Question

我正在尝试使用自定义HTML字符串填充我的WebView，并尝试在未加载时显示进度，并在完成后隐藏它。

这是我的代码：

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
  }
}

我收到此错误，但未指向我的代码中的任何一行：

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)

Answer 1

我有同样的问题。

 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)

我这样做如下：更改

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

以

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

因为不允许在Kotlinlang中使用null参数。只是将位图更改为位图？然后它会运作良好。希望这可以帮助其他人。

Answer 2

问题是方法onPageStarted（由系统调用）传递null参数的favicon值。当有一些与Java代码互操作的Kotlin代码时（默认情况下你应该得到可以为空的对象），这可能会发生。

Answer 3

private void initWebView() {
    webView.setWebChromeClient(new MyWebChromeClient(getActivity()));
        webView.setWebViewClient(new WebViewClient() {
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
                progressBar.setVisibility(View.VISIBLE);
                getActivity().invalidateOptionsMenu();
            }

            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                webView.loadUrl(url);
                return true;
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
                progressBar.setVisibility(View.GONE);
                getActivity().invalidateOptionsMenu();
            }

            @Override
            public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {
                super.onReceivedError(view, request, error);
                progressBar.setVisibility(View.GONE);
                getActivity().invalidateOptionsMenu();
            }
        });
        webView.clearCache(true);
        webView.clearHistory();
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setHorizontalScrollBarEnabled(false);
        webView.setOnTouchListener(new View.OnTouchListener() {
            public boolean onTouch(View v, MotionEvent event) {

                if (event.getPointerCount() > 1) {
                    //Multi touch detected
                    return true;
                }

                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN: {
                        // save the x
                        m_downX = event.getX();
                    }
                    break;

                    case MotionEvent.ACTION_MOVE:
                    case MotionEvent.ACTION_CANCEL:
                    case MotionEvent.ACTION_UP: {
                        // set x so that it doesn't move
                        event.setLocation(m_downX, event.getY());
                    }
                    break;
                }

                return false;
            }
        });
    }

    private class MyWebChromeClient extends WebChromeClient {
        Context context;

        public MyWebChromeClient(Context context) {
            super();
            this.context = context;
        }

    }

内部创建---

initWebView（）

binding.webView.loadUrl(urlName)

只需尝试一下，即可顺利加载Web视图URL。

java.lang.IllegalArgumentException：对于Kotlin和WebView，指定为非null的参数为null

3 个答案: