i have been trying to show adbob banner ad in one of my activities but i keep getting this weird error, i tried doing different things but none of them helped fix the problem, i am stuck on this please help me fix this error, Thank you. here is the logcat
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rewardoapps.network/com.rewardoapps.network.ChatActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.ads.AdView.loadAd(com.google.android.gms.ads.AdRequest)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.ads.AdView.loadAd(com.google.android.gms.ads.AdRequest)' on a null object reference
at com.rewardoapps.network.ChatActivity.onCreate(ChatActivity.java:44)
at android.app.Activity.performCreate(Activity.java:6975)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
here is my ChatActivity.java activity
public class ChatActivity extends ActivityBase implements MsgImageChooseDialog.AlertPositiveListener {
private AdView AdView;
Toolbar mToolbar;
Fragment fragment;
Boolean restore = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dialogs);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
MobileAds.initialize(this,
"ca-app-pub-3940256099942544~3347511713");
AdRequest adRequestBanner = new AdRequest.Builder().build();
AdView = (AdView)this.findViewById(R.id.adView);
AdView.loadAd(adRequestBanner);
if (savedInstanceState != null) {
fragment = getSupportFragmentManager().getFragment(savedInstanceState, "currentFragment");
restore = savedInstanceState.getBoolean("restore");
} else {
fragment = new ChatFragment();
restore = false;
}
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container_body, fragment)
.commit();
}
.xml layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.rewardoapps.network.ChatActivity" >
<LinearLayout android:id="@+id/container_toolbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <include android:id="@+id/toolbar" layout="@layout/toolbar" /> </LinearLayout>
<LinearLayout
android:id="@+id/container_a"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#00ffffff"
android:gravity="bottom|center_vertical|center_horizontal"
android:orientation="vertical"
android:visibility="visible">
<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
ads:adSize="BANNER"
ads:adUnitId="ca-app-pub-3940256099942544/6300978111"></com.google.android.gms.ads.AdView>
</LinearLayout>
<FrameLayout
android:id="@+id/container_body"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:visibility="visible" />
here is the ActivityBase.java
public class ActivityBase extends AppCompatActivity implements Constants {
public static final String TAG = "ActivityBase";
private ProgressDialog pDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initpDialog();
}
protected void initpDialog() {
pDialog = new ProgressDialog(this);
pDialog.setMessage(getString(R.string.msg_loading));
pDialog.setCancelable(false);
}
protected void showpDialog() {
if (!pDialog.isShowing()) {
try {
pDialog.show();
} catch (Exception e) {
e.printStackTrace();
}
}
}
protected void hidepDialog() {
if (pDialog.isShowing()) {
try {
pDialog.dismiss();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
