adapter for recyclerview in android

adapter for recyclerview in android - android

currently i am working on a android project.
where i have two String[], now i want to display the data of bothe String[] on my activity.but with my code i am only able to display the data of one String[].
plz check my code.
file name:MyAdapter4.java
public class MyAdapter4 extends RecyclerView.Adapter<MyAdapter4.MyViewHolder> {
private String[] mDataset;
// 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 MyViewHolder extends RecyclerView.ViewHolder {
public CardView cardview4;
public EditText edit4;
public TextView title4;
public MyViewHolder(View v) {
super(v);
cardview4=(CardView) v.findViewById(R.id.card_view4);
edit4=(EditText) v.findViewById(R.id.otherEdit);
title4=(TextView) v.findViewById(R.id.otherTitle);
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter4(String[] myDataset) {
mDataset = myDataset;
}
// Create new views (invoked by the layout manager)
#Override
public MyAdapter4.MyViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.other_file_layout, parent, false);
// set the view's size, margins, paddings and layout parameters
MyAdapter4.MyViewHolder vh = new MyAdapter4.MyViewHolder(v);
return vh;
}
#Override
public void onBindViewHolder(MyAdapter4.MyViewHolder holder, int position) {
holder.title4.setText(mDataset[position]);
}
#Override
public int getItemCount() {
return mDataset.length;
}
}
with this code i am only able to display Textview.... but editText is not showing data
and this is the code which i used to attach the adapter
public class FourFragment extends Fragment {
public static String[] arrayOtherTitle, arrayOtherData;
public FourFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_four, container, false);
RecyclerView rv = (RecyclerView) rootView.findViewById(R.id.rv_recycler_view4);
rv.setHasFixedSize(true);
MyAdapter2 adapter = new MyAdapter2(arrayOtherTitle);
rv.setAdapter(adapter);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
rv.setLayoutManager(llm);
return rootView;
}
}
The layout file:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_margin="4dp"
android:elevation="4dp"
android:id="#+id/card_view4"
android:layout_height="wrap_content">
<LinearLayout
android:layout_margin="16dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:orientation="horizontal">
<TextView
android:layout_width="0dp"
android:textStyle="bold"
android:layout_weight="1"
android:id="#+id/otherTitle"
android:layout_height="wrap_content"
/>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/copy"
android:layout_margin="4dp"/>
</LinearLayout>
<EditText
android:layout_width="match_parent"
android:id="#+id/otherEdit"
android:enabled="false"
android:layout_height="wrap_content"
android:background="#android:color/transparent"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
As you can see,
1)in my layout file, there are one textview and one edittext.
2)and in the class, FourFragment.java there are two String[] arrayOtherTitle, and arrayOtherData.
3)so, i want to display them on my activity.
where textview will contain data of arrayOtherTitle,
and editext will contain data of arrayOtherData.
but according to my code, currently i am only able to display data of arrayOtherTitle on textview.
and i am new in this topic,plz anyone help me to display the other arrayOtherData data on edittext.
please

Related

Migrating RecyclerView from Activity to Fragment - can't use findViewById

I copied the following code from the MainActivity to a separate fragment, but I can't get findViewById to work:
I get "cannot resolve method findViewById(int)"
these are the related files:
**Also as a beginner, could you let me know if there's a general problem with my code that needs to fixed?
MyFragment.java:
public class MyFragment extends Fragment {
public myFragment() {
// Required empty public constructor
}
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_my, container, false);
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
// use this setting to improve performance if you know that changes
// in content do not change the layout size of the RecyclerView
mRecyclerView.setHasFixedSize(true);
// use a linear layout manager
mLayoutManager = new LinearLayoutManager(getActivity());
mRecyclerView.setLayoutManager(mLayoutManager);
//placeholder data
String[] myDataset = new String[16];
myDataset[0] = "Data0";
myDataset[1] = "Data1";
myDataset[2] = "Data2";
myDataset[3] = "Data3";
myDataset[4] = "Data4";
myDataset[5] = "Data5";
myDataset[6] = "Data6";
myDataset[7] = "Data7";
myDataset[8] = "Data8";
myDataset[9] = "Data9";
myDataset[10] = "Data10";
myDataset[11] = "Data11";
myDataset[12] = "Data12";
myDataset[13] = "Data13";
myDataset[14] = "Data14";
myDataset[15] = "Data15";
// specify an adapter (see also next example)
mAdapter = new MyAdapter(myDataset);
mRecyclerView.setAdapter(mAdapter);
}
}
MyAdapter.java:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
private String[] mDataset;
// 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 MyViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView upTv;
public TextView downTv;
public View layout;
public MyViewHolder(View v) {
super(v);
layout = v;
upTv = (TextView)v.findViewById(R.id.upTv);
downTv = (TextView)v.findViewById(R.id.downTv);
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(String[] myDataset) {
mDataset = myDataset;
}
// Create new views (invoked by the layout manager)
#Override
public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.my_text_view, parent, false);
MyViewHolder vh = new MyViewHolder(v);
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
holder.upTv.setText(mDataset[position]);
holder.downTv.setText(mDataset[position]);
}
// Return the size of your dataset (invoked by the layout manager)
#Override
public int getItemCount() {
return mDataset.length;
}
}
fragment_my.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="4dp"
android:scrollbars="vertical"/>
</android.support.constraint.ConstraintLayout>
my_text_view.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:padding="6dip" >
<ImageView
android:id="#+id/icon"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true"
android:layout_marginRight="6dip"
android:contentDescription="TODO"
android:src="#drawable/ic_launcher_background" />
<TextView
android:id="#+id/downTv"
android:layout_width="fill_parent"
android:layout_height="26dip"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_toRightOf="#id/icon"
android:text="downTv"
android:textSize="12sp" />
<TextView
android:id="#+id/upTv"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_alignWithParentIfMissing="true"
android:layout_toRightOf="#id/icon"
android:gravity="center_vertical"
android:text="upTv"
android:textSize="16sp" />
</RelativeLayout>

Here's your problem:
return inflater.inflate(R.layout.fragment_my, container, false);
You cannot add more code after the return statement. You will need to take the reference of the inflated view and use it to find the reference of child views.
View rootView = inflater.inflate(R.layout.fragment_my, container, false);
mRecyclerView = (RecyclerView) rootView.findViewById(R.id.my_recycler_view);
// other code
return rootView;

A really good way to use fragments is to initialize certain variables(e.g- activity,context,root view etc) associated with the parent activity when you switch to a fragment.
for example you can do sth like,
private Context context;
private MainActivity activity; //Let MainActivity is your parent activity
private View view; //fields kept inside the fragment class,now we need to keep them initialized
//initialize activity/context from onAttach
#Override
public void onAttach(Context c) {
super.onAttach(c);
Activity a;
context=c;
if (c instanceof Activity){
a=(Activity) c;
if(a instanceof MainActivity)
activity=(MainActivity) a;
}
}
//initialize view from onViewCreated
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
this.view=view;
}
now you can use them wherever u want inside the fragment class without triggering any nullptrs and other stuff
e.g- you can go
this.view.findViewById(your_resId);
this.activity.getSupportFragmentManager();
etc and a lot of other stuffs when you need ,using these fields you initialized
also specifically in this case of using recyclerView dont forget to call,
adapter.notifyDataSetChanged() whenever you think the list you are showing in the recyclerView went through some change.

I do not have enough reputation to comment so i am writing this as answer to your comment.
You need to notify adapter using below code.
mAdapter.notifyDataSetChanged();

blank Recyclerview inside Fragment

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();

Unable to display string-array to custom Recycler View?

