android - Android 中的 Webview 适用于 4.2+ 而不是 2.3.3

Question

在 Android 4.2.2 中使用 webview javascriptInterface 的应用程序在 Android 2.3.3 中不工作。

它有 targetSdkVersion="19"

和 Build 属性为 4.2

我已经用 2.3.3 和 Device 3.7"WVGA 创建了模拟器。

OnCreate 在这里 -

@JavascriptInterface
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    vWebview = (WebView) findViewById(R.id.vWebview);
    btnView = (Button) findViewById(R.id.btnView);
    txtView = (TextView) findViewById(R.id.txtView);

    vWebview.setWebChromeClient(new WebChromeClient());
    vWebview.setWebViewClient(new WebViewClient());

    try {
        if ("2.3".equals(Build.VERSION.RELEASE)) {
         javascriptInterfaceBroken = true;
        }
        } catch (Exception e) {
        // Ignore, and assume user javascript interface is working correctly.
        }

        // Add javascript interface only if it's not broken
        if (!javascriptInterfaceBroken) {
            vWebview.addJavascriptInterface(new JScriptInterface(),
                    "AndroidFunction");
        }



    WebSettings websetting = vWebview.getSettings();
    websetting.setJavaScriptEnabled(true);
    Log.d("Main", "Called");
    vWebview.loadUrl("file:///android_asset/sample.html");
    btnView.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            //vWebview.loadUrl("javascript:showAndroidToast('Hello')");
            try{
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    vWebview.loadUrl("javascript:showAndroidToast('Hello')");
                }
            });
        }
        catch(Exception ee){
            Log.d("Exception", "Called" + ee.toString());

        }
        }
    });

}

JsInterface-

public class JScriptInterface {

    public JScriptInterface() {
        // TODO Auto-generated constructor stub
    }



    public void showToast(String toast) {
        try{
        Log.d("JS", "Called" + toast);
        // txtView.setText(toast);
        Toast.makeText(MainActivity.this, toast, Toast.LENGTH_LONG).show();
        }
        catch(Exception ee){
            Toast.makeText(MainActivity.this, ee.toString(), Toast.LENGTH_LONG).show(); 

        }
    }



}

Answer 1

我想您可能遇到了 this known issue .以下是解决方法:Handling Android 2.3 WebView’s broken AddJavascriptInterface

致谢 original poster here

将来，请考虑更详细地描述您的问题。 “这不起作用”并没有给出任何问题的想法，所以我只是用谷歌搜索“javascriptinterface 2.3.3”——话又说回来，你可以自己完成。

UPD您需要将解决方法中的方法作为对您的 WebViewClient 的覆盖。对于您的代码，它应该看起来像这样:

vWebview.setWebChromeClient(new WebChromeClient());

try {
   if ("2.3".equals(Build.VERSION.RELEASE)) {
      javascriptInterfaceBroken = true;
   }
} catch (Exception e) {
   // Ignore, and assume user javascript interface is working correctly.
}
// Add javascript interface only if it's not broken
if (!javascriptInterfaceBroken) {
    vWebview.addJavascriptInterface(new JScriptInterface(),
            "AndroidFunction");
}

if (!javaScriptInterfaceBroken) vWebview.setWebViewClient(new WebViewClient());
else {
    vWebview.setWebViewClient(new WebViewClient() {
        // And here you put the code from the article
        @Override
        public void onPageFinished(WebView view, String url) { ... }

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