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'RecyclerView: No adapter attached; skipping layout' error when nesting RecyclerView alongside EditText inside parent layout

I have a RecyclerView which correctly displays data gotten from an RSS feed when it is the sole object within the XML file, i.e. it is not nested in a parent or sharing a parent within another element. Conversely, when I try to do just that, the data does not display, and I instead receive the error 'RecyclerView: No adapter attached; skipping layout' in LogCat. I should mention that this RecyclerView is generated as part of a ListFragment.
The Fragment replaces a FrameLayout in ActivityMain.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout
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:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:background="#color/design_default_color_primary"
android:elevation="4dp"
android:theme="#style/ThemeOverlay.AppCompat.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:titleTextColor="#ffff"/>
<!-- This one -->
<FrameLayout
android:id="#+id/main_fragment_target"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
<com.google.android.material.navigation.NavigationView
android:id= "#+id/nav_view"
android:layout_width= "wrap_content"
android:layout_height= "match_parent"
android:layout_gravity= "start"
android:fitsSystemWindows= "true"
app:menu= "#menu/activity_main_drawer" />
</androidx.drawerlayout.widget.DrawerLayout>
Which is performed by the following code in MainActivity.java
MainActivity.this.runOnUiThread(() -> {
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
ComponentListFragment componentListFragment = new ComponentListFragment(componentsList);
transaction.replace(R.id.main_fragment_target, componentListFragment);
transaction.commit();
});
As mentioned, the data loads just fine when I'm not messing with the RecycleView XML file, so I am doubtful that inserting the fragment is the problem. I'm just posting this for posterity.
So, MainActivity.java replaces the fragment with an instance of ComponentListFragment.java:
package com.example.mclean_ross_s2030507;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
/**
* A fragment representing a list of Items.
*/
public class ComponentListFragment extends Fragment {
// TODO: Customize parameter argument names
private static final String ARG_COLUMN_COUNT = "column-count";
// TODO: Customize parameters
private int mColumnCount = 1;
private ArrayList<ListComponent> components;
/**
* Mandatory empty constructor for the fragment manager to instantiate the
* fragment (e.g. upon screen orientation changes).
*/
public ComponentListFragment() {
}
public ComponentListFragment(ArrayList<ListComponent> components) {
this.components = components;
}
// TODO: Customize parameter initialization
#SuppressWarnings("unused")
public static ComponentListFragment newInstance(int columnCount) {
ComponentListFragment fragment = new ComponentListFragment();
Bundle args = new Bundle();
args.putInt(ARG_COLUMN_COUNT, columnCount);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mColumnCount = getArguments().getInt(ARG_COLUMN_COUNT);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_component_list_list, container, false);
// Set the adapter
if (view instanceof RecyclerView) {
Context context = view.getContext();
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
RecyclerView recyclerView = (RecyclerView) view;
recyclerView.setHasFixedSize(true);
recyclerView.addItemDecoration(
new DividerItemDecoration(recyclerView.getContext(),
linearLayoutManager.getOrientation())
);
if (mColumnCount <= 1) {
recyclerView.setLayoutManager(linearLayoutManager);
} else {
recyclerView.setLayoutManager(new GridLayoutManager(context, mColumnCount));
}
recyclerView.setAdapter(new MyItemRecyclerViewAdapter(components));
}
return view;
}
}
Which builds a RecyclerView and sets the adapter to MyItemRecyclerViewAdapter.java:
package com.example.mclean_ross_s2030507;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.recyclerview.widget.RecyclerView;
import com.example.mclean_ross_s2030507.databinding.FragmentComponentListBinding;
import com.example.mclean_ross_s2030507.placeholder.PlaceholderContent.PlaceholderItem;
import java.util.ArrayList;
/**
* {#link RecyclerView.Adapter} that can display a {#link PlaceholderItem}.
* TODO: Replace the implementation with code for your data type.
*/
public class MyItemRecyclerViewAdapter extends RecyclerView.Adapter<MyItemRecyclerViewAdapter.ViewHolder> {
private final ArrayList<ListComponent> mValues;
public MyItemRecyclerViewAdapter(ArrayList<ListComponent> items) {
mValues = items;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new ViewHolder(FragmentComponentListBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false));
}
#Override
public void onBindViewHolder(final ViewHolder holder, int position) {
Log.e("MyTag", String.valueOf(holder));
holder.mItem = mValues.get(position);
// holder.mIdView.setText(mValues.get(position).id);
holder.mContentView.setText(mValues.get(position).getTitle());
holder.itemView.setOnClickListener(view -> {
});
}
#Override
public int getItemCount() {
return mValues.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
// public final TextView mIdView;
public final TextView mContentView;
public ListComponent mItem;
public ViewHolder(FragmentComponentListBinding binding) {
super(binding.getRoot());
// mIdView = binding.itemNumber;
mContentView = binding.content;
}
#Override
public String toString() {
return super.toString() + " '" + mContentView.getText() + "'";
}
}
}
Finally, this is the view (fragment_component_list_list.xml) I am trying to achieve, but which is causing the error:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
tools:context=".MainActivity">
<EditText
android:id="#+id/edittext"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<androidx.recyclerview.widget.RecyclerView
tools:viewBindingType="androidx.recyclerview.widget.RecyclerView"
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:id="#+id/list"
android:name="com.example.mclean_ross_s2030507.ComponentListFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="0dp"
android:layout_marginRight="0dp"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
tools:context=".ComponentListFragment"
tools:listitem="#layout/fragment_component_list"
android:scrollbars="vertical"/>
</LinearLayout>
However, the same file with the following setup works just fine:
<androidx.recyclerview.widget.RecyclerView
tools:viewBindingType="androidx.recyclerview.widget.RecyclerView"
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:id="#+id/list"
android:name="com.example.mclean_ross_s2030507.ComponentListFragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="0dp"
android:layout_marginRight="0dp"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
tools:context=".ComponentListFragment"
tools:listitem="#layout/fragment_component_list"
android:scrollbars="vertical"/>
Nested:
Not nested:
I'm aware that various solutions to this error are all over SO, but I'm yet to see any specifically answering my issue regarding the nesting of RecyclerView. As always, any help is much appreciated. Cheers.

