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RecyclerAdapter set adapter position

By : ma12
Date : October 17 2020, 01:08 AM
wish helps you The solution to this issue is the developer had multiple search designs in the DBHelper each being triggered by different buttons on the search Activity this design in the DBHelper lead to multiple ArrayLists all with the same name this drove the RecycleAdapter crazy as it is bound to ArrayList so OLD Mr. Boolean to the rescue! Here is the revised design code features In the Search Activity declare public static Boolean use = false; and Import where needed import static com..MainActivity.use;
Here is the code for each search button
code :
    public void findAllData(View view){
    helper = new DBHelper(this);
    use = false;
    // Set Mr. Boolean
    Intent intent = new Intent( MainActivity.this, ListActivity.class );
    // ListActivity shows Results of the Search
    startActivity( intent );

public void findSelect(View v){
    selectSTRING = etFromDate.getText().toString();
    // Get your Search variable
    helper = new DBHelper(this);
    use = true;
    Intent intent = new Intent( MainActivity.this, ListActivity.class );
    startActivity( intent );
    /* Retrive ALL data from database table named "TABLE_INFO" */
public List<DBModel> getDataFromDB(){
    //String query = "SELECT * FROM " + TABLE_INFO + " WHERE " + Col_PURCHASE_DATE + " > 0 " + " ORDER BY " + Col_ID + " DESC ";
    /* Notice the SPACES before AND after the words WHERE ORDER BY ASC or DESC most of all the condition " > 0 "*/
    /* =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=*/
   Cursor cursor = null;
    List<DBModel> modelList = new ArrayList<>();
    if(use == true){
        String query = "SELECT * FROM " + TABLE_INFO + " WHERE " + Col_PURCHASE_DATE + " ='" + selectSTRING + "'";
        db = this.getWritableDatabase();
        cursor = db.rawQuery(query,null);
    if(use == false){
        String query = "SELECT * FROM " + TABLE_INFO;
        db = this.getWritableDatabase();
        cursor = db.rawQuery(query,null);

    if (cursor.moveToFirst()){

        do {
            DBModel model = new DBModel();

            int sz = modelList.size();
            int out =   model.setRowid(cursor.getInt(0));
            String out1 =  model.setStation_Name(cursor.getString(1));
            String out2 =  model.setDate_of_Purchase(cursor.getString(2));
            String out3 = model.setGas_Cost(cursor.getString(3));
            System.out.println("==============getDataFromDB ID "+out);
            System.out.println("==============getDataFromDB Station "+out1);
            System.out.println("==============getDataFromDB Date "+out2);
            System.out.println("==============getDataFromDB Cost "+out3);
            System.out.println("======= ======getDataFromDB SIZE "+sz);

        }while (cursor.moveToNext());
    return modelList;

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Get position from List Adapter

By : Kamlesh Joshi
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Use ArrayAdapter.getPosition(item) to get position of an item.

getting null value in position adapter

By : Umesh Kamboj
Date : March 29 2020, 07:55 AM
seems to work fine I need to fix this code Objects item = getItem(position); can you please help tell me why I am having getting null here its showing the result null , Instead of
code :

How to get position and display data in detail activity using recycleradapter and firebase

By : Bags
Date : March 29 2020, 07:55 AM
this will help The best way to implement the onClick action in your adapter is to create an interface in your adapter and link it to your fragment by making it implement such interface, and then in the fragment you launch the new activity. I've refactored your adapter as such:
code :
public class SpecialAdapter extends RecyclerView.Adapter<SpecialAdapter.SpecialViewHolder> {

    List<ListItem> items;
    OnItemClickListener callback;

    public SpecialAdapter(List<ListItem> items, OnItemClickListener callback) {
        this.items = items;
        this.callback = callback;

    public SpecialViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.category_item_tile, parent, false);
        return new SpecialViewHolder(view);

    public void onBindViewHolder(@NonNull SpecialViewHolder holder, int position) {
        ListItem listItem = items.get(position);

    public int getItemCount() {
        return items.size();

    class SpecialViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

        public TextView username;
        public ImageView imageUrl;

        public SpecialViewHolder(View itemView) {

            username = itemView.findViewById(R.id.list_title);
            imageUrl = itemView.findViewById(R.id.list_avatar);


        public void onClick(View v) {

    public interface OnItemClickListener {
        void onItemClick(int pos);
public class CategoryFragment extends Fragment implements SpecialAdapter.OnItemClickListener {
    private static final String TAG = "CategoryFragment";

    private RecyclerView recyclerView;
    private SpecialAdapter adapter;
    // private Adapter adapter;
    private List<ListItem> listItems;
    private FirebaseDatabase mFirebaseDatabase;
    private DatabaseReference myRef;

    private AdapterView.OnItemSelectedListener listener;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView =inflater.inflate(R.layout.recycler_view,container,false);
        listItems = new ArrayList<>();
        adapter = new SpecialAdapter(listItems, this);
        mFirebaseDatabase = FirebaseDatabase.getInstance();
        progressBar = rootView.findViewById(R.id.progressBar);
        recyclerView = rootView.findViewById(R.id.my_recycler_view);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        int tilePadding = getResources().getDimensionPixelSize(R.dimen.tile_padding);
        recyclerView.setPadding(tilePadding, tilePadding, tilePadding, tilePadding);
        recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), 2));
        return recyclerView;

        //return rootView


    private void getFirebaseData() {

        myRef = mFirebaseDatabase.getReference("Users");
        myRef.addChildEventListener(new ChildEventListener() {
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                ListItem data = dataSnapshot.getValue(ListItem.class);


            public void onChildChanged(DataSnapshot dataSnapshot, String s) {


            public void onChildRemoved(DataSnapshot dataSnapshot) {


            public void onChildMoved(DataSnapshot dataSnapshot, String s) {


            public void onCancelled(DatabaseError databaseError) {


    public void onItemClick(int pos) {

        Intent pDetail = new Intent(this.getContext(), ProfileDetail.class);

        ListItem item = listItems.get(pos);
        pDetail.putExtra(ProfileDetail.EXTRA_POSITION, item.getUserid());
public class ListItem {

    private String details;
    private String imageurl;
    private String status;
    private String summary;
    private String userid;
    private String username;

    public String getDetails() {
        return details;

    public void setDetails(String details) {
        this.details = details;

    public String getImageurl() {
        return imageurl;

    public void setImageurl(String imageurl) {
        this.imageurl = imageurl;

    public String getStatus() {
        return status;

    public void setStatus(String status) {
        this.status = status;

    public String getSummary() {
        return summary;

    public void setSummary(String summary) {
        this.summary = summary;

    public String getUserid() {
        return userid;

    public void setUserid(String userid) {
        this.userid = userid;

    public String getUsername() {
        return username;

    public void setUsername(String username) {
        this.username = username;
public class ProfileDetail extends AppCompatActivity {
    private static final String TAG = "EXTRA_POSITION";
    public static final String EXTRA_POSITION = "profile_detail";
    private List<ListItem> listItems;
    private FirebaseDatabase mFirebaseDatabase;
    private DatabaseReference myRef;
    private TextView tvName, tvSummary, tvStatus, tvDetail;
    private ImageView ivImage;
    private ImageView ivImageCard;

    public void onCreate(Bundle savedInstanceState) {
        listItems = new ArrayList<>();
        ivImage = findViewById(R.id.userAvatar);
        ivImageCard = findViewById(R.id.header_img);
        tvName = findViewById(R.id.userProfileName);
        tvSummary = findViewById(R.id.ProfileSummary);
        tvStatus = findViewById(R.id.userStatus);
        tvDetail = findViewById(R.id.ProfileDetail);

        String userid = getIntent().getExtras().getString(ProfileDetail.EXTRA_POSITION);
        mFirebaseDatabase = FirebaseDatabase.getInstance();
        myRef = mFirebaseDatabase.getReference("Users");
        myRef.child(userid).addListenerForSingleValueEvent(new ValueEventListener() {
            public void onDataChange(DataSnapshot dataSnapshot) {
                ListItem item = (ListItem) dataSnapshot.getValue(ListItem.class);


            public void onCancelled(FirebaseError firebaseError) {




How do I get the position from a spinner adapter?

By : Dinesh
Date : March 29 2020, 07:55 AM
like below fixes the issue I am filling a spinner with a generic ArrayList of cat Category type. , Use setOnItemSelectedListener like this

RecyclerView.Adapter<RecyclerAdapter.ViewHolder> confusion

By : Maksym
Date : March 29 2020, 07:55 AM
wish helps you I have been learning how to use RecyclerView in android studio. I came across a class extending "RecyclerView.Adapter < RecyclerAdapter.ViewHolder >". What is RecyclerAdapter.ViewHolder and why is it inside the brackets? , View holder objects:
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