Develop Reference

Ripple Effect in Android Recycler View is not working

I'm trying to add a ripple effect for the entire row (like we see in listview) in my Recycler View when the row is clicked.
I have tried
android:background="?android:attr/selectableItemBackground"
android:clickable="true"
android:focusable="true"
But still, I couldn't get the desired behavior. Even I have tried
android:foreground="?android:attr/selectableItemBackground"
But still no improvement
My listrow.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:orientation="horizontal"
android:background="?android:attr/selectableItemBackground"
android:clickable="true"
android:focusable="true">
<RadioButton
android:id="#+id/radioButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/heading"
android:text="Title"
android:textSize="20dp"
android:paddingTop="5dp"
android:textStyle="bold"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:layout_toLeftOf="#+id/subHeading"
android:id="#+id/size"
android:text="Sub Title"
android:paddingTop="3dp"
android:paddingLeft="5dp"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
And My layout with Recycler View
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="wrap_content"
android:layout_width="match_parent">
<androidx.recyclerview.widget.RecyclerView
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clipToPadding="false"
android:paddingTop="#dimen/list_item_spacing_half"
android:paddingBottom="#dimen/list_item_spacing_half"
android:layout_alignParentTop="true"
tools:context=".ListFragment"
tools:listitem="#layout/listrow" />
<Button
android:id="#+id/Save"
android:layout_width="match_parent"
android:text="Save"
android:layout_below="#+id/list"
android:textAllCaps="false"
android:layout_height="wrap_content"/>
</RelativeLayout>
Here is my adapter source code
private class listAdapter extends RecyclerView.Adapter<ViewHolder> {
private final int mItemCount;
final ArrayList<String> mTitles;
final ArrayList<String> msTitles;
ArrayList<RadioButton> radioButtons=new ArrayList<>();
listAdapter(int itemCount, ArrayList<String> titles, ArrayList<String> sTitles) {
mItemCount = itemCount;
mtitles=titles;
msTitles=sTitles;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
return new ViewHolder(LayoutInflater.from(parent.getContext()), parent);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.sTitle.setTag(position);
holder.radioButton.setTag(position);
holder.title.setTag(position);
holder.title.setText(mTitles.get(position));
holder.sTitle.setText(msTitles.get(position));
View.OnClickListener listener = new View.OnClickListener() {
#Override
public void onClick(View v) {
ItemCheckChanged(v);
}
};
holder.radioButton.setOnClickListener(listener);
holder.sTitle.setOnClickListener(listener);
holder.title.setOnClickListener(listener);
if(radioButtons.size()==0){
holder.radioButton.setChecked(true);
selectedItem=0;
}
radioButtons.add(holder.radioButton);
}
#Override
public int getItemCount() {
return mItemCount;
}
void ItemCheckChanged(View v){
selectedItem=(int)v.getTag();
for(RadioButton radioButton:radioButtons){
radioButton.setChecked(false);
}
radioButtons.get(selectedItem).setChecked(true);
notifyDataSetChanged();
}
public int getSelectedIndex(){
return selectedItem;
}
}
NOTE: I'm using these all things in BottomSheetDialog may it be reason?

You should set background to views that have set a click listener.
If you want to set the listener to the whole row you need to call only:
holder.itemView.setOnclickListener() and remove rest of them.

Two RecyclerView inside the same Scrollview, one does not show content

I'm facing a problem with two RecyclerView inside the same ScrollView (I also tried the same with a NestestScrollView). Inside the ScrollView, I have also some other View objects that form a kind of "header section" of the fragment. Then, I would like to show a horizontal list of RecyclerView, and finally, above the horizontal list, a vertical list of other RecyclerView. However, only the horizontal one is correctly visualized. Even though the Adapter of the vertical one is correctly initialized with some objects, when I run the application, the vertical list is empty. I think it is a problem related to my layout.
This is my .xml file:
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
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:id="#+id/profile_coordinator"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".HomeFragment">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="20dp">
<!-- Here I have some other views (ImageView, TextView, etc.) -->
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/active_promos"
android:textStyle="bold"
android:textColor="#color/colorPrimary"
android:textSize="18sp"
android:layout_marginBottom="10sp"/>
<!-- Horizontal List of RecyclerView -->
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/promo_recyclerview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
android:layout_marginBottom="20sp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/news"
android:textStyle="bold"
android:textColor="#color/colorPrimary"
android:textSize="18sp"
android:layout_marginBottom="10sp"/>
<!-- Vertical List of RecyclerView -->
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/news_recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</LinearLayout>
</ScrollView>
Since the objects to show are the same (but the semantics is different), I'm using the same Adapter class that loads two different xml layout according to the type of object to show.
This is the Adapter.java:
public class NewsAdapter extends RecyclerView.Adapter {
private List<NewsPromotion> newsPromotions;
private boolean promos;
public NewsAdapter(List<NewsPromotion> newsPromotions, boolean promos) {
this.newsPromotions = newsPromotions;
this.promos = promos;
}
public void setData(List<NewsPromotion> newsPromotions){
this.newsPromotions = newsPromotions;
}
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
RecyclerView.ViewHolder viewHolder;
if(promos) {
View mView = LayoutInflater.from(parent.getContext()).inflate(R.layout.promo_recyclerview_item,
parent, false);
viewHolder = new PromoViewHolder(mView);
}else {
View mView = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_item_row,
parent, false);
viewHolder = new NewsViewHolder(mView);
}
return viewHolder;
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder holder, int position) {
Log.d("Adapter", newsPromotions.get(position).title);
if(promos){
PromoViewHolder viewHolder = (PromoViewHolder) holder;
Picasso.get().load(RestClient.BASE_IMAGE_URL + newsPromotions.get(position).image).into(viewHolder.mImage);
}else {
NewsViewHolder viewHolder = (NewsViewHolder) holder;
Picasso.get().load(RestClient.BASE_IMAGE_URL + newsPromotions.get(position).image).into(viewHolder.mImage);
viewHolder.mTitle.setText(newsPromotions.get(position).title);
viewHolder.mDescription.setText(newsPromotions.get(position).content);
}
}
#Override
public int getItemCount() {
return newsPromotions.size();
}
public class NewsViewHolder extends RecyclerView.ViewHolder {
ImageView mImage;
TextView mTitle;
TextView mDescription;
private NewsViewHolder(View itemView) {
super(itemView);
mImage = itemView.findViewById(R.id.ivImage);
mTitle = itemView.findViewById(R.id.tvTitle);
mDescription = itemView.findViewById(R.id.tvDescription);
}
}
public class PromoViewHolder extends RecyclerView.ViewHolder {
ImageView mImage;
private PromoViewHolder(View itemView) {
super(itemView);
mImage = itemView.findViewById(R.id.ivImage);
}
}
}
And the following is how I initialize the two adapters in the Fragment:
RecyclerView promoRecycleView = activity.findViewById(R.id.promo_recyclerview);
promoAdapter = new NewsAdapter(new ArrayList<NewsPromotion>(), true);
promoRecycleView.setAdapter(promoAdapter);
RecyclerView newsRecycleView = activity.findViewById(R.id.news_recyclerview);
newsAdapter = new NewsAdapter(new ArrayList<NewsPromotion>(), false);
newsRecycleView.setAdapter(newsAdapter);
Finally, this is how I send the object to the adapters:
promoAdapter.setData(promos);
promoAdapter.notifyDataSetChanged();
newsAdapter.setData(news);
newsAdapter.notifyDataSetChanged();

Please post your adapter and item_layout. Because your given layout is working perfectly for me.

No issue with your layout i have run in myAppliaction, some issue in Adapter, please post/paste your activity and adapter code.

