package com.example.hamza.myapplication;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.webkit.WebSettings;
    import android.webkit.WebView;
    import android.webkit.WebViewClient;
    import android.support.v7.app.ActionBarActivity;
    import android.os.Bundle;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.webkit.WebView;

    public class MainActivity extends AppCompatActivity {
        private WebView mywebview;
        @Override
            protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            mywebview=(WebView)findViewById(R.id.webView); //ERROR HAPPENS HERE
            WebSettings websettings = mywebview.getSettings();
            websettings.setJavaScriptEnabled(true);
            mywebview.loadUrl("http://www.google.com");
            mywebview.setWebViewClient(new WebViewClient());
        }

    @Override
    public void onBackPressed() {
        if (mywebview.canGoBack())
            mywebview.goBack();
        else
        super.onBackPressed();
    }
}