片段Android上的Internet连接错误

Question

即时通讯使用片段内的webview，我想添加Internet连接错误消息和加载进度栏，有人可以帮助这是我的

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class FoodFragment extends Fragment {


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_food, container, false);

    WebView webView = (WebView) view.findViewById(R.id.webView);
    webView.setWebViewClient(new WebViewClient());
    webView.getSettings().setJavaScriptEnabled(true);
    webView.loadUrl("http://food.pacho.co.ke/");

    return view;
}


}

Answer 1

您可以执行以下操作：

 public boolean isNetworkAvailable() {
    ConnectivityManager cm = (ConnectivityManager)
            getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = cm.getActiveNetworkInfo();
    if (networkInfo != null && networkInfo.isConnected()) {
        return true;
    }
    return false;
}

然后在您要检查连接的代码中：

  if(isNetworkAvailable())
 {
   // do things when connection is available
 }
 else
   {
    final android.app.AlertDialog.Builder alertDialog = new 
    android.app.AlertDialog.Builder(project_details.this);
    alertDialog.setMessage("You don't have internet connection").setNegativeButton("OK", new DialogInterface.OnClickListener() {
             @Override
      public void onClick(DialogInterface dialogInterface, int i) {
                dialog.dismiss();
              }
         });
    alertDialog.show();

}

我也认为您必须在清单中添加权限：

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

而且我不确定当您有网络但实际上没有Internet连接时是否可以使用。