If you would check documentation on the RecyclerView, you will see that you need to specify size of the list. There is no wrap content for RecyclerView, because it's dynamic widget. So you would need to align your implementation for something like next.
<?xml version="1.0" encoding="utf-8"?>
<NestedScrollView
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:id="#+id/profile_coordinator"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".HomeFragment">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="20dp">
<!-- Here I have some other views (ImageView, TextView, etc.) -->
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/active_promos"
android:textStyle="bold"
android:textColor="#color/colorPrimary"
android:textSize="18sp"
android:layout_marginBottom="10sp"/>
<!-- Horizontal List of RecyclerView -->
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/promo_recyclerview"
android:layout_width="match_parent"
android:layout_height="200dp"
android:orientation="horizontal"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
android:layout_marginBottom="20sp"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/news"
android:textStyle="bold"
android:textColor="#color/colorPrimary"
android:textSize="18sp"
android:layout_marginBottom="10sp"/>
<!-- Vertical List of RecyclerView -->
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/news_recyclerview"
android:layout_width="match_parent"
android:layout_height="500dp" />
</LinearLayout>
</LinearLayout>
</ScrollView>

ScrollView not scrolling smooth with inside 3 recyclerviews

Here is my code.i want to put 3 recyclerViews in my layout but it is very slow on device while running. If there is 2 recyclerview it works smooth but if 3 slow very :
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
android:id="#+id/scroll_view"
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="wrap_content"
tools:context=".fragments.MainFragment">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:textColor="#color/blacker"
android:textStyle="bold"
android:textSize="18sp"
android:text="Техника для офиса"
android:layout_marginTop="20dp"
android:layout_marginLeft="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp" />
<android.support.v7.widget.RecyclerView
android:nestedScrollingEnabled="false"
android:fillViewport="true"
android:layout_marginBottom="15dp"
android:layout_marginTop="15dp"
android:id="#+id/recyclerView_popular_goods"
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
<TextView
android:textColor="#color/blacker"
android:textStyle="bold"
android:textSize="18sp"
android:text="Компьютерная техника"
android:layout_marginTop="20dp"
android:layout_marginLeft="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp" />
<android.support.v7.widget.RecyclerView
android:nestedScrollingEnabled="false"
android:fillViewport="true"
android:layout_marginBottom="15dp"
android:layout_marginTop="15dp"
android:id="#+id/recyclerView_competitive_goods"
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
<TextView
android:textColor="#color/blacker"
android:textStyle="bold"
android:textSize="18sp"
android:text="Канцелярские товары"
android:layout_marginTop="20dp"
android:layout_marginLeft="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp" />
<android.support.v7.widget.RecyclerView
android:visibility="gone"
android:fillViewport="true"
android:layout_marginBottom="15dp"
android:layout_marginTop="15dp"
android:id="#+id/recyclerView_stationery_goods"
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
</LinearLayout>
Please if somebody had such kind of problem please help me to fix my issue.
I tried Nested scrollview and setNestedScrollingEnabled = false.but nothing helps
Here is my Activity
#SuppressLint("ValidFragment")
public class MainFragment extends BasicFragment implements
MainFragmentView, PopularGoodsAdapter.ProductListener {
#BindView(R.id.scroll_view)
NestedScrollView mScrollView;
#BindView(R.id.recyclerView_stationery_goods)
RecyclerView mRecyclerViewStationeryGoods;
#BindView(R.id.recyclerView_popular_goods)
RecyclerView mRecyclerViewPopularGoods;
#BindView(R.id.recyclerView_competitive_goods)
RecyclerView mRecyclerViewCompetitiveGoods;
#BindView(R.id.imageSlider)
SliderView mSliderView;
#Inject
Navigator mNavigator;
#Inject
#Named(DISPLAY_WIDTH)
int mDisplayWidth;
