在我的示例中，我有 Expandable recyclerview。对于recyclerview，每个项目都有复选框，就像我们点击父项目然后子列表将打开一样。父母和孩子都有复选框。如果我们单击父复选框，则带有复选框的子项目将打开并检查父项目。
我的问题是当用户单击父项复选框时，它将选中并且子列表将打开，但是如果用户选择该父项的任何子项，则应取消选中父复选框。
以下是我的代码。
主要活动：-
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
MyAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView=(RecyclerView)findViewById(R.id.main_recycler);
adapter=new MyAdapter(this);
adapter.setMode(ExpandableRecyclerAdapter.MODE_ACCORDION);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
}
}
我的适配器类：-
public class MyAdapter extends ExpandableRecyclerAdapter<MyAdapter.PeopleListItem> {
public static final int TYPE_PERSON = 1001;
public MyAdapter(Context context) {
super(context);
setItems(getSampleItems());
}
public class PeopleListItem extends ExpandableRecyclerAdapter.ListItem {
public String Text;
public PeopleListItem(String group) {
super(TYPE_HEADER);
Text = group;
}
public PeopleListItem(String first, String last) {
super(TYPE_PERSON);
Text = first + " " + last;
}
}
public class HeaderViewHolder extends ExpandableRecyclerAdapter.HeaderViewHolder {
TextView name;
CheckBox parent_check;
public HeaderViewHolder(View view) {
// super(view, (ImageView) view.findViewById(R.id.item_arrow));
super(view, (CheckBox) view.findViewById(R.id.parent_check));
parent_check=(CheckBox)view.findViewById(R.id.parent_check);
name = (TextView) view.findViewById(R.id.item_header_name);
}
public void bind(int position) {
super.bind(position);
name.setText(visibleItems.get(position).Text);
}
}
public class PersonViewHolder extends ExpandableRecyclerAdapter.ViewHolder {
TextView name;
CheckBox child_check;
public PersonViewHolder(View view) {
super(view);
name = (TextView) view.findViewById(R.id.item_name);
child_check=(CheckBox)view.findViewById(R.id.child_check);
}
public void bind(final int position) {
name.setText(visibleItems.get(position).Text);
child_check.setChecked(false);
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case TYPE_HEADER:
return new HeaderViewHolder(inflate(R.layout.parent_item, parent));
case TYPE_PERSON:
default:
return new PersonViewHolder(inflate(R.layout.child_item, parent));
}
}
@Override
public void onBindViewHolder(ExpandableRecyclerAdapter.ViewHolder holder, int position) {
switch (getItemViewType(position)) {
case TYPE_HEADER:
((HeaderViewHolder) holder).bind(position);
break;
case TYPE_PERSON:
default:
((PersonViewHolder) holder).bind(position);
break;
}
}
private List<PeopleListItem> getSampleItems() {
List<PeopleListItem> items = new ArrayList<>();
items.add(new PeopleListItem("Java"));
items.add(new PeopleListItem("Java","JDK Beta"));
items.add(new PeopleListItem("Java","JDK 1.0"));
items.add(new PeopleListItem("Java","JDK 1.1"));
items.add(new PeopleListItem("Java","JDK 1.2"));
items.add(new PeopleListItem("Java","JDK 1.3"));
items.add(new PeopleListItem("Java","JDK 1.4"));
items.add(new PeopleListItem("Java","JDK 1.5"));
items.add(new PeopleListItem("Java","JDK 1.6"));
items.add(new PeopleListItem("Java","JDK 1.7"));
items.add(new PeopleListItem("Java","JDK 1.8"));
items.add(new PeopleListItem("Android"));
items.add(new PeopleListItem("Cupcake","1.5"));
items.add(new PeopleListItem("Donut","1.6"));
items.add(new PeopleListItem("Eclair","2.0"));
items.add(new PeopleListItem("Froyo","2.2"));
items.add(new PeopleListItem("Gingerbread","2.3"));
items.add(new PeopleListItem("Honeycomb","3.0"));
items.add(new PeopleListItem("IceCreamSandwich","4.0"));
items.add(new PeopleListItem("Jellybean","4.1"));
items.add(new PeopleListItem("KitKat","4.4"));
items.add(new PeopleListItem("Lollipop","5.0"));
items.add(new PeopleListItem("Marshmallow","6.0"));
items.add(new PeopleListItem("Nougat","7.0"));
items.add(new PeopleListItem("DotNet"));
items.add(new PeopleListItem("FrameWork","1.0"));
items.add(new PeopleListItem("FrameWork","1.1"));
items.add(new PeopleListItem("FrameWork","2.0"));
items.add(new PeopleListItem("FrameWork","3.0"));
items.add(new PeopleListItem("FrameWork","4"));
items.add(new PeopleListItem("FrameWork","4.5"));
items.add(new PeopleListItem("FrameWork","4.5.1"));
items.add(new PeopleListItem("FrameWork","4.5.2"));
items.add(new PeopleListItem("FrameWork","4.6"));
items.add(new PeopleListItem("FrameWork","4.6.1"));
items.add(new PeopleListItem("FrameWork","4.6.2"));
return items:
}
}
ExpandableRecyclerAdapter 类：-
public abstract class ExpandableRecyclerAdapter<T extends ExpandableRecyclerAdapter.ListItem> extends RecyclerView.Adapter<ExpandableRecyclerAdapter.ViewHolder> {
protected Context mContext;
protected List<T> allItems = new ArrayList<>();
protected List<T> visibleItems = new ArrayList<>();
private List<Integer> indexList = new ArrayList<>();
private SparseIntArray expandMap = new SparseIntArray();
private int mode;
protected static final int TYPE_HEADER = 1000;
private static final int ARROW_ROTATION_DURATION = 150;
public static final int MODE_NORMAL = 0;
public static final int MODE_ACCORDION = 1;
public ExpandableRecyclerAdapter(Context context) {
mContext = context;
}
public static class ListItem {
public int ItemType;
public ListItem(int itemType) {
ItemType = itemType;
}
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public int getItemCount() {
return visibleItems == null ? 0 : visibleItems.size();
}
protected View inflate(int resourceID, ViewGroup viewGroup) {
return LayoutInflater.from(mContext).inflate(resourceID, viewGroup, false);
}
public class ViewHolder extends RecyclerView.ViewHolder {
public ViewHolder(View view) {
super(view);
}
}
public class HeaderViewHolder extends ViewHolder {
CheckBox arrow;
// ImageView arrow;
/* public HeaderViewHolder(View view, final ImageView arrow) {
super(view);
this.arrow = arrow;
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
handleClick();
}
});
}*/
public HeaderViewHolder(View view, final CheckBox arrow) {
super(view);
this.arrow = arrow;
arrow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
handleClick();
}
});
}
protected void handleClick() {
if (toggleExpandedItems(getLayoutPosition(), false)) {
// openArrow(arrow);
arrow.setChecked(true);
} else {
// closeArrow(arrow);
arrow.setChecked(false);
}
}
public void bind(int position) {
arrow.setChecked(isExpanded(position));
// arrow.setChecked(false);
/* arrow.setRotation(isExpanded(position) ? 90 : 0);*/
}
}
public boolean toggleExpandedItems(int position, boolean notify) {
if (isExpanded(position)) {
collapseItems(position, notify);
return false;
} else {
expandItems(position, notify);
if (mode == MODE_ACCORDION) {
collapseAllExcept(position);
}
return true;
}
}
public void expandItems(int position, boolean notify) {
int count = 0;
int index = indexList.get(position);
int insert = position;
for (int i=index+1; i<allItems.size() && allItems.get(i).ItemType != TYPE_HEADER; i++) {
insert++;
count++;
visibleItems.add(insert, allItems.get(i));
indexList.add(insert, i);
}
notifyItemRangeInserted(position + 1, count);
int allItemsPosition = indexList.get(position);
expandMap.put(allItemsPosition, 1);
if (notify) {
notifyItemChanged(position);
