درود;

این رو تست کنین

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebResourceError;
import android.webkit.WebResourceRequest;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
import android.annotation.TargetApi;


public class Main extends Activity {


private WebView mWebview ;


@Override
public void onCreate(Bundle savedInstanceState) {


super.onCreate(savedInstanceState);


mWebview = new WebView(this);


mWebview.getSettings().setJavaScriptEnabled(true); // enable javascript


final Activity activity = this;


mWebview.setWebViewClient(new WebViewClient() {
@SuppressWarnings("deprecation")
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(activity, description, Toast.LENGTH_SHORT).show();
}
@TargetApi(android.os.Build.VERSION_CODES.M)
@Override
public void onReceivedError(WebView view, WebResourceRequest req, WebResourceError rerr) {
// Redirect to deprecated method, so you can use it in all SDK versions
onReceivedError(view, rerr.getErrorCode(), rerr.getDescription().toString(), req.getUrl().toString());
}
});


mWebview .loadUrl("http://www.google.com");
setContentView(mWebview );


}


}