android o android8.0 startforegroundservice startforegroundservice() did not then call service.star

解决context.startforegroundservice() did not then call service.startforeground()

原因：

Android 8.0 系统不允许后台应用创建后台服务，故只能使用Context.startForegroundService()启动服务
创建服务后，应用必须在5秒内调用该服务的 startForeground() 显示一条可见通知，声明有服务在挂着，不然系统会停止服务 + ANR 套餐送上。
Notification 要加 Channel，系统的要求。

解决步骤：

Service.java 中

    @Override    public void onCreate() {        super.onCreate();        if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.O) {            startFG();        }    }    private void startFG() {        NotificationBuilder builder = new NotificationBuilder(this);        final Notification notification = builder.buildNotification();        startForeground(NotificationBuilder.NOTIFICATION_ID, notification);    }

NotificationBuilder.java

public final class NotificationBuilder {    public static final String NOTIFICATION_CHANNEL_ID = "com.demo.CHANNEL_ID";    public static final int NOTIFICATION_ID = 0xD660;    private final Context mContext;    private final NotificationManager mNotificationManager;    public NotificationBuilder(Context context) {        mContext = context;        mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);    }    public Notification buildNotification() {        if (shouldCreateNowPlayingChannel()) {            createNowPlayingChannel();        }        NotificationCompat.Builder builder = new NotificationCompat.Builder(mContext, NOTIFICATION_CHANNEL_ID);        return builder.setSmallIcon(R.drawable.all_app_takeaway_icon)                .setContentTitle("")                .setContentTitle("")                .setOnlyAlertOnce(true)                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)                .build();    }    @RequiresApi(api = Build.VERSION_CODES.O)    private boolean nowPlayingChannelExists() {        return mNotificationManager.getNotificationChannel(NOTIFICATION_CHANNEL_ID) != null;    }    private boolean shouldCreateNowPlayingChannel() {        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.O && !nowPlayingChannelExists();    }    @RequiresApi(api = Build.VERSION_CODES.O)    private void createNowPlayingChannel() {        final NotificationChannel channel = new NotificationChannel(                NOTIFICATION_CHANNEL_ID,                "当前播放",                NotificationManager.IMPORTANCE_LOW);        channel.setDescription("当前播放的电台");        mNotificationManager.createNotificationChannel(channel);    }}

还要注意：

AndroidManifest.xml 中配置permission

启动Service方法：

        //后台启动service        if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.O) {            Intent serviceIntent = new Intent(this, DemoService.class);            startForegroundService(serviceIntent);        } else {            Intent serviceIntent = new Intent(this, DemoService.class);            startService(serviceIntent);        }

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