在android片段webview上实现后退按钮

Question

我想为我的webview片段实现后退按钮，在stackoverflow上尝试不同的答案，无法使用我的代码。

以下是我的代码。

public class LoginFragment extends Fragment {

    public LoginFragment(){}

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_login, container, false);

        WebView webView = (WebView) rootView.findViewById(R.id.webView);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setWebViewClient(new WebViewClient());
        webView.loadUrl("http://example.com/");

        return rootView;
    }
}

我甚至试过这个，在developer.android.com上找到它

public boolean WebViewGoBack() {
    if(webView.canGoBack()){
       webView.goBack();
       return true;
    }
    return false; 
}

感谢您的帮助。

Answer 1

试试这个：

@Override
public void onBackPressed() { 
    if (webView.canGoBack()) { //Gets whether this WebView has a back history item.
        webView.goBack(); //this takes to the previous page
    } else { 
        super.onBackPressed();// it finishes the current activity
    }
}

Answer 2

public class LoginFragment extends Fragment {

public LoginFragment(){}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_login, container, false);

    WebView webView = (WebView) rootView.findViewById(R.id.webView);
    webView.getSettings().setJavaScriptEnabled(true);
    webView.setWebViewClient(new WebViewClient());
    webView.loadUrl("http://example.com/");

    webView.setOnKeyListener(new OnKeyListener(){

        public boolean onKey(View v, int keyCode, KeyEvent event) {
              if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
                    handler.sendEmptyMessage(1);
                    return true;
                }
                return false;
        }
    });
    return rootView; 
}       
}
}