这是我的ExpandableRecyclerAdapter适配器
public class MyAdapter extends ExpandableRecyclerAdapter<MyAdapter.ProductParentViewHolder, MyAdapter.ProductChildViewHolder> {
private LayoutInflater mInflater;
private Context context;
private List<? extends ParentListItem> mParentItemList;
public MyAdapter(Context context, List<ParentListItem> itemList) {
super(itemList);
mInflater = LayoutInflater.from(context);
this.context = context;
this.mParentItemList = itemList;
}
@Override
public ProductParentViewHolder onCreateParentViewHolder(ViewGroup viewGroup) {
View view = mInflater.inflate(R.layout.list_item_crime_parent, viewGroup, false);
return new ProductParentViewHolder(view);
}
@Override
public ProductChildViewHolder onCreateChildViewHolder(ViewGroup viewGroup) {
View view = mInflater.inflate(R.layout.list_item_crime_child, viewGroup, false);
return new ProductChildViewHolder(view);
}
@Override
public void onBindParentViewHolder(ProductParentViewHolder crimeParentViewHolder, int i, ParentListItem parentListItem) {
Product product = (Product) parentListItem;
crimeParentViewHolder.productName.setText(product.getBrandName() + " " + product.getProductName());
Glide.with(context)
.load(product.getProductImagePath())
.placeholder(R.drawable.placeholder)
.error(R.drawable.placeholder)
.into(crimeParentViewHolder.thumbnail);
}
@Override
public void onBindChildViewHolder(ProductChildViewHolder productChildViewHolder, int i, Object childListItem) {
final ProductVariant productVariant = (ProductVariant) childListItem;
productChildViewHolder.mCrimeDateText.setText(productVariant.getVariantName());
productChildViewHolder.variantMrp.setText(context.getString(R.string.positive_amount, productVariant.getMRP()));
productChildViewHolder.variantMrp.setPaintFlags(productChildViewHolder.variantMrp.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
productChildViewHolder.variantSellPrice.setText(context.getString(R.string.positive_amount, productVariant.getSellPrice()));
//productChildViewHolder.variantMrp.setText(productVariant.getMRP().toString());
//productChildViewHolder.variantSellPrice.setText(productVariant.getSellPrice().toString());
if (productVariant.getInCart() == 0) {
productChildViewHolder.btnProductDetailAddToCart.setVisibility(View.VISIBLE);
productChildViewHolder.btnProductDetailMinus.setVisibility(View.GONE);
productChildViewHolder.btnProductDetailQty.setVisibility(View.GONE);
productChildViewHolder.btnProductDetailPlus.setVisibility(View.GONE);
} else {
productChildViewHolder.btnProductDetailAddToCart.setVisibility(View.GONE);
productChildViewHolder.btnProductDetailMinus.setVisibility(View.VISIBLE);
productChildViewHolder.btnProductDetailQty.setVisibility(View.VISIBLE);
productChildViewHolder.btnProductDetailPlus.setVisibility(View.VISIBLE);
}
int quantity = productVariant.getInCart();
productChildViewHolder.btnProductDetailQty.setText(Integer.toString(quantity));
productChildViewHolder.btnProductDetailAddToCart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
productVariant.setInCart(1);
//Utility.loadShoppingCartItems();
notifyDataSetChanged();
invalidateOptionsMenu();
//holder.db.addItem(new CartItem(1, productVariant.getProductID(), productVariant.getVariantID(), 1));
}
});
productChildViewHolder.btnProductDetailPlus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
productVariant.setInCart(1 + productVariant.getInCart());
notifyDataSetChanged();
invalidateOptionsMenu();
//if (productVariant.getInCart() > 0) {
//int count = holder.db.updateSingleRow(productVariant.getProductID(), productVariant.getVariantID(), productVariant.getInCart());
//}
}
});
productChildViewHolder.btnProductDetailMinus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
productVariant.setInCart(productVariant.getInCart() - 1);
notifyDataSetChanged();
invalidateOptionsMenu();
if (productVariant.getInCart() == 0) {
//int count = holder.db.deleteSingleRow(productVariant.getProductID(), productVariant.getVariantID());
} else if (productVariant.getInCart() > 0) {
//int count = holder.db.updateSingleRow(productVariant.getProductID(), productVariant.getVariantID(), productVariant.getInCart());
}
//Utility.displayToast(holder.db.getItemsCount() + "");
}
});
//crimeChildViewHolder.mCrimeSolvedCheckBox.setChecked(productVariant.isSolved());
}
public class ProductParentViewHolder extends ParentViewHolder {
private static final float INITIAL_POSITION = 0.0f;
private static final float ROTATED_POSITION = 180f;
private final boolean HONEYCOMB_AND_ABOVE = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB;
public TextView productName;
public ImageView thumbnail;
public ImageButton mParentDropDownArrow;
public ProductParentViewHolder(View itemView) {
super(itemView);
productName = (TextView) itemView.findViewById(R.id.productName);
thumbnail = (ImageView) itemView.findViewById(R.id.thumbnail);
// mParentDropDownArrow = (ImageButton) itemView.findViewById(R.id.parent_list_item_expand_arrow);
}
@SuppressLint("NewApi")
@Override
public void setExpanded(boolean expanded) {
super.setExpanded(expanded);
if (!HONEYCOMB_AND_ABOVE) {
return;
}
if (expanded) {
// mParentDropDownArrow.setRotation(ROTATED_POSITION);
} else {
// mParentDropDownArrow.setRotation(INITIAL_POSITION);
}
}
}
public class ProductChildViewHolder extends ChildViewHolder {
public TextView mCrimeDateText;
public TextView variantMrp;
public TextView variantSellPrice;
public Button btnProductDetailAddToCart, btnProductDetailPlus, btnProductDetailMinus;
public TextView btnProductDetailQty;
public ProductChildViewHolder(View itemView) {
super(itemView);
mCrimeDateText = (TextView) itemView.findViewById(R.id.variantName);
variantMrp = (TextView) itemView.findViewById(R.id.productVariantMrp);
variantSellPrice = (TextView) itemView.findViewById(R.id.productVariantSellPrice);
btnProductDetailAddToCart = (Button) itemView.findViewById(R.id.btnProductDetailAddToCart);
btnProductDetailPlus = (Button) itemView.findViewById(R.id.btnProductDetailPlus);
btnProductDetailMinus = (Button) itemView.findViewById(R.id.btnProductDetailMinus);
btnProductDetailQty = (TextView) itemView.findViewById(R.id.btnProductDetailQty);
}
}
}
当我在页面底部并单击项目时，它会展开，但是exapnded子项目不会显示给用户，因为它在屏幕底部。
我想在屏幕上移动该项目并向用户显示扩展项目。
我该怎么做？
答案 0 :(得分：1)
您只需使用方法setSelectedGroup()
expandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
expandableListView.setSelectedGroup(groupPosition);
return true;
}
});
这会将所选组移至顶部
修改 最后，我还为您的ExpandableRecyclerAdapter提供了解决方案。只需将此方法放在适配器实现中即可。此外，您还需要在适配器内引用recyclerView，您可以在初始化时将其传递给适配器。
int lastPos = -1;
@Override
public void onParentListItemExpanded(int position) {
List<? extends ParentListItem> parentItemList = this.getParentItemList();
collapseAllParents();
int finalPos = position;
if (lastPos != -1 && lastPos < position) {
finalPos = position - parentItemList.get(lastPos).getChildItemList().size();
}
expandParent(finalPos);
mRecyclerView.smoothScrollToPosition(finalPos);
lastPos = position;
}
我在https://github.com/bignerdranch/expandable-recycler-view/issues/156找到了这个问题。虽然那里的解决方案没有奏效。稍作调整即可使其发挥作用。
答案 1 :(得分：0)
在展开式listview点击监听器中使用以下代码。做点事情
yourExpandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
public boolean onGroupClick(final ExpandableListView parent, View v, final int groupPosition, long id) {
....
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
parent.smoothScrollToPositionFromTop(groupPosition + 1, 0);
}
},100);
....
return true;
}
});
答案 2 :(得分：0)