added library files

Author: 최인탁

.idea/misc.xml

@@ -29,5 +29,6 @@ dependencies {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
     compile 'com.android.support:appcompat-v7:25.1.0'
+    compile 'com.android.support:recyclerview-v7:25.1.0'
     testCompile 'junit:junit:4.12'
 }

library/build.gradle

@@ -0,0 +1,11 @@
+package com.choiintack.recursiverecyclerview;
+
+import java.util.List;
+
+/**
+ * Created by choiintack on 2017. 1. 31..
+ */
+
+public interface RecursiveItem {
+    List getChildren();
+}

library/src/main/java/com/choiintack/recursiverecyclerview/RecursiveItem.java

@@ -0,0 +1,28 @@
+package com.choiintack.recursiverecyclerview;
+
+/**
+ * Created by choiintack on 2017. 1. 31..
+ */
+
+public class RecursiveItemSet {
+    int depth;
+    boolean expanded;
+    Object item;
+
+    public RecursiveItemSet(Object item, boolean expanded, int depth) {
+        this.item = item;
+        this.expanded = expanded;
+        this.depth = depth;
+    }
+
+    public int getDepth() {
+        return depth;
+    }
+    public boolean isExpanded() {
+        return expanded;
+    }
+    public Object getItem() {
+        return item;
+    }
+
+}

library/src/main/java/com/choiintack/recursiverecyclerview/RecursiveItemSet.java

@@ -0,0 +1,91 @@
+package com.choiintack.recursiverecyclerview;
+
+import android.support.v7.widget.RecyclerView;
+import android.view.View;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created by choiintack on 2017. 1. 31..
+ */
+
+public abstract class RecursiveRecyclerAdapter<VH extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<VH> {
+
+    List<RecursiveItemSet> mItems = new ArrayList<>();
+
+    public void setItems(List items) {
+        for (Object item : items) {
+            mItems.add(new RecursiveItemSet(
+                    item, false, 0
+            ));
+        }
+    }
+
+    public Object getItem(int position) {
+        return mItems.get(position).getItem();
+    }
+
+    @Override
+    public void onBindViewHolder(VH holder, final int position) {
+        if (getItem(position) instanceof RecursiveItem) {
+            final RecursiveItem item = (RecursiveItem) getItem(position);
+            final Object _item = mItems.get(position);
+            holder.itemView.setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    if (expanded(_item)) {
+                        removeItems(_item, item.getChildren());
+                    } else {
+                        addItems(_item, item.getChildren());
+                    }
+                }
+            });
+        }
+    }
+
+    @Override
+    public int getItemCount() {
+        return mItems.size();
+    }
+
+    @Override
+    public int getItemViewType(int position) {
+        return mItems.get(position).getDepth();
+    }
+
+    public boolean expanded(Object item) {
+        int position =  mItems.indexOf(item);
+        return mItems.get(position).isExpanded();
+    }
+
+    public void addItems(Object parent, List items) {
+        int position = mItems.indexOf(parent);
+        for (int i = 0; i < items.size(); i ++) {
+            Object item = items.get(i);
+            mItems.add(position + 1 + i, new RecursiveItemSet(
+                    item, false, mItems.get(position).getDepth() + 1
+            ));
+        }
+        mItems.get(position).expanded = true;
+        notifyItemRangeInserted(position + 1, items.size());
+        notifyItemChanged(position);
+    }
+
+    public void removeItems(Object parent, List items) {
+        int position = mItems.indexOf(parent);
+        for (int i = 0; i < items.size(); i ++) {
+            if (getItem(position + 1) instanceof RecursiveItem) {
+                if (expanded(mItems.get(position + 1))) {
+                    RecursiveItem item = (RecursiveItem) getItem(position + 1);
+                    removeItems(mItems.get(position + 1), item.getChildren());
+                }
+            }
+            mItems.remove(position + 1);
+        }
+        mItems.get(position).expanded = false;
+        notifyItemRangeRemoved(position  + 1, items.size());
+        notifyItemChanged(position);
+    }
+
+}

library/src/main/java/com/choiintack/recursiverecyclerview/RecursiveRecyclerAdapter.java

@@ -4,7 +4,7 @@ android {
     compileSdkVersion 25
     buildToolsVersion "25.0.2"
     defaultConfig {
-        applicationId "com.choiintack.recursiverecyclerview"
+        applicationId "com.choiintack.recursiverecyclerviewdemo"
         minSdkVersion 9
         targetSdkVersion 25
         versionCode 1
@@ -25,5 +25,6 @@ dependencies {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
     compile 'com.android.support:appcompat-v7:25.1.0'
+    compile project(':library')
     testCompile 'junit:junit:4.12'
 }

sampleapp/build.gradle

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.choiintack.recursiverecyclerview">
+    package="com.choiintack.recursiverecyclerviewdemo">
 
     <application
         android:allowBackup="true"