Question

在我的navigationDrawer菜单中，点击搜索会在webview中打开特定的fragment。工作正常，但当我按下webview时 - 而不是上次访问webscreen，它会回到我的主fragment。我怎么能解决这个问题？我在这里提供我的fragment java文件。请提及任何其他需要的代码（如果需要）来解决我的问题

public class GoogleFragment extends Fragment {

public WebView mWebView;

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

    View v = inflater.inflate(fragment_google, container, false);
    mWebView = (WebView) v.findViewById(webview);
    mWebView.loadUrl("https://google.com");

    // Enable Javascript
    WebSettings webSettings = mWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    //improve webview performance
    mWebView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
    mWebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
    mWebView.getSettings().setAppCacheEnabled(true);
    mWebView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
    webSettings.setDomStorageEnabled(true);
    webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
    webSettings.setUseWideViewPort(true);
    webSettings.setSavePassword(true);
    webSettings.setSaveFormData(true);
    webSettings.setEnableSmoothTransition(true);

    // Force links and redirects to open in the WebView instead of in a browser
    mWebView.setWebViewClient(new WebViewClient());

    return v;
}

}

Answer 1

我认为当您按下片段中的后退按钮时，我们需要在Activity中处理它，

您需要在主要活动中首先覆盖 onBackPressed（）方法，其中包含片段和全局分配您的Google片段中包含 Webview

注意：当您添加或替换片段时，请继续添加 TAG ，这对获取片段实例很有帮助。

@Override
    public void onBackPressed() {
     Fragment fragment = 
     getFragmentManager().findFragmentByTag("google_fragment");
     if (fragment instanceof GoogleFragment) {
        if (webView.canGoBack()) {
            webView.goBack();
        } else {
            super.onBackPressed();
        }
    }else{
       super.onBackPressed();
    }
}

Answer 2

public class GoogleFragment extends Fragment {

public WebView mWebView;

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

    View v = inflater.inflate(fragment_google, container, false);
    mWebView = (WebView) v.findViewById(webview);
    mWebView.loadUrl("https://google.com");

    // Enable Javascript
    WebSettings webSettings = mWebView.getSettings();
    webSettings.setJavaScriptEnabled(true);
    //improve webview performance


  mWebView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);

  mWebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
    mWebView.getSettings().setAppCacheEnabled(true);
    mWebView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
    webSettings.setDomStorageEnabled(true);
    webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
    webSettings.setUseWideViewPort(true);
    webSettings.setSavePassword(true);
    webSettings.setSaveFormData(true);
    webSettings.setEnableSmoothTransition(true);

    // Force links and redirects to open in the WebView instead of in a browser
    mWebView.setWebViewClient(new WebViewClient());

v.setFocusableInTouchMode(true);
v.requestFocus();

v.setOnKeyListener( new View.OnKeyListener()
{
@Override
public boolean onKey( View v1, int keyCode, KeyEvent event )
{
if( keyCode == KeyEvent.KEYCODE_BACK ) {


if(mWebView.canGoBack())
{
wView.goBack();
wView.getUrl();
}


return true;
}
return false;
}
} );
    return v1;
}
}

Please try this code .it may help you.

片段webview后退按钮不起作用

2 个答案: