I m trying to display nested recyclerview but the child items does not display.
I want to display different items in all child view.
I don't get a error, but the view is not refreshed.
Here is my code can any one help.
Thanks
public class MainActivity extends ActionBarActivity {
RecyclerView recyclerView;
RootAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
adapter = new RootAdapter(this);
recyclerView = (RecyclerView) findViewById(R.id.recyclerRoot);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
}
private class RootAdapter extends RecyclerView.Adapter<RootAdapter.RootViewHolder> {
private final LayoutInflater inflater;
String[] _items = new String[]{"ITEM 1", "ITEM 2", "ITEM 3", "ITEM 4"};
public RootAdapter(Context context)
{
inflater = LayoutInflater.from(context);
}
#Override
public RootViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = inflater.inflate(R.layout.root_row, viewGroup, false);
RootViewHolder rvi = new RootViewHolder(view);
return rvi;
}
#Override
public void onBindViewHolder(RootViewHolder rootViewHolder, int i) {
rootViewHolder.txtRootLine.setText(_items[i]);
rootViewHolder.recyclerViewChild.setLayoutManager(new LinearLayoutManager(inflater.getContext()));
rootViewHolder.recyclerViewChild.setAdapter(new ChildAdapter(inflater));
}
#Override
public int getItemCount() {
return _items.length;
}
class RootViewHolder extends RecyclerView.ViewHolder {
TextView txtRootLine;
RecyclerView recyclerViewChild;
public RootViewHolder(View itemView) {
super(itemView);
txtRootLine = (TextView) itemView.findViewById(R.id.txtRootLine);
recyclerViewChild = (RecyclerView) itemView.findViewById(R.id.recyclerChild);
}
}
}
private class ChildAdapter extends RecyclerView.Adapter<ChildAdapter.ChildViewHolder> {
private LayoutInflater _inflater;
String[] _childItems = new String[]{"child 1", "child 2", "child 2"};
public ChildAdapter(LayoutInflater inflater) {
_inflater = inflater;
}
#Override
public ChildViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = _inflater.inflate(R.layout.child_row, viewGroup, false);
ChildViewHolder rvi = new ChildViewHolder(view);
return rvi;
}
#Override
public void onBindViewHolder(ChildViewHolder childViewHolder, int i) {
childViewHolder.txtChildLine.setText(_childItems[i]);
}
#Override
public int getItemCount() {
return _childItems.length;
}
public class ChildViewHolder extends RecyclerView.ViewHolder {
TextView txtChildLine;
public ChildViewHolder(View itemView) {
super(itemView);
txtChildLine = (TextView) itemView.findViewById(R.id.txtChildLine);
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="main text"/>
<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/recyclerRoot"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
root_row.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">
<TextView
android:id="#+id/txtRootLine"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/recyclerChild"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
child_row.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">
<TextView
android:id="#+id/txtChildLine"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
Existing layout manager does not support wrap content yet.
Test it by assigning a fixed height to your recyclerChild and the view would appear.
As a solution to this problem you can create a new LayoutManager that extends the existing one and overrides onMeasure method to measure for wrap content.
By Android Support Library 23.2 of a support library version 23.2.0. So all WRAP_CONTENT should work correctly.
Please update version of a library in gradle file.
compile 'com.android.support:recyclerview-v7:23.2.0'
RecyclerView does not support wrap_content.Set some value in nested recycler view like 200dp and your item will shows.
More discussion available here
Related
I am trying to show the list in RecyclerView.
but after setting adapter only Adapter constructor getting called after that nothing happens
Below is the code of Adapter
public class ChildNameAdpator extends RecyclerView.Adapter<ChildNameAdpator.ViewHolder> {
List<ChildDatum> arrayList;
public ChildNameAdpator(List<ChildDatum> arrayListChildName) {
arrayList = new ArrayList<>();
arrayList = arrayListChildName;
}
#NonNull
#Override
public ChildNameAdpator.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LinearLayout layoutRowPermissionCount = (LinearLayout) LayoutInflater.from(parent.getContext()).inflate(R.layout.row_child_name_layout, parent, false);
return new ViewHolder(layoutRowPermissionCount);
}
#Override
public void onBindViewHolder(#NonNull ChildNameAdpator.ViewHolder holder, int position) {
holder.mTvChildName.setText(arrayList.get(position).getChildName());
}
#Override
public int getItemCount() {
return arrayList.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
AutoResizeTextView mTvChildName;
LinearLayout mLinearLayoutChild;
AutoResizeTextView imageButtonDeleteChildRow;
ViewHolder(#NonNull View itemView) {
super(itemView);
Log.d(TAG, "ViewHolder: ");
mTvChildName = itemView.findViewById(R.id.tv_row_child_name);
mLinearLayoutChild = itemView.findViewById(R.id.ll_row_child_name);
}
}
}
I am calling this adapter with below code
mRecyclerviewChildName = findViewById(R.id.rv_child_name_parental_control);
mRecyclerviewChildName.setLayoutManager(new LinearLayoutManager(this));
mCurrentChildsList.add(new ChildDatum("11", "ty8902", "3333", "3333", "333", "2222", "2222", "1222"));
mCurrentChildsList.add(new ChildDatum("12", "ty8902", "3333", "3333", "333", "2222", "2222", "1222"));
mCurrentChildsList.add(new ChildDatum("13", "ty8902", "3333", "3333", "333", "2222", "2222", "1222"));
childNameAdpator = new ChildNameAdpator(mCurrentChildsList);
mRecyclerviewChildName.setAdapter(childNameAdpator);
Below is row layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="#+id/tv_row_child_name"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
EDIT: Added Recyclerview's Parent 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"
android:orientation="vertical" >
<androidx.cardview.widget.CardView
android:id="#+id/card_view_display_child_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:layout_marginBottom="16dp"
android:padding="8dp"
android:visibility="gone"
app:cardBackgroundColor="#color/colorPrimaryDark"
app:cardCornerRadius="8dp"
app:cardElevation="8dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rv_child_name_parental_control"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:orientation="vertical">
</androidx.recyclerview.widget.RecyclerView>
<com.lb.auto_fit_textview.AutoResizeTextView
android:id="#+id/ib_add_new_child_name"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_marginStart="4dp"
android:layout_marginLeft="4dp"
android:background="#drawable/ic_add_circle_black_24dp"
android:padding="8dp"
android:textAlignment="center"
android:textColor="#color/colorGreyLight"
android:textStyle="bold"
android:visibility="gone" />
</LinearLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
After setAdapter only constructor getting called nothing else that's it.
I thought it is due to my Gradle issue and tried on another laptop, the same issue occurred there.
Looking for help
Thanks in advance.
Change Adapter Constructor and try this
public ChildNameAdpator(List<ChildDatum> arrayListChildName) {
arrayList = new ArrayList<>();
arrayList.addAll(arrayList);
}
or
public ChildNameAdpator(List<ChildDatum> arrayListChildName) {
this.arrayList = arrayListChildName;
}
Try this way:
rView=findViewById(R.id.rView);
rView.setHasFixedSize(true);
lManager=new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);
rView.setLayoutManager(lManager);
Make sure the following things you have done:
Declared your adapter class as public
Initialised
'mCurrentChildsList' before adding items.
Initialise: mCurrentChildsList = new ArrayList()
You have skipped the LayoutManager.
A LayoutManager is responsible for measuring and positioning item views within a RecyclerView as well as determining the policy for when to recycle item views that are no longer visible to the user.
Set the LayoutManager once you initialized the recycler view.
mRecyclerviewChildName.setLayoutManager(new LinearLayoutManager(this));
Reference : LayoutManager
Adapter Code:
public class ChildNameAdpator extends RecyclerView.Adapter<ChildNameAdpator.ViewHolder> {
private List<ChildDatum> arrayList;
public ChildNameAdpator(List<ChildDatum> arrayListChildName) {
arrayList = arrayListChildName;
}
}
This how your adapter class looks like.
Main Activity.
