一、環(huán)境

1. 安卓系統(tǒng)：4.2
2. 操作系統(tǒng)：Win 8.1
3. 工具：Android Studio

二惠豺、利用廣播開啟后臺服務(wù)

1. 定義一個廣播接收器類（MyBroadcastReceive）繼承自 BroadcastReceive，重寫里面的 onReceive 方法默责，即可在接收到廣播后做出相應(yīng)操作弛说。

public class MyBroadcastReceiver extends BroadcastReceiver {    
        private final String TAG = "MyBroadcastReceiver";   
 
        @Override    
        public void onReceive(Context context, Intent intent) {        
            //后邊的XXX.class就是要啟動的服務(wù)        
            Intent service = new Intent(context,NofyService.class);        
            context.startService(service);        
            Log.v(TAG, "onReceive");    
        }
}

2. 定義一個服務(wù)（MyService）繼承自 Service ，并重寫 onCreate秕铛、onStartCommand、onDestroy 方法即可缩挑。onCreate 方法在服務(wù)被創(chuàng)建時調(diào)用但两，onStartCommand 在服務(wù)開始后調(diào)用，如果 Activity 多次調(diào)用 Service供置，則只會在第一次調(diào)用 onCreate谨湘，其他都是調(diào)用 onStartCommand。

public class NofyService extends Service {    
        private final String TAG = "NofyService";    
        private Intent in;    
        private int flags;    
        private int startId;    

        @Nullable    
        @Override    
        public IBinder onBind(Intent intent) {        return null;    }    
    
        @Override    
        public void onCreate() {        
            Toast.makeText(getApplication(), "service", Toast.LENGTH_SHORT).show();        
            Log.v(TAG, "onCreate");    
        }    

        @Override    
        public int onStartCommand(Intent intent, int flags, int startId) {        
            this.in = intent;        
            this.flags = flags;        
            this.startId = startId; 
            new Thread(checkTime).start();        
            Toast.makeText(getApplication(), "service", 
            Toast.LENGTH_SHORT).show();        
            Log.v(TAG, "onStart");        
            return START_STICKY;    
        }    

        //Service 的功能芥丧，創(chuàng)建通知欄通知 
        Runnable checkTime = new Runnable() {        
            @Override        
            public void run() {            
                Calendar ca = Calendar.getInstance();
                //利用 Notification 類設(shè)置通知的屬性
                Notification notification = new Notification.Builder(getApplicationContext())                    
                    .setContentTitle("事件提醒")                    
                    .setContentText("有事件")
                    //不設(shè)置小圖標(biāo)通知欄顯示通知（不確定）
                    .setSmallIcon(R.mipmap.ic_launcher)                    
                    .build();
                notification.flags = Notification.FLAG_INSISTENT;
                //利用 NotificationManager 類發(fā)出通知欄通知
                NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);            
                nm.notify(1, notification);        
            }    
        };    

        @Override    
        public void onDestroy() {        
            this.onStartCommand(in, flags, startId);    
        }
}

3. 在 AndroidManifest.xml 注冊 MyBroadcastReceive紧阔。

<!-- 廣播接收器 -->
<receiver android:name=".broadcastReceiver.MyBroadcastReceiver">    
        <intent-filter >        
            <action android:name="com.cj_finger.broadcast" />    
        </intent-filter>
</receiver>

4. 在 AndroidManifest.xml 注冊 MyService。

<!-- 服務(wù) -->
<service    android:name=".service.NofyService"    android:process=":NofyService" >    
        <intent-filter>        
            <action android:name="com.cj_finger.service.NofyService" />    
        </intent-filter>
</service>

5. *添加開機啟動權(quán)限（開機啟動娄柳，有的手機廠家會屏蔽開機廣播）寓辱。

<!-- 開機自啟權(quán)限 -->
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

6. *還要設(shè)置 MyBroadcastReceive 的注冊信息艘绍。

<!-- 廣播接收器 -->
<receiver android:name=".broadcastReceiver.BootBroadcastReceiver">    
        <intent-filter >        
            <action android:name="android.intent.action.BOOT_COMPLETED" />        
            <category android:name="android.intent.category.LAUNCHER" />    
        </intent-filter>
</receiver>