分類

• 按綁定方式劃分
  1>綁定Service
  2>非綁定Service
• 按Service類型劃分
  1>后臺(tái)服務(wù)，Android開發(fā)中多數(shù)用后臺(tái)Service，這種Service的優(yōu)先級(jí)比較低，當(dāng)系統(tǒng)內(nèi)存不足，會(huì)被回收
  2>前臺(tái)服務(wù)，就是Service和Notification關(guān)聯(lián)，用戶可見的服務(wù)，不會(huì)因?yàn)閮?nèi)存不足而被回收，簡單理解就是音樂播放器的通知欄彈窗

后臺(tái)服務(wù)

• 啟動(dòng)方式
  1> 非綁定Service啟動(dòng)

                startService(new Intent().setClass(ServiceDemoActivity.this,NoBindService.class));

2>綁定Service啟動(dòng)

                Intent intent = new Intent().setClass(ServiceDemoActivity.this, BindService.class);
                    bindService(intent,connect,BIND_AUTO_CREATE);

綁定Service需要?jiǎng)?chuàng)建connect，實(shí)現(xiàn)Activity和Service的連接

    private BindService.MyBinder mService = null;

    //Service的連接
    private ServiceConnection connect = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
            mService  = (BindService.MyBinder) iBinder;
            mService.methodInBindServiceUsedByActivity();
        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {

        }
    };

前臺(tái)服務(wù)

• 創(chuàng)建 ,跟后臺(tái)Service創(chuàng)建方式一樣，寫個(gè)Service類繼承自Service

public class FrontService extends Service {
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }
}

• 構(gòu)建通知消息
  在Service的onCreate中添加如下代碼構(gòu)建Notification

   @Override
    public void onCreate() {
        super.onCreate();
        // 創(chuàng)建通知
        Bitmap largeIcon = BitmapFactory.decodeResource(getResources(),R.drawable.test1);
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            NotificationChannel channel = new NotificationChannel("channel_id","前臺(tái)通知",NotificationManager.IMPORTANCE_DEFAULT);
            notificationManager.createNotificationChannel(channel);
        }

        Notification notification = new NotificationCompat.Builder(this,"channel_id")
                                        .setContentTitle("標(biāo)題")
                                        .setContentText("內(nèi)容")
                                        .setLargeIcon(largeIcon)
                                        .setSmallIcon(R.drawable.ic_launcher)
                                        .build();
        Log.d(TAG, "onStartCommand: 前臺(tái)服務(wù)啟動(dòng)");
        /**
         * 開啟前臺(tái)服務(wù)
         * @parame1是服務(wù)的唯一標(biāo)識(shí)
         * @param2是通知
         */
        startForeground(1, notification);
    }