java.lang.IllegalArgumentException: Parameter spec

问题:

I am trying to populate my WebView with custom HTML string and trying to show progress when it is not loaded, and hide it when finished.

Here is my code:

webView.settings.javaScriptEnabled = true
webView.loadDataWithBaseURL(null, presentation.content, "text/html", "utf-8", null)

webView.webViewClient = object : WebViewClient() {

  override fun onPageStarted(view: WebView, url: String, favicon: Bitmap) {
    super.onPageStarted(view, url, favicon)
    webViewProgressBar.visibility = ProgressBar.VISIBLE
    webView.visibility = View.INVISIBLE
  }

  override fun onPageCommitVisible(view: WebView, url: String) {
    super.onPageCommitVisible(view, url)
    webViewProgressBar.visibility = ProgressBar.GONE
    webView.visibility = View.VISIBLE
  }
}

I am getting this error, which is not pointing to any line of my code:

E/AndroidRuntime: FATAL EXCEPTION: main

                                                                             java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter favicon
                                                                                 at com.hidglobal.tmt.app.mobiBadge.ui.presentation.PresentationActivity$showPresentation$1.onPageStarted(PresentationActivity.kt)
                                                                                 at com.android.webview.chromium.WebViewContentsClientAdapter.onPageStarted(WebViewContentsClientAdapter.java:215)
                                                                                 at org.chromium.android_webview.AwContentsClientCallbackHelper$MyHandler.handleMessage(AwContentsClientCallbackHelper.java:20)
                                                                                 at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                 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)

回答1:

The issue is that method onPageStarted is called (by the system) passing a null value for the favicon parameter. This may happen when there is some Kotlin code that is interoperating with Java code (by default you should get nullable objects)

回答2:

I have the same problem.

 java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter favicon
    at com.haoyong.szzc.module.share.view.activity.WebActivity$MyWebViewClient.onPageStarted(WebActivity.kt:0)
    at com.android.webview.chromium.WebViewContentsClientAdapter.onPageStarted(WebViewContentsClientAdapter.java:495)
    at com.android.org.chromium.android_webview.AwContentsClientCallbackHelper$MyHandler.handleMessage(AwContentsClientCallbackHelper.java:122)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5313)
    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:1116)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:809)

I just do it as follows: change

override fun onPageStarted(view: WebView, url: String, favicon: Bitmap) {
            super.onPageStarted(view, url, favicon)
        }

to

 override fun onPageStarted(view: WebView, url: String, favicon: Bitmap?) {
            super.onPageStarted(view, url, favicon)
        }

Because it is not allowed to use the null parameter in the Kotlinlang. just change the Bitmap to Bitmap? Then it will work well. Hope this can help the other people.