Question

在加载Webview后，继续运行对话框不会消失。

public class MainActivity extends AppCompatActivity {

    private WebView webView;
    ProgressDialog pd;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        pd = ProgressDialog.show(MainActivity.this, "Progress Dialog", "Loading...");

        webView = (WebView) findViewById(R.id.webview);
        webView.setWebViewClient(new myWebClient());
        webView.getSettings().setJavaScriptEnabled(true);
        webView.loadUrl("http://kkgupta.mmiswebtech.com");



        webView.setWebViewClient(new WebViewClient() {
            public void onReceivedError(WebView webView, int errorCode, String description, String failingUrl) {
                try {
                    webView.stopLoading();
                } catch (Exception e) {
                }

                if (webView.canGoBack()) {
                    webView.goBack();
                }

                webView.loadUrl("file:///android_asset/error.html");
                AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
                alertDialog.setTitle("Error");
                alertDialog.setMessage("Check your internet connection and try again.");
                alertDialog.setButton(DialogInterface.BUTTON_POSITIVE, "Try Again", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        finish();
                        startActivity(getIntent());
                    }
                });

                alertDialog.show();
                super.onReceivedError(webView, errorCode, description, failingUrl);
            }
        });
    }

     class myWebClient extends WebViewClient
    {
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
        }


        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {

            view.loadUrl(url);
            return true;

        }
    }





    @Override
    // This method is used to detect back button
    public void onBackPressed() {
        if(webView.canGoBack()) {
            webView.goBack();
        } else {
            // Let the system handle the back button
            super.onBackPressed();
        }
    }
}

Answer 1

您需要将onPageFinished()添加到您的MyWebClient中，然后在您的ProgressDialog中调用dismiss()：

public void onPageFinished(WebView view, String url) {
    super.onPageFinished(view, url);
    pd.dismiss();
}

Answer 2

使用 pd.dismiss();

您要在其中关闭对话框。

Answer 3

注意：API级别26不推荐使用 ProgressDialog 。更好地使用ProgressBar

删除此代码：

using System;
using System.Linq;
using Microsoft.Extensions.DependencyInjection;

namespace WebApplication1
{
    public static class MyServiceExtensions
    {
        public static IServiceCollection Configure(this IServiceCollection services, Type type, Action<object> configureOptions)
        {
            // Static type that contains the extension method
            var extMethodType = typeof(OptionsServiceCollectionExtensions);

            // Find the overload for Configure<TOptions>(IServiceCollection, Action<TOptions>)
            // This could be more specific to make sure that all type arguments are exactly correct.
            // As it stands, this returns the correct overload but future updates to OptionsServiceCollectionExtensions
            // may add additional overloads which will require this to be updated.
            var genericConfigureMethodInfo = extMethodType.GetMethods()
                .Where(m => m.IsGenericMethod && m.Name == "Configure")
                .Select(m => new
                {
                    Method = m,
                    Params = m.GetParameters(),
                    Args = m.GetGenericArguments() // Generic Type[] (ex [TOptions])
                })
                .Where(m => m.Args.Length == 1 && m.Params.Length == 2
                    && m.Params[0].ParameterType == typeof(IServiceCollection))
                .Select(m => m.Method)
                .Single();

            var method = genericConfigureMethodInfo.MakeGenericMethod(type);

            // Invoke the method via reflection with our converted Action<objct> delegate
            // Since this is an extension method, it is static and services is passed
            // as the first parameter instead of the target object
            method.Invoke(null, new object[] { services, configureOptions });

            return services;
        }
    }
}

更改：

 webView.setWebViewClient(new WebViewClient() {
        public void onReceivedError(WebView webView, int errorCode, String description, String failingUrl) {
            try {
                webView.stopLoading();
            } catch (Exception e) {
            }

            if (webView.canGoBack()) {
                webView.goBack();
            }

            webView.loadUrl("file:///android_asset/error.html");
            AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
            alertDialog.setTitle("Error");
            alertDialog.setMessage("Check your internet connection and try again.");
            alertDialog.setButton(DialogInterface.BUTTON_POSITIVE, "Try Again", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    finish();
                    startActivity(getIntent());
                }
            });

            alertDialog.show();
            super.onReceivedError(webView, errorCode, description, failingUrl);
        }
    });
}

收件人：

 class myWebClient extends WebViewClient
    {
        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            super.onPageStarted(view, url, favicon);
        }


        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {

            view.loadUrl(url);
            return true;

        }
    }

加载Webview后不会关闭进度对话框

3 个答案: