私は下のスケッチのように動作するrecyclerviewを実装しようとしています:
アイデアは、親リストがあり、親リスト内のリストアイテムがタップされると、そのリストアイテムはそれ自身のデータを含む子リストを表示するというものです。リストアイテムが子リストでタップされると、その子の値が反映され、親リストアイテムの親の値が更新されます。
過去3日間、機能しないようにしようとしました。 AdvancedReyclerview library を使用してみましたが、私のような初心者にとっては、特にデータを渡す際に意味をなさない巨大な混乱でした。最小限の作業バージョンを取得するために必要なファイルをコピーして貼り付けましたが、データをrecyclerviewに渡す方法と、新しく選択した値でデータを更新する方法がわかりませんでした。
私がやろうとしていることをすることも可能ですか、ここで私の深さから外れていますか?
それでも理解が難しい場合は、さらに説明できます。
編集:誰かが私がRecyclerViewではなくExpandableListViewでこれを行うことをお勧めします。それについて何か考えはありますか?
1.ExpandableRecyclerAdapter.class
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 {
ImageView arrow;
public HeaderViewHolder(View view) {
super(view);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
toggleExpandedItems(getLayoutPosition(),false);
/*if(isExpanded(getLayoutPosition())){
collapseItems(getLayoutPosition(),false);
}else {
expandItems(getLayoutPosition(),true);
}*/
}
});
}
public HeaderViewHolder(View view, final ImageView 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);
} else {
closeArrow(arrow);
}
}
public void bind(int position) {
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);
}
}
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 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) {
view.animate().setDuration(ARROW_ROTATION_DURATION).rotation(180);
}
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;
}
}
2.activity_main
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:Android="http://schemas.Android.com/apk/res/Android"
Android:orientation="vertical"
Android:layout_width="match_parent"
Android:layout_height="match_parent">
<Android.support.v7.widget.RecyclerView Android:id="@+id/main_recycler"
Android:layout_width="match_parent"
Android:layout_height="match_parent" />
3.item_header
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:Android="http://schemas.Android.com/apk/res/Android"
xmlns:tools="http://schemas.Android.com/tools"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:orientation="horizontal"
Android:padding="@dimen/standard_padding">
<LinearLayout
Android:id="@+id/lnr_1"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:layout_centerHorizontal="true">
<TextView
Android:id="@+id/txt_header_address"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:drawableLeft="@mipmap/ic_usa"
Android:gravity="center"
Android:text="Beverly Hills"
Android:textStyle="bold" />
</LinearLayout>
<ImageView
Android:id="@+id/img_arrow"
Android:layout_width="@dimen/arrow_size"
Android:layout_height="@dimen/arrow_size"
Android:layout_alignParentRight="true"
Android:src="@mipmap/arrow" />
<TextView
Android:id="@+id/txt_header_name"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:layout_alignParentLeft="true"
Android:layout_alignParentStart="true"
Android:layout_centerVertical="true"
Android:text="Home"
Android:textStyle="bold" />
4.item_content.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:Android="http://schemas.Android.com/apk/res/Android"
xmlns:app="http://schemas.Android.com/apk/res-auto"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:orientation="vertical">
<RelativeLayout
Android:id="@+id/rcl_header_btn"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:orientation="horizontal">
<Button
style="?android:attr/borderlessButtonStyle"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:text="@string/btn_cancle" />
<Button
style="?android:attr/borderlessButtonStyle"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:layout_alignParentRight="true"
Android:text="@string/btn_save" />
</RelativeLayout>
<LinearLayout
Android:id="@+id/lnr_parent"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_below="@+id/rcl_header_btn"
Android:gravity="center_vertical"
Android:orientation="vertical">
<EditText
Android:id="@+id/edt_description"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:hint="DESCRIPTION" />
<EditText
Android:id="@+id/edt_address"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:hint="Address" />
<LinearLayout
Android:id="@+id/lnr_child_1"
Android:layout_width="match_parent"
Android:layout_height="wrap_content">
<EditText
Android:id="@+id/edt_city"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_weight="1"
Android:hint="City" />
<EditText
Android:id="@+id/edt_state"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_weight="1"
Android:hint="State" />
</LinearLayout>
<LinearLayout
Android:id="@+id/lnr_child_2"
Android:layout_width="match_parent"
Android:layout_height="wrap_content">
<EditText
Android:id="@+id/edt_zipcode"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_weight="1"
Android:hint="Zip Code" />
<EditText
Android:id="@+id/edt_country"
Android:layout_width="match_parent"
Android:layout_height="wrap_content"
Android:layout_weight="1"
Android:hint="Country" />
</LinearLayout>
</LinearLayout>
<RelativeLayout
Android:id="@+id/rcl_bottom"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:layout_below="@+id/lnr_parent">
<CheckBox
Android:id="@+id/chk_marked"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:layout_alignBaseline="@+id/txt_type" />
<TextView
Android:id="@+id/txt_type"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:layout_alignBaseline="@+id/btn_delete"
Android:layout_toRightOf="@+id/chk_marked"
Android:gravity="center"
Android:text="SET AS DEFAULT" />
<Button
Android:id="@+id/btn_delete"
Android:layout_width="wrap_content"
Android:layout_height="wrap_content"
Android:layout_alignParentRight="true"
Android:text="DELETE" />
</RelativeLayout>
5.アダプター
public class PeopleAdapter extends ExpandableRecyclerAdapter<PeopleAdapter.PeopleListItem> {
public static final int TYPE_PERSON = 1001;
public PeopleAdapter(Context context) {
super(context);
setItems(getSampleItems());
}
public static 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;
public HeaderViewHolder(View view) {
super(view, (ImageView) view.findViewById(R.id.img_arrow));
name = (TextView) view.findViewById(R.id.txt_header_name);
}
public void bind(int position) {
super.bind(position);
name.setText(visibleItems.get(position).Text);
}
}
public class PersonViewHolder extends ExpandableRecyclerAdapter.ViewHolder {
EditText name;
public PersonViewHolder(View view) {
super(view);
name = (EditText) view.findViewById(R.id.edt_description);
}
public void bind(int position) {
name.setText(name.getText());
}
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case TYPE_HEADER:
return new HeaderViewHolder(inflate(R.layout.item_header, parent));
case TYPE_PERSON:
default:
return new PersonViewHolder(inflate(R.layout.item_content, 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("Friends"));
items.add(new PeopleListItem("", ""));
items.add(new PeopleListItem("Friends"));
items.add(new PeopleListItem("", ""));
return items;
}
}
6.MainActivity.Java
public class MainActivity extends AppCompatActivity {
RecyclerView recycler;
PeopleAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
recycler = (RecyclerView) findViewById(R.id.main_recycler);
adapter = new PeopleAdapter(this);
adapter.setMode(ExpandableRecyclerAdapter.MODE_ACCORDION);
recycler.setLayoutManager(new LinearLayoutManager(this));
recycler.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_expand_all:
adapter.expandAll();
return true;
case R.id.action_collapse_all:
adapter.collapseAll();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
ライブラリは here で確認できます
そして、以下のようなコードを作成します:
public class PurchaseItemRecyclerViewAdapter extends ExpandableRecyclerView.Adapter<PurchaseItemRecyclerViewAdapter.ChildViewHolder,ExpandableRecyclerView.SimpleGroupViewHolder,String,String>
{
List<ItemModel> itemModels;
public PurchaseItemRecyclerViewAdapter() {
this.itemModels = new ArrayList<>();
itemModels.add(new ItemModel("group 0",3,"subitem :"));
itemModels.add(new ItemModel("group 1",3,"subitem :"));
itemModels.add(new ItemModel("group 2",2,"subitem :"));
itemModels.add(new ItemModel("group 3",1,"subitem :"));
itemModels.add(new ItemModel("group 4",3,"subitem :"));
itemModels.add(new ItemModel("group 5",5,"subitem :"));
}
@Override
public int getGroupItemCount() {
return itemModels.size();
}
@Override
public int getChildItemCount(int i) {
return itemModels.get(i).getSubItemCount();
}
@Override
public String getGroupItem(int i) {
return itemModels.get(i).getParentName();
}
@Override
public String getChildItem(int group, int child) {
return itemModels.get(group).getSubItemPrefix() + child;
}
@Override
protected ExpandableRecyclerView.SimpleGroupViewHolder onCreateGroupViewHolder(ViewGroup parent)
{
return new ExpandableRecyclerView.SimpleGroupViewHolder(parent.getContext());
}
@Override
protected ChildViewHolder onCreateChildViewHolder(ViewGroup parent, int viewType)
{
View rootView = LayoutInflater.from(parent.getContext()).inflate(R.layout.purchase_list_content,parent,false);
return new ChildViewHolder(rootView);
}
@Override
public void onBindGroupViewHolder(ExpandableRecyclerView.SimpleGroupViewHolder holder, int group) {
super.onBindGroupViewHolder(holder, group);
holder.setText(getGroupItem(group));
}
@Override
public void onBindChildViewHolder(ChildViewHolder holder, final int group, int position)
{
super.onBindChildViewHolder(holder, group, position);
holder.name.setText(getChildItem(group, position));
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
itemModels.get(group).setParentName("edited Parent");
notifyItemChanged(group);
}
});
}
@Override
public int getChildItemViewType(int i, int i1) {
return 1;
}
public class ChildViewHolder extends RecyclerView.ViewHolder
{
private TextView name;
public ChildViewHolder(View itemView) {
super(itemView);
name = (TextView) itemView.findViewById(R.id.item_name);
}
}
}
このItemModelクラス:
public class ItemModel {
String parentName;
int subItemCount;
String subItemPrefix;
public ItemModel(String parentName, int subItemCount, String subItemPrefix) {
this.parentName = parentName;
this.subItemCount = subItemCount;
this.subItemPrefix = subItemPrefix;
}
public String getParentName() {
return parentName;
}
public void setParentName(String parentName) {
this.parentName = parentName;
}
public int getSubItemCount() {
return subItemCount;
}
public void setSubItemCount(int subItemCount) {
this.subItemCount = subItemCount;
}
public String getSubItemPrefix() {
return subItemPrefix;
}
public void setSubItemPrefix(String subItemPrefix) {
this.subItemPrefix = subItemPrefix;
}
}
library で簡単に実現できます。完全な例 here があります。
基本的に、アイテムをセクションにグループ化します:
class MySection extends StatelessSection {
String header;
List<String> list;
boolean expanded = true;
public MySection(String header, List<String> list) {
// call constructor with layout resources for this Section header and items
super(R.layout.section_header, R.layout.section_item);
this.myHeader = header;
this.myList = list;
}
@Override
public int getContentItemsTotal() {
return expanded? list.size() : 0;
}
@Override
public RecyclerView.ViewHolder getHeaderViewHolder(View view) {
return new HeaderViewHolder(view);
}
@Override
public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder) {
final HeaderViewHolder headerHolder = (HeaderViewHolder) holder;
headerHolder.tvTitle.setText(title);
headerHolder.rootView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
expanded = !expanded;
headerHolder.imgArrow.setImageResource(
expanded ? R.drawable.ic_keyboard_arrow_up_black_18dp : R.drawable.ic_keyboard_arrow_down_black_18dp
);
sectionAdapter.notifyDataSetChanged();
}
});
}
@Override
public RecyclerView.ViewHolder getItemViewHolder(View view) {
// return a custom instance of ViewHolder for the items of this section
return new MyItemViewHolder(view);
}
@Override
public void onBindItemViewHolder(RecyclerView.ViewHolder holder, int position) {
MyItemViewHolder itemHolder = (MyItemViewHolder) holder;
// bind your view here
itemHolder.tvItem.setText(list.get(position));
}
}
次に、セクションのインスタンスを作成し、アダプターをセットアップします。
// Create an instance of SectionedRecyclerViewAdapter
SectionedRecyclerViewAdapter sectionAdapter = new SectionedRecyclerViewAdapter();
// Add your Sections
sectionAdapter.addSection(new MySection("A", Arrays.asList(new String[] {"a", "b", "c" })));
sectionAdapter.addSection(new MySection("B", Arrays.asList(new String[] {"d", "e", "f" })));
// Set up your RecyclerView with the SectionedRecyclerViewAdapter
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerView.setAdapter(sectionAdapter);
これは少し遅れていますが、この高度なrecyclerviewライブラリをご覧ください https://github.com/h6ah4i/Android-advancedrecyclerview
ドキュメントでは、拡張可能なアイテムに関連するクラス/インターフェースを確認できます。