ListView之点击展开菜单

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一、概述

ListView点击item显示菜单是要实现这样的效果：

需要实现的逻辑如下：

1）点击一个普通item，展开当前菜单，同时关闭其他菜单

2）点击一个已展开的菜单，隐藏当前菜单

3）将展开菜单滑到listview之外，再滑动回来，展开菜单状态不变

4）点击菜单中的按钮，能够根据不同item进行不同的处理

二、实现思路

1、UI布局上，对于这种每个listitem都包含动态显示菜单的场景，可以直接在listitem的xml布局里就包含两部分元素：item本身以及展开菜单

点击item的时候，动态控制展开菜单这部分元素的Visibility就可以了

2、逻辑控制上，需要额外记录当前展开菜单的item是谁，这样可以方便高效的实现概述中描述的逻辑

[转载请保留本文地址：http://www.cnblogs.com/snser/p/5539746.html]

三、开始干活

实现的代码结构不复杂，这里直接贴代码了：

listview_menu.xml：

listview_menu_item.xml：

ListViewMenuActivity.java：

public class ListViewMenuActivity extends Activity {
private int mExpandedMenuPos = -1;
private ListViewAdapter mAdapter; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview_menu); ArrayList<Integer> data = new ArrayList<Integer>();
for (int index = 0; index != 40; ++index) {
data.add(index);
} ListView list = (ListView)findViewById(R.id.listview_menu_list);
list.setAdapter(mAdapter = new ListViewAdapter(this, data));
list.setOnItemClickListener(new OnListItemClickListenser());
} private class ListViewAdapter extends BaseAdapter {
private LayoutInflater mLayoutInflater;
private ArrayList<Integer> mListData; private OnMenuClickListenser mOnMenuClickListenser = new OnMenuClickListenser(); private class ViewHolder {
public ViewHolder (View viewRoot) {
root = viewRoot;
txt = (TextView)viewRoot.findViewById(R.id.listview_menu_item_txt);
menu = viewRoot.findViewById(R.id.listview_menu_item_menu);
btnToast = (Button)viewRoot.findViewById(R.id.listview_menu_item_menu_toast);
btnCollapse = (Button)viewRoot.findViewById(R.id.listview_menu_item_menu_collapse);
}
public View root;
public TextView txt;
public View menu;
public Button btnToast;
public Button btnCollapse;
} public ListViewAdapter(Context context, ArrayList<Integer> data) {
mLayoutInflater = LayoutInflater.from(context);
mListData = data;
} @Override
public int getCount() {
return mListData == null ? 0 : mListData.size();
} @Override
public Object getItem(int position) {
return mListData == null ? 0 : mListData.get(position);
} @Override
public long getItemId(int position) {
return position;
} @Override
public View getView(final int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = mLayoutInflater.inflate(R.layout.listview_menu_item, parent, false);
convertView.setTag(new ViewHolder(convertView));
}
if (convertView != null && convertView.getTag() instanceof ViewHolder) {
final ViewHolder holder = (ViewHolder)convertView.getTag();
holder.txt.setText(String.valueOf(getItem(position)));
if (position % 2 == 0) {
holder.root.setBackgroundColor(0xFFC9EEFE);
} else {
holder.root.setBackgroundColor(0xFFFFFFFF);
}
holder.menu.setVisibility(position == mExpandedMenuPos ? View.VISIBLE : View.GONE);
holder.btnToast.setText("提示" + position);
holder.btnCollapse.setText("收起" + position);
holder.btnToast.setOnClickListener(mOnMenuClickListenser);
holder.btnCollapse.setOnClickListener(mOnMenuClickListenser);
}
return convertView;
} private class OnMenuClickListenser implements View.OnClickListener {
@Override
public void onClick(View v) {
final int id = v.getId();
if (id == R.id.listview_menu_item_menu_toast) {
Toast.makeText(ListViewMenuActivity.this, "提示" + mExpandedMenuPos, Toast.LENGTH_SHORT).show();
} else if (id == R.id.listview_menu_item_menu_collapse) {
mExpandedMenuPos = -1;
notifyDataSetChanged();
}
}
}
} private class OnListItemClickListenser implements OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (position == mExpandedMenuPos) {
mExpandedMenuPos = -1;
} else {
mExpandedMenuPos = position;
}
mAdapter.notifyDataSetChanged();
}
} }