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How should I correctly put some Fragment to FrameLayout in mainActivity?

I'm trying to put fragment in MainActivity's FrameLayout by clicking the button in MainActivity. It almost works, but the content of MainActivity's FrameLayout doesn't get replaced by the Fragment content, but added to it. So the question is: how to make it correct?
My MainActivity class
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = findViewById(R.id.pushMeBtn);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FragmentManager f_m = getSupportFragmentManager();
FragmentTransaction f_t = f_m.beginTransaction();
f_t.replace(R.id.container_layout, new Fragment1()).addToBackStack(null).commit();
}
});
}
}
My activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<FrameLayout
android:id="#+id/container_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/pushMeBtn"
android:text="push me"
android:layout_gravity="center"/>
</FrameLayout>
</RelativeLayout>
My Fragment1 class
public class Fragment1 extends Fragment {
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment1, container,false);
}
}
My fragment.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:background="#color/colorPrimary">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="339dp"
android:gravity="center"
android:text="fragment1"
android:textSize="25sp"/>
</RelativeLayout>

RecyclerView not replacing detail pane with fragment on item click

Everytime I click a recycler view item on a tablet, it opens an activity rather than replacing the detail pane with a fragment.
The following line of code is what I use to detect wheter the detail pane is present:
mTwoPane = Objects.requireNonNull(getActivity()).findViewById(R.id.detail_container) != null;
Any ideas on the correct location to put this line of code?
activity XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.widget.Toolbar
android:id="#+id/masterToolbar"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
>
<LinearLayout
android:id="#+id/singleline_text_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="vertical">
<TextView
android:id="#+id/md_toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#android:style/TextAppearance.Material.Widget.ActionBar.Title"/>
</LinearLayout>
</android.widget.Toolbar>
<RelativeLayout
android:id="#+id/master_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</LinearLayout>
sw600dp activity XML
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.widget.Toolbar
android:id="#+id/masterToolbar"
android:layout_width="0dp"
android:layout_height="?actionBarSize"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="#+id/detailBackgroundToolbar"
app:layout_constraintHorizontal_weight="2"
app:layout_constraintTop_toTopOf="parent">
<LinearLayout
android:id="#+id/singleline_text_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:orientation="vertical">
<TextView
android:id="#+id/md_toolbar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="#android:style/TextAppearance.Material.Widget.ActionBar.Title"/>
</LinearLayout>
</android.widget.Toolbar>
<RelativeLayout
android:id="#+id/master_container"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintHorizontal_weight="2"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="#+id/divider"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#+id/masterToolbar" />
<View
android:id="#+id/divider"
android:layout_width="1dp"
android:layout_height="0dp"
android:background="?attr/dividerColor"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toEndOf="#+id/masterToolbar"
app:layout_constraintTop_toBottomOf="#+id/masterToolbar" />
<android.widget.Toolbar
android:id="#+id/detailBackgroundToolbar"
android:layout_width="0dp"
android:layout_height="?actionBarSize"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_weight="3"
app:layout_constraintStart_toEndOf="#+id/masterToolbar"
app:layout_constraintTop_toTopOf="parent" />
<android.support.v7.widget.CardView
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_margin="4dp"
app:cardCornerRadius="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/divider"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintWidth_percent="0.5">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include layout="#layout/toolbar_dualline"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<FrameLayout
android:id="#+id/detail_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</android.support.v7.widget.CardView>
<View
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/divider"
app:layout_constraintTop_toBottomOf="#+id/detailBackgroundToolbar" />
</android.support.constraint.ConstraintLayout>
Fragment class
public class MyFragment extends Fragment {
public MyFragment() {}
List<Product> wcList;
RecyclerView mRecyclerView;
/**
* Whether or not the activity is in two-pane mode, i.e. running on a tablet device.
*/
public boolean mTwoPane;
public static MyFragment newInstance() {
return new MyFragment();
}
#Override
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_main, container, false);
mTwoPane = Objects.requireNonNull(getActivity()).findViewById(R.id.detail_container) != null;
mRecyclerView = view.findViewById(R.id.recyclerView_list);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this.getActivity()));
mRecyclerView.addItemDecoration(new DividerItemDecoration(Objects.requireNonNull(getContext()), LinearLayout.VERTICAL));
myList = new ArrayList<>();
String[] items = getResources().getStringArray(R.array.product_names);
String[] itemDescriptions = getResources().getStringArray(R.array.product_descriptions);
for (int n = 0; n < items.length; n++){
Product desserts = new Product();
desserts.setProductName(items[n]);
wdessertsc.setProductDescriptions(itemDescriptions[n]);
myList.add(desserts);
}
MyListAdapter listAdapter = new MyListAdapter(getActivity(), myList);
mRecyclerView.setAdapter(listAdapter);
return view;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
mTwoPane = Objects.requireNonNull(getActivity()).findViewById(R.id.detail_container) != null;
super.onActivityCreated(savedInstanceState);
}
}
Adapter class
public class MyListAdapter extends RecyclerView.Adapter<MyListAdapter.MyViewHolder> {
public boolean mTwoPane;
private Context mCtx;
private List<Product> myList;
public MyListAdapter(Context mCtx, List<Product> myList) {
this.mCtx = mCtx;
this.myList = myList;
}
#NonNull
#Override
public MyListAdapter.MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(mCtx);
View view = inflater.inflate(R.layout.listitem_dualline, parent,false);
return new MyListAdapter.MyViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull final MyListAdapter.MyViewHolder holder, final int position) {
Log.d(TAG, "onBindViewHolder: called.");
final Product product = myList.get(holder.getAdapterPosition());
holder.textviewTitle.setText(product.getProductName());
holder.textviewSubtitle.setText(product.getPRoductDescription());
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mTwoPane) {
Fragment newFragment;
if (product.getStationName().equals(v.getResources().getString(R.string.product_1))) {
newFragment = new FragmentProduct1();
} else {
newFragment = new FragmentProdcut2();
}
MyActivity activity = (MyActivity) v.getContext();
FragmentTransaction transaction = activity.getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.detail_container, newFragment);
transaction.commit();
} else {
Intent intent;
if (product.getStationName().equals(v.getResources().getString(R.string.product_1))) {
intent = new Intent(v.getContext(), Product1Activity.class);
} else {
intent = new Intent(v.getContext(), Product2Activity.class);
}
mCtx.startActivity(intent);
}
}
});
}
#Override
public int getItemCount() {
return myList.size();
}
class MyViewHolder extends RecyclerView.ViewHolder {
RelativeLayout relativeLayout;
TextView textviewTitle, textviewSubtitle;
StationViewHolder(View itemView) {
super(itemView);
mTwoPane = itemView.findViewById(R.id.detail_container) != null;
relativeLayout = itemView.findViewById(R.id.listitem_relativelayout);
textviewTitle = itemView.findViewById(R.id.listitem_title);
textviewSubtitle = itemView.findViewById(R.id.listitem_subtitle);
}
}
}

