Develop Reference

SwipeRefreshLayout with RecyclerView not working in Fragment

I have a recyclerview inside SwipeRefreshLayout in a fragment. I have implemented AsyncTask to fetch data for recyclerview. The problem is SwipeRefreshLayout does not show at all, and hence the data is not populated in recyclerview. I have done the same thing for Activity and it works just fine but not in fragment. Can anybody guide me what am I doing wrong?
This is the layout file for fragment:
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".FeatureFragment">
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="#+id/refresh_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent">
</androidx.recyclerview.widget.RecyclerView>
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
</LinearLayout>
And here is what I've done in the fragment class.
public class FeaturedFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener {
private RecyclerView mRecyclerView;
private SwipeRefreshLayout mSwipeLayout;
public FeaturedFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_featured_captions, container, false);
mRecyclerView = view.findViewById(R.id.recyclerView);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
mSwipeLayout = view.findViewById(R.id.refresh_layout);
mSwipeLayout.setOnRefreshListener(this);
return view;
}
#Override
public void onRefresh() {
new FetchFeedTask().execute((Void) null);
}
private class FetchFeedTask extends AsyncTask<Void, Void, Boolean> {
#Override
protected void onPreExecute() {
mSwipeLayout.setRefreshing(true);
}
#Override
protected Boolean doInBackground(Void... voids) {
//things to do in background
}
#Override
protected void onPostExecute(Boolean success) {
mSwipeLayout.setRefreshing(false);
mRecyclerView.setAdapter(/*adapter*/);
//things to do at the end
}
}
}

It's too late to answer here but might help someone else.
I faced the same issue and it is because the recyclerView is immediate child of swipeRefreshLayout so simply put the recyclerView in a layout (for example ConstraintLayout) and then put this layout in your swipeRefreshLayout and everything will work as you expected.

May your code not working because of ReacyclerView scroll Listener
Try below snipped.
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener(){
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
int topRowVerticalPosition =
(recyclerView == null || recyclerView.getChildCount() == 0) ? 0 : recyclerView.getChildAt(0).getTop();
mSwipeLayout.setEnabled(topRowVerticalPosition >= 0);
}
#Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
}
});
Also, add your initialization stuff inside onViewCreated() like below
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_featured_captions, container, false);
return view;
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mRecyclerView = view.findViewById(R.id.recyclerView);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
mSwipeLayout = view.findViewById(R.id.refresh_layout);
mSwipeLayout.setOnRefreshListener(this);
}

Change the height of swipelayout to wrap_content
Solution 1 :)
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="#+id/refresh_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
Solution 2:) Use swipe layout and recycler view using design library
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/swipe_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
</android.support.v4.widget.SwipeRefreshLayout>

Use NestedScrollView . put your recycleview or listview inside it. with
android:nestedScrollingEnabled="true"
Complete example -
<androidx.core.widget.NestedScrollView
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:isScrollContainer="false"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="fill_vertical"
android:clipToPadding="false"
android:fillViewport="true"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.customfont.MyTextView
android:id="#+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text=" Title"
android:textSize="22dp"
android:textColor="#color/black"/>
<com.customfont.MyTextView
android:id="#+id/title2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text=" Title"
android:textSize="22dp"
android:textColor="#color/black"/>
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="#+id/mSwipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:ignore="MissingConstraints">
<com.pagenia.app.exoplayer.utils.ExoPlayerRecyclerView
android:id="#+id/exoPlayerRecyclerView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:nestedScrollingEnabled="true"
android:background="#FFFFFF"
android:dividerHeight="8dp" />
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>
</LinearLayout>
</androidx.core.widget.NestedScrollView>

Try using the below snippet:
Always use support library widgets. instead of these:
<androidx.recyclerview.widget.RecyclerView
and
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
So:
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/swipeRefresh"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</android.support.v4.widget.SwipeRefreshLayout>

smooth scrolling for recyclerview

I got some problems in scrolling the recyclerview. I added the smoothScrollToPosition method to LinearLayoutManager but it didn't change anything.I tried to added the attribute named app:fastScrollEnabled but it caused error. I want a smooth scrolling. What should i do? Thank you in advance :)
XML Code:
<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/stu_toolbar"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#a653a3"
app:layout_scrollFlags="scroll|enterAlways">
<ImageView
android:id="#+id/check_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:layout_margin="#dimen/normal_margin"
android:src="#drawable/ic_done_white_24dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:layout_marginRight="#dimen/normal_margin"
android:text="دانش آموزان"
android:textSize="20sp" />
</android.support.v7.widget.Toolbar>
<android.support.design.widget.CollapsingToolbarLayout
android:id="#+id/collpase_view_pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_scrollFlags="scroll|enterAlways">
<android.support.v4.view.ViewPager
android:id="#+id/slide_show"
android:layout_width="match_parent"
android:layout_height="150dp" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycle2"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>
Java Code:
public class Student extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.student_list);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycle2);
LinearLayoutManager layoutManager = new LinearLayoutManager(this) {
#Override
public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, int position) {
LinearSmoothScroller smoothScroller = new LinearSmoothScroller(Student.this) {
private static final float SPEED = 300f;
#Override
protected float calculateSpeedPerPixel(DisplayMetrics displayMetrics) {
return SPEED / displayMetrics.densityDpi;
}
};
smoothScroller.setTargetPosition(position);
startSmoothScroll(smoothScroller);
}
};
recyclerView.setLayoutManager(layoutManager);
AdapterSTList adapterSTList = new AdapterSTList(this, Generator.getStudents());
recyclerView.setAdapter(adapterSTList);
ViewPager viewPager = (ViewPager) findViewById(R.id.slide_show);
ImageView check_btn = (ImageView) findViewById(R.id.check_button);
ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(this);
viewPager.setAdapter(viewPagerAdapter);
check_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(Student.this,Main.class);
startActivity(intent);
}
});
}
}

Its because your recycler view is inside a nested Scroll view.
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycle2"
android:nestedScrollingEnabled="false"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
also in your code do this to support older devices :
recyclerView.setNestedScrollingEnabled(false);

Add this line recyclerView.invalidate(); after recyclerView.setAdapter(adapterSTList);

Two recyclerview when i scroll down , the first recylcer to be scrolled too, how?

