ListView之点击展开菜单

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：

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:background="#EEEEEE"
     android:orientation="vertical"
     tools:context="${relativePackage}.${activityClass}" >

     <ListView
         android:id="@+id/listview_menu_list"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:divider="@null" />

 </LinearLayout>

listview_menu_item.xml：

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:background="@android:color/background_light"
     android:orientation="vertical"
     android:descendantFocusability="blocksDescendants" >

     <TextView
         android:id="@+id/listview_menu_item_txt"
         android:layout_width="match_parent"
         android:layout_height="50dp"
         android:textStyle="bold"
         android:textSize="20sp"
         android:textColor="@android:color/black"
         android:text="123" />

     <LinearLayout
         android:id="@+id/listview_menu_item_menu"
         android:layout_width="match_parent"
         android:layout_height="50dp"
         android:visibility="visible"
         android:orientation="horizontal" >
         <Button
             android:id="@+id/listview_menu_item_menu_toast"
             android:layout_width="0dp"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:background="#8080FF"
             android:textColor="@android:color/black"
             android:textSize="15sp"
             android:text="提示" />
         <Button
             android:id="@+id/listview_menu_item_menu_collapse"
             android:layout_width="0dp"
             android:layout_height="match_parent"
             android:layout_weight="1"
             android:background="#80FF80"
             android:textColor="@android:color/black"
             android:textSize="15sp"
             android:text="收起" />
     </LinearLayout>

 </LinearLayout>

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();
         }
     }

 }

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

四、demo视频

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五、demo工程

保存下面的图片，扩展名改成 .zip 即可

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