How do I delete Items from recycler view and Firebase database? - java

I have a recycler view connected to my Firebase database. I have implemented the ItemTouchHelper. SImpleCallback method so that I am able to slide and the items off to delete them. My codes work, the only issue is that I am not deleting the data from the database. I can't seem to find anything method that can help my situation since I haven't used DocumentReference.
Can anybody help me with this, How do I delete the items from the database when I click the delete icon in the on child draw?
personal fragment with the ItemTouch Helper
public class personalFragment extends Fragment {
private FirebaseAuth mAuth;
private String currentUserID;
private RecyclerView recyclerView;
private FirebaseRecyclerAdapter adapter;
private DatabaseReference mDatabase;
private TextView expense_txt;
LinearLayout mExpense;
#SuppressLint("SourceLockedOrientationActivity")
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
final View myView = inflater.inflate(R.layout.fragment_personal, container, false);
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
String uid = user.getUid();
mExpense = myView.findViewById(R.id.recycler_layout);
mDatabase = FirebaseDatabase.getInstance().getReference("Expenses").child(uid);
mAuth = FirebaseAuth.getInstance();
currentUserID = mAuth.getCurrentUser().getUid();
recyclerView = myView.findViewById(R.id.recycler_expense);
expense_txt = myView.findViewById(R.id.expenses_txt);
getActivity().setRequestedOrientation(
ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
final LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
layoutManager.setStackFromEnd(true);
layoutManager.setReverseLayout(true);
recyclerView.setHasFixedSize(true);
DisplayItemOnRecycler();
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
sumExpenses();
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleCallback);
itemTouchHelper.attachToRecyclerView(recyclerView);
return myView;
}
public void deleteItem(){
}
ItemTouchHelper.SimpleCallback simpleCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT) {
#Override
public boolean onMove(#NonNull RecyclerView recyclerView, #NonNull RecyclerView.ViewHolder viewHolder, #NonNull RecyclerView.ViewHolder target) {
return false;
}
#Override
public void onSwiped(#NonNull RecyclerView.ViewHolder viewHolder, int direction) {
if(direction == ItemTouchHelper.LEFT ){
Toast.makeText(getActivity(), "Deleting", Toast.LENGTH_SHORT).show();
}
}
#Override
public void onChildDraw(#NonNull Canvas c, #NonNull RecyclerView recyclerView, #NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
new RecyclerViewSwipeDecorator.Builder(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
.addBackgroundColor(ContextCompat.getColor(personalFragment.this.getActivity(), R.color.Delete))
.addActionIcon(R.drawable.ic_delete_black_24dp)
.create()
.decorate();
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
};
private void DisplayItemOnRecycler(){
Query query = FirebaseDatabase.getInstance()
.getReference("Expenses")
.child(currentUserID)
.limitToLast(100);
FirebaseRecyclerOptions<PersonalExpenses> options =
new FirebaseRecyclerOptions.Builder<PersonalExpenses>()
.setQuery(query, PersonalExpenses.class)
.build();
adapter = new FirebaseRecyclerAdapter<PersonalExpenses, MyViewHolder>(options) {
#Override
protected void onBindViewHolder(final MyViewHolder holder, int position, PersonalExpenses personalExpenses) {
holder.setDate(personalExpenses.getDate());
holder.setDescription(personalExpenses.getDescription());
holder.setAmount(personalExpenses.getAmount());
holder.setType(personalExpenses.getType());
holder.setCurrency(personalExpenses.getCurrency());
}
#Override
public MyViewHolder onCreateViewHolder( ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.expense_recycler, parent, false);
return new MyViewHolder(view);
}
};
}
private void sumExpenses(){
mDatabase.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
int totalsum = 0;
for(DataSnapshot mySnapshot: dataSnapshot.getChildren()){
PersonalExpenses personal = mySnapshot.getValue(PersonalExpenses.class);
totalsum += Integer.parseInt(personal.getAmount());
String stTotalsum = String.valueOf((totalsum));
expense_txt.setText(stTotalsum);
}
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
}
#Override
public void onStart() {
super.onStart();
adapter.startListening();
}
#Override
public void onStop() {
super.onStop();
adapter.stopListening();
}
public static class MyViewHolder extends RecyclerView.ViewHolder {
private final View mView;
public MyViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
protected void setDate(String date) {
TextView mDate = mView.findViewById(R.id.date_income);
mDate.setText(date);
}
protected void setType(String type) {
TextView mType = mView.findViewById(R.id.type_txt);
mType.setText(type);
}
protected void setDescription(String description) {
TextView mNote = mView.findViewById(R.id.note_txt);
mNote.setText(description);
}
protected void setAmount(String amount) {
TextView mAmount = mView.findViewById(R.id.amount_income);
String strammount = String.valueOf(amount);
mAmount.setText(strammount);
}
protected void setCurrency(String currency) {
TextView mCurrency = mView.findViewById(R.id.currency);
mCurrency.setText(currency);
}
}
}
This is the ItemTouchHelper method in the fragment above
ItemTouchHelper.SimpleCallback simpleCallback = new ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT) {
#Override
public boolean onMove(#NonNull RecyclerView recyclerView, #NonNull RecyclerView.ViewHolder viewHolder, #NonNull RecyclerView.ViewHolder target) {
return false;
}
#Override
public void onSwiped(#NonNull RecyclerView.ViewHolder viewHolder, int direction) {
if(direction == ItemTouchHelper.LEFT ){
Toast.makeText(getActivity(), "Deleting", Toast.LENGTH_SHORT).show();
}
}
#Override
public void onChildDraw(#NonNull Canvas c, #NonNull RecyclerView recyclerView, #NonNull RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
new RecyclerViewSwipeDecorator.Builder(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
.addBackgroundColor(ContextCompat.getColor(personalFragment.this.getActivity(), R.color.Delete))
.addActionIcon(R.drawable.ic_delete_black_24dp)
.create()
.decorate();
super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
};

