Question

我正在使用代码创建WebView，而不是通过XML布局加载。 webview似乎已正确创建，但我看到错误：

W/AwContents( 4564): nativeOnDraw failed; clearing to background color.
I/chromium( 4564): [INFO:CONSOLE(1)] "Uncaught ReferenceError: Android is not defined", 
...

如果我将WebView放在XML布局中，我就不会遇到这些错误。请注意，如果脚本运行，它将从＆＃34; no＆＃34;更改onLoadEvent字段值。到了＃34;是的。这种情况正在发生，显然脚本正在运行。但是，它没有获取用户名和密码，表明＆＃34; Android＆＃34;没有定义。

我还尝试在webView.loadData（）之前执行addView（）;同样的错误。

这是创建WebView的代码：

  @SuppressLint("SetJavaScriptEnabled")
  private void onOk ()
  {
    Log.d ("RegTest", "onOk");
    webView = new WebView (this);
    webView.setLayoutParams (new ViewGroup.LayoutParams(
        ViewGroup.LayoutParams.MATCH_PARENT,
        ViewGroup.LayoutParams.MATCH_PARENT));    
    WebSettings webSettings = webView.getSettings();
    webSettings.setJavaScriptEnabled (true);
    CharSequence cs = readAsset ("input_form");
    webView.loadData (cs.toString(), "text/html", "UTF-8");

    contentView.addView (webView);
  }

以下是＆＃34; input_form＆＃34;的剪辑，它是WebView内容的来源：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
  ...
  <script type="text/javascript">
    function onLoadValues ()
    {
      document.getElementById ("onLoadEvent").value = "yes";
      document.getElementById ("FullName").value = Android.getFullName();
      document.getElementById ("EmailAddress").value = Android.getEmailAddr(); 
    }
  </script>
</head>

<body onload="onLoadValues()">
  <form name="catwebformform52174" method="post" ...>
    <fieldset>
      <div class="pure-control-group">
        <label for="onLoadValues">onLoadEvent</label>
        <input id="onLoadEvent" name="onLoadEvent" type="text" placeholder="no">
      </div>
      <div class="pure-control-group">
        <label for="FullName">Name</label>
        <input id="FullName" name="FullName" type="text" placeholder="Name">
      </div>
      <div class="pure-control-group">
        <label for="EmailAddress">Email Address</label>
        <input id="EmailAddress" name="EmailAddress" type="email" placeholder="Email Address">
      </div>
    </fieldset>
  </form>
</body>
</html>

Answer 1

您没有将 Android 定义为javascripinterface，您必须在下面写一行

 // If your callback methods are in same class then just same class object
 webView.addJavascriptInterface(this, "Android");

addJavascriptInterface（）方法的语法

      addJavascriptInterface(Object object, String name);        
   //  1. `object` – *the Java object to inject into this WebView’s JavaScript context.*
   //  2. `name` – *the name used to expose the object in JavaScript*

WebView：未捕获的ReferenceError：未定义Android

1 个答案: