package com.example.rocktest;

import com.mopub.mobileads.MoPubView;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends Activity {
    private MoPubView moPubView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        moPubView = (MoPubView) findViewById(R.id.adview);
        moPubView.setAdUnitId("0fe0525c6b80as2295fa123138070049");
        moPubView.loadAd();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    protected void onDestroy() {
        moPubView.destroy();
        super.onDestroy();
    }
}

FATAL EXCEPTION: main
Process: com.example.rocktest, PID: 16528
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.rocktest/com.example.rocktest.MainActivity}: java.lang.NullPointerException
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2436)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2495)
    at android.app.ActivityThread.access$900(ActivityThread.java:170)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1304)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:146)
    at android.app.ActivityThread.main(ActivityThread.java:5635)
    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:1291)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
    at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
    at com.example.rocktest.MainActivity.onCreate(MainActivity.java:19)
    at android.app.Activity.performCreate(Activity.java:5585)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2400)
    ... 11 more