The view being inflated in onCreateView of ComponentListFragment is not a RecyclerView but a LinearLayout, based on the contents of R.layout.fragment_component_list_list you provided. The parent View/ViewGroup is always returned from inflate. So you need to reference the actual RecyclerView inside of that layout:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_component_list_list, container, false);
RecyclerView rv = (RecyclerView) view.findViewById(R.id.list)
// No need for if statement, just use `rv` variable...
...
Also, your XML has a few mistakes and areas for improvement:
Remove the redundant namespace (xmlns) attributes in the RecyclerView element and move xmlns:app to the root element.
The android:name attribute is only used in the <application> element of the AndroidManifest.xml
You don't need the tools:viewBindingType attribute. It's only needed to disambiguate generated views when using View Binding Type
tools:context is only meant for the root view. See tools attributes
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<EditText
android:id="#+id/edittext"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="0dp"
android:layout_marginRight="0dp"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
tools:listitem="#layout/fragment_component_list"
android:scrollbars="vertical"/>
</LinearLayout>

ViewPager2 Inside bottom sheet prevents bottom sheet from vertically scrolling

I have a a persistent bottom sheet behavior in my main activity. The bottom sheet has a container for a fragment with a ViewPager2. The problem is that the ViewPager2 prevents the bottom sheet from vertically scrolling.
I recreated the issue in the a sample app. As you can see from this gif right here, the vertical scrolling doesn't work if it's inside the ViewPager2. Only when I drag all the way down outside the ViewPager2, does it start ducking the bottom sheet. This makes scrolling awkward.
I tried the solution described here but it didn't change anything. The activity's root view is a CoordinatorLayout and the fragment's root view is a LinearLayout with a ConstraintLayout around the ViewPager2.
Here's the main activity layout:
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_gravity="center">
<Button
android:id="#+id/expand_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Expand Bottom Sheet" />
</LinearLayout>
<FrameLayout
android:id="#+id/bottom_sheet"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">
<FrameLayout
android:id="#+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true" />
</FrameLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
Here's the fragment inside the bottom sheet's layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/purple_500">
<TextView
android:id="#+id/sheet_textview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="10dp"
android:gravity="center_horizontal"
android:text="This is the sheet fragment"
android:textSize="24sp"
android:textAlignment="center"
android:textColor="#color/white" />
<androidx.viewpager2.widget.ViewPager2
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="325dp"
android:layout_marginTop="75dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:gravity="center_horizontal"
android:text="Outside viewpager"
android:textSize="24sp"
android:textAlignment="center"
android:textColor="#color/white"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="parent"
app:layout_constraintTop_toBottomOf="#id/view_pager"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
</LinearLayout>
Here's the MainActivity:
package com.example.myapplication;
import android.os.Bundle;
import android.widget.Button;
import android.widget.FrameLayout;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import com.google.android.material.bottomsheet.BottomSheetBehavior;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BottomSheetBehavior<FrameLayout> bottomSheetBehavior = BottomSheetBehavior.from(findViewById(R.id.bottom_sheet));
bottomSheetBehavior.setPeekHeight(200);
bottomSheetBehavior.setHideable(true);
bottomSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
Button expandButton = findViewById(R.id.expand_button);
expandButton.setOnClickListener(view -> bottomSheetBehavior.setState(BottomSheetBehavior.STATE_EXPANDED));
Fragment sheetFragment = new SheetFragment();
getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, sheetFragment).commit();
}
}
And here's the SheetFragment:
package com.example.myapplication;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.RecyclerView;
import androidx.viewpager2.widget.ViewPager2;
public class SheetFragment extends Fragment {
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View contentView = inflater.inflate(R.layout.fragment_sheet, container, false);
ViewPager2 viewPager = contentView.findViewById(R.id.view_pager);
ViewPagerAdapter adapter = new ViewPagerAdapter();
viewPager.setAdapter(adapter);
return contentView;
}
public class ViewPagerAdapter extends RecyclerView.Adapter<ViewPagerHolder> {
#NonNull
#Override
public ViewPagerHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View itemView = getLayoutInflater().inflate(R.layout.pager_item, parent, false);
return new ViewPagerHolder(itemView);
}
#Override
public void onBindViewHolder(#NonNull ViewPagerHolder holder, int position) {
holder.bind(position);
}
#Override
public int getItemCount() {
return 5;
}
}
private class ViewPagerHolder extends RecyclerView.ViewHolder {
public ViewPagerHolder(#NonNull View itemView) {
super(itemView);
}
public void bind(int number) {
TextView textView = itemView.findViewById(R.id.pager_textview);
textView.setText(String.format("Inside ViewPager\nPage #%d", number));
}
}
}

Thanks to the great bobekos for helping me with this. His answer was:
Thats because the bottomsheet allow only one scrollable view. So to make it work you must disable the nestedscrolling of the viewpager. The problem is you must
get access to the recylerview inside the viewpager2 there is currently
no get method and the class is final so you can't use inheritance. But
you can do this:
//as extension function
fun ViewPager2.disableNestedScrolling() {
(getChildAt(0) as? RecyclerView)?.apply {
isNestedScrollingEnabled = false
overScrollMode = View.OVER_SCROLL_NEVER
}
}
ps.not tested directly
I translated it to Java:
RecyclerView innerRecyclerView = (RecyclerView) viewPager2.getChildAt(0);
if (innerRecyclerView != null) {
innerRecyclerView.setNestedScrollingEnabled(false);
innerRecyclerView.setOverScrollMode(View.OVER_SCROLL_NEVER);
}
Tested and works perfectly.

NestedScrollView works only in first item of ViewPager, not working for other items

I have a view pager with 2 views, in each view, I have a NestedScrollView which is parenting an EditText.
The first view/item in view pager scroll smoothly as I expect, but another one freezes as the way if I have never added NestedScrollView! So NestedScrollView only works for the first item.
Item :
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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">
<androidx.core.widget.NestedScrollView
android:layout_width="0dp"
android:layout_height="0dp"
android:fillViewport="true"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<EditText
android:id="#+id/edt_pager_leitner_info"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#android:color/transparent"
android:enabled="false"
android:inputType="textMultiLine"
android:textColor="#color/darkGrey" />
</androidx.core.widget.NestedScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>
View pager adapter :
package com.yasinhajilou.dileit.view.adapter.viewpager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.viewpager.widget.PagerAdapter;
import com.yasinhajilou.dileit.R;
import java.util.ArrayList;
import java.util.List;
public class AddNewLeitnerViewPagerAdapter extends PagerAdapter {
List<String> titles = new ArrayList<>();
List<String> mInformation = new ArrayList<>();
#Override
public int getCount() {
return titles.size();
}
#NonNull
#Override
public Object instantiateItem(#NonNull ViewGroup container, int position) {
View view = LayoutInflater.from(container.getContext()).inflate(R.layout.item_pager_leitner_info, container, false);
view.setTag(titles.get(position));
TextView textView = view.findViewById(R.id.edt_pager_leitner_info);
textView.setText(mInformation.get(position));
container.addView(view);
return view;
}
#Override
public boolean isViewFromObject(#NonNull View view, #NonNull Object object) {
return view == object;
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
if (titles.size() > 0)
return titles.get(position);
else return null;
}
public void addData(String title, String info) {
titles.add(title);
mInformation.add(info);
notifyDataSetChanged();
}
}

Why do my Custom GridView show only one column?

I'v tried making a Custom GridView that adds proggramatically TextView items.
The TextViews needs to act as an ImageView only that it has a text within it.
But for some odd reason it shows me only 1 column out of 4 (but if its too big then 3 is my minimum capcity).
I look through similar cases for people who attempted the same thing, but all the same as it ended failing.
All I get is a one column Gridview each time.
I'd like to hear some opinions about it, in fix this issue.
My GridView:
<GridView
android:id="#+id/gridView"
android:layout_width="300dp"
android:layout_height="300dp"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:layout_marginTop="73dp"
android:layout_toEndOf="#+id/imageView15"
android:columnCount="4"
android:gravity="center"
android:columnWidth="100dp"
android:stretchMode="columnWidth" />
My item layout:
<LinearLayout 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:backgroundTint="#android:color/black"
android:alpha="100"
android:layoutDirection="ltr">
<TextView
android:id="#+id/item"
android:layout_width="150px"
android:layout_height="150px"
android:layout_marginRight="50px"
android:textColor="#android:color/black"
android:textSize="10sp" />
</LinearLayout>
And finally the Adapter:
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.List;
public class CustomListAdapter extends BaseAdapter {
private Activity context;
private List<TextView> items;
private static LayoutInflater inflater;
public CustomListAdapter(Activity context, List<TextView> items) {
this.context = context;
this.items = items;
inflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return items.size();
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
public class Holder {
TextView tv;
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
inflater = context.getLayoutInflater();
View rowView = inflater.inflate(R.layout.inventory_item, null);
Holder holder = new Holder();
holder.tv = (TextView) rowView.findViewById(R.id.item);
holder.tv.setText(items.get(position).getText());
holder.tv.setBackground(items.get(position).getBackground());
holder.tv.setTextColor(items.get(position).getTextColors());
return rowView;
}
}
Thanks in advance.

shows me only 1 column out of 4
you need to use: android:numColumns="4"
in your code:
<GridView
android:id="#+id/gridView"
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:background="#color/color_white"
android:columnWidth="100dp"
android:gravity="center"
android:horizontalSpacing="5dp"
android:numColumns="4"
android:padding="5dp"
android:scrollbars="none|horizontal"
android:stretchMode="columnWidth"></GridView>

Display Data in GridView with DataAdapter in Android

I have try the following code for displaying data from data adapter in gridview.
Following link is for GridView with DataAdapter Tutorial.
I am wanted the following output :
I have follow the tutorial and get the output as i wanted, but unfortunetly when scroll the page,
application will be closed automatically.
ERROR : "Application Failure Detected, Please Try Again"
How to resolve these problem?
code : main.xml file.
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/gridview"
android:stretchMode="columnWidth"
android:cacheColorHint="#00000000"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="2"
android:clipChildren="true"
android:horizontalSpacing="5dip"
android:verticalSpacing="5dip" />
code : MainActivity.java file.
package com.example.gridviewdata;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.widget.GridView;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(new DataAdapter(this));
}
code : customgrid.xml file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TableLayout android:id="#+id/TableLayout01"
android:layout_height="wrap_content"
android:layout_width="fill_parent">
<TableRow android:id="#+id/TableRow01"
android:layout_height="wrap_content"
android:layout_width="wrap_content">
<TextView android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/txtId"
android:layout_gravity="center_horizontal" />
<TextView android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/txtName"
android:layout_gravity="center_horizontal" />
</TableRow>
</TableLayout>
</LinearLayout>
code : DataAdapter.java file
package com.example.gridviewdata;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class DataAdapter extends BaseAdapter {
Context mContext;
private String [] id = {"S001","S002","S003","S004","S005","S006","S007","S008","S009","S010","S011","S012"};
private String [] name={"Rohit","Rahul","Ravi","Amit","Arun","Anil","Kashif","Nayan","Jay","Sagar","Jairaj","Vishal"};
private LayoutInflater mInflater;
public DataAdapter(Context c)
{
mContext=c;
mInflater = LayoutInflater.from(c);
}
public int getCount()
{
return id.length;
}
public Object getItem(int position)
{
return position;
}
public long getItemId(int position)
{
return position;
}
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder=null;
if(convertView==null)
{
convertView = mInflater.inflate(R.layout.customgrid,parent,false);
holder = new ViewHolder();
holder.txtId=(TextView)convertView.findViewById(R.id.txtId);
holder.txtId.setPadding(100, 10,10 , 10);
holder.txtName=(TextView)convertView.findViewById(R.id.txtName);
holder.txtName.setPadding(100, 10, 10, 10);
if(position==0)
{
convertView.setTag(holder);
}
}
else
{
holder = (ViewHolder) convertView.getTag();
}
holder.txtId.setText(id[position]);
holder.txtName.setText(name[position]);
return convertView;
}
static class ViewHolder
{
TextView txtId;
TextView txtName;
}
}
Give any solution for these problem.
if any other resource is available then give me an reference.

Solution :
In getView() method return all items, and i have setting the tag just in the first item,
when android calls again getView for position 1, i am try to get the tag from convertView,
but i didn't called setTag for convertView 1, then getTag returns a null object, and i am try to get the object txtName from a null object, and then the error occurs.
removing the if(position==0) then application work perfectly and give the scrolling.