How to remove item from ListView and sharedpreferences android studio?

How to remove item from ListView and sharedpreferences android studio? - java

i want to be able to do this to the code i have already I am new to programing please help.
- Add an icon the user can click (per item) to remove it
- When clicked that item on the list should be removed
-The item should be removed from storage as well (so it doesn't appear next time they load up the app)
here is my code:
MainActivity.java
public class MainActivity extends AppCompatActivity {
private static final String Log_TAG = "ToDoApp";
private ToDoListManager listManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView todoList = (ListView) findViewById(R.id.todo_list);
listManager = new ToDoListManager(getApplicationContext());
ToDoItemAdapter adapter = new ToDoItemAdapter(
this,
listManager.getList()
);
ImageButton addButton = (ImageButton) findViewById(R.id.add_item);
addButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onAddButtonClick();
}
});
}
#Override
protected void onPause() {
super.onPause();
listManager.saveList();
}
private void onAddButtonClick() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(R.string.add_item);
final EditText input = new EditText(this);
input.setInputType(InputType.TYPE_CLASS_TEXT);
builder.setView(input);
builder.setPositiveButton(
R.string.ok,
new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
ToDoItem item = new ToDoItem(
input.getText().toString(),
false
);
listManager.addItem(item);
}
});
builder.setNegativeButton(
R.string.cancel,
new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
}
private class ToDoItemAdapter extends ArrayAdapter<ToDoItem> {
private Context context;
private List<ToDoItem> items;
public ToDoItemAdapter(
Context context,
List<ToDoItem> items
) {
super(context, -1, items);
this.context = context;
this.items = items;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.to_do_item_layout, parent, false);
}
TextView textView = (TextView) convertView.findViewById(R.id.item);
CheckBox CheckBox = (CheckBox) convertView.findViewById(R.id.CheckBox);
textView.setText(items.get(position).getDescription());
CheckBox.setChecked(items.get(position).isComplete());
convertView.setTag(items.get(position));
convertView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ToDoItem item = (ToDoItem) v.getTag();
item.toggleComplete();
notifyDataSetChanged();
}
});
return convertView;
}
}
}
todolistmanager.java
public class ToDoListManager {
private static final String APP_PREFERENCES = "todoapp";
private static final String TODO_ITEMS = "itemslist";
private List<ToDoItem> items;
private SharedPreferences savedData;
public ToDoListManager(Context context) {
savedData = context.getSharedPreferences (
APP_PREFERENCES,
Context.MODE_PRIVATE
);
String json = savedData.getString(TODO_ITEMS, null);
if(json == null) {
items = new ArrayList<>();
} else {
Type type = new TypeToken<List<ToDoItem>>() {}.getType();
items = new Gson().fromJson(json, type);
}
}
public List<ToDoItem> getList() {
return items;
}
public void addItem(ToDoItem item) {
items.add(item);
saveList();
}
public void saveList() {
SharedPreferences.Editor edit = savedData.edit();
edit.clear();
String json = new Gson().toJson(items);
edit.putString(TODO_ITEMS, json);
edit.apply();
}
}
todoItem.java
public class ToDoItem {
private String description;
private boolean isComplete;
public ToDoItem(String description,boolean isComplete) {
this.description = description;
this.isComplete = isComplete;
}
public String getDescription() {
return description;
}
public boolean isComplete() {
return isComplete;
}
public void toggleComplete() {
isComplete = !isComplete;
}
#Override
public String toString() {
return getDescription();
}
}
Activity_Main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<EditText
android:id="#+id/txtItem"
android:layout_width="240dp"
android:layout_height="wrap_content"
android:inputType="text"
android:hint="#string/hintTxtItem"
/>
<Button
android:id="#+id/btnAdd"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/lblBtnAdd"
android:layout_toRightOf="#id/txtItem"
/>
<TextView
android:id="#android:id/empty"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/txtItem"
android:text="#string/txtEmpty"
android:gravity="center_horizontal"
/>
<ListView
android:id="#android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#id/txtItem"
android:choiceMode="multipleChoice" >
</ListView>
<Button
android:id="#+id/btnDel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="#string/lblBtnDel" />
to_do_item_layout.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"
android:weightSum="1">
<CheckBox
android:id="#+id/CheckBox"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="#+id/item"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"/>
<ListView
android:layout_weight="20"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="#+id/btnDel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:text="#string/lblBtnDel" />

Step1: Create activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<EditText
android:id="#+id/txtItem"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:inputType="text" />
<Button
android:id="#+id/btnAdd"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_toRightOf="#id/txtItem"
android:text="Add" />
</LinearLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<ListView
android:id="#+id/lvTodo"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:choiceMode="multipleChoice" />
<TextView
android:id="#android:id/empty"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center_horizontal"
android:text="No data"
android:visibility="invisible" />
</RelativeLayout>
<Button
android:id="#+id/btnDel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Delete" />
</LinearLayout>
Step2: Create to todo_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:padding="10dp"
android:orientation="horizontal"
android:weightSum="1">
<TextView
android:id="#+id/tvTodoName"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="Learn Android"
android:textSize="20sp" />
<CheckBox
android:id="#+id/cbChooseTodo"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
Step3: Define Object Todo
public class ToDoItem {
private String description;
private boolean isComplete;
public ToDoItem(String description, boolean isComplete) {
this.description = description;
this.isComplete = isComplete;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public boolean isComplete() {
return isComplete;
}
public void setComplete(boolean complete) {
isComplete = complete;
}
}
Step4: Create TodoItemAdapter class
public class TodoItemAdapter extends ArrayAdapter<ToDoItem> {
private ArrayList<ToDoItem> arrayListTodo;
private LayoutInflater layoutInflater;
public TodoItemAdapter(Context context, int resource, ArrayList<ToDoItem> objects) {
super(context, resource, objects);
this.arrayListTodo = objects;
this.layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null){
holder = new ViewHolder();
convertView = layoutInflater.inflate(R.layout.todo_item, parent,false);
holder.tvTodoName = (TextView)convertView.findViewById(R.id.tvTodoName);
holder.cbTodoChoose = (CheckBox)convertView.findViewById(R.id.cbChooseTodo);
convertView.setTag(holder);
}else {
holder = (ViewHolder)convertView.getTag();
}
final ToDoItem toDoItem = arrayListTodo.get(position);
holder.tvTodoName.setText(toDoItem.getDescription());
holder.cbTodoChoose.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
toDoItem.setComplete(isChecked);
}
});
holder.cbTodoChoose.setChecked(toDoItem.isComplete());
return convertView;
}
public static class ViewHolder{
public TextView tvTodoName;
public CheckBox cbTodoChoose;
}
}
Step5: Process on the MainActivity class
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private ListView lvTodoItem;
private ArrayList<ToDoItem> toDoItems;
private TodoItemAdapter todoItemAdapter;
private Button btnDel;
private Button btnAdd;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initData();
}
private void initData(){
toDoItems = new ArrayList<>();
todoItemAdapter = new TodoItemAdapter(MainActivity.this, R.layout.todo_item, toDoItems);
lvTodoItem = (ListView)findViewById(R.id.lvTodo);
lvTodoItem.setAdapter(todoItemAdapter);
btnAdd = (Button)findViewById(R.id.btnAdd);
btnDel = (Button)findViewById(R.id.btnDel);
btnAdd.setOnClickListener(this);
btnDel.setOnClickListener(this);
}
#Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btnAdd:
addTodoItem();
break;
case R.id.btnDel:
deleteTodoItem();
break;
}
}
private void addTodoItem() {
}
private void deleteTodoItem() {
for (int i= toDoItems.size()-1; i>=0 ; i--){
ToDoItem toDoItem = toDoItems.get(i);
if (toDoItem.isComplete()){
toDoItems.remove(i);
}
}
todoItemAdapter.notifyDataSetChanged();
}
}
It is working fine. Thanks.