I want to have 2 grid images one vertical and second horizontal(recyclerview1 and recyclerview2), the first I want it to be always top and to be scrolled right and left, however when I scroll the second grid view , I want the first to be scrolled too as they are in one scroller
example:
when I scroll down in the second recyclerview (recyclerview2) , i want the first recycler to be scrolled too. How to do that ?
result:
this is my code:
Main activity code:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// initToolbars();
recyclerView = (RecyclerView) findViewById(R.id.recyclerview1);
recylerViewLayoutManager = new LinearLayoutManager(context,LinearLayoutManager.HORIZONTAL,false);
recyclerView.setLayoutManager(recylerViewLayoutManager);
recyclerViewAdapter = new RecyclerViewAdapter(MainActivity.this, subjects,images);
recyclerView.setAdapter(recyclerViewAdapter);
MainGridRecView = (RecyclerView) findViewById(R.id.maingridrc);
MainGridRecViewLayoutManager = new GridLayoutManager(context,2);
MainGridRecView.setLayoutManager(MainGridRecViewLayoutManager);
MainGridRecViewAdapter = new MainGridRecyclerViewAdapter(MainActivity.this, subjects,images);
MainGridRecView.setAdapter(MainGridRecViewAdapter);
activity xml:
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/liner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<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"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<TextView
android:id="#+id/textView3"
android:layout_width="match_parent"
android:layout_height="25dp"
android:layout_above="#+id/recyclerview1"
android:gravity="center"
android:background="#10bcc9"
android:textColor="#android:color/white"
android:text="New Games." />
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerview1"
android:layout_width="wrap_content"
android:layout_height="140dp"
android:scrollbars="horizontal" />
<TextView
android:id="#+id/textView4"
android:layout_width="match_parent"
android:layout_height="25dp"
android:layout_below="#+id/recyclerview1"
android:gravity="center"
android:background="#10bcc9"
android:textColor="#android:color/white"
android:text="Used Games." />
<android.support.v7.widget.RecyclerView
android:id="#+id/maingridrc"
android:layout_width="wrap_content"
android:layout_height="330dp"
android:layout_marginTop="5dp"
android:scrollbars="vertical" />
<!-- <android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
android:src="#android:drawable/ic_dialog_email" />-->
</LinearLayout>
adapter
public class RecyclerViewAdapter extends RecyclerView.Adapter<Viewholder>{
String[] SubjectValues;
String[] imageValues;
Context mContext;
View view1;
ViewHolder viewHolder1;
// TextView textView;
public RecyclerViewAdapter(Context context,String[] SubjectValues1, String[] images){
SubjectValues = SubjectValues1;
imageValues= images;
mContext = context;
}
public static class ViewHolder extends RecyclerView.ViewHolder{
public ViewHolder(View v){
super(v);
}
}
#Override
public Viewholder onCreateViewHolder(ViewGroup parent, int viewType){
view1 = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_items,parent,false);
// viewHolder1 = new Viewholder(view1);
Viewholder vh = new Viewholder(view1, new Viewholder.IMyViewHolderClicks() {
public void onPotato(View caller) { Log.d("VEGETABLES", "Poh-tah-tos");
Intent intent = new Intent(mContext,SingleObjectActivity.class);
mContext.startActivity(intent);
};
public void onTomato(ImageView callerImage) {
Log.d("VEGETABLES", "To-m8-tohs");
// v1 CategoryList mDataset = new CategoryList(getOrder(), getId(), item.getUrl(), item.getUserName(), item.getLikes());
Intent intent = new Intent(mContext,SingleObjectActivity.class);
mContext.startActivity(intent);
}
});
return vh;
}
#Override
public void onBindViewHolder(Viewholder holder, int position){
holder.txtViewTitle.setText(SubjectValues[position]);
holder.imgViewIcon.setImageResource(R.drawable.ghost_recon);
}
#Override
public int getItemCount(){
return SubjectValues.length;
}
}
recycler xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/imagecateg"
android:layout_width="180dp"
android:layout_height="160dp"
android:layout_alignParentTop="true"
/>
<TextView
android:id="#+id/txtview"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_below="#+id/imagecateg"
android:paddingLeft="35dp"
android:textSize="15dp"
android:textStyle="bold"
android:background="#f4e04c"
android:textColor="#color/colorPrimary"
/>
</RelativeLayout>

If you want to scroll entire layout when 2nd recycler view is being scrolled -> you can add your first recycler view as 1st item of the second recycler view, in this case they will behave like one recycler view.
I was able to implement a quick example, code is not brilliant, but it is reflecting general idea, pushed to github
Here is the main file with logic in the first RecyclerView adapter.

do some thing like this in your layout file.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="#+id/horizenatlScrollView"
android:layout_width="match_parent"
android:layout_height="100dp" />
<android.support.v7.widget.RecyclerView
android:id="#+id/verticalScrollView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
and here is java code.
CustomAdapterHorizenatol horizontalAdapter = new
CustomAdapterHorizenatol(horizontalList);
LinearLayoutManager horizontalLayoutManagaer
= new LinearLayoutManager(MainActivity.this,
LinearLayoutManager.HORIZONTAL, false);
horizontal_recycler_view.setLayoutManager(horizontalLayoutManagaer);
horizontal_recycler_view.setAdapter(horizontalAdapter);
CustomAdapterVertical vertical = new
CustomAdapterVertical(horizontalList);
verticalScrollView.setNestedScrollingEnabled(false);
verticalScrollView.setHasFixedSize(false);
LinearLayoutManager verticallLayoutManagaer
= new LinearLayoutManager(MainActivity.this,
LinearLayoutManager.VERTICAL, false);
verticalScrollView.setLayoutManager(verticallLayoutManagaer);
verticalScrollView.setAdapter(vertical);

