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

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

原因：

1. 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
2. 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。
3. 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

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

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);
}

最后

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