This line mTwoPane = itemView.findViewById(R.id.detail_container) != null; from your view holder will always be false.
Why?
Because, your detail_container is not part of your view holder's item container, so itemView will always return null for your view. instead pass your boolean flag from your fragment to your adapter !

I think you are checking item two pan with recyclerview item xml
mTwoPane = itemView.findViewById(R.id.detail_container) != null;
That you can check while constructing recyclerview adapter and save it from the activity content view itself.

Get textView value from fragment to MainActivity

I am using fragments. I have an textview in fragment and I want to get value in main activity.
This is my fragment layout
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/GridLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="30dp"
android:layout_marginEnd="50dp"
android:layout_marginStart="55dp"
android:layout_marginTop="10dp"
android:columnCount="20"
android:orientation="horizontal"
android:rowCount="16"
tools:context="com.lipi.worldofelements.MainFragment">
<Space
android:layout_width="25dp"
android:layout_height="35dp"
android:layout_column="2"
android:layout_row="2"
android:background="#color/colorButtonNobelGasses" />
<LinearLayout
android:layout_width="505dp"
android:layout_height="165dp"
android:layout_column="4"
android:layout_columnSpan="13"
android:layout_margin="5dp"
android:layout_row="2"
android:layout_rowSpan="5"
android:orientation="horizontal"
>
<RelativeLayout
android:id="#+id/btnElement"
android:layout_width="165dp"
android:layout_height="match_parent"
android:background="#color/colorButtonNonmetals"
android:clickable="true"
>
<TextView
android:id="#+id/txtElemSym"
style="#style/AppTheme"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="25dp"
android:clickable="true"
android:gravity="center"
android:linksClickable="true"
android:onClick="btnClikcedToast"
android:text="#string/H"
android:textColor="#ffff"
android:textSize="#dimen/buttonXL"
/>
I am loading fragment with this function inside my MainActivity.java:
//Set the fragment activity
MainFragment fragment = new MainFragment();
FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
This my fragment class
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
databaseHelper = new ElementDatabaseAdapter(getActivity());
txtElemSym = (TextView) rootView.findViewById(R.id.txtElemSym);
return rootView;
When I click the textview(txtElemSym) main activity runs "btnClikcedToast" function inside my MainActivity .
public void btnClikcedToast(View view) {
txtSymbol = (TextView) findViewById(R.id.txtElemSym);
String ElemSymbol = (String) txtSymbol.getText();
Bundle b;
Intent i = new Intent(this, SingleElementData.class);
b = ActivityOptions.makeScaleUpAnimation(view, 0, 0, view.getWidth(), view.getHeight()).toBundle();
i.putExtra("symbol", ElemSymbol);
startActivity(i, b);
}
I want to get textvalue in this function. I got an error "NullPointerException" after I run this.
How can I do this?

How to solve fragment overlap?

In fragment A, it has listView. When the list is clicked, it should pass the data to fragment B.
A.java
B fragment2 = new B();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.fragment1, fragment2);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
B.java
public class B extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.b, container, false);
Log.d("TAG","fragment2");
return view;
}
}
a.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragment1"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="#string/some_text"
android:textSize="20sp" />
<ListView
android:id="#+id/listView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
</FrameLayout>
b.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:fillViewport="false">
<AbsoluteLayout
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="218dp"
android:layout_height="47dp"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Update Page"
android:id="#+id/textView114"
android:layout_x="12dp"
android:layout_y="20dp" />
</AbsoluteLayout>
</ScrollView>
This is how my Fragment A looked like.
When the list is clicked.
What's wrong here :?

in your a.xml use the following :
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragment1"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="10dp"
android:text="#string/app_name"
android:textSize="20sp" />
<ListView
android:id="#+id/listView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
</FrameLayout>

I think may be your problem in instantiating the EditText fields, you'd better declare your items after the view is created, so you have to override the method onViewCreated and make your declarations in it, then put your database work in a try-catch block to make sure it isn't the reason of any problems:
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
name3 = (EditText) view.findViewById(R.id.editText9);
date3 = (EditText) view.findViewById(R.id.editText12);
Bundle bundle = this.getArguments();
date = bundle.getString("date1");
ID = bundle.getString("ID");
RetrievePage(date, ID);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.b, container, false);
return view;
}
public void RetrievePage(String date, String id) {
final String date2 = date;
final String id2 = id;
Log.d("m", id2);
name3.setText("Lim ");
date3.setText(date2);
try {
database = dbHelper.getWritableDatabase();
c = database
.rawQuery(
"SELECT i.Weather FROM Information i LEFT JOIN WorkForce w ON w.TInfo_id = i._id WHERE i.Name = ? AND i._id= ? ",
new String[] { String.valueOf("Lim"),
String.valueOf(id2) }, null);
if (c != null) {
while (c.moveToNext()) {
Info I = new Info();
Force WF = new Force();
String Weather = c.getString(c
.getColumnIndexOrThrow(MyDatabaseHelper.Weather));
}
}
c.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
About fragments overlapping, you must declare each fragment as a separated fragment, and the main FragmentActivity is the activity that holds the fragments which in your case must be an empty activity with only the ViewPager or FrameLayout that contain fragments:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/bg" >
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/ac_pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.9" />
</RelativeLayout>
So, you must have MainActivity that contains two fragments FragmentA and FragmentB
for reference look at this answer.

