私はいくつかのより詳細な説明が、あなたの活動の後に再び...）
public class CustomFirebaseAdapter extends RecyclerView.Adapter<CustomFirebaseAdapter.RecordViewHolderIns>
implements ValueEventListener, ChildEventListener {
private static final String TAG = "CustomFerebaseAdapter";
private OnItemClickListener onItemClickListener; //custom interface
private int maxOrderValue;
private ArrayList<Record> records = new ArrayList<>();
private ArrayList<DatabaseReference> references = new ArrayList<>();
public boolean isDragging = false;
private Query mainQuery;
private int textSize=9;
public CustomFirebaseAdapter(Class<Record> modelClass, @LayoutRes int modelLayout,
Class<MyFireBaseRvAdapter.RecordViewHolderIns> viewHolderClass, Query query) {
mainQuery = query;
// getting max order value to insert new record with maxOrderValue + 1
mainQuery.limitToLast(1)
.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot ds : dataSnapshot.getChildren()) {
Record r = ds.getValue(Record.class);
maxOrderValue = r.getPositionInList();
Log.d(TAG, "onDataChange: max value = " + maxOrderValue);
Log.d(TAG, "onDataChange: max value = " + r.getText());
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
//listner for first update
mainQuery.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
updateArrays(dataSnapshot);
notifyDataSetChanged();
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
mainQuery.addValueEventListener(this);
mainQuery.addChildEventListener(this);
}
@Override
public CustomFirebaseAdapter.RecordViewHolderIns onCreateViewHolder(ViewGroup parent, int viewType) {
View inflatedView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_item, parent, false);
return new CustomFirebaseAdapter.RecordViewHolderIns(inflatedView);
}
@Override
public void onBindViewHolder(RecordViewHolderIns holder, int position) {
populateViewHolder(holder, records.get(position), position);
}
public ArrayList<Record> getRecords() {
return records;
}
public ArrayList<DatabaseReference> getReferences() {
return references;
}
protected void populateViewHolder(CustomFirebaseAdapter.viewHolder, Record model, int position) {
//.................................
}
public void setTextSize(int textSize){
this.textSize =textSize;
}
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
public int getMaxOrderValue() {
return maxOrderValue;
}
public Record getItem(int position) {
return records.get(position);
}
public DatabaseReference getRef(int position) {
return references.get(position);
}
ArrayList<Record> snapshotList;
public ArrayList<Record> getDataSnapshot() {
return snapshotList;
}
public void onDataChanged() {
}
public void onItemMoved(int itemPos, int targetPos) {
if (itemPos < targetPos) {
for (int i = itemPos; i < targetPos; i++) {
Collections.swap(records, i, i + 1);
Collections.swap(references, i, i + 1);
}
} else {
for (int i = itemPos; i > targetPos; i--) {
Collections.swap(records, i, i - 1);
Collections.swap(references, i, i - 1);
}
}
notifyItemMoved(itemPos, targetPos);
}
@Override
public int getItemViewType(int position) {
return 0;
}
@Override
public int getItemCount() {
return records.size();
}
public void stopListening() {
}
private void updateArrays(DataSnapshot dataSnapshot){
records.clear();
references.clear();
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
references.add(snapshot.getRef());
records.add(snapshot.getValue(Record.class));
}
}
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (!isDragging) {
updateArrays(dataSnapshot);
}
}
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
Log.d(TAG, "onChildAdded: "+dataSnapshot.toString());
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
int i=-1;
for (DatabaseReference r : references) {
if(dataSnapshot.getKey().equals(r.getKey())){
i = references.indexOf(r);
break;
}
}
if(i!=-1){
records.set(i, dataSnapshot.getValue(Record.class ));
references.set(i, dataSnapshot.getRef());
if(!isDragging) notifyItemChanged(i);
}
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
int i=-1;
for (DatabaseReference r : references) {
if(dataSnapshot.getKey().equals(r.getKey())){
i = references.indexOf(r);
break;
}
}
if(i!=-1){
records.remove(i);
references.remove(i);
notifyItemRemoved(i);
}
Log.d(TAG, "onChildRemoved: child: "+i+" " +dataSnapshot.toString());
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
public void onStartDragging() {
isDragging = true;
}
public void onStopDragging() {
isDragging = false;
}
public class RecordViewHolderIns extends RecyclerView.ViewHolder {
public TextView text;
public TextView date;
public RecordViewHolderIns(final View itemView) {
super(itemView);
text = itemView.findViewById(R.id.activ_item_text);
date = itemView.findViewById(R.id.record_date);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (onItemClickListener != null) {
onItemClickListener.onItemClick(v, getAdapterPosition());
}
}
});
}
}
}
TouchHelper ...
ItemTouchHelper.SimpleCallback simpleCallback = new ItemTouchHelper.SimpleCallback(
ItemTouchHelper.UP | ItemTouchHelper.DOWN, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
@Override
public boolean isItemViewSwipeEnabled() {
return false;
}
@Override
public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
super.onSelectedChanged(viewHolder, actionState);
if (actionState == ItemTouchHelper.ACTION_STATE_DRAG) {
fireBaseRvAdapter.onStartDragging();
} else if (actionState == ItemTouchHelper.ACTION_STATE_IDLE) {
}
}
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
final int firstPosition = viewHolder.getAdapterPosition();
final int secondPosition = target.getAdapterPosition();
DatabaseReference firstItemRef = fireBaseRvAdapter.getRef(viewHolder.getAdapterPosition());
DatabaseReference secondItemRef = fireBaseRvAdapter.getRef(target.getAdapterPosition());
firstItemRef.child(FBdatabase.FIELD_ORDER).setValue(secondPosition);
secondItemRef.child(FBdatabase.FIELD_ORDER).setValue(firstPosition);
fireBaseRvAdapter.onItemMoved(firstPosition, secondPosition);
return true;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
}
@Override
public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
super.clearView(recyclerView, viewHolder);
fireBaseRvAdapter.onStopDragging();
}
};
のinit recyclerView追加します：
recycleListView = (RecyclerView) findViewById(R.id.list);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
recycleListView.setLayoutManager(layoutManager);
DefaultItemAnimator an = new DefaultItemAnimator();
recycleListView.setItemAnimator(an);
//Firebase
fb = new FBdatabase(); //Some firebase initialization here
fireBaseRvAdapter = new CustomFirebaseAdapter(
Record.class,
R.layout.list_item,
MyFireBaseRvAdapter.RecordViewHolderIns.class,
fb.getRef().orderByChild(FBdatabase.FIELD_ORDER)
);
fireBaseRvAdapter.setOnItemClickListener(this);
recycleListView.setAdapter(fireBaseRvAdapter);
//Firebase
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleCallback);
itemTouchHelper.attachToRecyclerView(recycleListView);
を持っていますあなたはこれに対する解決策を見つけましたか？ – AlexKost
私は自分のアダプターを書いた、それは私が言うことができるすべてです。今すぐコードを投稿することはできません – Evgeniy