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@ -31,18 +31,29 @@ import java.util.HashSet;
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import java.util.Iterator;
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/**
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* NotesListAdapter是用于展示笔记列表的适配器,继承自CursorAdapter
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* 支持多选模式,可对笔记进行选择操作
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*/
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public class NotesListAdapter extends CursorAdapter {
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private static final String TAG = "NotesListAdapter";
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private Context mContext;
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private HashMap<Integer, Boolean> mSelectedIndex;
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private int mNotesCount;
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private boolean mChoiceMode;
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private Context mContext; // 上下文环境
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private HashMap<Integer, Boolean> mSelectedIndex; // 存储选中项的索引和状态
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private int mNotesCount; // 笔记总数
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private boolean mChoiceMode; // 是否处于选择模式
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/**
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* 应用小部件属性类,用于存储小部件ID和类型
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*/
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public static class AppWidgetAttribute {
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public int widgetId;
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public int widgetType;
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public int widgetId; // 小部件ID
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public int widgetType; // 小部件类型
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};
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/**
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* 构造函数,初始化适配器
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* @param context 上下文环境
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*/
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public NotesListAdapter(Context context) {
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super(context, null);
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mSelectedIndex = new HashMap<Integer, Boolean>();
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@ -50,38 +61,71 @@ public class NotesListAdapter extends CursorAdapter {
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mNotesCount = 0;
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}
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/**
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* 创建新的视图
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* @param context 上下文环境
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* @param cursor 数据集游标
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* @param parent 父视图组
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* @return 返回新的笔记列表项视图
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*/
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@Override
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public View newView(Context context, Cursor cursor, ViewGroup parent) {
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return new NotesListItem(context);
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}
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/**
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* 绑定数据到视图
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* @param view 目标视图
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* @param context 上下文环境
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* @param cursor 数据集游标
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*/
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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 NotesListItem) {
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// 创建笔记项数据对象
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NoteItemData itemData = new NoteItemData(context, cursor);
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// 绑定数据到视图,设置选择模式和选中状态
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((NotesListItem) view).bind(context, itemData, mChoiceMode,
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isSelectedItem(cursor.getPosition()));
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}
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}
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/**
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* 设置指定位置项的选中状态
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* @param position 位置索引
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* @param checked 选中状态
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*/
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public void setCheckedItem(final int position, final boolean checked) {
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mSelectedIndex.put(position, checked);
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notifyDataSetChanged();
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notifyDataSetChanged(); // 通知数据变化,刷新视图
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}
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/**
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* 判断是否处于选择模式
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* @return 是/否
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*/
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public boolean isInChoiceMode() {
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return mChoiceMode;
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}
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/**
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* 设置选择模式
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* @param mode 选择模式
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*/
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public void setChoiceMode(boolean mode) {
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mSelectedIndex.clear();
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mChoiceMode = mode;
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mSelectedIndex.clear(); // 清除已选项目
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mChoiceMode = mode; // 设置选择模式
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}
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/**
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* 全选或取消全选操作
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* @param checked 全选/取消全选
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*/
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public void selectAll(boolean checked) {
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Cursor cursor = getCursor();
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for (int i = 0; i < getCount(); i++) {
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if (cursor.moveToPosition(i)) {
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// 只对笔记类型进行操作,文件夹不处理
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if (NoteItemData.getNoteType(cursor) == Notes.TYPE_NOTE) {
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setCheckedItem(i, checked);
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}
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@ -89,6 +133,10 @@ public class NotesListAdapter extends CursorAdapter {
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}
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}
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/**
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* 获取选中项的ID集合
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* @return 选中项ID的集合
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*/
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public HashSet<Long> getSelectedItemIds() {
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HashSet<Long> itemSet = new HashSet<Long>();
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for (Integer position : mSelectedIndex.keySet()) {
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@ -101,10 +149,13 @@ public class NotesListAdapter extends CursorAdapter {
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}
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}
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}
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return itemSet;
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}
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/**
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* 获取选中的小部件集合
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* @return 选中的小部件属性集合
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*/
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public HashSet<AppWidgetAttribute> getSelectedWidget() {
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HashSet<AppWidgetAttribute> itemSet = new HashSet<AppWidgetAttribute>();
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for (Integer position : mSelectedIndex.keySet()) {
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@ -128,6 +179,10 @@ public class NotesListAdapter extends CursorAdapter {
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return itemSet;
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}
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/**
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* 获取选中项的数量
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* @return 选中项数量
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*/
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public int getSelectedCount() {
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Collection<Boolean> values = mSelectedIndex.values();
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if (null == values) {
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@ -143,11 +198,20 @@ public class NotesListAdapter extends CursorAdapter {
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return count;
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}
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/**
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* 判断是否已全选
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* @return 是/否
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*/
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public boolean isAllSelected() {
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int checkedCount = getSelectedCount();
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return (checkedCount != 0 && checkedCount == mNotesCount);
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}
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/**
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* 判断指定位置的项是否被选中
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* @param position 位置索引
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* @return 是/否
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*/
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public boolean isSelectedItem(final int position) {
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if (null == mSelectedIndex.get(position)) {
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return false;
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@ -155,18 +219,28 @@ public class NotesListAdapter extends CursorAdapter {
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return mSelectedIndex.get(position);
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}
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/**
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* 当内容发生变化时调用
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*/
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@Override
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protected void onContentChanged() {
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super.onContentChanged();
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calcNotesCount();
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calcNotesCount(); // 重新计算笔记数量
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}
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/**
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* 更改游标时调用
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* @param cursor 新的游标
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*/
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@Override
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public void changeCursor(Cursor cursor) {
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super.changeCursor(cursor);
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calcNotesCount();
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calcNotesCount(); // 重新计算笔记数量
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}
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/**
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* 计算笔记数量,只统计类型为笔记的项
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*/
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private void calcNotesCount() {
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mNotesCount = 0;
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for (int i = 0; i < getCount(); i++) {
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@ -181,4 +255,4 @@ public class NotesListAdapter extends CursorAdapter {
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}
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}
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}
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}
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}
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