Can't get Admob to show on multiple layouts?

I am trying to get Admob to display on my layout_one.xml and layout_two and can't get it to show. This app has a lot of swipe left and right and I want to display one ad over both layouts
Here are all my xml layouts:
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/pager">
</android.support.v4.view.ViewPager>
layout_one.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="#+id/relative_one"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#000000"
android:focusable="true"
android:focusableInTouchMode="true"
android:orientation="vertical">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Copy"
android:id="#+id/Copy"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:layout_alignParentEnd="false"
android:layout_alignParentStart="false"
android:textSize="30sp"
android:onClick="onClickCopy"/>
<EditText
android:layout_width="300dp"
android:layout_height="50dp"
android:id="#+id/stringCopy"
android:layout_above="#+id/Copy"
android:layout_centerHorizontal="true"
android:layout_marginBottom="70dp"
android:textSize="30sp"
android:inputType="text"
android:gravity="left|top"
android:background="#ffffff" />
<com.google.android.gms.ads.AdView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
ads:adSize="BANNER"
ads:adUnitId="#string/banner_ad_unit_id"/>
layout_two.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/relative_one"
android:background="#000000"
android:focusable="true"
android:focusableInTouchMode="true"
android:orientation="vertical">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Paste"
android:id="#+id/Paste"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:layout_alignParentEnd="false"
android:layout_alignParentStart="false"
android:textSize="30sp"
android:onClick="onClickPaste"/>
<EditText
android:layout_width="300dp"
android:layout_height="50dp"
android:id="#+id/stringCopy"
android:layout_marginBottom="71dp"
android:textSize="30sp"
android:inputType="text"
android:gravity="left|top"
android:background="#ffffff"
android:layout_above="#+id/Paste"
android:layout_centerHorizontal="true" />
<!-- SHOULD I PUT ANOTHER ADVIEW IN THIS XML -->
</RelativeLayout>
Here is all my java classes:
MainActivity.java
public class MainActivity extends FragmentActivity {
//View Pager
ViewPager viewpager;
//AdView
AdView adView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewpager = (ViewPager)findViewById(R.id.pager);
PagerAdapter pAdapter = new PagerAdapter(getSupportFragmentManager());
viewpager.setAdapter(pAdapter);
}
public void onClickCopy(View v)
{
//Copy Text From layout_one to Clipboard
}
public void onClickPaste(View v)
{
//Paste Text From Clipboard
}
}
PagerAdapter.java
public class PagerAdapter extends FragmentPagerAdapter {
public PagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int arg0) {
switch (arg0) {
case 0:
return new FragmentOne();
case 1:
return new FragmentTwo();
default:
break;
}
return null;
}
#Override
public int getCount() {
return 2;
}
}
FragmentOne.java
public class FragmentOne extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.layout_one, container, false);
}
}
FragmentTwo.java
public class FragmentTwo extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.layout_two, container, false);
}
}
Where would I put this code so that when they swipe between layout_one and layout_two that the same ad will be displayed and not make a new ad request every time they change views?
//Display test Ads
adView = new AdView(this);
AdRequest request = new AdRequest.Builder()
.addTestDevice("DEVICE_ID").build();
adView.loadAd(request);

The standard pattern for doing this is to put your AdView either above or below your ViewPager and keep it static. That way you are not constantly requesting ads that you never get time to display.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
>
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:id="#+id/pager">
</android.support.v4.view.ViewPager>
<com.google.android.gms.ads.AdView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0"
android:adUnitId="yourAdUnitId"
android:id="#+id/adView">
</LinearLayout>
This way your Adview is outside your ViewPager and remains constant across all pages.

I use the following code to cache Admob in scroll Grid View:
public View getView(int position, View convertView, ViewGroup parent) {
if (position != adNum) {
...
} else {
if (mAdView == null) {
frameLayout = new FrameLayout(mContext);
mAdView = new AdView(mContext);
...
frameLayout.addView(mAdView);
} else {
frameLayout.removeView(mAdView);
frameLayout = new FrameLayout(mContext);
frameLayout.addView(mAdView);
}
return frameLayout;
}
}