WebView acusa java.lang.NullPointerException

Mobile
,
#1

Boa noite pessoal, estou tentando fazer com que uma webview carregue um endereço, mas não carrega e ao tentar execução ele dá erro com o log: java.lang.NullPointerException.

eis o código da classe abaixo:

import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;
import android.widget.Toast;

import org.w3c.dom.Text;

public class PromocoesActivity extends AppCompatActivity {

private WebView webView;

    String site = "https://kpopstation.com.br/novo/promocoes";


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

        webView = (WebView)findViewById(R.id.promocoesView);
        webView.setWebViewClient(new WebViewClient());
        Log.e("erro na webview", "algo saiu errado na execução da webview");
        webView.getSettings().setJavaScriptEnabled(true);
        webView.loadUrl(site);

        }

        public void onBackPressed()
        {
            if(webView.canGoBack())
            {
             webView.canGoBack();
            }
            else {
                super.onBackPressed();
            }
        }

}

um log mais detalhado:

    java.lang.RuntimeException: Unable to start activity ComponentInfo{app.com.br./app.PromocoesActivity}: java.lang.NullPointerException
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
        at android.app.ActivityThread.access$800(ActivityThread.java:135)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:136)
        at android.app.ActivityThread.main(ActivityThread.java:5017)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:515)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
        at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NullPointerException
#2

Pelo que me parece tu esqueceu o setContentView(R.layout.seuLayoutAqui);