Tampilan pohon RecyclerView (tanpa perpustakaan pihak ketiga dan array anak)

dependencies { implementation 'com.android.support:appcompat-v7:26.1.0' implementation 'com.android.support:design:26.1.0' implementation 'com.android.support:recyclerview-v7:26.1.0' } 

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <android.support.v7.widget.RecyclerView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/recycler_list"> </android.support.v7.widget.RecyclerView> </RelativeLayout> 

 public final class Data { private String valueText = ""; //  private int valueId = 0; //  private boolean itemParent = false; //    private int parentId = -1; //id ,    private boolean childVisibility = false; //   //     public boolean isItemParent() { return itemParent; } //    public void setItemParent(boolean newItemParent) { itemParent = newItemParent; } //    public boolean isChildVisibility() { return childVisibility; } //     public void setChildVisibility(boolean newChildVisibility) { childVisibility = newChildVisibility; } //    public int getParentId() { return parentId; } //    public void setParentId(int newParentId) { parentId = newParentId; } //   public String getValueText() { return valueText; } //   public void setValueText(String newValueText) { valueText = newValueText; } //   public int getValueId() { return valueId; } //   public void setValueId(int newValueId) { valueId = newValueId; } } 

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/item" android:layout_width="match_parent" android:layout_height="wrap_content"> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent"> <!--     --> <android.support.v7.widget.AppCompatImageView android:id="@+id/icon_tree" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/icon_hide" android:visibility="gone" app:backgroundTint="@color/colorPrimary" android:layout_centerVertical="true"/> <LinearLayout android:id="@+id/block_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_toRightOf="@+id/icon_tree"> <!--  --> <TextView android:id="@+id/value_name" android:layout_width="match_parent" android:layout_height="wrap_content" android:foreground="?android:attr/selectableItemBackground" android:text="sdfdsf"/> </LinearLayout> <!--  --> <View android:layout_width="match_parent" android:layout_height="1dp" android:background="@color/colorPrimary" android:layout_below="@+id/block_text" android:layout_marginTop="4dp" android:layout_marginLeft="4dp" android:layout_marginRight="4dp"/> </RelativeLayout> </LinearLayout> 

 public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> { private View vv; private List<Data> allRecords; //   public RecyclerViewAdapter(List<Data> records) { allRecords = records; } @Override public RecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) { View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false); return new RecyclerViewAdapter.ViewHolder(v); } @Override public void onBindViewHolder(final RecyclerViewAdapter.ViewHolder viewHolder, int i) { Data record = allRecords.get(i); String value = record.getValueText(); int id = record.getValueId(); int parentId = record.getParentId(); final int position = i; final String text = "#" + id + ": " + value + " (id  : " + parentId + ")"; //   ,    if (parentId >= 0) { //      setVisibility(viewHolder.item, allRecords.get(parentId).isChildVisibility(), parentId); } else { //  ,   setVisibility(viewHolder.item, true, parentId); } //      if (record.isItemParent()) { viewHolder.iconTree.setVisibility(View.VISIBLE); //   if (record.isChildVisibility()) //   viewHolder.iconTree.setBackgroundResource(R.drawable.icon_show); else //   viewHolder.iconTree.setBackgroundResource(R.drawable.icon_hide); } else //   viewHolder.iconTree.setVisibility(View.GONE); //   if (!TextUtils.isEmpty(value)) { viewHolder.valueText.setText(value); } //     viewHolder.valueText.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Data dataItem = allRecords.get(position); if (dataItem.isItemParent()) { //   ,     dataItem.setChildVisibility(!dataItem.isChildVisibility()); notifyDataSetChanged(); } else { //   ,    Snackbar snackbar = Snackbar.make(vv, text, Snackbar.LENGTH_LONG); snackbar.show(); } } }); } //   private void setVisibility(View curV, boolean visible, int parentId) { // ,      LinearLayout vPadding = curV.findViewById(R.id.block_text); LinearLayout.LayoutParams params; if (visible) { params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT); if (vPadding != null) { if (parentId >= 0) { //  ,   vPadding.setPadding(80, 0, 0, 0); } else { vPadding.setPadding(0, 0, 0, 0); } } } else params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 0); curV.setLayoutParams(params); } @Override public int getItemCount() { return allRecords.size(); } class ViewHolder extends RecyclerView.ViewHolder { private LinearLayout item; private TextView valueText; private AppCompatImageView iconTree; public ViewHolder(View itemView) { super(itemView); vv = itemView; item = vv.findViewById(R.id.id_item); valueText = vv.findViewById(R.id.value_name); iconTree = vv.findViewById(R.id.icon_tree); } } } 

 List<Data> records = new ArrayList<Data>(); //  Data record; RecyclerViewAdapter adapter; int parentId; RecyclerView recyclerView = findViewById(R.id.recycler_list); record = new Data(); record.setValueId(1); record.setValueText("  1"); record.setItemParent(true); //  records.add(record); parentId = records.size() -1; for (int ind = 1; ind <= 3; ind ++) { record = new Data(); record.setValueId(ind); record.setValueText(" " + ind); record.setParentId(parentId); records.add(record); } record = new Data(); record.setValueId(1); record.setValueText("  "); record.setItemParent(true); //  records.add(record); parentId = records.size() -1; for (int ind = 4; ind <= 7; ind ++) { record = new Data(); record.setValueId(ind); record.setValueText("  " + ind); record.setParentId(parentId); records.add(record); } record = new Data(); record.setValueId(1); record.setValueText("  "); record.setItemParent(true); //  records.add(record); parentId = records.size() -1; for (int ind = 8; ind <= 12; ind ++) { record = new Data(); record.setValueId(ind); record.setValueText(" " + ind); record.setParentId(parentId); records.add(record); } for (int ind = 13; ind <= 18; ind ++) { record = new Data(); record.setValueId(ind); record.setValueText("  " + ind); records.add(record); } for (int ind = 19; ind <= 21; ind ++) { record = new Data(); record.setValueId(ind); record.setValueText("   " + ind); records.add(record); } record = new Data(); record.setValueId(1); record.setValueText("  "); record.setItemParent(true); //  records.add(record); parentId = records.size() -1; for (int ind = 22; ind <= 30; ind ++) { record = new Data(); record.setValueId(ind); record.setValueText(": " + ind); record.setParentId(parentId); records.add(record); } for (int ind = 31; ind <= 45; ind ++) { record = new Data(); record.setValueId(ind); record.setValueText("   " + ind); records.add(record); } adapter = new RecyclerViewAdapter(records); RecyclerView.ItemAnimator itemAnimator = new DefaultItemAnimator(); LinearLayoutManager layoutManager = new LinearLayoutManager(this); recyclerView.setAdapter(adapter); recyclerView.setLayoutManager(layoutManager); recyclerView.setItemAnimator(itemAnimator);