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 }
MainActivity.java
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 }
Service.java
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>
activity_main.xml
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>
AndroidManifest.xml
时间： 2024-08-06 03:42:12