Android中的Webview只能在4.2+版本中使用，而不能在2.3.3中使用

Question

Application which works in Android 4.2.2 using webview javascriptInterface which is not working in Android 2.3.3.

It has targetSdkVersion="19"

and Build property as 4.2

I have created emulator with 2.3.3 and Device 3.7" WVGA.

OnCreate Here -

@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

I think you might have bumped into this known issue . And here's how to work around it: Handling Android 2.3 WebView's broken AddJavascriptInterface

Credits to the original poster here

In the future, consider describing your issues in more details. "which is not working" does not give any idea of the problem, so I just googled "javascriptinterface 2.3.3" -- then again, you could have done it yourself.

UPD You need to put the methods from the workaround as overrides to your WebViewClient . For your code, it should look something like this:

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) { ... }
    });
}

Answer 2

Kindly check in devices instead of Emulator. When i checked in Android 2.3.6 its worked well. Unfortunately i didn't get any 2.3.3 device which same as our emulator. If anyone have the device, Kindly check and Confirm me. Thanks a lot for the valuable comments.