ADD file via upload

src_7F周希奥代码注释/FoldersListAdapter.java

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+package net.micode.notes.ui;
+ 
+import android.content.Context;
+import android.database.Cursor;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.CursorAdapter;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+ 
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.NoteColumns;
+ 
+ 
+public class FoldersListAdapter extends CursorAdapter {
+	//CursorAdapter是Cursor和ListView的接口
+	//FoldersListAdapter继承了CursorAdapter的类
+	//主要作用是便签数据库和用户的交互
+	//这里就是用folder（文件夹）的形式展现给用户
+    public static final String [] PROJECTION = {
+        NoteColumns.ID,
+        NoteColumns.SNIPPET
+    };//调用数据库中便签的ID和片段
+ 
+    public static final int ID_COLUMN   = 0;
+    public static final int NAME_COLUMN = 1;
+ 
+    public FoldersListAdapter(Context context, Cursor c) {
+        super(context, c);
+        // TODO Auto-generated constructor stub
+    }//数据库操作
+ 
+    @Override
+    public View newView(Context context, Cursor cursor, ViewGroup parent) {
+        //ViewGroup是容器
+    	return new FolderListItem(context);
+    }//创建一个文件夹，对于各文件夹中子标签的初始化
+ 
+    @Override
+    public void bindView(View view, Context context, Cursor cursor) {
+        if (view instanceof FolderListItem) {
+            String folderName = (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
+                    .getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+            ((FolderListItem) view).bind(folderName);
+        }
+    }//将各个布局文件绑定起来
+ 
+    public String getFolderName(Context context, int position) {
+        Cursor cursor = (Cursor) getItem(position);
+        return (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER) ? context
+                .getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
+    }//根据数据库中标签的ID得到标签的各项内容
+ 
+    private class FolderListItem extends LinearLayout {
+        private TextView mName;
+ 
+        public FolderListItem(Context context) {
+            super(context);
+            //操作数据库
+            inflate(context, R.layout.folder_list_item, this);
+            //根据布局文件的名字等信息将其找出来
+            mName = (TextView) findViewById(R.id.tv_folder_name);
+        }
+ 
+        public void bind(String name) {
+            mName.setText(name);
+        }
+    }
+ 
+}