如何开始新活动从Android WebView JavaScript界面

Question

I'm working on android web application.

I want to start new activity from javascript.I googled and found a code to show toast.this is it.

    public class WebAppInterface {
            Context mContext;

            /** Instantiate the interface and set the context */
            WebAppInterface(Context c) {
                mContext = c;
            }

    /** Show a toast from the web page */
    @JavascriptInterface
    public void showToast(String toast) {
        Toast.makeText(mContext, toast, Toast.LENGTH_SHORT).show();
    }
}

That code is working fine. but when I try to start new activity nothing happen.here is my code(sorry for bad english)

    public class WebAppInterface {
    Context mContext;

    /** Instantiate the interface and set the context */
    WebAppInterface(Context c) {
        mContext = c;
    }

    /** Show a toast from the web page */
    @JavascriptInterface
    public void showToast(String toast) {
        Intent showAd = new Intent(getBaseContext(), ShowAd.class);
        startActivity(showAd);
    }
}

Answer 1

Try this:

In your javascript code

<script type="text/javascript">
 function moveToScreen() {
        Android.moveToNextScreen();
    }
</script>

In your java code:

public void moveToNextScreen(){

                             //Move to Next screen
                             Intent newintent = new Intent(FirstActivity.this, SecondIntent.class);  
                             startActivity(newintent);  

    }

Add these in your onCreate

webview.getSettings().setJavaScriptEnabled(true);

        webview.addJavascriptInterface(new WebAppInterface(this), "Android");
        //Load URL inside WebView
        webview.loadUrl("Your html page url");