今天用传统方式，直接在Android 10上直接调用startService方法启动service服务，没有多久就报ANR。如果手机熄灭的状态下，打调试包，控制台会报以下错误：
Caused by: java.lang.IllegalStateException: Not allowed to start service Intent { cmp=com.wong.testphone/.socket.MinaService }: app is in background uid UidRecord{9cd1107 u0a341 TPSL idle change:idle|cached procs:1 seq(0,0,0)}
　
Android 8.0+ 对特定函数做出了以下变更：

如果针对Android 8.0+的应用不允许创建后台服务，如果使用 startService() 函数，则引发 IllegalStateException异常。解决的办法是使用新的Context.startForegroundService() 函数将启动一个前台服务，并且service必须在创建服务后的五秒内调用该服务的 startForeground() 函数，否则将会报错。

解决示例：

Step 1:使用startForegroundService启动服务

public class MainActivity extends AppCompatActivity {
@Override
    public void onCreate() {
        super.onCreate();
        Intent intent = new Intent(getApplicationContext(), MinaService.class);
        if (Build.VERSION.SDK_INT >= 26) {
            startForegroundService(intent);
        } else {
            // Pre-O behavior.
            startService(intent);
        }
    }
...
}

Step 2:在service中５秒内必须调用startForeground

public class MinaService extends Service {

    private ConnectionThread thread;

    @Override
    public void onCreate() {
        super.onCreate();
        //全局context 避免内存泄漏，不多说
        thread = new ConnectionThread("mina", getApplicationContext());
        if (Build.VERSION.SDK_INT >= 26) {
        	NotificationChannel channel = new NotificationChannel(CHANNEL_ID,CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
        	NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        	manager.createNotificationChannel(channel);
	        Notification notification = new Notification.Builder(getApplicationContext(),CHANNEL_ID).build();
    	    startForeground(1, notification);
        }

    }
    ...
}