android webview上没有连接错误

我想显示无连接的自定义错误，但它不在下面的工作是代码，并在manifest.xml中提供了网络状态。 Connection（）正在检查类中的网络状态。希望这有助于解决问题。android webview上没有连接错误

package com.testing.webview; 

import android.app.Activity; 
import android.content.Context; 
import android.graphics.Color; 
import android.net.ConnectivityManager; 
import android.net.NetworkInfo; 
import android.os.Bundle; 
import android.view.KeyEvent; 
import android.webkit.WebView; 
import android.webkit.WebViewClient; 
import android.widget.Toast; 

public class MainActivity extends Activity { 
    public static final int DIALOG_NONETWORK = 0; 
    WebView mWebView; 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     if(!Connection()){ 
      Context context = getApplicationContext(); 
      CharSequence text = "Sorry you need an Internet connection! Please try again when the network is available."; 
      int duration = Toast.LENGTH_LONG; 
      Toast toast = Toast.makeText(context, text, duration); 
      toast.show(); 
      finish(); 
     } 

     mWebView = (WebView) findViewById(R.id.webview); 
     mWebView.getSettings().setJavaScriptEnabled(true); 
     mWebView.loadUrl("file:///android_asset/index.html"); 
     mWebView.setWebViewClient(new HelloWebViewClient()); 
     mWebView.setBackgroundColor(Color.TRANSPARENT); 
    } 


    public boolean Connection() { 
     ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
     NetworkInfo netInfo = cm.getActiveNetworkInfo(); 
     if (netInfo != null && netInfo.isConnectedOrConnecting()){ 
      return true; 
     } 
     else{ 
      return false; 
     } 
    } 


    private class HelloWebViewClient extends WebViewClient {   

     @Override 
     public boolean shouldOverrideUrlLoading(WebView view, String url) { 
      view.loadUrl(url); 
      return true; 
     } 
    } 

    @Override 
    public boolean onKeyDown(int keyCode, KeyEvent event) { 
     if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) { 
      mWebView.goBack(); 
      return true; 
     } 
     return super.onKeyDown(keyCode, event); 
    } 
}

来源

2012-02-06 James Mitchee

为什么在没有连接后完成活动？

有面包一样：

Toast.makeText(getApplicationContext(),"Network is down", 
         Toast.LENGTH_SHORT).show();

然后使视图呈现出来的某种按钮来“重试”的网络请求，这就是我会做的反正。敬酒当前没有出现，可能是因为活动在吐司后立即关闭，所以没有足够的时间显示它

来源

2012-02-06 22:56:47 Marty

android webview上没有连接错误

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