public class DemoTestActivity extends AppCompatActivity {
RecyclerView mRecyclerviewChildName;
ChildNameAdpator childNameAdpator;
List<ChildDatum> mCurrentChildsList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_demo_test);
mCurrentChildsList = new ArrayList<>();
mRecyclerviewChildName=(RecyclerView)findViewById(R.id.rv_child_name_parental_control);
mCurrentChildsList.add(new ChildDatum("Mehul"));
mCurrentChildsList.add(new ChildDatum("Mehul 1"));
mCurrentChildsList.add(new ChildDatum("Mehul 2"));
childNameAdpator = new ChildNameAdpator(mCurrentChildsList);
mRecyclerviewChildName.setLayoutManager(new LinearLayoutManager(DemoTestActivity.this, LinearLayoutManager.VERTICAL, false));
mRecyclerviewChildName.addItemDecoration(new DividerItemDecoration(mRecyclerviewChildName.getContext(), DividerItemDecoration.VERTICAL));
mRecyclerviewChildName.setAdapter(childNameAdpator);
}}
Main Layout file
<?xml version="1.0" encoding="utf-8"?>
<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=".DemoTestActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rv_child_name_parental_control"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:orientation="vertical">
</androidx.recyclerview.widget.RecyclerView>
</RelativeLayout>
Adapter
public class ChildNameAdpator extends
RecyclerView.Adapter<ChildNameAdpator.ViewHolder> {
List<ChildDatum> arrayList;
public ChildNameAdpator(List<ChildDatum> arrayListChildName) {
arrayList = new ArrayList<>();
arrayList = arrayListChildName;
}
#NonNull
#Override
public ChildNameAdpator.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LinearLayout layoutRowPermissionCount = (LinearLayout) LayoutInflater.from(parent.getContext()).inflate(R.layout.row_child_name_layout, parent, false);
return new ViewHolder(layoutRowPermissionCount);
}
#Override
public void onBindViewHolder(#NonNull ChildNameAdpator.ViewHolder holder, int position) {
holder.mTvChildName.setText(arrayList.get(position).getChildName());
}
#Override
public int getItemCount() {
return arrayList.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
TextView mTvChildName;
ViewHolder(#NonNull View itemView) {
super(itemView);
mTvChildName = itemView.findViewById(R.id.tv_row_child_name);
}
}}
Model class
public class ChildDatum {
String ChildName;
public ChildDatum(String sChildName) {
this.ChildName = sChildName;
}
public String getChildName() {
return ChildName;
}
public void setChildName(String childName) {
ChildName = childName;
}}
Finally, I got my mistake.
android:visibility="gone"
VISIBILITY of parent Cardview was GONE due to this onBindViewHolder was not getting called.
When I changed the visibility to VISIBLE it Worked.
Thank you all for your efforts.
I'm developing a screen for an android app where I need to add a click event to each row of recyclerview and it's working in parts.
The problem is that once the intent is loaded the clickable area is limited to the width of its the contents.
the clickable area works fine (at 100% width) only if the recyclerview row is completely hidden from the viewport after a scroll happen.
Bellow has a gif that illustrates my problem. Note that before scroll the clickable area is reduced to row content and after scroll the clickable area fills the row.
<img src="https://i.imgur.com/wGvqa5Z.gif" width="150" style="width:150px; border:1px solid #000;" />
active_catalog.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.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="viniciusdesouza.com.br.barbearia.CatalogActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_catalog"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark" />
</android.support.design.widget.AppBarLayout>
<include layout="#layout/content_catalog" />
</android.support.design.widget.CoordinatorLayout>
content_catalog.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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context="viniciusdesouza.com.br.barbearia.CatalogActivity"
tools:showIn="#layout/activity_catalog">
<android.support.v7.widget.RecyclerView
android:id="#+id/rv_catalog_list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.constraint.ConstraintLayout>
catalog_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="72sp"
android:gravity="center_vertical"
android:orientation="vertical"
android:background="?android:attr/selectableItemBackground">
<TextView
android:id="#+id/txt_catalog_item_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fontFamily="sans-serif"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:text="TextView"
android:textSize="16sp"
android:textStyle="bold" />
<TextView
android:id="#+id/txt_catalog_item_price"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:text="TextView" />
</LinearLayout>
CatalogAdapter.java
public class CatalogAdapter extends RecyclerView.Adapter<CatalogAdapter.ViewHolderCatalog> {
private List<CatalogItem> catalog;
private OnRecyclerViewItemClickListener listener;
public CatalogAdapter (List<CatalogItem> catalog) {
this.catalog = catalog;
}
#Override
public CatalogAdapter.ViewHolderCatalog onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View view = layoutInflater.inflate(R.layout.catalog_item, parent, false);
ViewHolderCatalog viewHolderCatalog = new ViewHolderCatalog(view);
return viewHolderCatalog;
}
#Override
public void onBindViewHolder(CatalogAdapter.ViewHolderCatalog holder, final int position) {
if ( (catalog != null) && (catalog.size() > 0)) {
CatalogItem item = catalog.get(position);
holder.txtItemName.setText(item.name);
holder.txtItemPrice.setText(String.valueOf(item.price));
holder.itemView.setOnClickListener(new View.OnClickListener () {
#Override
public void onClick(View v){
listener.onRecyclerViewItemClicked(position, -1);
}
});
}
}
#Override
public int getItemCount() {
return catalog.size();
}
public static class ViewHolderCatalog extends RecyclerView.ViewHolder {
public TextView txtItemName;
public TextView txtItemPrice;
public ViewHolderCatalog(View itemView) {
super(itemView);
txtItemName = (TextView) itemView.findViewById(R.id.txt_catalog_item_name);
txtItemPrice = (TextView) itemView.findViewById(R.id.txt_catalog_item_price);
}
}
/**
* Custom created method for Setting the item click listener for the items and items with in items
* #param listener OnRecyclerViewItemClickListener
*/
public void setOnItemClickListener(OnRecyclerViewItemClickListener listener)
{
this.listener = listener;
}
}
CatalogActivity.java
public class CatalogActivity extends AppCompatActivity implements OnRecyclerViewItemClickListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_catalog);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar_catalog);
setSupportActionBar(toolbar);
// back button
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
recyclerViewCatalog = (RecyclerView) findViewById(R.id.rv_catalog_list);
recyclerViewCatalog.setHasFixedSize(true);
dbConnect();
catalogRepository = new CatalogRepository(databaseHandler);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
catalog = catalogRepository.all();
recyclerViewCatalog.setLayoutManager(linearLayoutManager);
catalogAdapter = new CatalogAdapter(catalog);
mDividerItemDecoration = new DividerItemDecoration(
recyclerViewCatalog.getContext(),
linearLayoutManager.getOrientation()
);
recyclerViewCatalog.addItemDecoration(mDividerItemDecoration);
recyclerViewCatalog.setAdapter(catalogAdapter);
catalogAdapter.setOnItemClickListener(this);
}
#Override
public void onRecyclerViewItemClicked(int position, int id)
{
// do something with item clicked
}
}
Any help will be appreciated
The issue has to do with your ConstraintLayout in your content_catalog.xml file.
A similar issue is happening here, so to fix it, try simply replacing it with something else like a LinearLayout or RelativeLayout and it should resolve the issue of the view not expanding until after scrolling re-renders it.
Just change your ViewHolderCatalog class like below
public static class ViewHolderCatalog extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView txtItemName;
public TextView txtItemPrice;
public ViewHolderCatalog(View itemView) {
super(itemView);
txtItemName = (TextView) itemView.findViewById(R.id.txt_catalog_item_name);
txtItemPrice = (TextView) itemView.findViewById(R.id.txt_catalog_item_price);
itemView.setOnClickListener(this);
}
#Override
public void onClick(View v) {
Toast.makeText(v.getContext(), “You clicked your your recycler view item”, Toast.LENGTH_SHORT).show();
}
}
I am using fragment and recyclerview together. I also have database and I want to query results coming from the database and display the results inside the activity.
However every time I try to run the application and switch to the part to get and view the results, I don't seem to get anything. No results at all just blank. I don't know why it's not showing up.
This is my full code
Sample class
public class Sample extends Fragment {
private View rootView;
public Sample() {}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
rootView = inflater.inflate(sample, container, false);
RecyclerView mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerView_sample);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
mRecyclerView.setHasFixedSize(true);
DatabaseHandler db= new DatabaseHandler(getActivity());
List<SampleModel> list = db.getResults();
SampleAdapter sampleAdapter = new SampleAdapter(list);
mRecyclerView.setAdapter(sampleAdapter);
return rootView;
}
}
Adapter Class
public class SampleAdapter extends RecyclerView.Adapter <SampleAdapter.ViewHolder> {
private List<SampleModel> list;
private Context mContext;
public SampleAdapter (List<SampleModel> list) {
list = list;
}
#Override
public SampleAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.sample_item, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(SampleAdapter.ViewHolder holder, int position) {
SampleModel sample = list.get(holder.getAdapterPosition());
holder.title.setText(sample.getTitle())
}
#Override
public int getItemCount() {
return (list != null? list.size():0);
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView title;
public ViewHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.title);
}
}
}
XML
sample.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
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:fitsSystemWindows="true">
<include layout="#layout/sample_recyclerview" />
</android.support.design.widget.CoordinatorLayout>
sample_recyclerview.xml
<?xml version="1.0" encoding="utf-8"?>
<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"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView_sample"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clipToPadding="false"/>
</RelativeLayout>
sample_item.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/cardview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:layout_marginLeft="16dp"
android:layout_marginRight="16dp"
android:focusable="true"
android:clickable="true"
android:foreground="?android:attr/selectableItemBackground"
card_view:cardBackgroundColor="#808080">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="16dp">
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#ffffff" />
</LinearLayout>
</android.support.v7.widget.CardView>
In your SampleAdapter change
list = list;
to
this.list = list;
Your Adapter constructor is wrong. You are not passing the dataSource to your adapter. Change it to
public SampleAdapter (List<SampleModel> list) {
this.list = list;
}
Furthermore you have to notify the adapter that you changed your dataSource. You do that by calling the method notifyDataSetChanged
SampleAdapter sampleAdapter = new SampleAdapter(list);
mRecyclerView.setAdapter(sampleAdapter);
sampleAdapter.notifyDataSetChanged();
RecyclerViews will return nothing if the size is not rightly returned(e.g using : return 0;)
change your code from :
public int getItemCount() {
return (list != null? list.size():0);
To:
public int getItemCount() {
return list.size();
I am using RecylerView to set RadioButton.But on selection selected changes its position when scroll.Please help me.
