使用Kotlin语言时Android服务崩溃

Question

我正在用firebase和kotlin编写一个android应用程序。现在，我创建了一个可扩展类的kotlinService类。

问题是，启动服务后，如果我关闭该应用程序，它将崩溃！

如果我用java编写相同的代码，一切正常！我不明白为什么在使用Kotlin时会崩溃？

看下面的代码。

myService.kt

class myService : Service() {
    internal var TAG = "tagForLogD"

    override fun onBind(p0: Intent?): IBinder? {
        return null
    }

    override fun onCreate() {
        super.onCreate()
        Log.d(TAG, "myService Created!")
    }

    override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int {
        return Service.START_STICKY
    }

    override fun onDestroy() {
        super.onDestroy()
        Log.d(TAG, "myService destroyed")
    }
}

myService.java

public class myService extends Service {
    String TAG = "tagForLogD";

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate(){
        super.onCreate();
        Log.d(TAG, "myService Created!");
    }

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

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

感谢您的支持。

Logcat引发波纹管异常

03-10 15:13:53.847 4911-4911/net.beingup.simplechat E/AndroidRuntime: FATAL EXCEPTION: main
    Process: net.beingup.simplechat, PID: 4911
    java.lang.RuntimeException: Unable to start service net.beingup.simplechat.Notification.myService@11a4382f with null: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter intent
        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3975)
        at android.app.ActivityThread.access$2300(ActivityThread.java:218)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1842)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:145)
        at android.app.ActivityThread.main(ActivityThread.java:7007)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
     Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter intent
        at net.beingup.simplechat.Notification.myService.onStartCommand(myService.kt)
        at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3958)

Answer 1

您在以下位置声明intent为非空值onStartCommand：

override fun onStartCommand(intent: Intent, flags: Int, startId: Int): Int

指定为非null的参数为null：方法kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull，参数意图

因此，将其声明为Intent?。

onStartCommand中传递的Intent为NULL的原因