Update ExpandableListViewAdapter.java

app/src/main/java/com/example/musicplayer/adapter/ExpandableListViewAdapter.java

@@ -17,64 +17,80 @@ import com.example.musicplayer.util.CommonUtil;
 import java.util.List;
 
 /**
- * 自建歌单和收藏歌单的二级适配类
+ * 自建歌单和收藏歌单的二级适配类。
  * Created by 残渊 on 2018/9/23.
  */
 public class ExpandableListViewAdapter extends BaseExpandableListAdapter {
     private static final String TAG = "ExpandableListViewAdapter";
 
-    private String[] mGroupStrings;  //一级标题
-    private List<List<AlbumCollection>> mAlbumCollectionList; //二级收藏歌单列表
-    private Context mContext;
-    private OnChildItemClickListener mChildClickListener; //二级item的点击监听
-
-
+    private String[] mGroupStrings;  // 一级标题数组
+    private List<List<AlbumCollection>> mAlbumCollectionList; // 二级歌单列表
+    private Context mContext; // 上下文环境
+    private OnChildItemClickListener mChildClickListener; // 二级项的点击监听器
+
+    /**
+     * 构造函数，初始化适配器。
+     * @param context 上下文环境
+     * @param groupStrings 一级标题数组
+     * @param albumCollectionList 二级歌单列表
+     */
     public ExpandableListViewAdapter(Context context, String[] groupStrings, List<List<AlbumCollection>> albumCollectionList) {
         mAlbumCollectionList = albumCollectionList;
         mGroupStrings = groupStrings;
         mContext = context;
     }
-    //提供给外部使用
-    public  void setOnChildItemClickListener(OnChildItemClickListener onChildItemClickListener){
-        mChildClickListener=onChildItemClickListener;
+
+    /**
+     * 设置二级项的点击监听器。
+     * @param onChildItemClickListener 点击监听器
+     */
+    public void setOnChildItemClickListener(OnChildItemClickListener onChildItemClickListener){
+        mChildClickListener = onChildItemClickListener;
     }
 
+    // 获取一级列表的组数
     @Override
     public int getGroupCount() {
         return mGroupStrings.length;
     }
 
+    // 获取指定组的子项数
     @Override
     public int getChildrenCount(int groupPosition) {
         return mAlbumCollectionList.get(groupPosition).size();
     }
 
+    // 获取指定组的对象
     @Override
     public Object getGroup(int groupPosition) {
         return mGroupStrings[groupPosition];
     }
 
+    // 获取指定子项的对象
     @Override
     public Object getChild(int groupPosition, int childPosition) {
         return mAlbumCollectionList.get(groupPosition).get(childPosition);
     }
 
+    // 获取指定组的ID
     @Override
     public long getGroupId(int groupPosition) {
         return groupPosition;
     }
 
+    // 获取指定子项的ID
     @Override
     public long getChildId(int groupPosition, int childPosition) {
         return childPosition;
     }
 
+    // 是否有稳定的ID
     @Override
     public boolean hasStableIds() {
         return true;
     }
 
-    //绘制一级列表
+    // 绘制一级列表项
     @Override
     public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
         View view;
@@ -90,7 +106,7 @@ public class ExpandableListViewAdapter extends BaseExpandableListAdapter {
             groupViewHolder = (GroupViewHolder) view.getTag();
         }
         groupViewHolder.groupTextView.setText(mGroupStrings[groupPosition]);
-        //根据展开的状态来改变箭头方向
+        // 根据展开状态改变箭头方向
         if (isExpanded) {
             groupViewHolder.pointIv.setImageResource(R.drawable.up);
         } else {
@@ -99,8 +115,7 @@ public class ExpandableListViewAdapter extends BaseExpandableListAdapter {
         return view;
     }
 
-
-    //绘制二级列表
+    // 绘制二级列表项
     @Override
     public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
         View view;
@@ -122,26 +137,28 @@ public class ExpandableListViewAdapter extends BaseExpandableListAdapter {
         childViewHolder.authorTv.setText(mAlbumCollectionList.get(groupPosition).get(childPosition).getSingerName());
         CommonUtil.setImgWithGlide(mContext,
                 mAlbumCollectionList.get(groupPosition).get(childPosition).getAlbumPic(), childViewHolder.faceIv);
-        //点击水波纹效果，结束后开始点击效果
-        childViewHolder.childView.setOnRippleCompleteListener(rippleView -> mChildClickListener.onClick(groupPosition,childPosition));
+        // 点击水波纹效果，结束后开始点击效果
+        childViewHolder.childView.setOnRippleCompleteListener(rippleView -> mChildClickListener.onClick(groupPosition, childPosition));
         return view;
     }
 
+    // 是否可以选择子项
     @Override
     public boolean isChildSelectable(int groupPosition, int childPosition) {
         return true;
     }
 
-
+    // 一级列表项的ViewHolder
     class GroupViewHolder {
         private TextView groupTextView;
         private ImageView pointIv;
     }
 
+    // 二级列表项的ViewHolder
     class ChildViewHolder {
         TextView albumNameTv;
         ImageView faceIv;
         TextView authorTv;
         RippleView childView;
     }
-}
+}