As I see many tutorials on website, most of they define the String data in java like String[] data={"value","value2',"value3"}; but its not the correct way in real time application i guess. In my app I will be using other languages too so I need to define in the xml. No matter i call them using below code:
onCreateView
String[] eArray=getActivity().getResources().getStringArray(R.array.english_names);
and call them like
names.add(new Name(eArray));
but when i hover mouse on eArray it shows error like Name (java.lang.String) in Name cannot be applied to (java.lang.String[])
and I know I must pass other value to array but how? I change error line and it keeps showing other and other. I google many tuts site but all of them are defining string pragmatically.
I made a custom recyclerview, Below is a code of it
cardview.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/cardview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:cardCornerRadius="8dp"
app:cardUseCompatPadding="true"
app:cardBackgroundColor="#android:color/transparent"
android:elevation="0dp">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="25sp"
android:paddingLeft="10dp"
android:textColor="#4928ef"
android:textStyle="italic"/>
</android.support.v7.widget.CardView>
recyclerview.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/linearlayout"
android:background="#drawable/big_img_boy_wp">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/rv">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
cardview.java
public class cardView extends Fragment {
TextView textView;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.card_view,container,false);
textView= (TextView) view.findViewById(R.id.textView);
// Typeface typeface=Typeface.createFromAsset(getActivity().getAssets(),"fonts/Cavorting.otf");
// textView.setTypeface(typeface);
return view;
}
}
Name.java
public class Name {
String textView;
Name(String textView){
this.textView=textView;
}
}
recycler.java
public class Recycler extends Fragment {
private List<Name> names;
RecyclerView rv;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view=inflater.inflate(R.layout.recyclerview,container,false);
rv= (RecyclerView) view.findViewById(R.id.rv);
String[] eArray=getActivity().getResources().getStringArray(R.array.english_names);
LinearLayoutManager llm=new LinearLayoutManager(getActivity());
rv.setLayoutManager(llm);
rv.setHasFixedSize(true);
initializeData();
initializeAdapter();
return view;
}
private void initializeAdapter() {
rvadapter adapter=new rvadapter(names);
rv.setAdapter(adapter);
}
public void initializeData() {
names=new ArrayList<>();
names.add(new Name("Anish"));
names.add(new Name(eArray));
}
}
rvadapter.java
public class rvadapter extends RecyclerView.Adapter<rvadapter.NameViewHolder> {
public static class NameViewHolder extends RecyclerView.ViewHolder{
CardView cv;
TextView textView;
public NameViewHolder(View itemView) {
super(itemView);
cv= (CardView) itemView.findViewById(R.id.cardview);
textView= (TextView) itemView.findViewById(R.id.textView);
}
}
List<Name> names;
public rvadapter(List<Name> names) {
this.names=names;
}
#Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
#Override
public NameViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v= LayoutInflater.from(parent.getContext()).inflate(R.layout.card_view,parent,false);
NameViewHolder nvh=new NameViewHolder(v);
return nvh;
}
#Override
public void onBindViewHolder(NameViewHolder holder, int position) {
holder.textView.setText(names.get(position).textView);
}
#Override
public int getItemCount() {
return names.size();
}
}
Please also take a look at my cardview.java where i put commented, that font also doesn't change. I put font inside assets then font folder. This is my second question in stackoverflow but my first question was as not answered correctly, if you can please take a look at that toClick here to to look by another problem too. Thanks in Advance!!

for (int i = 0; i < eArray.length; i++) {
names.add(new Name(eArray[i]));
}

Only one item displaying in recycler view

I am having problems displaying all the items in my recyclerview. My code only shows one item (Home. I have 3 items: Home, Browse Photos and My Travels)
fragment_navigation_drawer.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/fragment_navigation_drawer"
android:background="#EEE"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.traveldiaries.ztir.traveldiaries.NavigationDrawerFragment">
<!-- TODO: Update blank fragment layout -->
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="220dp"
android:background="#16a085"
android:id="#+id/linearLayout">
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/drawerList"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
RecyclerAdapter.java
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.MyViewHolder> {
private LayoutInflater inflater;
List<MenuList> data = Collections.emptyList();
public RecyclerAdapter(Context context, List<MenuList> data){
inflater= LayoutInflater.from(context);
this.data = data;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view=inflater.inflate(R.layout.itemlist,parent,false);
MyViewHolder holder= new MyViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
MenuList current=data.get(position);
holder.title.setText(current.title);
holder.image.setImageResource(current.icon);
}
#Override
public int getItemCount() {
return data.size();
}
class MyViewHolder extends RecyclerView.ViewHolder{
TextView title;
ImageView image;
public MyViewHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.item_list);
image = (ImageView) itemView.findViewById(R.id.icons);
}
}
}
NavigationDrawerFragment.java (posted code only related to recyclerview)
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View layout = inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
recyclerView = (RecyclerView) layout.findViewById(R.id.drawerList);
adapter = new RecyclerAdapter(getActivity(),getData());
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return layout;
}
public static List<MenuList> getData(){
List<MenuList> data = new ArrayList<>();
String[] titles={"Home","My Travels","Browse Photos"};
int[] icons ={R.drawable.home,R.drawable.sunglasses,R.drawable.tooltip_image};
for(int i=0;i<3;i++){
MenuList current = new MenuList();
current.title=titles[i];
current.icon=icons[i];
Log.d("Data",titles[i]);
Log.d("Data",""+icons[i]);
data.add(current);
}
return data;
}
itemlist.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:padding="8dp"
android:id="#+id/icons"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_menu_camera"
android:layout_gravity="center_vertical"
/>
<TextView
android:id="#+id/item_list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Dummy Text"
android:layout_gravity="center_vertical"
android:padding="8dp"
/>
</LinearLayout>
What I was able to do is to check all the passed data (all seems to be fine). Also tried to change width to wrap content (fragment_navigation_drawer.xml) in both my relative and linear layout but I just lose my background color instead and still only one item appear.

Change height of LinearLayout to wrap_content in itemlist.xml
android:layout_height="wrap_content"

Just change the height of your itemlist from "match_parent" to "wrap_content".

RecyclerView not scrolling to the bottom

I followed the recyclerview guidelines and built one for the app I am making, but it does not scroll to the bottom for some reason. I compared it with google code snippets, as well as other code snippets online and can't see the difference. I have posted a picture and the code I am using. I am using tabs, therefore the recyclerview is populated in a fragment.
What the app looks like:
http://imgur.com/H5uOLFR
the adapter class:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private List<Group> groups;
// 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 class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView groupName;
public TextView groupDate;
public TextView groupLocation;
public TextView className;
public ViewHolder(View v) {
super(v);
groupName = (TextView) v.findViewById(R.id.groupName);
groupDate = (TextView) v.findViewById(R.id.groupDate);
groupLocation = (TextView) v.findViewById(R.id.groupLocation);
className = (TextView) v.findViewById(R.id.className);
}
}
/*
* TODO: finish this method
*/
public void add(int position, String item) {
notifyItemInserted(position);
}
public void remove(String item) {
int position = groups.indexOf(item);
groups.remove(position);
notifyItemRemoved(position);
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(List<Group> groupsList) {
groups = groupsList;
Log.d("TEST", "Number of Groups: " +
Integer.toString(groups.size()));
}
// Create new views (invoked by the layout manager)
#Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.group_view, parent, false);
// set the view's size, margins, paddings and layout parameters
ViewHolder vh = new ViewHolder(v);
return vh;
}
// Replace the contents of a view (invoked by the layout manager)
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
final Group group = groups.get(position);
// holder.groupName.setText(group.getName());
holder.groupName.setText(group.getName());
holder.groupDate.setText(group.getFormattedDate());
holder.groupLocation.setText(group.getLocation());
holder.className.setText(group.getParent().getName());
}
// Return the size of your dataset (invoked by the layout manager)
#Override
public int getItemCount() {
return groups.size();
}
}
The Fragment class:
public class groupsFragment extends Fragment implements GroupLeaver, GroupRetriever {
private RecyclerView rv;
private List<Group> groups;
private ProgressDialog progressDialog;
#Override
public void onCreate(Bundle savedInstance){
super.onCreate(savedInstance);
Log.d("TEST", "Entered onCreate");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
AppMain.getController().retrieveGroups(groupsFragment.this);
Log.d("TEST", "Entered onCreateView");
View rootView = inflater.inflate(R.layout.groups_fragment, container, false);
rv = (RecyclerView) rootView.findViewById(R.id.recyclerView);
rv.setLayoutManager(new LinearLayoutManager(getActivity()));
Log.d("TEST", "Size of LIST: " + Integer.toString(groups.size()));
MyAdapter adapter = new MyAdapter(groups);
rv.setAdapter(adapter);
return rootView;
}
#Override
public void onMyGroupsFound(List<Group> groups) {
Log.d("TEST", "Entered onMyGroupsFound");
Logg.info(this.getClass(), "Found %d groups for member %s", groups.size(), User.getCurrentUser().getDisplayName());
this.groups = groups;
}
#Override
public void onGroupLeft(Group oldGroup) {
}
#Override
public void onGroupLeftFailed(Group group, ParseException e) {
}
}
The xml layout for the recyclerview:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="#null"/>
</FrameLayout>
The xml layout for the recyclerview items:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="16dp"
android:orientation="horizontal">
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="3"
android:orientation="vertical">
<TextView
android:id="#+id/groupName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Group Name"
/>
<TextView
android:id="#+id/groupDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Group Date"
/>
<TextView
android:id="#+id/groupLocation"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Group Location"
/>
</LinearLayout>
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="0dp"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="#+id/className"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="right"
android:text="Class Name"
/>
</LinearLayout>
</LinearLayout>
</FrameLayout>

You can use these lines to scroll recyclerview to:
list.add(0, group);
adapter.notifyItemInserted(0);
recyclerview.scrollToPosition(0);

Thanks to everyone who responded, but turns out the problem was the version of RecyclerView I was compiling.
Previously I was compiling this
compile 'com.android.support:recyclerview-v7:22.0.0'
But I changed it to this and it worked
compile 'com.android.support:recyclerview-v7:22.2.0'
Credits to #roi divon for the answer: CoordinatorLayout with RecyclerView & CollapsingToolbarLayout

Maybe adding these lines to the recyclerView will do:
android:scrollbarAlwaysDrawVerticalTrack="true"
android:scrollbars="vertical"
This is my recyclerView which is working:
<android.support.v7.widget.RecyclerView
android:id="#+id/menuRecycler"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbarAlwaysDrawVerticalTrack="true"
android:scrollbars="vertical"/>

I am not sure but I think problem might be Framelayout You can try with Linearlayout instead of Framelayout in your xml layout for the recyclerview items

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

adapter for recyclerview in android - android

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