CardView not shown in RecyclerView

I have a problem which is driving me nuts. Basically it is a simple RecyclerView which displays a cardview. There are a lot of posts out there already, which I checked. I have assigned a LayoutManager as indicated here (RecyclerView Not Displaying Any CardView Items) , I have implemented the getItemCount method as explained here (card view not showing up), and I changed to the following versions (changing version was suggested here RecyclerView of cards not showing anything):
compile 'com.android.support:support-v4:24.0.0'
compile 'com.android.support:cardview-v7:24.0.0'
compile 'com.android.support:recyclerview-v7:24.0.0'
I also did the notifyDataSetChanged() as indicated here (RecyclerView Not Displaying Any CardView Items). However, nothing fixed it for me.
I have an Activity which has the following code (only relevant sections, getDummyData returns a List with 1 dummy data):
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
DatabaseHelper databaseHelper = new DatabaseHelper(getApplicationContext());
setContentView(R.layout.activity_overview);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
RecyclerView rv = (RecyclerView) findViewById(R.id.rv);
rv.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
rv.setLayoutManager(linearLayoutManager);
RVAdapter adapter = new RVAdapter(getDummyData());
rv.setAdapter(adapter);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
adapter.notifyDataSetChanged();
}
public class RVAdapter extends RecyclerView.Adapter<RVAdapter.DocumentViewHolder> {
List<Document> DocumentList;
public RVAdapter(List<Document> Documents) {
this.DocumentList = Documents;
}
#Override
public DocumentViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.document_item, parent, false);
DocumentViewHolder pvh = new DocumentViewHolder(v);
return pvh;
}
#Override
public void onBindViewHolder(DocumentViewHolder DocumentViewHolder, int i) {
DocumentViewHolder.Date.setText(DocumentList.get(i).getCreatedFormatted());
DocumentViewHolder.participants.setText(DocumentList.get(i).getParticipants(getApplicationContext()));
DocumentViewHolder.counterOfItems.setText(DocumentList.get(i).getcounterOfItems(getApplicationContext()) + StringUtils.EMPTY);
}
#Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
#Override
public int getItemCount() {
//return DocumentList.size();
return 1;
}
public class DocumentViewHolder extends RecyclerView.ViewHolder {
TextView Date;
TextView participants;
TextView ideasPreview;
TextView counterOfItems;
ImageView Photo;
public DocumentViewHolder(View itemView) {
super(itemView);
Date = (TextView) itemView.findViewById(R.id._date);
participants = (TextView) itemView.findViewById(R.id.participants);
ideasPreview = (TextView) itemView.findViewById(R.id.ideas_preview);
counterOfItems = (TextView) itemView.findViewById(R.id.counter_of_items);
Photo = (ImageView) itemView.findViewById(R.id._photo);
}
}
}
And I have a Document_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="match_parent"
android:orientation="vertical">
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:id="#+id/card_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
card_view:cardCornerRadius="#dimen/_card_corner">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/_photo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.25" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingEnd="#dimen/activity_horizontal_margin"
android:paddingStart="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin">
<TextView
android:id="#+id/_date"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="21st June 2016" />
<TextView
android:id="#+id/participants"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Thomas, Christian and Johann" />
<TextView
android:id="#+id/counter_of_items"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Thomas, Christian and Johann" />
<TextView
android:id="#+id/ideas_preview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Hello, Test, Test, Test" />
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
The activity's xml looks like this:
<?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"
android:fitsSystemWindows="true"
tools:context="com.chmaurer.idea.OverviewActivity">
<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"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/rv"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
android:src="#drawable/ic_playlist_add_white_24dp" />
</android.support.design.widget.CoordinatorLayout>
The code is compiling and executing normally, but no cards are shown. I have tried a few hour for myself now, but it is definitely the point where I'd be glad to have a hint...

Your code is fine, The problem is with layout file: document_item.xml:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/_photo"
android:layout_width="wrap_content" -->mistake
android:layout_height="wrap_content"
android:layout_weight="0.25" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent" -->mistake
android:gravity="center_horizontal"
android:orientation="vertical"
...
The second LinearLayout gets its height from parent (first LinearLayout), and the first one gets its height from its only child: ImageView (so without no drawable set, the second layout's height will be zero! ), if you set a drawable for ImageView (in onBindViewHolder method or in layout xml file) it probably crops some of TextView items, Also when you set android:layout_width to "wrap_content", actually you're ignoring layout_weight.
So edit layout file like this:
...
<ImageView
android:id="#+id/_photo"
android:layout_width="0dp"
android:layout_gravity="center_vertical"
android:layout_height="wrap_content"
android:layout_weight="0.25" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
...

You are using RecyclerView with vertical orientation (in Java code)
In the Activity XML you are setting the layout height to Wrap_Content
The card layout also has an height of match_parent
They will not work like that, I lost three days on this
Try to give fix height to your card layout, test also other alteration of other layout, it will work for you
Good luck

Just try after adding this line inside your recyclerview:
app:layout_behavior="#string/appbar_scrolling_view_behavior"
like this:
<android.support.v7.widget.RecyclerView
android:id="#+id/rv"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
</android.support.v7.widget.RecyclerView>
Hope it will help you.

Swipe Refresh Layout onRefresh working but not displaying refresh indicator

I've implemented a swipe refresh layout onto one of my List Views however the view is not sliding down when I swipe and the icon is not visible. Even though it seems it doesn't work, it does actually fire off the OnRefresh listener.
Also I think its worth mentioning that I'm using the ListView on a fragment so i'm initializing the listener in the fragment activity which is displayed below.
Swipe Refresh XML
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/swipe_refresh_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/listView"
android:layout_gravity="center_horizontal"
android:dividerHeight="1sp"
android:translationZ="5dp"
android:background="#color/background_gray"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:clickable="true"
/>
</android.support.v4.widget.SwipeRefreshLayout>
Fragment Activity
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
final SwipeRefreshLayout mSwipeRefreshLayout = (SwipeRefreshLayout) getActivity().findViewById(R.id.swipe_refresh_layout);
ListView lView = (ListView) getActivity().findViewById(R.id.listView);
mSwipeRefreshLayout.setColorScheme(android.R.color.holo_blue_bright,
android.R.color.holo_green_light,
android.R.color.holo_orange_light,
android.R.color.holo_red_light);
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
mSwipeRefreshLayout.setRefreshing(true);
((MainActivity) getActivity()).refresh();
new Handler().postDelayed(new Runnable() {
#Override public void run() {
mSwipeRefreshLayout.setRefreshing(false);
}
}, 5000);
}
});
lView.setOnScrollListener(new AbsListView.OnScrollListener() {
#Override
public void onScrollStateChanged(AbsListView absListView, int i) {
}
#Override
public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if (firstVisibleItem == 0)
mSwipeRefreshLayout.setEnabled(true);
else
mSwipeRefreshLayout.setEnabled(false);
}
});
}

I solved it, it appears that this is a current bug with the SwipeRefreshLayout. It will only work when Listview is wrapped inside a FrameLayout.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/swipe_refresh_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/listView"
android:layout_gravity="center_horizontal"
android:dividerHeight="1sp"
android:translationZ="5dp"
android:background="#color/background_gray"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:clickable="true"
/>
</FrameLayout>
</android.support.v4.widget.SwipeRefreshLayout>

Simply set the property [android:clickable="true"] for the Immediate clild layout of SwipeRefreshLayout which occupies complete screen area.i.e. whose width and height is match_parent.
<?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.support.v4.widget.SwipeRefreshLayout
android:id="#+id/srlayout_Container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentBottom="true">
<RelativeLayout
android:id="#+id/rl_MainContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true">
<!-- Placeholder for Other View or ViewGroup as Clild -->
</RelativeLayout>
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>