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For example:- If I have ten buttons in my recycler view and I want to change the color of a button at position 5 how would I access it?
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Add a button to your viewholder layout and
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Code:
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e.printStackTrace();
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viewShadow();
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this.mData.getViewHolder().getCompleteText().setVisibility(View.VISIBLE);
this.mData.getViewHolder().getDeleteText().setVisibility(View.INVISIBLE);
this.mData.getViewHolder().getBackground().setBackgroundColor(getResources().getColor(R.color.colorComplete));
}
}
ItemTouchHelper.SimpleCallback.getDefaultUIUtil().onDraw(c, recyclerView, foregroundView, dX, dY,actionState, isCurrentlyActive);
}
#Override
public void onChildDrawOver(Canvas c, RecyclerView recyclerView, ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
final View foregroundView = ((com.lab1.ac01220.bloomv2.ViewHolder) viewHolder).getForeground();
ItemTouchHelper.SimpleCallback.getDefaultUIUtil().onDrawOver(c, recyclerView, foregroundView, dX, dY,actionState, isCurrentlyActive);
}
}
RecycleitemTouchHelper.java
public RecycleItemTouchHelper(int dragDirs, int swipeDirs, RecyclerItemTouchHelperListener listener) {
super(dragDirs, swipeDirs);
this.listener = listener;
}
#Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return false;
}
#Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
this.listener.onSwiped(viewHolder, direction, viewHolder.getAdapterPosition());
}
#Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
this.listener.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
#Override
public void onChildDrawOver(Canvas c, RecyclerView recyclerView,
RecyclerView.ViewHolder viewHolder, float dX, float dY,
int actionState, boolean isCurrentlyActive) {
this.listener.onChildDrawOver(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
}
#Override
public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
final View foregroundView = ((ViewHolder) viewHolder).getForeground();
getDefaultUIUtil().clearView(foregroundView);
}
#Override
public int convertToAbsoluteDirection(int flags, int layoutDirection) {
return super.convertToAbsoluteDirection(flags, layoutDirection);
}
public interface RecyclerItemTouchHelperListener {
void onSwiped(RecyclerView.ViewHolder viewHolder, int direction, int position);
void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive);
void onChildDrawOver(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive);
}
}
RecycleViewAdapter.java:
public class RecycleViewAdapter extends RecyclerView.Adapter<ViewHolder>{
private LayoutInflater inflater = null;
private List<GlobalLists> results = null;
private DataCommunication mData = null;
public RecycleViewAdapter(Context context, List<GlobalLists> results){
this.inflater = LayoutInflater.from(context);
this.results = results;
this.mData = (DataCommunication)context;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.custom_row, parent, false);
ViewHolder holder = new ViewHolder(view);
this.mData.setViewHolder(holder);
return holder;
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
GlobalLists item = this.results.get(position);
holder.setRowTitle(item.getTitle());
//Grab the first 14 characters of the contents if the row is not null
if(item.getContents() != null){
StringBuffer currentContent = new StringBuffer(item.getContents().substring(0, Math.min(item.getContents().length(),28)));
if(item.getContents().length() > 28) currentContent.append("...");
holder.setRowContent(currentContent.toString());
}
}
public void reloadAdapterData(List<GlobalLists> refresh){
this.results = refresh;
}
#Override
public int getItemCount() {
return this.results == null || this.results.isEmpty() ? 0 : this.results.size();
}
public List<GlobalLists> getResults(){
return this.results;
}
}

The problem was that I was simply setting the first ViewHolder to be a global variable and only anacting changes on that. Instead I should have been getting the current View being draw in onChildDraw and performing functions on that:
Was:
#Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
final View foregroundView = ((com.lab1.ac01220.bloomv2.ViewHolder) viewHolder).getForeground();
if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
if(dX < 0){
this.mData.getViewHolder().getDeleteText().setVisibility(View.VISIBLE);
this.mData.getViewHolder().getCompleteText().setVisibility(View.INVISIBLE);
this.mData.getViewHolder().getBackground().setBackgroundColor(getResources().getColor(R.color.colorAccent));
} else if(dX >0){
this.mData.getViewHolder().getCompleteText().setVisibility(View.VISIBLE);
this.mData.getViewHolder().getDeleteText().setVisibility(View.INVISIBLE);
this.mData.getViewHolder().getBackground().setBackgroundColor(getResources().getColor(R.color.colorComplete));
}
}
ItemTouchHelper.SimpleCallback.getDefaultUIUtil().onDraw(c, recyclerView, foregroundView, dX, dY,actionState, isCurrentlyActive);
}
Should be:
#Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
com.lab1.ac01220.bloomv2.ViewHolder current = (com.lab1.ac01220.bloomv2.ViewHolder) viewHolder;
final View foregroundView = ((com.lab1.ac01220.bloomv2.ViewHolder) viewHolder).getForeground();
if (isCurrentlyActive) {
if(dX < 0){
current.getDeleteText().setVisibility(View.VISIBLE);
current.getCompleteText().setVisibility(View.INVISIBLE);
current.getBackground().setBackground(getResources().getDrawable(R.drawable.ic_rounded_rectangle_accent));
} else if(dX >0){
current.getCompleteText().setVisibility(View.VISIBLE);
current.getDeleteText().setVisibility(View.INVISIBLE);
current.getBackground().setBackground(getResources().getDrawable(R.drawable.ic_rounded_rectangle_complete));
}
}
ItemTouchHelper.SimpleCallback.getDefaultUIUtil().onDraw(c, recyclerView, foregroundView, dX, dY,actionState, isCurrentlyActive);
}

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