}
}
public void collapseItems(int position, boolean notify) {
int count = 0;
int index = indexList.get(position);
for (int i=index+1; i<allItems.size() && allItems.get(i).ItemType != TYPE_HEADER; i++) {
count++;
visibleItems.remove(position + 1);
indexList.remove(position + 1);
}
notifyItemRangeRemoved(position + 1, count);
int allItemsPosition = indexList.get(position);
expandMap.delete(allItemsPosition);
if (notify) {
notifyItemChanged(position);
}
}
public class StaticViewHolder extends ViewHolder {
public StaticViewHolder(View view) {
super(view);
}
}
public class ItemViewHolder extends ViewHolder {
public ItemViewHolder(View view) {
super(view);
}
}
protected boolean isExpanded(int position) {
int allItemsPosition = indexList.get(position);
return expandMap.get(allItemsPosition, -1) >= 0;
}
@Override
public int getItemViewType(int position) {
return visibleItems.get(position).ItemType;
}
public void setItems(List<T> items) {
allItems = items;
List<T> visibleItems = new ArrayList<>();
expandMap.clear();
indexList.clear();
for (int i=0; i<items.size(); i++) {
if (items.get(i).ItemType == TYPE_HEADER) {
indexList.add(i);
visibleItems.add(items.get(i));
}
}
this.visibleItems = visibleItems;
notifyDataSetChanged();
}
protected void notifyItemInserted(int allItemsPosition, int visiblePosition) {
incrementIndexList(allItemsPosition, visiblePosition, 1);
incrementExpandMapAfter(allItemsPosition, 1);
if (visiblePosition >= 0) {
notifyItemInserted(visiblePosition);
}
}
protected void removeItemAt(int visiblePosition) {
int allItemsPosition = indexList.get(visiblePosition);
allItems.remove(allItemsPosition);
visibleItems.remove(visiblePosition);
incrementIndexList(allItemsPosition, visiblePosition, -1);
incrementExpandMapAfter(allItemsPosition, -1);
notifyItemRemoved(visiblePosition);
}
private void incrementExpandMapAfter(int position, int direction) {
SparseIntArray newExpandMap = new SparseIntArray();
for (int i=0; i<expandMap.size(); i++) {
int index = expandMap.keyAt(i);
newExpandMap.put(index < position ? index : index + direction, 1);
}
expandMap = newExpandMap;
}
private void incrementIndexList(int allItemsPosition, int visiblePosition, int direction) {
List<Integer> newIndexList = new ArrayList<>();
for (int i=0; i<indexList.size(); i++) {
if (i == visiblePosition) {
if (direction > 0) {
newIndexList.add(allItemsPosition);
}
}
int val = indexList.get(i);
newIndexList.add(val < allItemsPosition ? val : val + direction);
}
indexList = newIndexList;
}
public void collapseAll() {
collapseAllExcept(-1);
}
public void collapseAllExcept(int position) {
for (int i=visibleItems.size()-1; i>=0; i--) {
if (i != position && getItemViewType(i) == TYPE_HEADER) {
if (isExpanded(i)) {
collapseItems(i, true);
}
}
}
}
public void expandAll() {
for (int i=visibleItems.size()-1; i>=0; i--) {
if (getItemViewType(i) == TYPE_HEADER) {
if (!isExpanded(i)) {
expandItems(i, true);
}
}
}
}
/*public static void openArrow(View view) {
((CheckBox) view).isChecked();
// view.animate().setDuration(ARROW_ROTATION_DURATION).rotation(90);
}
public static void closeArrow(View view) {
// view.animate().setDuration(ARROW_ROTATION_DURATION).rotation(0);
}*/
public int getMode() {
return mode;
}
public void setMode(int mode) {
this.mode = mode;
}
}
如果有人需要我可以提供的更多说明，这是我的代码。
在此示例中，如果用户单击第一个父项，则会显示该父子项并选中父复选框。我们可以选择任何子项甚至多个子项。
But my Problem is i want when child item is selected that parent checkbox get unchecked.user can able to check single check box.
我尝试实施，但我所有的尝试都没有成功。如果有人有任何想法帮助我。