Utilisez ceci pour sélectionner plusieurs lignes dans recyclerview et supprimer avec actionmode.
SelectableAdapter.class
public abstract class SelectableAdapter<VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<VH> {
@SuppressWarnings("unused")
private static final String TAG = SelectableAdapter.class.getSimpleName();
private SparseBooleanArray selectedItems;
public SelectableAdapter() {
selectedItems = new SparseBooleanArray();
}
/**
* Indicates if the item at position position is selected
* @param position Position of the item to check
* @return true if the item is selected, false otherwise
*/
public boolean isSelected(int position) {
return getSelectedItems().contains(position);
}
/**
* Toggle the selection status of the item at a given position
* @param position Position of the item to toggle the selection status for
*/
public void toggleSelection(int position) {
if (selectedItems.get(position, false)) {
selectedItems.delete(position);
} else {
selectedItems.put(position, true);
}
notifyItemChanged(position);
}
/**
* Clear the selection status for all items
*/
public void clearSelection() {
List<Integer> selection = getSelectedItems();
selectedItems.clear();
for (Integer i : selection) {
notifyItemChanged(i);
}
}
/**
* Count the selected items
* @return Selected items count
*/
public int getSelectedItemCount() {
return selectedItems.size();
}
/**
* Indicates the list of selected items
* @return List of selected items ids
*/
public List<Integer> getSelectedItems() {
List<Integer> items = new ArrayList<>(selectedItems.size());
for (int i = 0; i < selectedItems.size(); ++i) {
items.add(selectedItems.keyAt(i));
}
return items;
}
}
Item.class
public class Item {
private String title;
public Item(String title){
this.title=title;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
Adapter.class
public class Adapter extends SelectableAdapter<Adapter.ViewHolder> {
@SuppressWarnings("unused")
private static final String TAG = Adapter.class.getSimpleName();
private static final int ITEM_COUNT = 50;
private List<Item> items;
private ViewHolder.ClickListener clickListener;
public Adapter(ViewHolder.ClickListener clickListener) {
super();
this.clickListener = clickListener;
items = new ArrayList<>();
for (int i = 0; i < ITEM_COUNT; ++i) {
items.add(new Item("Item " + i));
}
}
public void removeItem(int position) {
items.remove(position);
notifyItemRemoved(position);
}
public void removeItems(List<Integer> positions) {
// Reverse-sort the list
Collections.sort(positions, new Comparator<Integer>() {
@Override
public int compare(Integer lhs, Integer rhs) {
return rhs - lhs;
}
});
// Split the list in ranges
while (!positions.isEmpty()) {
if (positions.size() == 1) {
removeItem(positions.get(0));
positions.remove(0);
} else {
int count = 1;
while (positions.size() > count && positions.get(count).equals(positions.get(count - 1) - 1)) {
++count;
}
if (count == 1) {
removeItem(positions.get(0));
} else {
removeRange(positions.get(count - 1), count);
}
for (int i = 0; i < count; ++i) {
positions.remove(0);
}
}
}
}
private void removeRange(int positionStart, int itemCount) {
for (int i = 0; i < itemCount; ++i) {
items.remove(positionStart);
}
notifyItemRangeRemoved(positionStart, itemCount);
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_card, parent, false);
return new ViewHolder(v, clickListener);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
final Item item = items.get(position);
holder.title.setText(item.getTitle());
// Highlight the item if it's selected
holder.selectedOverlay.setVisibility(isSelected(position) ? View.VISIBLE : View.INVISIBLE);
}
@Override
public int getItemCount() {
return items.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener,
View.OnLongClickListener {
@SuppressWarnings("unused")
private static final String TAG = ViewHolder.class.getSimpleName();
TextView title;
TextView subtitle;
View selectedOverlay;
private ClickListener listener;
public ViewHolder(View itemView, ClickListener listener) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.textView);
selectedOverlay = (View)itemView.findViewById(R.id.selectedOverlay);
this.listener = listener;
itemView.setOnClickListener(this);
itemView.setOnLongClickListener(this);
}
@Override
public void onClick(View v) {
if (listener != null) {
listener.onItemClicked(getLayoutPosition());
}
}
@Override
public boolean onLongClick(View v) {
if (listener != null) {
return listener.onItemLongClicked(getLayoutPosition());
}
return false;
}
public interface ClickListener {
void onItemClicked(int position);
boolean onItemLongClicked(int position);
}
}
}
MainActivity.class
public class MainActivity extends AppCompatActivity implements Adapter.ViewHolder.ClickListener {
@SuppressWarnings("unused")
private static final String TAG = MainActivity.class.getSimpleName();
private Adapter adapter;
private ActionModeCallback actionModeCallback = new ActionModeCallback();
private ActionMode actionMode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
adapter = new Adapter(this);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setAdapter(adapter);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setLayoutManager(new GridLayoutManager(this,3));
}
@Override
public void onItemClicked(int position) {
if (actionMode != null) {
toggleSelection(position);
} else {
//adapter.removeItem(position);
}
}
@Override
public boolean onItemLongClicked(int position) {
if (actionMode == null) {
actionMode = startSupportActionMode(actionModeCallback);
}
toggleSelection(position);
return true;
}
/**
* Toggle the selection state of an item.
*
* If the item was the last one in the selection and is unselected, the selection is stopped.
* Note that the selection must already be started (actionMode must not be null).
*
* @param position Position of the item to toggle the selection state
*/
private void toggleSelection(int position) {
adapter.toggleSelection(position);
int count = adapter.getSelectedItemCount();
if (count == 0) {
actionMode.finish();
} else {
actionMode.setTitle(String.valueOf(count));
actionMode.invalidate();
}
}
private class ActionModeCallback implements ActionMode.Callback {
@SuppressWarnings("unused")
private final String TAG = ActionModeCallback.class.getSimpleName();
@Override
public boolean onCreateActionMode(ActionMode mode, Menu menu) {
mode.getMenuInflater().inflate (R.menu.toolbar_menu, menu);
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
return false;
}
@Override
public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
switch (item.getItemId()) {
case R.id.action_delete:
adapter.removeItems(adapter.getSelectedItems());
mode.finish();
return true;
default:
return false;
}
}
@Override
public void onDestroyActionMode(ActionMode mode) {
adapter.clearSelection();
actionMode = null;
}
}
}
item_card.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.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:foreground="?android:attr/selectableItemBackground"
app:cardUseCompatPadding="true">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="8dp"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="@+id/textView"
android:padding="7dp"
android:text="sample"/>
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="match_parent"
android:visibility="invisible"
android:id="@+id/selectedOverlay"
android:background="@color/transparent"/>
</android.support.v7.widget.CardView>