Thanx in advance!!!
My RecylerView Layout
<?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="wrap_content">
<android.support.v7.widget.RecyclerView
android:id="#+id/dummy_recycle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
My RadioButton Layout
<?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="wrap_content">
<LinearLayout
android:layout_width="wrap_content"
android:orientation="vertical"
android:layout_height="wrap_content">
<RadioButton
android:id="#+id/radio_dummy"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</RelativeLayout>
My RecylerView Java File
public class Dummy extends AppCompatActivity {
ArrayList<String> arr_qty;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dummy);
arr_qty=new ArrayList<>();
for(int i =0;i<50;i++){
arr_qty.add(String.valueOf(i));
}
RecyclerView dummy = (RecyclerView)findViewById(R.id.dummy_recycle);
DummyAdapter adapter = new DummyAdapter(getApplicationContext(), arr_qty);
dummy.setLayoutManager(new LinearLayoutManager(getApplicationContext(), LinearLayoutManager.VERTICAL, false));
dummy.setAdapter(adapter);
}
}
My RecylerView Adapter
public class DummyAdapter extends RecyclerView.Adapter<DummyAdapter.MyViewHolder>{
private Context c;
ArrayList<String> arr=new ArrayList<>();
public DummyAdapter(Context context, ArrayList<String> arr_qty) {
this.arr = arr_qty;
this.c = context;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.dummy_value, parent, false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
}
#Override
public int getItemCount() {
return arr.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
public RadioButton radio;
public MyViewHolder(View itemView) {
super(itemView);
radio = (RadioButton) itemView.findViewById(R.id.radio_dummy);
}
}
}
In Recycleview adapter you can add the below the line. It's already working in my code. This code helps to fix your list position.
public int getItemViewType(int position) {
return position;
}
I want to show a list of records using RecyclerView.
But when i run the application, it shows just one record.
I verified my code, and everything seems fine.
Adapter Code:
public class AdapterData extends RecyclerView.Adapter<AdapterData.DummyHolder> {
private LayoutInflater layoutInflater;
private ArrayList<String> mItems = new ArrayList<>();
public Context ThisContext;
public AdapterData(Context context)
{
layoutInflater = LayoutInflater.from(context);
mItems = generateValues();
ThisContext = context;
}
public static ArrayList<String> generateValues(){
ArrayList<String> Dummy = new ArrayList<>();
for(int i=1; i<100; i++)
{
Dummy.add("Item"+i);
Log.d("MTS", String.valueOf(i));
}
return Dummy;
}
#Override
public DummyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view= layoutInflater.inflate(R.layout.row_layout,parent,false);
DummyHolder holder=new DummyHolder(view);
return holder;
}
#Override
public void onBindViewHolder(DummyHolder holder, int position) {
holder.txt_name.setText(mItems.get(position));
Log.d("MAN=",mItems.get(position));
}
#Override
public int getItemCount() {
return 100;
}
public static class DummyHolder extends RecyclerView.ViewHolder{
TextView txt_name;
public DummyHolder(View itemView) {
super(itemView);
txt_name = (TextView) itemView.findViewById(R.id.tx_name);
}
}
}
Row Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/tx_name"
android:hint="Hello"/>
</LinearLayout>
Main Actiivity XML :
<?xml version="1.0" encoding="utf-8"?>
<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:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="com.hogwarts.harrypotter.recyclerdemo.MainActivity">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/rv_list">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
MainActivity Code:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.rv_list);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setAdapter(new AdapterData(this));
}
Take a look at item layout. Root layout has android:layout_height="match_parent".
It mean item take full screen height. Change to wrap_content and let party. Say oh yeah