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How to setOnClickListener in adapter using RecyclerView to display inside fragment

I cannot access the ID of the item to view it in ToastMessage, or even store it in the database (use Room DataBase)
I have tried but the message does not appear
I need the reference ID to use for database storage and complete the process for storing the shopping cart
itemAdapter.java
public class itemAdapter extends RecyclerView.Adapter<itemAdapter.ItemViewHolder> {
private Context context;
private ArrayList<Items> arrayList;
private AdapterView.OnItemClickListener listener;
public itemAdapter(Context context, ArrayList<Items> arrayList) {
this.context = context;
this.arrayList = arrayList;
}
#NonNull
#Override
public ItemViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(context).inflate(R.layout.item, parent, false);
return new ItemViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull ItemViewHolder holder, int position) {
holder.name.setText(arrayList.get(position).getItemName());
holder.desc.setText(arrayList.get(position).getItemDesc());
holder.price.setText(arrayList.get(position).getItemPrice());
holder.add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context,arrayList.get(position).getItemIid(),Toast.LENGTH_SHORT);
}
});
holder.name.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context,arrayList.get(position).getItemPrice(),Toast.LENGTH_SHORT);
}
});
}
#Override
public int getItemCount() {
return arrayList.size();
}
class ItemViewHolder extends RecyclerView.ViewHolder {
TextView name, desc, price;
ImageView remove, add;
public ItemViewHolder(#NonNull View itemView) {
super(itemView);
name = itemView.findViewById(R.id.tvName);
desc = itemView.findViewById(R.id.tvDesc);
price = itemView.findViewById(R.id.tvPrice);
remove = itemView.findViewById(R.id.btnDelete);
add = itemView.findViewById(R.id.btnAdd);
}
}
}
MealsFragment.java
public class MealsFragment extends Fragment {
public MealsFragment() {
// Required empty public constructor
}
RecyclerView recyclerView;
itemAdapter adapter;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_meals, container, false);
}
#Override
public void onViewCreated( View view, Bundle savedInstanceState) {
ArrayList<Items> ItemsList = (ArrayList<Items>) RoomDatabaseSingleton.getInstance(getContext().getApplicationContext())
.getAppDatabase()
.getDao()
.getItems("meals");
recyclerView = view.findViewById(R.id.rvMeals);
RecyclerView.LayoutManager manager = new LinearLayoutManager(
getContext(), RecyclerView.VERTICAL, false);
recyclerView.setLayoutManager(manager);
adapter = new itemAdapter(getContext(), ItemsList);
recyclerView.setAdapter(adapter);
}
}

Try the following instead
holder.add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context,arrayList.get(position).getItemIid(),Toast.LENGTH_SHORT).show();
}
});
holder.name.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context,arrayList.get(position).getItemPrice(),Toast.LENGTH_SHORT).show();
}
});
The static method makeText of Toast is used to create the Toast object and show() method on the Toast object is used to display the Toast

Button click listener in a separate fragment not working?

I am trying to add a button clicker listener in my fragment but it doesn't seem to work.
My main fragment is created to show tabs of two other fragments. Now, this tabs fragment has a button in the toolbar to filter content. This filter button's listener and method are in my two other fragments. The issue is, when clicking on the button, it does nothing.
Tabs Fragment:
public class LibraryFragment extends Fragment implements ViewPager.OnPageChangeListener {
private View view;
private SectionsPagerAdapterLib PageAdapter;
public ViewPager viewPager;
private ImageView filterBtn;
private LibraryFragment.OnItemClickListener mOnItemClickListener;
public interface OnItemClickListener {
void onItemClick(View view);
}
public void setOnItemClickListener(LibraryFragment.OnItemClickListener mItemClickListener) {
this.mOnItemClickListener = mItemClickListener;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
this.view = inflater.inflate(R.layout.fragment_library_tabs, container, false);
TabLayout tabLayout = view.findViewById(R.id.fav_list_tabs);
filterBtn = view.findViewById(R.id.filterBtn);
viewPager = view.findViewById(R.id.fav_list_tabs_container);
filterBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mOnItemClickListener != null) {
mOnItemClickListener.onItemClick(v);
}
}
});
PageAdapter = new SectionsPagerAdapterLib(getFragmentManager(), getActivity());
viewPager.setAdapter(PageAdapter);
viewPager.setOffscreenPageLimit(2);
viewPager.addOnPageChangeListener(this);
tabLayout.setupWithViewPager(viewPager);
getActivity().getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
getActivity().getWindow().setStatusBarColor(getActivity().getResources().getColor(R.color.mWindowColorHeaders));
return view;
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
Fragment fragment = PageAdapter.getFragment(position);
if (fragment != null) {
fragment.onResume();
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
}
Fragment which is supposed to work when the button is clicked:
public class ContentFragment extends Fragment implements LibraryFragment.OnItemClickListener {
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_data, null);
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// find my views, etc
}
#Override
public void onItemClick(View view) {
//populate filter list
if (Constants.genreList != null){
list.add(0, "All Filters");
for (int i = 0; i < Constants.list.size(); i++) {
list.add((i + 1), Constants.list.get(i).getName());
}
}
final String[] listArray = new String[list.size()];
for (int i = 0; i < list.size(); i++) {
listArray[i] = list.get(i);
}
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Select Filter");
builder.setItems(genreArray, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
// ((TextView) v).setText(genreArray[i]);
selected_list.setText(listArray[i]);
if (i == 0) {
getData(1);
}
dialogInterface.dismiss();
}
});
builder.show();
}
}
Any help will be appreciated.

try this in a fragment
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{ //change fragment_video to where your button is located//
final View v2 = inflater.inflate(R.layout.fragment_video,container,false);
//start stream Button
Button startButton = (Button)v2.findViewById(R.id.buttonStart);
startButton.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
//what your button is going to do
}
});
return v2;
}

As fragments are handled by Activity ,Fragments are still not depend on each other and can be used in one or two pane mode. Activity should handle listeners of both fragments.

How to make a certain custom listview item, send you to a certain activity?

Here is my Java:
public class Cantos extends AppCompatActivity {
ListView lv;
Context context;
ArrayList cantoList;
public static String[] cantos = {"1: Abre Tu Oido", "2: A Cristo Quiero", "3: Acerquese Mi Clamor", "4: A Cristo Yo Alabare",
"5: Acude Dios", "6: Adelante", "7: A Dios Canto", "8: Adios Para Siempre", "9: Ahora Senor", "10: A Jesucristo Ven",
"11: Alabad A Dios"};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cantos);
initTypeface();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setTitle(null);
toolbar.setNavigationIcon(getDrawable(R.drawable.abc_ic_ab_back_mtrl_am_alpha));
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(Cantos.this, MainMenu.class);
startActivity(i);
}
});
}
private void initTypeface() {
Typeface myTypeface = Typeface.createFromAsset(getAssets(), "fonts/AftaSerifThin-Regular.otf");
TextView text = (TextView) findViewById(R.id.toolbarCantos);
text.setTypeface(myTypeface);
}
}
Here is my other Java with BaseAdapter (Custom ListView):
public class CustomAdapter extends BaseAdapter {
String[] result;
Context context;
private static LayoutInflater inflater = null;
public CustomAdapter(Cantos cantos, String[] cantos1) {
result = cantos1;
context = cantos;
inflater = (LayoutInflater)context.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return result.length;
}
#Override
public Object getItem(int position) {
return position;
}
#Override
public long getItemId(int position) {
return position;
}
public class Holder
{
TextView tv;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder = new Holder();
View rowView;
rowView = inflater.inflate(R.layout.cantos_list, null);
holder.tv = (TextView) rowView.findViewById(R.id.textCanto);
holder.tv.setText(result[position]);
Typeface myFont = Typeface.createFromAsset(context.getAssets(), "fonts/AftaSerifThin-Regular.otf");
holder.tv.setTypeface(myFont);
return rowView;
}
}
How can I make one certain item send me to another certain activity?
Thank you in advance!
P.S sorry if I spam too much! I am nearly done learning some of the basics! I beg you cope with me!

If you want to call another activity on selection of item in list view you can call OnClick listener to textview in custom adapter
Code:
#Override
public View getView(int position, View convertView, ViewGroup parent) {
Holder holder = new Holder();
View rowView;
rowView = inflater.inflate(R.layout.cantos_list, null);
holder.tv = (TextView) rowView.findViewById(R.id.textCanto);
holder.tv.setText(result[position]);
holder.tv.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(context,NewAcivity.class);
((Activity) context).startActivity(intent);
}
});
Typeface myFont = Typeface.createFromAsset(context.getAssets(), "fonts/AftaSerifThin-Regular.otf");
holder.tv.setTypeface(myFont);
return rowView;
}

Use intent.putExtra("key", value) & getExtra() to send the data from one activity to another activity
//try this
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent;
intent = new Intent(CurrentActivity.this, NextActivity.class);
startActivity(intent)
}
});

First set adapter for your listview. then perform onItem click event.
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
displayAnotherListView(position);
}
});
public void displayAnotherListView(int position) {
switch (position) {
case 0: {
Intent i=new Intent(YourActivity.this,Activity_one.class);
startActivity(ii);
break;
}
case 1: {
Intent one=new Intent(YourActivity.this,Activity_two.class);
startActivity(one);
break;
}
case 2: {
Intent two = new Intent(YourActivity.this, Activity_three.class);
startActivity(two);
break;
}
}
}
you can do this for each item, but if you want to pass same intent for all no need to make method finding position, just pass intent on item click.

How to refresh ListView after deleting element?

I have created a listview but when i delete a element, it doesn't refresh. I have tried
adapter.notifyDataSetChanged();
and
getListView().invalidateViews();
in mainactivity:
case R.id.ordini:
Ordini O = new Ordini();
android.app.FragmentManager fragmentManager0 = getFragmentManager();
android.app.FragmentTransaction fragmentTransaction0 = fragmentManager0
.beginTransaction();
fragmentTransaction0.replace(R.id.frame, O);
fragmentTransaction0.commit();
Ordini.java
public class Ordini extends ListFragment implements AdapterView.OnItemClickListener {
int ArraySize;
CustomAdapterOrdini adapter;
private List<RowItemOrdini> rowItems;
Button SendButton;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.ordini, null, false);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
ArraySize = MainActivity.ArrayProdotto.size();
SendButton = (Button) getActivity().findViewById(R.id.send_btn);
rowItems = new ArrayList<RowItemOrdini>();
for (int i = 0; i < ArraySize; i++) {
RowItemOrdini items = new RowItemOrdini(
MainActivity.ArrayProdotto.get(i),
R.drawable.ic_delete_black_24dp,
MainActivity.ArrayCode.get(i),
MainActivity.ArrayPrezzo.get(i),
MainActivity.ArrayColli.get(i),
MainActivity.ArrayQuantita.get(i));
rowItems.add(items);
}
adapter = new CustomAdapterOrdini(getActivity(), rowItems);
setListAdapter(adapter);
getListView().setOnItemClickListener(this);
SendButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getActivity(), "invio ordine in corso... ", Toast.LENGTH_SHORT)
.show();
SendOrdine();
}
});
}
#Override
public void onResume(){
super.onResume();
adapter.notifyDataSetChanged();
getListView().invalidateViews();
}
CustomAdapterOrdini
public class CustomAdapterOrdini extends BaseAdapter {
Context context;
List<RowItemOrdini> rowItem;
ImageView Del;
TextView Colli, Prezzo, Quantita, Code, Product;
CustomAdapterOrdini(Context context, List<RowItemOrdini> rowItem) {
this.context = context;
this.rowItem = rowItem;
}
#Override
public int getCount() {
return rowItem.size();
}
#Override
public Object getItem(int position) {
return rowItem.get(position);
}
#Override
public long getItemId(int position) {
return rowItem.indexOf(getItem(position));
}
#Override
public boolean areAllItemsEnabled() {
return false;
}
#Override
public boolean isEnabled(int position) {
return false;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater mInflater = (LayoutInflater) context
.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.list_ordini, null);
}
Code = (TextView) convertView.findViewById(R.id.prodcode);
Product = (TextView) convertView.findViewById(R.id.PRODOTTO);
Del = (ImageView) convertView.findViewById(R.id.del);
Colli = (TextView) convertView.findViewById(R.id.T1);
Prezzo = (TextView) convertView.findViewById(R.id.T2);
Quantita = (TextView) convertView.findViewById(R.id.T3);
Del.setFocusable(true);
Del.setClickable(true);
Del.setTag(convertView);
final RowItemOrdini row_pos = rowItem.get(position);
// setting the image resource and title
Del.setImageResource(R.drawable.ic_delete_black_24dp);
Product.setText(row_pos.getTitle());
Code.setText(row_pos.getCode());
Colli.setText(row_pos.getColli());
Prezzo.setText(row_pos.getPrezzo());
Quantita.setText(row_pos.getQuantita());
Del.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// HERE I WANT REFRESH MY LISTVIEW
MainActivity.ArrayQuantita.remove(0);
MainActivity.ArrayCode.remove(0);
MainActivity.ArrayProdotto.remove(0);
MainActivity.ArrayColli.remove(0);
MainActivity.ArrayPrezzo.remove(0);
CustomAdapter.ShowDialog("Elemento eliminato con successo!", context);
}
});
return convertView;
}
Can someone help me with listview refresh?
I want refresh my listview in CustomAdapterOrdini or in onResume in Ordini.java.
public void onClick(View v) {
// HERE I WANT REFRESH MY LISTVIEW
There is a simple way?
Thank you so much!

You have declare ArrayProdotto in your MainActivity and you are display your data from rowItem in CustomAdapterOrdini. You have to remove your data from both list and call notifyDataSetChanged();
Like as below code.
Del.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// HERE I WANT REFRESH MY LISTVIEW
MainActivity.ArrayProdotto.remove(position); //Delete from main source
rowItem.remove(position) // Delete from adapter
CustomAdapter.ShowDialog("Elemento eliminato con successo!", context);
notifyDataSetChanged(); // Refresh Adapter
}
});

1). Remove your item from adapter:
adapter.remove(adapter.getItem(position));
2). Call adapter.notifyDataSetChanged();
You should call notifyDataSetChanged() every time when you deleting item from adapter. Not only in onResume.
Note, that you should remove item from adapter, to change ListView items, not from storage(ArrayList, SQLite, or else).

Can't swiping between fragments in viewpager with buttons

I would change fragment in the viewpager using a button in every fragment. So in the fragment in position 0 i have a button and onClick i'll change in second fragment (position 1) and so on. Actually i'm using this code in the fragment at position 0:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.open_welcome_fragment_layout, container,
false);
final WelcomeViewPager pagerV = new WelcomeViewPager();
Button nextBtnOpen = (Button)view.findViewById(R.id.button_next_open);
nextBtnOpen.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
((WelcomeViewPager)getActivity()).setCurrentItem(1, true);
}
});
return view;
}
position 1:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.firstwelcomefrg, container, false);
final WelcomeViewPager pagerV = new WelcomeViewPager();
Button nextBtn = (Button)view.findViewById(R.id.button_next_one);
nextBtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
((WelcomeViewPager)getActivity()).setCurrentItem(2, true);
}
});
return view;
}
position 2:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.secondwelcomefrg, container,
false);
final WelcomeViewPager pagerV = new WelcomeViewPager();
Button nextBtnTwo = (Button)view.findViewById(R.id.button_next_two);
nextBtnTwo.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
((WelcomeViewPager)getActivity()).setCurrentItem(3, true);
}
});
return view;
}
and in my ViewPager Activity i created this method:
public void setCurrentItem (int item, boolean smoothScroll) {
mViewPager.setCurrentItem(item, smoothScroll);
}
unfortunatelly not works. I can change from first to second fragment but every fragment returns to second.. Seems that the only one position accepted is the first one. In this case:
((WelcomeViewPager)getActivity()).setCurrentItem(1, true);
why this behaviour?

I think what you are trying to do is to have tabs and each tab to help switch between views. You should use actionBar tabs for this, not buttons.
This should help. It is a pretty detailed tutorial.

Do you want Button ? I use for similary problem solving with listener. Example of code below. Maybe help.
PagerActivity.java
import com.example.zzztest2.MyPagerAdapter.OnPagerItemSelected;
public class PagerActivity extends Activity implements OnPagerItemSelected {
ViewPager viewPager;
ArrayList<Bitmap> bitmapArray=null;
ArrayList<String> textArray=null;
ArrayList<String> urlArray=null;
int pagexi;
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_reklamapager);
viewPager = (ViewPager) findViewById(R.id.view_pager);
//setting adapter
new readAsync().execute();
}//end oncreate
//switch page
public void pagerItemSelected(int newposition) {
viewPager.setCurrentItem(newposition);
}
Setting my adapter in onpostexecute Async
protected void onPostExecute(String file_url) {
MyPagerAdapter adapter = new MyPagerAdapter(PagerActivity.this, textArray, urlArray, bitmapArray, PagerActivity.this );
viewPager.setAdapter(adapter);
//start position
int pagexi = 2;
viewPager.setCurrentItem(pagexi);
}
MyPagerAdapte.java
public class MyPagerAdapter extends PagerAdapter {
Context context;
OnPagerItemSelected mListener;
ArrayList<String> textArray;
ArrayList<String> urlArray;
ArrayList<Bitmap> bitmapArray;
ImageView imageView;
TextView textreklama1;
Button btnSwitchPage;
public Activity activity;
String firmax;
String adresarx;
MyPagerAdapter(Context context, ArrayList<String> textArray, ArrayList<String> urlArray, ArrayList<Bitmap> bitmapArray, OnPagerItemSelected listener){
this.context=context;
this.textArray=textArray;
this.urlArray=urlArray;
this.bitmapArray=bitmapArray;
this.mListener = listener;
}
#Override
public int getCount() {
return textArray.size();
}
public Object instantiateItem(ViewGroup collection, int position) {
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.reklamator_new, null);
String indexx = textArray.get(position).toString();
String delims2 = "[;]+";
String[] riadokxxx = indexx.split(delims2);
String ucex = riadokxxx[0].trim();
String dokx = riadokxxx[1].trim();
EditText inputUce = (EditText) view.findViewById(R.id.inputUce);
inputUce.setText(ucex);
EditText inputDok = (EditText) view.findViewById(R.id.inputDok);
inputDok.setText(dokx);
btnSwitchPage = (Button) view.findViewById(R.id.btnSwitchPage);
btnSwitchPage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//here set new position
int xxx=1;
mListener.pagerItemSelected(xxx);
}
});
((ViewGroup) collection).addView(view, 0);
return view;
}
#Override
public void destroyItem(ViewGroup arg0, int arg1, Object arg2) {
((ViewGroup) arg0).removeView((View) arg2);
}
#Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == ((View) arg1);
}
//new position
public interface OnPagerItemSelected {
void pagerItemSelected(int xxx);
}
}