Android通知栏前台服务的实现

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public class ForegroundService extends Service {
  
  private static final String TAG = ForegroundService.class.getSimpleName();

 @Override
  public void onCreate() {
    super.onCreate();
    Log.e(TAG, "onCreate");
  }
  
  @Nullable
  @Override
  public IBinder onBind(Intent intent) {
    Log.e(TAG, "onBind");
    return null;
  }

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

  @Override
  public void onDestroy() {
    Log.e(TAG, "onDestroy");
    super.onDestroy();
  }  
}

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/**
 * 创建服务通知
 */
private Notification createForegroundNotification() {
  NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

  // 唯一的通知通道的id.
  String notificationChannelId = "notification_channel_id_01";

  // Android8.0以上的系统，新建消息通道
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    //用户可见的通道名称
    String channelName = "Foreground Service Notification";
    //通道的重要程度
    int importance = NotificationManager.IMPORTANCE_HIGH;
    NotificationChannel notificationChannel = new NotificationChannel(notificationChannelId, channelName, importance);
    notificationChannel.setDescription("Channel description");
    //LED灯
    notificationChannel.enableLights(true);
    notificationChannel.setLightColor(Color.RED);
    //震动
    notificationChannel.setVibrationPattern(new long[]{0, 1000, 500, 1000});
    notificationChannel.enableVibration(true);
    if (notificationManager != null) {
      notificationManager.createNotificationChannel(notificationChannel);
    }
  }

  NotificationCompat.Builder builder = new NotificationCompat.Builder(this, notificationChannelId);
  //通知小图标
  builder.setSmallIcon(R.drawable.ic_launcher);
  //通知标题
  builder.setContentTitle("ContentTitle");
  //通知内容
  builder.setContentText("ContentText");
  //设定通知显示的时间
  builder.setWhen(System.currentTimeMillis());
  //设定启动的内容
  Intent activityIntent = new Intent(this, NotificationActivity.class);
  PendingIntent pendingIntent = PendingIntent.getActivity(this, 1, activityIntent, PendingIntent.FLAG_UPDATE_CURRENT);
  builder.setContentIntent(pendingIntent);

  //创建通知并返回
  return builder.build();
}

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@Override
public void onCreate() {
  super.onCreate();
  Log.e(TAG, "onCreate");
  // 获取服务通知
  Notification notification = createForegroundNotification();
  //将服务置于启动状态 ,NOTIFICATION_ID指的是创建的通知的ID
  startForeground(NOTIFICATION_ID, notification);
}

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@Override
public void onDestroy() {
  Log.e(TAG, "onDestroy");
  // 标记服务关闭
  ForegroundService.serviceIsLive = false;
  // 移除通知
  stopForeground(true);
  super.onDestroy();
}

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@Override
public int onStartCommand(Intent intent, int flags, int startId) {
  Log.e(TAG, "onStartCommand");
  // 标记服务启动
  ForegroundService.serviceIsLive = true;
  // 数据获取
  String data = intent.getStringExtra("Foreground");
  Toast.makeText(this, data, Toast.LENGTH_SHORT).show();
  return super.onStartCommand(intent, flags, startId);
}

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<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

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//启动服务
if (!ForegroundService.serviceIsLive) {
  // Android 8.0使用startForegroundService在前台启动新服务
  mForegroundService = new Intent(this, ForegroundService.class);
  mForegroundService.putExtra("Foreground", "This is a foreground service.");
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    startForegroundService(mForegroundService);
  } else {
    startService(mForegroundService);
  }
} else {
  Toast.makeText(this, "前台服务正在运行中...", Toast.LENGTH_SHORT).show();
}

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//停止服务
mForegroundService = new Intent(this, ForegroundService.class);
stopService(mForegroundService);