Related

Checkbox on RecyclerView and their State

After some research on this one of the complex issue
I did this like this for my currency convertor project:
Below are steps:
Created A Custom Adapter with inner ViewHolder
Created an Interference for Selection changed and to notify the
Adaper in MainActivty
Created an Model Class Created an layout for My list
Coding:
Adapter and View Holder
class Adapter extends RecyclerView.Adapter<Adapter.VH> {
ArrayList<Currency> list, checkedCurrencies = new ArrayList<>();
CurrencySelectionChangelistener listener;
public Adapter(#NonNull ArrayList<Currency> list, CurrencySelectionChangelistener listener) {
this.list = list;
this.listener = listener;
}
#NonNull
#Override
public VH onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
return new VH(LayoutInflater.from(getContext()).inflate(R.layout.layout_list_of_all_items, parent, false));
}
#Override
public void onBindViewHolder(#NonNull VH holder, #SuppressLint("RecyclerView") int position) {
Currency currentCurrency = list.get(position);
holder.checkBox.setChecked(currentCurrency.isChecked());
holder.mDis.setText(currentCurrency.getDescription());
//ignore below line it's just for sorting the string to set On TextView and with another purpose
String name = currentCurrency.getName().toLowerCase().replace(" ", "");
holder.mName.setText(name.toUpperCase());
holder.mLogo.setImageResource(currentCurrency.getLogo(name));
holder.checkBox.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (holder.checkBox.isChecked()) {
list.get(position).setChecked(true);
checkedCurrencies.add(currentCurrency);
} else if (!holder.checkBox.isChecked()) {
list.get(position).setChecked(false);
checkedCurrencies.remove(currentCurrency);
}
//calling the interference's function
onSelection(checkedCurrencies);
}
});
}
#Override
public int getItemCount() {
return list.size();
}
class VH extends RecyclerView.ViewHolder {
TextView mName, mDis;
ImageView mLogo;
CheckBox checkBox;
public VH(#NonNull View itemView) {
super(itemView);
checkBox = itemView.findViewById(R.id.checkboxAllItems);
mLogo = itemView.findViewById(R.id.ImageViewAllItemLogo);
mName = itemView.findViewById(R.id.textViewAllItemCName);
mDis = itemView.findViewById(R.id.textViewAllItemCDis);
}
}
}
Interface
public interface CurrencySelectionChangelistener {
public void onSelection(ArrayList<Currency> currencies);}
Fragment in Which I'm using RecyclerView
public class AddMoreCurrencyFragment extends Fragment implements CurrencySelectionChangelistener {
FragmentAddNewCurrencyBinding binding;
ArrayList<Currency> currencies;
Adapter adapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
binding = FragmentAddNewCurrencyBinding.inflate(inflater);
CurrencyContainerActivity.title.setVisibility(View.VISIBLE);
CurrencyContainerActivity.title.setText("Add Currency");
CurrencyContainerActivity.backBtn.setVisibility(View.VISIBLE);
currencies = new ArrayList<>();
for (Currency c : CurrencyContainerActivity.listOfCurrencies) {
currencies.add(new Currency(c.getName(), c.getDescription(), false));
}
adapter = new Adapter(currencies, this);
binding.recView.setAdapter(adapter);
binding.done.setOnClickListener(view -> {
});
return binding.getRoot();
}
#Override
public void onSelection(ArrayList<Currency> currencies) {
CurrencyContainerActivity.listToAdd.addAll(currencies);
Toast.makeText(getContext(), currencies.toString(), Toast.LENGTH_LONG).show();
adapter.notifyDataSetChanged();
}
}
xml layout for each item
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="60dp"
android:background="#color/white"
android:orientation="vertical"
android:weightSum="3">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="59dp"
android:gravity="center_vertical"
android:orientation="horizontal"
android:padding="10dp"
android:weightSum="3">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.89"
app:cardCornerRadius="16dp">
<ImageView
android:id="#+id/ImageViewAllItemLogo"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/flag" />
</androidx.cardview.widget.CardView>
<TextView
android:id="#+id/textViewAllItemCName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginEnd="19dp"
android:layout_weight=".75"
android:fontFamily="#font/poppins"
android:text="#string/pkr"
android:textAlignment="center"
android:textAllCaps="true"
android:textColor="#color/black"
android:textSize="16sp" />
<TextView
android:id="#+id/textViewAllItemCDis"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:layout_weight="0.47"
android:fontFamily="#font/poppins"
android:text="#string/pkr"
android:textAlignment="textStart"
android:textColor="#color/black"
android:textSize="13sp" />
<CheckBox
android:id="#+id/checkboxAllItems"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_weight="0.90"
android:background="#drawable/radio_selector"
android:button="#android:color/transparent" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#3F000000" />
</LinearLayout>
Model Class
public class Currency {
private String Name, Description;
private int logo;
boolean isChecked;
public Currency(String name, String description, boolean isChecked) {
Name = name;
Description = description;
this.isChecked = isChecked;
}
public boolean isChecked() {
return isChecked;
}
public void setChecked(boolean checked) {
isChecked = checked;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}
public String getDescription() {
return Description;
}
public void setDescription(String description) {
Description = description;
}
}
if anything i missed can for that. Thanks

How to refer FIrebase Child in Child record in Firebase Recycler adapter to show in recyclerview

I have written code to list contacts in recycler view. But it doesn't display value in recycler view. The code is given below.
HomeActivity.java
private DatabaseReference mDatabase;
private RecyclerView PList;
private FirebaseRecyclerAdapter<project, ProjViewHolder> FBRA;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
PList = findViewById(R.id.ProjList);
PList.setHasFixedSize(true);
PList.setLayoutManager(new LinearLayoutManager(this));
mDatabase = FirebaseDatabase.getInstance().getReference().child("Contacts");
}
#Override
protected void onStart() {
super.onStart();
FirebaseRecyclerOptions<project> options = new FirebaseRecyclerOptions.Builder<project>().setQuery(mDatabase, project.class).build();
FBRA = new FirebaseRecyclerAdapter<project, ProjViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull ProjViewHolder holder, int position, #NonNull project model) {
String proj_key = getRef(position).getKey();
holder.cpname.setText(model.getCname());
holder.cplocation.setText(model.getCcity());
holder.ccname.setText(model.getPcontact());
holder.ccdesig.setText(model.getPdesig());
}
#Override
public ProjViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.proj_row, parent, false);
return new ProjViewHolder(view);
}
};
PList.setAdapter(FBRA);
FBRA.startListening();
}
public class ProjViewHolder extends RecyclerView.ViewHolder {
TextView cpname, cplocation, ccname, ccdesig;
ProjViewHolder(#NonNull View itemView) {
super(itemView);
cpname = itemView.findViewById(R.id.FCName);
cplocation = itemView.findViewById(R.id.FCLocation);
ccname = itemView.findViewById(R.id.FPName);
ccdesig = itemView.findViewById(R.id.FPDesig);
}
}
#Override
protected void onStop() {
super.onStop();
FBRA.stopListening();
}
FormActivity.java
public class FormActivity extends AppCompatActivity {
private EditText CName, PContact,PDesig, CCity;
private FirebaseDatabase mDatabase;
private Button Fbtn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_form);
CName = findViewById(R.id.CompName);
PContact = findViewById(R.id.PContact);
PDesig = findViewById(R.id.PDesig);
CCity = findViewById(R.id.CCity);
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#Override
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String dCName = CName.getText().toString().trim();
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mDbRef.child("cname").setValue(dCName);
mDbRef.child("pcontact").setValue(dPContact);
mDbRef.child("pdesig").setValue(dPDesig);
mDbRef.child("ccity").setValue(dCCity);
Toast.makeText(FormActivity.this, "Contact Submitted Successfully", Toast.LENGTH_LONG).show();
Intent intent = new Intent(FormActivity.this, HomeActivity.class);
startActivity(intent);
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public class project {
String cname, pcontact, pdesig, ccity;
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}
public project(String cname, String pcontact, String pdesig, String ccity) {
this.cname = cname;
this.pcontact = pcontact;
this.pdesig = pdesig;
this.ccity = ccity;
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public String getCname() {
return cname;
}
public void setCname(String cname) {
this.cname = cname;
}
public String getPcontact() {
return pcontact;
}
public void setPcontact(String pcontact) {
this.pcontact = pcontact;
}
public String getPdesig() {
return pdesig;
}
public void setPdesig(String pdesig) {
this.pdesig = pdesig;
}
public String getCcity() {
return ccity;
}
public void setCcity(String ccity) {
this.ccity = ccity;
}
}
HomeActivity.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:orientation="vertical"
tools:context=".HomeActivity">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="5dp"
android:id="#+id/ProjList"
/>
</RelativeLayout>
ProjRow.xml
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_margin="2dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<TextView
android:id="#+id/FCName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAllCaps="true"
android:elegantTextHeight="true"
android:textColor="#color/colorBlue"
android:maxLength="25"
android:paddingTop="5dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:textSize="16dp"
android:textStyle="bold"
android:layout_marginTop="10dp"
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android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:layout_alignParentRight="true"
android:textAllCaps="true"
android:elegantTextHeight="true"
android:textColor="#color/colorDark"
android:layout_marginTop="13dp"
android:paddingTop="5dp"
android:textSize="14dp"
/>
<TextView
android:id="#+id/FPName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/FCName"
android:layout_alignParentLeft="true"
android:elegantTextHeight="true"
android:textStyle="bold"
android:textColor="#color/colorText"
android:paddingTop="5dp"
android:paddingRight="3dp"
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp"
android:textSize="15dp"
/>
<TextView
android:id="#+id/FPDesig"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/FCName"
android:layout_alignParentRight="true"
android:layout_marginTop="10dp"
android:layout_marginRight="5dp"
android:padding="5dp"
android:textSize="14dp"
android:textColor="#color/colorNext"
android:elegantTextHeight="true"
/>
</RelativeLayout>
</androidx.cardview.widget.CardView>
the code is working fine without error. But the intended value is not captured from database. If push() is removed from DatabaseReference mDbRef = mDatabase.getReference().child("Contacts").child(name).push(); , it works absolutely fine. but it overwrites on existing data while adding new data for the same 'name'. After adding push, the data are getting stored in sub child record. Please guide me how to refer and get back the data in recycleview adapter.
The each record stored under 'Contacts' before adding push()but overwrites when added a person for the same company.
After adding push() each record stored under company name with unique key.

SearchView not working with a ListView populated with CustomAdapter extends ArrayAdapter<T>

I followed this code on SearchView In ListView having a custom Adapter
which works fine.I tried to implement it on my project but seems to be not working.
provided that data is populated from Firebase database server.
I have removed the code for firebase which is not cause of the error.
I don't get any error but it is not working.
Here is what I have tried :
ShowFriendsActivity.java
public class ShowFriendsActivity extends AppCompatActivity implements SearchView.OnQueryTextListener{
private ListView mMessageListView;
private ShowFriendsAdapter showFriendsAdapter;
SearchView searchView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.show_online_users);
searchView = (SearchView) findViewById(R.id.myownsearchview);
SettingFirebaseAndListView();
}
private void SettingFirebaseAndListView() {
mMessageListView = (ListView) findViewById(R.id.show_friends_listview);
final List<AuthenticatedUser> authenticatedUserList = new ArrayList<>();
showFriendsAdapter = new ShowFriendsAdapter(this, R.layout.show_friends_item_layout, authenticatedUserList);
mMessageListView.setAdapter(showFriendsAdapter);
mMessageListView.setTextFilterEnabled(true);
setupSearchView();
}
private void setupSearchView() {
searchView.setIconifiedByDefault(false);
searchView.setOnQueryTextListener(this);
searchView.setSubmitButtonEnabled(true);
searchView.setQueryHint("Search Friend");
}
#Override
public boolean onQueryTextSubmit(String newText) {
return true;
}
#Override
public boolean onQueryTextChange(String s) {
mMessageListView.setFilterText(s);
return false;
}
}
ShowFriendsAdapter.java CustomAdapter which extends ArrayAdapter and implements Filterable Interface
public class ShowFriendsAdapter extends ArrayAdapter<AuthenticatedUser> implements Filterable{
Cursor cr;
SQLiteDatabase db;
Context context;
List<AuthenticatedUser> listofAuthenticatedUsers;
List<AuthenticatedUser> listofAuthenticatedUsers2;
public ShowFriendsAdapter(Context context, int resource,List<AuthenticatedUser> objects) {
super(context, resource, objects);
this.context = context;
listofAuthenticatedUsers = objects;
}
public Filter getFilter(){
return new Filter() {
#Override
protected FilterResults performFiltering(CharSequence constraint) {
final FilterResults oReturn = new FilterResults();
final ArrayList<AuthenticatedUser> results = new ArrayList<AuthenticatedUser>();
if(listofAuthenticatedUsers2==null)
listofAuthenticatedUsers2=listofAuthenticatedUsers;
if(constraint!=null){
if (listofAuthenticatedUsers2 != null && listofAuthenticatedUsers2.size() > 0){
for (final AuthenticatedUser g : listofAuthenticatedUsers2) {
if (g.getName().toLowerCase()
.contains(constraint.toString()))
results.add(g);
}
}
oReturn.values = results;
}
return oReturn;
}
#Override
#SuppressWarnings("unchecked")
protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
listofAuthenticatedUsers = (ArrayList<AuthenticatedUser>) filterResults.values;
notifyDataSetChanged();
}
};
}
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
#NonNull
#Override
public View getView(int position,View convertView,ViewGroup parent) {
if (convertView == null) {
convertView = ((Activity) getContext()).getLayoutInflater().inflate(R.layout.show_friends_item_layout, parent, false);
}
TextView userName = (TextView) convertView.findViewById(R.id.friend_name_textview);
TextView userEmail = (TextView) convertView.findViewById(R.id.friend_email_id_textview);
final ImageView userImage = (ImageView) convertView.findViewById(R.id.friend_name_image);
assert currentItem != null;
userName.setText(currentItem.getName());
userEmail.setText(currentItem.getEmail());
// If true , the app crashes
userImage.setClickable(true);
userImage.setEnabled(true);
userImage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
}
});
return convertView;
}
}
AuthenticatedUser.java
public class AuthenticatedUser {
private String Name;
private String Email;
private String imageUrl;
// constructor
public AuthenticatedUser(){}
public AuthenticatedUser(String name, String email, String imageUrl) {
Name = name;
Email = email;
this.imageUrl = imageUrl;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}
public String getEmail() {
return Email;
}
public void setEmail(String email) {
Email = email;
}
public String getImageUrl() {
return imageUrl;
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
}
The row layout show_friends_item_layout.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="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<de.hdodenhof.circleimageview.CircleImageView
android:id="#+id/friend_name_image"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_margin="8dp"
android:onClick="ChangeTheDisplayImage"
android:src="#drawable/contacts"
app:civ_border_color="#006064"
app:civ_border_width="2dp"
app:srcCompat="#drawable/contacts"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:orientation="vertical">
<TextView
android:id="#+id/friend_name_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Name"
android:textColor="#color/black"
android:textSize="#dimen/authen_user_size"/>
<TextView
android:id="#+id/friend_email_id_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Email ID"
android:textColor="#color/black"
android:textSize="8sp"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
And my the main layout of my activity
show_online_users.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="com.google.firebase.udacity.friendlychat.friends.ShowFriendsActivity">
<android.support.v7.widget.Toolbar
android:id="#+id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="60dp"
style="#style/HeaderBar"
app:theme="#style/Theme.AppCompat.DayNight.DarkActionBar"
app:popupTheme="#style/Base.ThemeOverlay.AppCompat.Dark.ActionBar"
android:elevation="4dp"
/>
<SearchView
android:id="#+id/myownsearchview"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_below="#+id/my_toolbar"
android:layout_marginTop="4dp"
android:tooltipText="Search"/>
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/swipeRefresh_Activity_show_Friends"
android:layout_marginTop="110dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ListView
android:layout_marginTop="120dp"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="#+id/show_friends_listview"/>
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>

Can't display items in RecyclerView

I am having problems in displaying cards dynamically from a recycler view. Here's my code.
CardActivity.java
public class CardActivity extends AppCompatActivity {
CardAdapter mAdapter;
RecyclerView mRecyclerView;
ArrayList<CardModel> data = new ArrayList<>();
public static String IMGS[] = {
"https://scontent.fmnl4-2.fna.fbcdn.net/v/t1.0-9/12540788_486126334923939_641652950626105372_n.jpg?oh=520090fa887ded912ddb7086fc69fc93&oe=57A04969",
"https://scontent.fmnl4-2.fna.fbcdn.net/t31.0-8/12973436_521081094761796_6679453535369186441_o.jpg",
"https://scontent.fmnl4-2.fna.fbcdn.net/v/t1.0-9/12191632_465602330309673_5460380145671805117_n.jpg?oh=51811b46395fee6e4bdb5394e6725591&oe=57D35DC3",
"https://scontent.fmnl4-2.fna.fbcdn.net/v/t1.0-9/10628472_397420133794560_5446805358922772021_n.jpg?oh=f23ab8761e05b2a50d0d0c9dec4d365b&oe=57DBF1CC",
"https://scontent.fmnl4-2.fna.fbcdn.net/t31.0-8/10697227_314766035393304_2937143993369666506_o.jpg",
"https://scontent.fmnl4-2.fna.fbcdn.net/v/t1.0-9/13133194_10154674163886840_3764712620850385571_n.jpg?oh=252cedf88040188f12ce99c29f3dd47e&oe=57DD7474"
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_card);
for (int i = 0; i < IMGS.length; i++) {
CardModel cardModel = new CardModel();
cardModel.setTitle("Card Title: " + i);
cardModel.setDescription("This is a card description");
cardModel.setUrl(IMGS[i]);
data.add(cardModel);
}
Toolbar toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle("Cards");
mRecyclerView = (RecyclerView) findViewById(R.id.cards);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(CardActivity.this);
linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(linearLayoutManager);
mRecyclerView.setHasFixedSize(true);
mAdapter = new CardAdapter(CardActivity.this, data);
mRecyclerView.setAdapter(mAdapter);
}
public boolean onOptionsItemSelected(MenuItem item) {
onBackPressed();
return true;
}
}
CardModel.java
public class CardModel {
String url,title,description;
public CardModel() {
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}
CardAdapter.java
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.CardHolder> {
private LayoutInflater inflater;
Context context;
List<CardModel> data = new ArrayList<>();
public CardAdapter(Context context, List<CardModel> data){
this.context = context;
this.data = data;
inflater = LayoutInflater.from(context);
}
#Override
public CardHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.card_layout,parent,false);
CardHolder cardHolder = new CardHolder(view);
return cardHolder;
}
#Override
public void onBindViewHolder(CardHolder holder, int position) {
holder.cardTitle.setText(data.get(position).getTitle());
holder.cardDescription.setText(data.get(position).getDescription());
Glide.with(context).load(data.get(position).getUrl())
.fitCenter()
.into(holder.cardImage);
}
#Override
public int getItemCount() {
return 0;
}
public static class CardHolder extends RecyclerView.ViewHolder {
ImageView cardImage;
TextView cardTitle;
TextView cardDescription;
public CardHolder(View cardView) {
super(cardView);
cardImage = (ImageView) cardView.findViewById(R.id.card_image);
cardTitle = (TextView) cardView.findViewById(R.id.card_title);
cardDescription = (TextView) cardView.findViewById(R.id.card_description);
}
}
}
activity_card.xml
<FrameLayout 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"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="com.braudy.android.mesasixprofiler.CardActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<include layout="#layout/toolbar"/>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="#+id/cards"
android:layout_width="match_parent"
android:layout_height="fill_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</FrameLayout>
card_layout.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:background="#FFFFFF"
android:padding="10dp">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="250dp"
android:background="#ffffff">
<ImageView
android:layout_width="match_parent"
android:layout_height="150dp"
android:alpha=".7"
android:id="#+id/card_image"
android:background="#ffff66"
android:src="#drawable/img1"
android:scaleType="centerCrop"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Braudy"
android:paddingLeft="15dp"
android:textColor="#FFFFFF"
android:background="#707070"
android:alpha=".8"
android:textSize="25sp"
android:id="#+id/card_title"
android:layout_alignBottom="#+id/card_image"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<TextView
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:text="This is a description"
android:paddingTop="5dp"
android:paddingLeft="15dp"
android:textColor="#A9A9AF"
android:textSize="15sp"
android:id="#+id/card_description"
android:layout_below="#+id/card_image"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>

Change this
#Override
public int getItemCount() {
return 0;
}
to
#Override
public int getItemCount() {
return data.size();
}

change here-
#Override
public int getItemCount() {
return data.size();
}
You have to declare how much views you want to inflate in your view.

UnsupportedOperationException in creating custom ListView in Android

i wanted to have a custom listView so I did this:
Created an Activity:
public class PRS_MainList_Act extends ListActivity {
MainListAdapter mladp;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_prs__main_list_);
ArrayList<MainMenuItem> menuItems = new ArrayList<MainMenuItem>();
menuItems.add(new MainMenuItem(getResources().getString(R.string.main_list_connectivity), getResources().getString(R.string.main_list_connectivityDesc)));
this.mladp = new MainListAdapter(this, R.layout.man_list_item, R.id.textView1, menuItems);
setListAdapter(mladp);
}
}
Create a class for menu items:
public class MainMenuItem {
private String itemText;
private String itemDescription;
private String itemIMG;
private int itemWeight;
private String itemAssociatedActivity;
public MainMenuItem(String itemText, String itemDescription) {
this.itemText = itemText;
this.itemDescription = itemDescription;
}
public String getItemText() {
return itemText;
}
public void setItemText(String itemText) {
this.itemText = itemText;
}
public String getItemIMG() {
return itemIMG;
}
public void setItemIMG(String itemIMG) {
this.itemIMG = itemIMG;
}
public int getItemWeight() {
return itemWeight;
}
public void setItemWeight(int itemWeight) {
this.itemWeight = itemWeight;
}
public String getItemAssociatedActivity() {
return itemAssociatedActivity;
}
public void setItemAssociatedActivity(String itemAssociatedActivity) {
this.itemAssociatedActivity = itemAssociatedActivity;
}
public String getItemDescription() {
return itemDescription;
}
public void setItemDescription(String itemDescription) {
this.itemDescription = itemDescription;
}
}
Custom array adapter:
public class MainListAdapter extends ArrayAdapter<MainMenuItem> {
ArrayList<MainMenuItem> menuItems;
public MainListAdapter(Context context, int resource,
int textViewResourceId, ArrayList<MainMenuItem> menuItems) {
super(context, resource, textViewResourceId, menuItems);
this.menuItems = menuItems;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) getContext().getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
view = vi.inflate(R.layout.man_list_item, parent);
}
MainMenuItem it = menuItems.get(position);
if (it != null) {
TextView titleTV = (TextView) view.findViewById(R.id.textView1);
TextView descriptionTV = (TextView) view.findViewById(R.id.textView2);
ImageView iconIV = (ImageView)view.findViewById(R.id.imageView1);
if (titleTV != null) {
titleTV.setText(it.getItemText());
}
if(descriptionTV != null){
descriptionTV.setText(it.getItemDescription());
}
if(iconIV != null){
if(it.getItemText().equals(getContext().getResources().getString(R.string.main_list_connectivity)))
iconIV.setImageResource(R.drawable.network_connections);
}
}
return view;
}
}
and here are my activity layout and item layout:
<LinearLayout 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"
tools:context=".PRS_MainList_Act" >
<ListView android:id="#android:id/list"
android:layout_height="match_parent"
android:layout_width="match_parent"/>
</LinearLayout>
Item Layout:
<?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="horizontal" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:src="#drawable/ic_launcher" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:text="Medium Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="#+id/textView2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:text="TextView" />
</LinearLayout>
</LinearLayout>
I got this error saying: java.lang.UnsupportedOperationException: addView(View, LayoutParams) is not supported in AdapterView
Thanks in advance for your help.

You can't use this version of the inflate method:
view = vi.inflate(R.layout.man_list_item, parent);
because this will add the inflated View to the parent, which isn't allowed in a ListView. Instead use this version:
view = vi.inflate(R.layout.man_list_item, parent, false);
which will inflate the view but will not add it to the parent. This version is important because it will provide the proper LayoutParams for your inflated view.

Develop Reference

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How to remove item from ListView and sharedpreferences android studio? - java

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SearchView not working with a ListView populated with CustomAdapter extends ArrayAdapter<T>

Can't display items in RecyclerView

UnsupportedOperationException in creating custom ListView in Android

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