#InjectPresenter
MainFragmentPresenter mPresenter;
List<Product> list1;
List<Product> list2;
List<Product> list3;
private PopularGoodsAdapter mAdapterPopularGoods;
private PopularGoodsAdapter mAdapterPopularGoods2;
private PopularGoodsAdapter mAdapterPopularGoods3;
private LayoutAnimationController layoutAnimationController;
private List<String> images;
#SuppressLint("ValidFragment")
public MainFragment() {
}
private void initView(View view) {
ButterKnife.bind(this,view);
images = new LinkedList<>();
images.add("https://images.pexels.com/photos/747964/pexels-photo-747964.jpeg?auto=compress&cs=tinysrgb&h=750&w=1260");
images.add("https://images.pexels.com/photos/929778/pexels-photo-929778.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260");
images.add("https://images.pexels.com/photos/218983/pexels-photo-218983.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260");
mSliderView.setSliderAdapter(new SliderAdapterExample(getContext(), images, "mainPage"));
LinearLayoutManager layoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.HORIZONTAL, false);
LinearLayoutManager layoutManager2 = new LinearLayoutManager(getContext(), LinearLayoutManager.HORIZONTAL, false);
LinearLayoutManager layoutManager3 = new LinearLayoutManager(getContext(), LinearLayoutManager.HORIZONTAL, false);
mRecyclerViewPopularGoods.setLayoutManager(layoutManager);
layoutAnimationController = AnimationUtils.loadLayoutAnimation(getContext(),R.anim.layout_item_from_left);
list1 = new LinkedList<>();
mRecyclerViewPopularGoods.setLayoutAnimation(layoutAnimationController);
mRecyclerViewCompetitiveGoods.setLayoutManager(layoutManager2);
list2 = new LinkedList<>();
mRecyclerViewCompetitiveGoods.setLayoutAnimation(layoutAnimationController);
mRecyclerViewStationeryGoods.setLayoutManager(layoutManager3);
list3 = new LinkedList<>();
mRecyclerViewStationeryGoods.setLayoutAnimation(layoutAnimationController);
mRecyclerViewPopularGoods.setAdapter(mAdapterPopularGoods = new PopularGoodsAdapter(getContext(),list1,mDisplayWidth,"popular",this));
mRecyclerViewCompetitiveGoods.setAdapter(mAdapterPopularGoods2 = new PopularGoodsAdapter(getContext(),list2,mDisplayWidth,"competitive",this));
mRecyclerViewStationeryGoods.setAdapter(mAdapterPopularGoods3 = new PopularGoodsAdapter(getContext(),list3,mDisplayWidth,"stationery",this));
mRecyclerViewPopularGoods.setNestedScrollingEnabled(false);
mRecyclerViewCompetitiveGoods.setNestedScrollingEnabled(false);
mRecyclerViewStationeryGoods.setNestedScrollingEnabled(false);
getLoadingDialog().showDialog(getFragmentManager());
mPresenter.GET_TOP_HOME_VIEW();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup
container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_main, container,
false);
initView(view);
return view;
}
#OnClick({R.id.item_sellers,
R.id.item_price_request,R.id.item_price_competitions})
void Onclick(View view) {
switch (view.getId()) {
case R.id.item_sellers:
mNavigator.toSellersActivty(getContext());
break;
case R.id.item_price_request:
mNavigator.toPriceRequestActivty(getContext());
break;
case R.id.item_price_competitions:
mNavigator.toCompetitionsActivty(getContext());
break;
}
}
#Override
public void initTopHomeView(List<HomeViewObject> result) {
if (null != result ) {
if (result.size() >= 1 && null != result.get(0)) {
list1.addAll(result.get(0).getTopProducts());
mAdapterPopularGoods.notifyDataSetChanged();
mRecyclerViewPopularGoods.setLayoutAnimation(layoutAnimationController);
}
if (result.size() >= 2 && null != result.get(1)) {
list2.addAll(result.get(1).getTopProducts());
mAdapterPopularGoods2.notifyDataSetChanged();
mRecyclerViewPopularGoods.setLayoutAnimation(layoutAnimationController);
}
if (result.size() >= 3 && null != result.get(2)) {
list3.addAll(result.get(2).getTopProducts());
mAdapterPopularGoods3.notifyDataSetChanged();
mRecyclerViewStationeryGoods.setLayoutAnimation(layoutAnimationController);
}
}
}
#Override
public void stopProgress() {
getLoadingDialog().hideDialog();
}
#Override
public void onProductClicked(Product product) {
mNavigator.toProductActivity(getContext(),product);
}
}
Is there any mistake?

Try the following -
Try to put all the views inside NestedScrollView i.e, root view.
Set recyclerView.setNestedScrollingEnabled(false); for both the recyclerViews in your xml.

