Question

目前还不清楚如何实现导航/互联网连接错误。

我在这里尝试过代码Android WebView onReceivedError()

但它不起作用。

import android.app.Activity;
import android.net.ConnectivityManager;
import android.os.Build;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.Window;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private WebView view;
    private ImageView splashScreen;
    private ImageView logo;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(R.layout.activity_main);

        splashScreen =   (ImageView) this.findViewById(R.id.spscreen);

        logo =  (ImageView) this.findViewById(R.id.logo);

        String url = "some URL";
        view = (WebView)this.findViewById(R.id.webView1);

        view.setWebViewClient(new WebViewClient() {

            public void onPageFinished(WebView view, String url) {
                // do your stuff here
                logo.setVisibility(View.INVISIBLE);
                splashScreen.setVisibility(View.INVISIBLE);
                view.setVisibility(View.VISIBLE);
            }
        });


        WebSettings s = view.getSettings();
        s.setJavaScriptEnabled(true);

        s.setCacheMode(WebSettings.LOAD_DEFAULT);
        s.setDomStorageEnabled(true);


        view.loadUrl(url);
    }
}

Answer 1

嗯，这个

有2个选项

让loadUrl（）启动并稍后使用onReceivedError（）

处理错误

view.setWebViewClient(new WebViewClient() {
    @override
    public void onPageFinished(WebView view, String url) {
        // do your stuff here
        logo.setVisibility(View.INVISIBLE);
        splashScreen.setVisibility(View.INVISIBLE);
        view.setVisibility(View.VISIBLE);
    }

    @override
    void onReceivedError (WebView view, 
        WebResourceRequest request, 
        WebResourceError error){
            if(error.getErrorCode () == WebViewClient.ERROR_CONNECT || error.getErrorCode () == WebViewClient.ERROR_HOST_LOOKUP || WebViewClient.ERROR_TIMEOUT){
                Toast.makeText(context, "you are not connected!", Toast.LENGTH_LONG);
                //do other stuff, hide views ...
            }
        }
});

尝试处理所有连接错误full list of error codes can be found here

或者使用this answer中的isOnline（）方法来包装loadUrl（）调用 需要权限android.permission.ACCESS_NETWORK_STATE

if(!isOnline()){
    Toast.makeText(context, "you are not connected!", Toast.LENGTH_LONG);
}else{
    view.loadUrl(url);
}

如果您需要第一个选项，那可能会更好，因为在没有实际互联网连接的情况下连接到Wifi会给您错误的结果。

Android WebView导航错误消息

1 个答案: