错误:java.lang.IllegalArgumentException:指定为非null的参数为空Firebase事务Kotlin [英] Error: java.lang.IllegalArgumentException: Parameter specified as non-null is null firebase transaction kotlin
问题描述
我正在尝试在Firebase数据库中增加一个整数,但是该应用程序崩溃了.
I am trying to increment an integer in Firebase database but, the app crashes.
abstract class BrowserActivity : ThemableBrowserActivity(),OnClickListener {
private var mAuth: FirebaseAuth? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
BrowserApp.appComponent.inject(this)
setContentView(R.layout.activity_main)
incrementId() //calling the function increment id
}
protected fun incrementId() {
val cUser = mAuth?.currentUser
val uid: String = cUser!!.uid
var databaseReference = FirebaseDatabase.getInstance().getReference("users").child(uid).child("id")
databaseReference!!.runTransaction(object : Transaction.Handler {
override fun doTransaction(mutableData: MutableData): Transaction.Result {
var count = mutableData.getValue(Int::class.java)
if (count == null) {
mutableData.setValue(1)
} else {
mutableData.setValue(count+1)
}
return Transaction.success(mutableData)
}
override fun onComplete(databaseError: DatabaseError, b: Boolean, dataSnapshot: DataSnapshot) {}
})
}
}
Logcat:
10-01 22:30:34.227 14674-14674/in.brew.meteor E/FileUtils:无法将捆绑软件写入存储 10-01 22:30:34.228 14674-14674/in.brew.meteor E/Android运行时:致命异常:主要 工艺:酿造流星,PID:14674 java.lang.IllegalArgumentException:指定为非null的参数为null:方法kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull,参数databaseError 在in.brew.meteor.browser.activity.BrowserActivity $ saveData $ 1.onComplete(BrowserActivity.kt) 在com.google.android.gms.internal.zzecm.run(未知来源) 在android.os.Handler.handleCallback(Handler.java:746) 在android.os.Handler.dispatchMessage(Handler.java:95) 在android.os.Looper.loop(Looper.java:148) 在android.app.ActivityThread.main(ActivityThread.java:5443) 在java.lang.reflect.Method.invoke(本机方法) 在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:728) 在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
10-01 22:30:34.227 14674-14674/in.brew.meteor E/FileUtils: Unable to write bundle to storage 10-01 22:30:34.228 14674-14674/in.brew.meteor E/AndroidRuntime: FATAL EXCEPTION: main Process: in.brew.meteor, PID: 14674 java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter databaseError at in.brew.meteor.browser.activity.BrowserActivity$saveData$1.onComplete(BrowserActivity.kt) at com.google.android.gms.internal.zzecm.run(Unknown Source) at android.os.Handler.handleCallback(Handler.java:746) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5443) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
数据库结构:
my-firebase-app-name-9c826
|__-users
|_-FZTuHfNiXoSWOLiNlSv9w1vVZj03 //uid: user id of current user
|__id: 1
我的Firebase规则: `我的Firebase规则:
My Firebase rules: `My Firebase rules:
{
"rules": {
".read": true,
".write": true
}
}
{
"rules": {
".read": true,
".write": true
}
}
推荐答案
With reference to this post, I am passing databaseError
as null
to onComplete
.
By default all variables in kotlin are non null. So, if I want to pass a null
parameter,
I have to add a ?
to the parameter, which in my case should be DatabaseError?
. So the onComplete
function should look like:
override fun onComplete(databaseError: DatabaseError?, b: Boolean, dataSnapshot: DataSnapshot) {}
这篇关于错误:java.lang.IllegalArgumentException:指定为非null的参数为空Firebase事务Kotlin的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!