[Solved] Declare receiver in mainactivity

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Instead of registering receiver in manifest , register it in Activity and pass interface to interact on network state change

NetworkCallback.java

interface NetworkCallback{
  void onStateChange();
}

ConnectionBroadReceiver.java 

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class ConnectionBroadReceiver extends BroadcastReceiver {
   private NetworkCallback callback;

    public ConnectionBroadReceiver(NetworkCallback callback){
          this.callback = callback;
    }

    @Override
    public void onReceive(Context context, Intent intent) {

        ConnectivityManager cm = (ConnectivityManager)
                context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo netInfo = cm.getActiveNetworkInfo();

        if (netInfo != null && netInfo.isConnectedOrConnecting()) {
            callback.onStateChange();
        } else {
             callback.onStateChange();
        }    
    }
}

Now in your Ativity

public class MainActivity extends AppCompatActivity
{
    private WebView webView;

   public void onCreate(Bundle savedInstanceState){
    // you code to set content view
    webView = (WebView) findViewById(R.id.webview);        
    webView.postUrl(url, postData.getBytes());
    registerReceiver(new ConnectionBroadReceiver(new NetworkCallback(){
          @Override
          public void onStateChange(){
               webview.reload();
          }
     }),new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE")); 
  }
}

3

solved Declare receiver in mainactivity