Change your recycler view's android:layout_height="match_parent" to android:layout_height="wrap_content" and then use Nested scrollView with recyclerView.setNestedScrollingEnabled(false);

try to change your ScrollView with NestedScrollViewand Change your recycler view's android:layout_height="match_parent" to android:layout_height="wrap_content" :
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView
android:id="#+id/scroll_view"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context=".fragments.MainFragment">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:textColor="#color/blacker"
android:textStyle="bold"
android:textSize="18sp"
android:text="Техника для офиса"
android:layout_marginTop="20dp"
android:layout_marginLeft="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp" />
<android.support.v7.widget.RecyclerView
android:nestedScrollingEnabled="false"
android:fillViewport="true"
android:layout_marginBottom="15dp"
android:layout_marginTop="15dp"
android:id="#+id/recyclerView_popular_goods"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:textColor="#color/blacker"
android:textStyle="bold"
android:textSize="18sp"
android:text="Компьютерная техника"
android:layout_marginTop="20dp"
android:layout_marginLeft="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp" />
<android.support.v7.widget.RecyclerView
android:nestedScrollingEnabled="false"
android:fillViewport="true"
android:layout_marginBottom="15dp"
android:layout_marginTop="15dp"
android:id="#+id/recyclerView_competitive_goods"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:textColor="#color/blacker"
android:textStyle="bold"
android:textSize="18sp"
android:text="Канцелярские товары"
android:layout_marginTop="20dp"
android:layout_marginLeft="15dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp" />
<android.support.v7.widget.RecyclerView
android:visibility="gone"
android:fillViewport="true"
android:layout_marginBottom="15dp"
android:layout_marginTop="15dp"
android:id="#+id/recyclerView_stationery_goods"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
and :
RecyclerView recycleView1 = (RecyclerView) findViewById(R.id.recyclerView_popular_goods);
RecyclerView recycleView2 = (RecyclerView) findViewById(R.id.recyclerView_competitive_goods);
RecyclerView recycleView3 = (RecyclerView) findViewById(R.id.recyclerView_stationery_goods);
recycleView1.setNestedScrollingEnabled(false);
recycleView2.setNestedScrollingEnabled(false);
recycleView3.setNestedScrollingEnabled(false);
If your devices API is below v 21, use the following:
ViewCompat.setNestedScrollingEnabled(recycleView1, false);
ViewCompat.setNestedScrollingEnabled(recycleView2, false);
ViewCompat.setNestedScrollingEnabled(recycleView3, false);

Your design needs to change. As soon as you're adding RecyclerView with nested scrolling disabled, you should keep in mind that view will have its items created all at once.
It basically means no typical RecyclerView optimization magic when only needed amount of items is created and rendered, then reused, based on screen real estate etc.
In your case the situation is even less good as you have 3 such RecyclerViews. The performance of your solution will of course depend on hardware and number of items inside each RecyclerView, but pls do consider using just ONE RecyclerView and no ScrollView at all.

Finally I achieved.I used NestedScrollView as root.And used only 1 recyclerview.And in adapter of this recyclerview I created other recyclerViews.Scrolling smooth Thanks #Venky

