Facebook的类似确认打开confirm_widget在新的窗口。所以，你的WebView应支持多窗口开启。这setJavaScriptCanOpenWindowsAutomatically（真）和setSupportMultipleWindows（真）为您webview-

Facebook like confirmation opens confirm_widget in new window. So your webview should support Multiple Window opening. for this setJavaScriptCanOpenWindowsAutomatically(true) and setSupportMultipleWindows(true) for your webview-

 private void setUpWebView() {
    likeWebView = new WebView(getContext());
    likeWebView.setWebViewClient(new FacebookWebViewClient());
    likeWebView.setWebChromeClient(new MyChromeClient());
    final WebSettings webSettings = likeWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
    webSettings.setSupportMultipleWindows(true);
    String url = getFacebookLikeUrl();
    likeWebView.loadUrl(url);
    likeWebView.setLayoutParams(FILL);
    mContent.addView(likeWebView);
}

Facebook的喜欢确认调用onCreateWindow（）方法。 SO覆盖onCreateWindow方法WebChromeClient -

Facebook like confirmation calls onCreateWindow() method. SO override the onCreateWindow method in WebChromeClient -

final class MyChromeClient extends WebChromeClient {

    // Add new webview in same window
    @Override
    public boolean onCreateWindow(WebView view, boolean dialog,
            boolean userGesture, Message resultMsg) {
        WebView childView = new WebView(getContext());
        childView.getSettings().setJavaScriptEnabled(true);
        childView.setWebChromeClient(this);
        childView.setWebViewClient(new FacebookWebViewClient());
        childView.setLayoutParams(FILL);
        mContent.addView(childView);
        WebView.WebViewTransport transport = (WebView.WebViewTransport) resultMsg.obj;
        transport.setWebView(childView);
        resultMsg.sendToTarget();
        return true;
    }

    // remove new added webview whenever onCloseWindow gets called for new webview.
    @Override
    public void onCloseWindow(WebView window) {
        mContent.removeViewAt(mContent.getChildCount() - 1);
    }
}

confirm_widget像呼叫onCloseWindow当用户点击要么喜欢或取消。在此方法删除最后添加的WebView。

confirm_widget for like calls onCloseWindow when user click either Like or Cancel. On this method remove last added webview.