java - fragment 内的 WebView 返回按钮

Question

在 fragment 内，我使用WebView。当点击后退按钮

时，我只是查询 2 个选项

第一个 if; url.equals("www.google.com") [完美运行]

第二个 if; !url.equals("www.google.com") [不起作用]

我在 Debug模式下工作，但我的第二个 if 不起作用，即使 url 与“google.com”不同并关闭应用程序!

Fragment.Java

@Override
public void onResume() {
    super.onResume();

    if (getView() == null) {
        return;
    }

    getView().setFocusableInTouchMode(true);
    getView().requestFocus();

    getView().setOnKeyListener(new View.OnKeyListener() {
        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {

            if (event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK) {

                if(url.equals("https://www.google.com")){

                    //normal geri

                    final AlertDialog.Builder builder_question1 = new AlertDialog.Builder(getContext());
                    builder_question1.setTitle("Are you sure to close the app?");
                    builder_question1.setCancelable(true);
                    //POSITIVE BUTTON
                    builder_question1.setPositiveButton("yes",new DialogInterface.OnClickListener(){
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                            System.exit(0);

                        }
                    });

                    //NEGATIVE BUTTON
                    builder_question1.setNegativeButton("no",new DialogInterface.OnClickListener(){
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                            //do something...
                            //and dismiss
                            dialogInterface.dismiss();
                        }
                    });


                    builder_question1.create().show();



                }

                if(!url.equals("https://www.google.com")){
                   if(webView.canGoBack()){
                       webView.goBack();
                   }

                }
            }
            return true;
        }
    });



}

WebViewClient

webView.setWebViewClient(new WebViewClient() {
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            Toast.makeText(getContext(), ""+url, Toast.LENGTH_SHORT).show();
            super.onPageStarted(view, url, favicon);
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
            view.loadUrl(url);
            return super.shouldOverrideUrlLoading(view, request);
        }

        @Override
        public void onLoadResource(WebView view, String url) {


            super.onLoadResource(view, url);
        }

        @Override
        public void onPageFinished(WebView view, String url) {
           // Toast.makeText(getContext(), "page loaded", Toast.LENGTH_SHORT).show();
            super.onPageFinished(view, url);
        }

    });
    webView.loadUrl(url);

Answer 1

在包含 fragment 的 Activity 中应用后退按钮