<?xml version="1.0" encoding="utf-8"?>  

<manifest xmlns:android="http://schemas.android.com/apk/res/android"  

    package="abu.webview">  

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

    <application  

        android:allowBackup="true"  

        android:icon="@mipmap/ic_launcher"  

        android:label="@string/app_name"  

        android:roundIcon="@mipmap/ic_launcher_round"  

        android:supportsRtl="true"  

        android:theme="@style/AppTheme">  

        <activity android:name=".MainActivity">  

            <intent-filter>  

                <action android:name="android.intent.action.MAIN" />  

  

                <category android:name="android.intent.category.LAUNCHER" />  

            </intent-filter>  

        </activity>  

    </application>  

<?xml version="1.0" encoding="utf-8"?>  

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"  

    xmlns:app="http://schemas.android.com/apk/res-auto"  

    xmlns:tools="http://schemas.android.com/tools"  

    android:layout_width="match_parent"  

    android:layout_height="match_parent"  

    tools:context="abu.webview.MainActivity">  

  

    <android.support.v4.widget.SwipeRefreshLayout  

        android:id="@+id/swipe"  

        android:layout_width="match_parent"  

        android:layout_height="match_parent">  

  

        <WebView  

            android:id="@+id/webView"  

            android:layout_width="match_parent"  

            android:layout_height="match_parent"/>  

  

    </android.support.v4.widget.SwipeRefreshLayout>  

  

</android.support.constraint.ConstraintLayout> 

1. package abu.webview;  
2.   
3. import android.support.v4.widget.SwipeRefreshLayout;  
4. import android.support.v7.app.AppCompatActivity;  
5. import android.os.Bundle;  
6. import android.webkit.WebView;  
7. import android.webkit.WebViewClient;  
8.   
9. public class MainActivity extends AppCompatActivity {  
10.   
11. private WebView webView;

12. private Boolean connected;
    private String command;

13.   
14.    @Override  
15.     protected void onCreate(Bundle savedInstanceState) {  
16.         super.onCreate(savedInstanceState);  
17.         setContentView(R.layout.activity_main);  
18.             
19.        webView = (WebView) findViewById(R.id.webView);       webView.getSettings().setJavaScriptEnabled(true);  
20.      webView.getSettings().setAppCacheEnabled(true);  
21.     intetnet("https://www.google.com");
22.      
23.    webView.setWebViewClient(new WebViewClient(){  
24.   
25.             public void onReceivedError(WebView view, int errorCode, String description,                 String failingUrl) {  
26.   
27.                 webView.loadUrl("file:///android_assets/error.html");  
28.   
29.             }  
30.   
31.             public void onPageFinished(WebView view, String url) {  
32.                 // do your stuff here  
33.             }  
34.   
35.         });  
36.    }
38.   private void intetnet(final String url){
39.     check();
40.    if (connected){

               webView.loadUrl(url);
            } else {
                neoistone.message(this,null,"No intetnet");
            }

41.      }
42.   private void check(){
43.     try{

        command = "ping -c1 google.com";
        connected = (Runtime.getRuntime().exec(command).waitFor() ==0);
      }catch (Exception e){
       eoistone.message(this,e,null);
        }

44.   }
45. }