalBroadcastManager; 10 import android.util.Log; 11 import android.widget.Toast; 12 13 public class MyService extends Service { 14 15 LocalBroadcastManager localBroadcastMgr;//本地广播管理器 16 MyReceiver myReceiver; 17 public void onCreate() { //只执行一次，用于初始化Service 18 super.onCreate(); 19 Log.i("debug", "onCreate"); 20 21 myReceiver=new MyReceiver(); 22 localBroadcastMgr=LocalBroadcastManager.getInstance(getApplicationContext()); 23 localBroadcastMgr.registerReceiver(myReceiver, new IntentFilter("com.qf.broadcast.activity")); 24 } 25 class MyReceiver extends BroadcastReceiver{ 26 @Override 27 public void onReceive(Context context, Intent intent) { 28 Toast.makeText(context, "收到activity的广播", Toast.LENGTH_SHORT).show(); 29 30 } 31 } 32 33 @Override 34 public int onStartCommand(Intent intent, int flags, int startId) { 35 // TODO 每次启动Service都会执行的方法，在此实现核心的功能 36 Log.i("debug", "onStartCommand"); 37 38 Intent intent1=new Intent("com.qf.broadcast.disen_service"); 39 localBroadcastMgr.sendBroadcast(intent1); 40 41 return super.onStartCommand(intent, flags, startId); 42 } 43 44 45 46 @Override 47 public IBinder onBind(Intent intent) { 48 return null; 49 } 50 51 @Override 52 public void onDestroy() { //只执行一次，用于销毁Service组件 53 super.onDestroy(); 54 Log.i("debug", "onDestroy"); 55 localBroadcastMgr.unregisterReceiver(myReceiver); 56 } 57 58 }
1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2 xmlns:tools="http://schemas.android.com/tools" 3 android:layout_width="match_parent" 4 android:layout_height="match_parent" 5 android:paddingBottom="@dimen/activity_vertical_margin" 6 android:paddingLeft="@dimen/activity_horizontal_margin" 7 android:paddingRight="@dimen/activity_horizontal_margin" 8 android:paddingTop="@dimen/activity_vertical_margin" 9 tools:context=".MainActivity" > 10 11 <Button 12 android:id="@+id/btn1Id" 13 android:layout_width="wrap_content" 14 android:layout_height="wrap_content" 15 android:onClick="start" 16 android:text="启动服务" /> 17 18 <Button 19 android:id="@+id/btn2Id" 20 android:layout_width="wrap_content" 21 android:layout_height="wrap_content" 22 android:onClick="stop" 23 android:text="停止服务" 24 android:layout_below="@id/btn1Id"/> 25 <Button 26 android:id="@+id/btn3Id" 27 android:layout_width="wrap_content" 28 android:layout_height="wrap_content" 29 android:onClick="startService" 30 android:layout_below="@id/btn2Id" 31 android:text="向服务发广播" /> 32 33 </RelativeLayout>
1 <?xml version="1.0" encoding="utf-8"?> 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android" 3 package="com.qf.service01" 4 android:versionCode="1" 5 android:versionName="1.0" > 6 7 <uses-sdk 8 android:minSdkVersion="8" 9 android:targetSdkVersion="17" /> 10 11 <application 12 android:allowBackup="true" 13 android:icon="@drawable/ic_launcher" 14 android:label="@string/app_name" 15 android:theme="@style/AppTheme" > 16 <activity 17 android:name="com.qf.service01.MainActivity" 18 android:label="@string/app_name" > 19 <intent-filter> 20 <action android:name="android.intent.action.MAIN" /> 21 22 <category android:name="android.intent.category.LAUNCHER" /> 23 </intent-filter> 24 </activity> 25 26 <!-- 注册Service组件 --> 27 <service android:name="com.qf.service01.MyService"/> 28 </application> 29 30 </manifest>
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原文地址：http://www.cnblogs.com/bimingcong/p/4820386.html
