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Dynamic ListView With EditTexts Android

I have a ListView in my Android application that uses a CustomAdapterClass. The ListView is populated with rows that contain 2 Edit Texts per row. This is fine, the problem I'm having is the ListView is dynamic, i.e. I have added a button that will append on a new row by calling notifyDataSetChanged(); however this clears the whole list.
How can I keep the text that has been entered into the EditTexts when a new row is appended? Code below:
Activity.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"
android:layout_width="match_parent" android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="afterDescendants"
android:id="#+id/listViewAddPeople">
</ListView>
<android.support.design.widget.FloatingActionButton
android:id="#+id/fabAddPerson"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:src="#mipmap/ic_launcher"
app:backgroundTint="#FFFFFF"
android:elevation="6dp"
/>
</RelativeLayout>
Row.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res
/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/personNameEditText"
android:hint="Enter Persons Full Name"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/personPhoneNoEditText"
android:layout_below="#+id/personNameEditText"
android:hint="Enter Phone No. (Optional)"/>
</RelativeLayout>
Java Class:
public class AddPeopleNewProcedureActivity extends AppCompatActivity {
private ListView addPeopleListView;
private CustomAdapterClass customAdapter;
private FloatingActionButton fab;
private int lineCount;
private EditText personsNameET;
private EditText personsPhoneET;
private List<String> personsName;
private List<String> personsPhone;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.addpeoplenew_activity);
setupActivityReferences();
inflateListView();
setupClickListeners();
}
private void setupClickListeners() {
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
lineCount = lineCount +1;
personsName.clear();
personsPhone.clear();
customAdapter.notifyDataSetChanged();
}
});
}
private void inflateListView() {
customAdapter = new CustomAdapterClass();
addPeopleListView.setAdapter(customAdapter);
}
private void setupActivityReferences() {
addPeopleListView = (ListView) findViewById(R.id.listViewAddPeople);
fab = findViewById(R.id.fabAddPerson);
personsNameET = (EditText) findViewById(R.id.personNameEditText);
personsPhoneET = (EditText) findViewById(R.id.personPhoneNoEditText);
lineCount = 1;
}
public class CustomAdapterClass extends BaseAdapter {
#Override
public int getCount() {
return lineCount;
}
#Override
public Object getItem(int i) {
return null;
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
view =
getLayoutInflater().inflate(R.layout.row_addpersonnew,null);
final int rowClicked = i;
return view;
}
}
}
Any help is appreciated!

I have added a button that will append on a new row by calling
notifyDataSetChanged();
I can't see any append actions when someone clicks that button. I see that you clear both of your lists, personsName and personsPhone and after that you notify your adapter that those lists are empty.
Write what really want to be done inside the onClick().

RecyclerView's height 'match_parent' not working as expected whereas fixed height (1000dp,2000dp) is working

I'm working to make a cool layout like this:
For this I'm using Android Parallax library from Github.
This library is creating all the views (as shown in picture) from xml itself.
But I want to create my own recyclerview, create adpaters, model classes and show them with cardview.
I tried using cardview and recyclerview.
Problem:
When I put RecyclerView's height as match_parent (android:layout_height="match_parent"), it gives UI like this:
Only first cardview is display with half part only. Other cardviews are overlapped somehow.
But when I give its height with fixed height like (1000dp, 2000dp), it shows the UI as expected (as shown in first figure). I think it is not a good solution to give its height fixed since data items may differ.
I don't understand what is wrong with my code. Please do suggest some solutions on this.
Following is my different views with my code.
activity_main.xml
<com.github.florent37.parallax.ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:layout_width="match_parent"
android:layout_height="200dp"
android:scaleType="centerCrop"
android:src="#drawable/background"
android:tag="parallax=0.3" />
<TextView
style="#style/MyTitle"
android:layout_width="match_parent"
android:layout_height="160dp"
android:gravity="center"
android:tag="parallax=0.5"
android:text="My awesome title" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="150dp"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical" />
</LinearLayout>
</FrameLayout>
</com.github.florent37.parallax.ScrollView>
card_view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.v7.widget.CardView
android:id="#+id/card_view"
android:layout_width="fill_parent"
android:layout_height="100dp"
android:layout_gravity="center"
android:layout_margin="5dp"
card_view:cardCornerRadius="2dp"
card_view:contentPadding="10dp">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="Hello"
android:textStyle="bold" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/textView"
android:layout_marginTop="10dp"
android:text="world" />
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
My Adapter class is like this:
public class MyRecyclerViewAdapter extends RecyclerView
.Adapter<MyRecyclerViewAdapter
.DataObjectHolder> {
private ArrayList<ContactsModel> mDataset;
private static MyClickListener myClickListener;
public static class DataObjectHolder extends RecyclerView.ViewHolder
implements View
.OnClickListener {
TextView label;
TextView dateTime;
public DataObjectHolder(View itemView) {
super(itemView);
label = (TextView) itemView.findViewById(R.id.textView);
dateTime = (TextView) itemView.findViewById(R.id.textView2);
itemView.setOnClickListener(this);
}
#Override
public void onClick(View v) {
//myClickListener.onItemClick(getAdapterPosition(), v);
}
}
public void setOnItemClickListener(MyClickListener myClickListener) {
this.myClickListener = myClickListener;
}
public MyRecyclerViewAdapter(ArrayList<ContactsModel> myDataset) {
mDataset = myDataset;
}
#Override
public DataObjectHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_view, parent, false);
DataObjectHolder dataObjectHolder = new DataObjectHolder(view);
return dataObjectHolder;
}
#Override
public void onBindViewHolder(DataObjectHolder holder, int position) {
holder.label.setText(mDataset.get(position).getmText1());
holder.dateTime.setText(mDataset.get(position).getmText2());
}
public void addItem(ContactsModel dataObj, int index) {
mDataset.add(index, dataObj);
notifyItemInserted(index);
}
public void deleteItem(int index) {
mDataset.remove(index);
notifyItemRemoved(index);
}
#Override
public int getItemCount() {
return mDataset.size();
}
public interface MyClickListener {
public void onItemClick(int position, View v);
}
}
In MainActivity, I have written code like this:
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new MyRecyclerViewAdapter(getDataSet());
mRecyclerView.setAdapter(mAdapter);
Fabric.with(this, new Crashlytics());
}
private ArrayList<ContactsModel> getDataSet() {
ArrayList results = new ArrayList<ContactsModel>();
for (int index = 0; index < 20; index++) {
ContactsModel obj = new ContactsModel("Some Primary Text " + index,
"Secondary " + index);
results.add(index, obj);
}
return results;
}
}
Model class is like:
public class ContactsModel {
private String mText1;
private String mText2;
ContactsModel (String text1, String text2){
mText1 = text1;
mText2 = text2;
}
public String getmText1() {
return mText1;
}
public void setmText1(String mText1) {
this.mText1 = mText1;
}
public String getmText2() {
return mText2;
}
public void setmText2(String mText2) {
this.mText2 = mText2;
}
}
Apologies for the very long bulk of code.
Thanks!

You have a RecyclerView (which is scrollable) within a Scrollable Layout.
Replace your ScrollView tag with "android.support.v4.widget.NestedScrollView". This will allow the RecyclerView to properly expand.
<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.support.v7.widget.RecyclerView
android:id="#+id/my_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical" />
</android.support.v4.widget.NestedScrollView>

After Replaceing your ScrollView with NestedScrollView you can just add this line into the NestedScrollView
android:fillViewport="true"

I was having a same problem in my NestedScrollView.
Just added one line inside NestedScrollView and my problem solved.
android:fillViewport="true"

ImageView Slider horizontally

I am trying to create a horizontal slider of images fitted in my imageview in my main layout file. But instead of imageview sliding on touch, the code is moving the whole layout horizontally.
Following is my Java code for sliding:
public class Artprofile extends FragmentActivity {
static final int NUM_ITEMS = 5;
ImageFragmentPagerAdapter imageFragmentPagerAdapter;
ViewPager viewPager;
public static final String[] IMAGE_NAME = {"a", "b", "c", "d", "e",};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_page);
imageFragmentPagerAdapter = new ImageFragmentPagerAdapter(getSupportFragmentManager());
viewPager = (ViewPager) findViewById(R.id.pager);
viewPager.setAdapter(imageFragmentPagerAdapter);
}
public static class ImageFragmentPagerAdapter extends FragmentPagerAdapter {
public ImageFragmentPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getCount() {
return NUM_ITEMS;
}
#Override
public Fragment getItem(int position) {
SwipeFragment fragment = new SwipeFragment();
return SwipeFragment.newInstance(position);
}
}
public static class SwipeFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View swipeView = inflater.inflate(R.layout.layoutart, container, false);
ImageView imageView = (ImageView) swipeView.findViewById(R.id.image_view1);
Bundle bundle = getArguments();
int position = bundle.getInt("position");
String imageFileName = IMAGE_NAME[position];
int imgResId = getResources().getIdentifier(imageFileName, "drawable", "com.example.user.myapplication1");
imageView.setImageResource(imgResId);
return swipeView;
}
static SwipeFragment newInstance(int position) {
SwipeFragment swipeFragment = new SwipeFragment();
Bundle bundle = new Bundle();
bundle.putInt("position", position);
swipeFragment.setArguments(bundle);
return swipeFragment;
}
}
}
Following is my main layout file:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:background="#drawable/mobileback"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<ImageView android:id="#+id/image_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:maxWidth="150dp"
android:maxHeight="150dp"
android:scaleType="fitCenter"
android:layout_marginRight="50dp"
android:layout_marginTop="30dp"
android:layout_marginLeft="400dp"
android:src="#drawable/profilewindow1"
android:layout_marginEnd="58dp"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true" />
<FrameLayout
android:layout_width="match_parent"
android:layout_height="330dp"
android:layout_alignParentStart="true"
android:maxWidth="150dp"
android:maxHeight="150dp"
android:layout_below="#+id/image_view"
android:id="#+id/layout_mobile1">
<ImageView
android:id="#+id/image_view1"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
</FrameLayout>
</RelativeLayout>
And this is the Fragment layout used for sliding:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
I dont understand the problem. Kindly help. Thanks in advance

You can use a layout to wrap imageview and then wrap the layout in horizontal scrollview

Setting listeners on buttons in a ListView populated by a CursorAdapter from a Fragment

Although a developer for more years than I can remember I'm new to Java/Android and the whole OOP thing... Yes we do still exist... shambling relics of a more sequential age...!!
Anyway I have a fragment which invokes a CursorAdapter to populate a ListView.
The ListView has several TextViews and two buttons on each row.
I have been trying to set up listeners on each of the buttons so far without success...
I've searched this forum (and others) and I've used several bits of code suggested by contributors..
From my research my biggest problem seems to be that I'm doing all this from a Fragment.
My question is how do I pass the base ListView id from the Fragment to the Adapter...???
My ListView Child XML...
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="60dp">
<TextView
android:layout_marginTop="#dimen/textViewMarginTop"
android:layout_marginRight="#dimen/textViewMarginRight"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:text="12345678"
android:id="#+id/job_id"
/>
<TextView
android:layout_marginTop="#dimen/textViewMarginTop"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="abcdef"
android:id="#+id/from_location"
android:layout_toRightOf="#+id/job_id"
/>
<TextView
android:layout_marginTop="#dimen/textViewMarginTop"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="Blanchardstown"
android:id="#+id/to_location"
android:layout_toRightOf="#+id/from_location"
/>
<Button
android:layout_width="50dp"
android:layout_height="wrap_content"
android:id="#+id/job_bid"
android:text="#string/joblist_bid"
android:layout_below="#+id/job_id"
android:layout_toLeftOf="#+id/job_details"
/>
<Button
android:layout_width="80dp"
android:layout_height="wrap_content"
android:id="#+id/job_details"
android:text="#string/joblist_details"
android:layout_below="#+id/to_location"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
/>
</RelativeLayout>
My ListView Parent XML
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="60dp">
<TextView
android:layout_marginTop="#dimen/textViewMarginTop"
android:layout_marginRight="#dimen/textViewMarginRight"
android:layout_width="70dp"
android:layout_height="wrap_content"
android:text="12345678"
android:id="#+id/job_id"
/>
<TextView
android:layout_marginTop="#dimen/textViewMarginTop"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="abcdef"
android:id="#+id/from_location"
android:layout_toRightOf="#+id/job_id"
/>
<TextView
android:layout_marginTop="#dimen/textViewMarginTop"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="Blanchardstown"
android:id="#+id/to_location"
android:layout_toRightOf="#+id/from_location"
/>
<Button
android:layout_width="50dp"
android:layout_height="wrap_content"
android:id="#+id/job_bid"
android:text="#string/joblist_bid"
android:layout_below="#+id/job_id"
android:layout_toLeftOf="#+id/job_details"
/>
<Button
android:layout_width="80dp"
android:layout_height="wrap_content"
android:id="#+id/job_details"
android:text="#string/joblist_details"
android:layout_below="#+id/to_location"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
/>
</RelativeLayout>
My Fragment Code
public class jobListFragment extends ListFragment
{
private final String m_LogcatTag = "assignment5";
public ListView m_jobListView;
public JobDataAdpter m_jobDataAdapter;
JobsDataSource m_datasource;
private SQLiteDatabase m_database;
CursorAdapter m_cursoradaptor;
public View m_jobListFragmentBaseView;
Cursor m_cursor;
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
super.onCreateView(inflater, container, savedInstanceState);
m_jobListFragmentBaseView = inflater.inflate(layout.joblistfragment, container, false);
ListView m_jobListView = (ListView)m_jobListFragmentBaseView.findViewById(android.R.id.list);
//Declare an object to handle database I-O and open a channel to the database
m_datasource = new JobsDataSource (getActivity().getApplicationContext());
m_datasource.open();
m_cursor = m_datasource.getAllJobs();
m_jobDataAdapter = new JobDataAdpter(getActivity().getApplicationContext(), m_cursor, 0);
m_jobListView.setAdapter(m_jobDataAdapter);
return m_jobListFragmentBaseView;
}
My Adapter Code
public class JobDataAdpter extends CursorAdapter
{
private final String mLogcatTag = "assignment5";
protected ListView mListView; THIS IS THE VARIABLE IN QUESTION
public JobDataAdpter(Context context, Cursor cursor, int flags )
{
super(context, cursor, 0);
}
protected static class RowViewHolder
{
public TextView m_job_bid;
public TextView m_job_details;
}
//End New Code\
#Override
public View newView(Context context, Cursor cursor, ViewGroup parent)
{
View view = View.inflate(context, R.layout.jobslistlayout, null);
RowViewHolder holder = new RowViewHolder();
holder.m_job_bid = (TextView) view.findViewById(R.id.job_bid);
holder.m_job_details = (TextView) view.findViewById(R.id.job_details);
holder.m_job_bid.setOnClickListener(m_OnBidClickListener);
holder.m_job_details.setOnClickListener(m_OnDetailsClickListener);
view.setTag(holder);
return view;
}
#Override
public void bindView(View view, Context context, Cursor cursor)
{
TextView m_job_IdView = (TextView) view.findViewById(R.id.job_id);
TextView m_from_LocationView = (TextView) view.findViewById(R.id.from_location);
TextView m_to_LocationView = (TextView) view.findViewById(R.id.to_location);
// Extract properties from cursor
long row_id = cursor.getLong((cursor.getColumnIndexOrThrow(MySQLiteOpenHelper.m_COLUMN_ID)));
String m_job_id = cursor.getString(cursor.getColumnIndexOrThrow(MySQLiteOpenHelper.m_COLUMN_JOB_ID));
String m_From_Location = cursor.getString(cursor.getColumnIndexOrThrow(MySQLiteOpenHelper.m_COLUMN_JOB_FROM_LOCATION));
String m_To_Location = cursor.getString(cursor.getColumnIndexOrThrow(MySQLiteOpenHelper.m_COLUMN_JOB_TO_LOCATION));
// Populate fields with extracted properties
m_job_IdView.setText(m_job_id);
m_from_LocationView.setText(String.valueOf(m_From_Location));
m_to_LocationView.setText(String.valueOf(m_To_Location));
}
private View.OnClickListener m_OnBidClickListener = new View.OnClickListener()
{
#Override
public void onClick(View v)
{ HERE IS WHERE THE VARIABLE IS USED
final int position = mListView.getPositionForView((View) v.getParent());
Log.v(mLogcatTag, "Title clicked, row %d" + position);
}
};
private View.OnClickListener m_OnDetailsClickListener = new View.OnClickListener()
{
#Override
public void onClick(View v)
{
final int position = mListView.getPositionForView((View) v.getParent());
Log.v(mLogcatTag, "Text clicked, row %d" + position);
}
};
}
OK guys .....That's it.... Hope you can help

Why is my RecyclerView not showing anything? / What happend if Recycler Adapter is set again after notifyDataSetChanged() called?

I am new to Android Programming and I've been trying to make a fragment which displays a list of items using RecyclerView. Everything seems fine and there is no error when I run the app.
Here is my code:
FriendsFragment.java
public class FriendsFragment extends android.support.v4.app.Fragment {
#Bind(R.id.friendList)
RecyclerView friendList;
RecyclerView.LayoutManager friendsManager;
FriendListAdapter friendListAdapter;
public FriendsFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_friends, container, false);
ButterKnife.bind(this, view);
return view;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
friendList.setHasFixedSize(true);
friendsManager = new LinearLayoutManager(view.getContext());
friendList.setLayoutManager(friendsManager);
friendListAdapter = new FriendListAdapter(new ArrayList<Friends>());
friendList.setAdapter(friendListAdapter);
test();
friendListAdapter.notifyDataSetChanged();
friendList.setAdapter(friendListAdapter);
super.onViewCreated(view, savedInstanceState);
}
private void test() {
Friends friend = new Friends();
friend.setName("Junjie Saitamaria");
friendListAdapter.addNewFriend(friend);
}
}
FriendListAdapter.java
public class FriendListAdapter extends RecyclerView.Adapter<FriendListAdapter.ViewHolderFriend> {
private List<Friends> friendList;
public FriendListAdapter(List<Friends> friends) {
if(friends != null) {
friendList = friends;
}
}
public void addNewFriend(Friends friend) {
friendList.add(0, friend);
}
#Override
public ViewHolderFriend onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_item_friend, parent, false);
ViewHolderFriend viewHolder = new ViewHolderFriend(view);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolderFriend holder, int position) {
Friends currentFriend = friendList.get(position);
holder.friendName.setText(currentFriend.getName());
}
#Override
public int getItemCount() {
return friendList.size();
}
static class ViewHolderFriend extends RecyclerView.ViewHolder {
#Bind(R.id.friend_avatar)
public ImageView friendThumbnail;
#Bind(R.id.friend_name)
public TextView friendName;
Context currentContext = null;
public ViewHolderFriend(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
this.currentContext = itemView.getContext();
}
}
}
fragment_friends.xml
<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"
android:layout_margin="10dp"
tools:context="com.cebuinstituteoftechnology_university.citumessenger.FriendsFragment">
<android.support.v7.widget.RecyclerView
android:id="#+id/friendList"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true" >
</android.support.v7.widget.RecyclerView>
</RelativeLayout>
list_item_friend.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
android:layout_width="match_parent"
android:layout_height="80dp"
android:id="#+id/friends_card"
android:elevation="2dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- icon -->
<ImageView
android:id="#+id/friend_avatar"
android:layout_width="64dp"
android:layout_height="64dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginTop="1dp"
android:layout_marginBottom="1dp"
android:contentDescription="icon"
android:src="#drawable/avatar"
/>
<!-- title -->
<TextView
android:id="#+id/friend_name"
android:layout_width= "wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_toRightOf="#+id/friend_avatar"
android:layout_alignBaseline="#+id/friend_avatar"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
android:text="Name" />
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>

Looks everything fine except this extra line friendList.setAdapter(friendListAdapter); in below code:
friendList.setAdapter(friendListAdapter);
test();
friendListAdapter.notifyDataSetChanged();
friendList.setAdapter(friendListAdapter);
Replace above 3 lines with this and see :
friendList.setAdapter(friendListAdapter);
test();
friendListAdapter.notifyDataSetChanged();

Remove following line from onViewCreated() Method
friendList.setAdapter(friendListAdapter);
other code is fine.