Fragen Sie den Benutzer zu starten, WiFi oder 3G über das starten einer android-app, wenn keine Verbindung zum Internet

Eine android-app, greift auf die online-Seiten mithilfe von WebView ist, was ich arbeite. Ich will auch eine option, wo, wenn der Benutzer nicht mit dem internet verbunden, wird die Anwendung aufgefordert wird, schalten Sie auf WiFi oder 3G.

Was ist der beste Weg, dies zu erreichen Benutzerfreundlichkeit Sicht?

Den code ist unten angegeben:

package com.url.appname;


import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.Window;
import android.webkit.ValueCallback;
import android.webkit.WebView;
import android.webkit.WebChromeClient;
import android.webkit.WebViewClient;
import android.widget.Toast;

public class MainActivity extends Activity {

 private WebView wv;  


 private ValueCallback<Uri> mUploadMessage;  
 private final static int FILECHOOSER_RESULTCODE=1;

 @Override  
 protected void onActivityResult(int requestCode, int resultCode,  
                                    Intent intent) {  
  if(requestCode==FILECHOOSER_RESULTCODE)  
  {  
   if (null == mUploadMessage) return;  
            Uri result = intent == null || resultCode != RESULT_OK ? null  
                    : intent.getData();  
            mUploadMessage.onReceiveValue(result);  
            mUploadMessage = null;        
  }  
 }  

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


    wv = new WebView(this);
//   wv = (WebView) findViewById(R.id.webview);
    wv.loadUrl("http://www.url.com");



    //Let's display the progress in the activity title bar, like the
    //browser app does.
    getWindow().requestFeature(Window.FEATURE_PROGRESS);

    wv.getSettings().setJavaScriptEnabled(true);

    final Activity activity = this;

    wv.setWebViewClient(new WebViewClient(){    

       public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
             Toast.makeText(activity, "Oh no! " + description, Toast.LENGTH_SHORT).show();
           }
         });

    wv.setWebChromeClient(new WebChromeClient()  {  

           public void onProgressChanged(WebView view, int progress) {
                 //Activities and WebViews measure progress with different scales.
                 //The progress meter will automatically disappear when we reach 100%
                 activity.setProgress(progress * 100);
               }

        //For Android 3.0+
        public void openFileChooser( ValueCallback<Uri> uploadMsg, String acceptType ) {  
            mUploadMessage = uploadMsg;  
            Intent i = new Intent(Intent.ACTION_GET_CONTENT);  
            i.addCategory(Intent.CATEGORY_OPENABLE);  
            i.setType("image/*");  
            MainActivity.this.startActivityForResult( Intent.createChooser( i, "File Chooser" ), MainActivity.FILECHOOSER_RESULTCODE ); 
            }

        //For Android < 3.0
        public void openFileChooser( ValueCallback<Uri> uploadMsg ) {
            openFileChooser( uploadMsg, "" );
            }

        //For Android > 4.1
        public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture){
            openFileChooser( uploadMsg, "" );
            }

                                });
      setContentView(wv);      

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    //Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

}e