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package net.micode.notes.ui;
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import android.content.Context;
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import android.view.Menu;
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import android.view.MenuItem;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.widget.Button;
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import android.widget.PopupMenu;
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import android.widget.PopupMenu.OnMenuItemClickListener;
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import net.micode.notes.R;
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// 下拉菜单类，用于创建和管理与按钮关联的下拉菜单
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public class DropdownMenu {
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// 关联的按钮
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private Button mButton;
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// 弹出式菜单对象
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private PopupMenu mPopupMenu;
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// 菜单对象
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private Menu mMenu;
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// 构造函数，初始化下拉菜单相关组件
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public DropdownMenu(Context context, Button button, int menuId) {
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mButton = button;
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// 设置按钮的背景为下拉图标
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mButton.setBackgroundResource(R.drawable.dropdown_icon);
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// 创建与按钮关联的弹出式菜单
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mPopupMenu = new PopupMenu(context, mButton);
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mMenu = mPopupMenu.getMenu();
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// 填充菜单资源
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mPopupMenu.getMenuInflater().inflate(menuId, mMenu);
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// 设置按钮的点击事件，点击时显示弹出式菜单
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mButton.setOnClickListener(new OnClickListener() {
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public void onClick(View v) {
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mPopupMenu.show();
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}
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});
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}
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// 设置下拉菜单菜单项的点击监听器
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public void setOnDropdownMenuItemClickListener(OnMenuItemClickListener listener) {
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if (mPopupMenu!= null) {
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mPopupMenu.setOnMenuItemClickListener(listener);
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}
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}
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// 根据ID查找菜单项
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public MenuItem findItem(int id) {
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return mMenu.findItem(id);
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}
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// 设置按钮的文本（即下拉菜单的标题）
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public void setTitle(CharSequence title) {
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mButton.setText(title);
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}
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}
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package net.micode.notes.ui;
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import android.content.Context;
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import android.database.Cursor;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.CursorAdapter;
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import android.widget.LinearLayout;
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import android.widget.TextView;
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import net.micode.notes.R;
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import net.micode.notes.data.Notes;
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import net.micode.notes.data.Notes.NoteColumns;
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// 文件夹列表适配器类，用于将文件夹数据适配到列表视图中
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public class FoldersListAdapter extends CursorAdapter {
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// 查询文件夹数据的投影，包括ID和片段（名称）
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public static final String[] PROJECTION = {
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NoteColumns.ID,
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NoteColumns.SNIPPET
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};
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// 投影中ID列的索引
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public static final int ID_COLUMN = 0;
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// 投影中名称列的索引
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public static final int NAME_COLUMN = 1;
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// 构造函数，初始化父类
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public FoldersListAdapter(Context context, Cursor c) {
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super(context, c);
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// TODO Auto-generated constructor stub
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}
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// 创建新的视图项，返回一个FolderListItem实例
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@Override
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public View newView(Context context, Cursor cursor, ViewGroup parent) {
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return new FolderListItem(context);
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}
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// 绑定视图数据，根据文件夹ID设置显示的名称
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@Override
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public void bindView(View view, Context context, Cursor cursor) {
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if (view instanceof FolderListItem) {
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String folderName = (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER)? context
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.getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
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((FolderListItem) view).bind(folderName);
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}
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}
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// 根据位置获取文件夹名称
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public String getFolderName(Context context, int position) {
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Cursor cursor = (Cursor) getItem(position);
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return (cursor.getLong(ID_COLUMN) == Notes.ID_ROOT_FOLDER)? context
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.getString(R.string.menu_move_parent_folder) : cursor.getString(NAME_COLUMN);
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}
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// 文件夹列表项内部类，继承自LinearLayout，用于显示文件夹名称
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private class FolderListItem extends LinearLayout {
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private TextView mName;
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// 构造函数，初始化视图并获取名称文本视图
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public FolderListItem(Context context) {
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super(context);
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inflate(context, R.layout.folder_list_item, this);
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mName = (TextView) findViewById(R.id.tv_folder_name);
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}
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// 绑定名称数据到文本视图
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public void bind(String name) {
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mName.setText(name);
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}
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}
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} |
