我正在用Firebase和Kotlin编写一个Android应用程序。现在,我创建了一个扩展Service
类的 kotlin类。
问题是,启动服务后,如果我关闭应用程序,则该应用程序崩溃了!
如果我使用 java 编写相同的代码,则一切正常!我不明白为什么使用 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)
答案 0 :(得分:5)
您在intent
中声明onStartCommand
为非空:
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?
。
Reasons that the passed Intent would be NULL in onStartCommand
答案 1 :(得分:2)
如果您使用的是LifecycleService
,则此问题是AndroidX Lifecycle库的2.2.0-alpha02版本中的fixed。
您可以覆盖:
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int
(注意:Intent?
而非Intent
)
答案 2 :(得分:0)
Google 在 androidx.lifecycle:lifecycle-service:2.2.0
中修复了这个错误;