Android Stackoverflow Errror: ViewGroup.jumpDrawablesToCurrentState

I have a problem. I got an Stackoverflow Error. I tried reduced the Layout and so on. But nothing worked.
I have a view pager and in the fragments are recyclerviews 4 times. (one in each). The inflater Code
View root = inflater.inflate(R.layout.content_main, container, false);
One Layout in Fragment for example:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView
android:id="#+id/list_view"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_margin="10dp"
android:layout_marginTop="15dp"
android:layout_height="wrap_content" />
And this is the Layout for the ReclerView Item
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
android:id="#+id/cv"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_margin="20dp"
android:clickable="true"
android:background="?attr/selectableItemBackground"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center|left"
android:padding="10dp"
android:clickable="true"
android:background="?attr/selectableItemBackground"
>
<ImageView
android:id="#+id/album_cover"
android:layout_width="33dp"
android:layout_height="50dp"
android:layout_marginRight="16dp"
android:src="#drawable/ic_supervisor_account_black_24dp" />
<TextView
android:id="#+id/album_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Artistname"
android:textColor="#000000"
android:textSize="15sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
One Layout has a Relative Layout but it works before I made some changes:
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/cv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clickable="true"
android:background="?attr/selectableItemBackground"
android:layout_margin="10dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="16dp"
android:clickable="true"
android:longClickable="true"
android:background="?attr/selectableItemBackground"
>
<ImageView
android:id="#+id/album_cover"
android:layout_width="66dp"
android:layout_height="50dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginRight="16dp"
android:src="#drawable/spring_276014_640" />
<TextView
android:id="#+id/album_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/album_cover"
android:text="Albumtitel"
android:textColor="#000000"
android:textSize="20sp" />
<TextView
android:id="#+id/album_artist"
android:layout_width="wrap_content"
android:layout_marginTop="5dp"
android:layout_height="wrap_content"
android:layout_below="#+id/album_name"
android:layout_toRightOf="#+id/album_cover"
android:text="von Artist xy" />
</RelativeLayout>
</android.support.v7.widget.CardView>
Captureing View Table is not possible because app is going down before it changes the layout.
Bitmaps are scaled.
Here is my Adapter:
public class DefaultAdapter extends RecyclerView.Adapter<DefaultAdapter.SongViewHolder> {
private Context con;
private List<String> names;
boolean useplaylist;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public static class SongViewHolder extends RecyclerView.ViewHolder {
CardView cv;
TextView title;
SongViewHolder(View itemView) {
super(itemView);
cv = (CardView)itemView.findViewById(R.id.cv);
title = (TextView)itemView.findViewById(R.id.album_name);
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public DefaultAdapter(Context context,List<String> names,boolean playlist) {
con = context;
this.names = names;
useplaylist = playlist;
}
// Create new views (invoked by the layout manager)
#Override
public SongViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.playlist_item, viewGroup, false);
SongViewHolder pvh = new SongViewHolder(v);
return pvh;
}
#Override
public void onBindViewHolder(SongViewHolder personViewHolder, int i) {
personViewHolder.title.setText(names.get(i));
}
// Return the size of your dataset (invoked by the layout manager)
#Override
public int getItemCount() {
return names.size();
}
#Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
}
Log:
java.lang.StackOverflowError: stack size 8MB\n
at android.view.ViewGroup.jumpDrawablesToCurrentState(ViewGroup.java:6108)
at android.view.ViewGroup.jumpDrawablesToCurrentState(ViewGroup.java:6112)
at android.view.ViewGroup.jumpDrawablesToCurrentState(ViewGroup.java:6112)
at android.view.ViewGroup.jumpDrawablesToCurrentState(ViewGroup.java:6112)
at android.view.ViewGroup.jumpDrawablesToCurrentState(ViewGroup.java:6112)
at android.view.ViewGroup.jumpDrawablesToCurrentState(ViewGroup.java:6112)
Can somebody help me?

Problem solved.
I don't know where the Error was but maby it was an empty list or the ImageAssets wich I replaced with vector assets and activate the Libary in the Gradle.
For thoos who have the same problem in a viewpage: Deactivate all fragments and enable them single, to test where the error is.

add elements in fragment's view android

I'm new to Android, I have a fragment which have this XML code
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp"
android:orientation="vertical"
android:id="#+id/linearRoot"
>
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cv"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="16dp"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/person_name"
android:layout_alignParentTop="true"
android:textSize="30sp"
android:text="bonjour"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/person_age"
android:layout_below="#+id/person_name"
android:text="ce test a réussi"
/>
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
</ScrollView>
With this one, I want to add several CardView Dynamically.So, as a test, I'm trying to add a second CardView in the LinearLayout this way :
public class TopRatedFragment extends Fragment {
LinearLayout ll;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_top_rated, container, false);
ll = (LinearLayout)rootView.findViewById(R.id.linearRoot);
CardView cv = new CardView(getActivity().getApplicationContext());
ll.addView(cv);
return rootView;
}
}
but it does nothing at all. I'm wondering what is the right way to do this.

you have to add LayoutParams (width, height) in order to actually show your CardView
cv.setLayoutParams(new ViewGroup.LayoutParams(20,20));
for example with 20dp width and height