将 progressBar 可见性设置为消失时应用程序崩溃

Question

您好，我遇到了这个问题，我根本不明白我有一个选项卡 activity 并且每个片段中都有一个 webview，并且 webview 有一个进度条，显示它们何时加载但何时加载我将进度条可见性设置为消失应用程序崩溃 AVD 日志显示没有异常但是当我评论

    progressBar.setVisibility(View.GONE);

它根本不会崩溃，但进度条总是在那里，如果有人能告诉我问题出在哪里，我将非常感激，谢谢，这是我的代码

 package org.lsvbdarija.app;

    import android.content.Context;
    import android.content.Intent;
    import android.graphics.Bitmap;
    import android.net.ConnectivityManager;
    import android.net.NetworkInfo;
    import android.net.Uri;
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.support.annotation.Nullable;
    import android.support.v4.app.Fragment;
    import android.view.KeyEvent;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.webkit.WebSettings;
    import android.webkit.WebView;
    import android.webkit.WebViewClient;
    import android.widget.ProgressBar;

    /**
     * Created by Anas on 20/06/2016.
     */

    public class SocialFragment extends Fragment {

    public WebView mWebView;
    ProgressBar progressBar;

    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message message) {
            switch (message.what) {
                case 1: {
                    webViewGoBack();
                }
                break;
            }
        }
    };

    @Nullable
    @Override
    public View onCreateView(final LayoutInflater inflater, final ViewGroup container,
                             Bundle savedInstanceState) {
        if (!haveNetworkConnection()) {
            getActivity().setContentView(R.layout.activity_splashscreen);
        }

        View v = inflater.inflate(R.layout.social_layout, container, false);
        mWebView = (WebView) v.findViewById(R.id.webview);
        mWebView.loadUrl("http://www.lsvbdarija.com/search/label/%D8%B9%D9%84%D9%88%D9%85");

        // Enable Javascript
        WebSettings webSettings = mWebView.getSettings();
        webSettings.setJavaScriptEnabled(true);
        progressBar = (ProgressBar) getActivity().findViewById(R.id.progressBar);

        // Force links and redirects to open in the WebView instead of in a browser
        mWebView.setWebViewClient(new WebViewClient(){
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                // TODO Auto-generated method stub
                super.onPageStarted(view, url, favicon);
            }

            public boolean shouldOverrideUrlLoading(WebView view, String url) {

                String url2="http://www.lsvbdarija.com/";
                // all links  with in ur site will be open inside the webview
                //links that start ur domain example(http://www.example.com/)
                if (url != null && url.startsWith(url2)){
                    return false;
                }
                // all links that points outside the site will be open in a normal android browser
                else  {
                    view.getContext().startActivity(
                            new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
                    return true;
                }
            }
            public void onPageFinished(WebView view, String url) {
                // TODO Auto-generated method stub
                super.onPageFinished(view, url);

              //  progressBar.setVisibility(View.GONE);
            }
        });


        mWebView.setOnKeyListener(new View.OnKeyListener() {

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


        });

        return v;

    }


    private void webViewGoBack() {
        mWebView.goBack();
    }


    private boolean haveNetworkConnection() {
        boolean haveConnectedWifi = false;
        boolean haveConnectedMobile = false;

        ConnectivityManager cm = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo[] netInfo = cm.getAllNetworkInfo();
        for (NetworkInfo ni : netInfo) {
            if (ni.getTypeName().equalsIgnoreCase("WIFI"))
                if (ni.isConnected())
                    haveConnectedWifi = true;
            if (ni.getTypeName().equalsIgnoreCase("MOBILE"))
                if (ni.isConnected())
                    haveConnectedMobile = true;
        }
        return haveConnectedWifi || haveConnectedMobile;
    }



}

Answer 1

进度条是定义在fragment布局还是activity布局？如果它在片段中，那么它应该是

进度条 = (进度条) v.findViewById(R.id.progressBar);

Answer 2

将您的 get activity().findviewbyid() 替换为 v.findviewbyid();