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  • [ 转]Android折叠列表 ExpandableList

    本文转自：http://lovezhou.iteye.com/blog/848744

    ExpandableList 是折叠列表，通过继承ExpandableListActivity 类就可以非常简单的实现折叠列表。
    效果图：


    代码实现
    Java代码 复制代码 收藏代码
    1. package com.zhou.activity;   
    2.   
    3. import android.app.ExpandableListActivity;   
    4. import android.os.Bundle;   
    5. import android.view.ContextMenu;   
    6. import android.view.Gravity;   
    7. import android.view.MenuItem;   
    8. import android.view.View;   
    9. import android.view.ViewGroup;   
    10. import android.view.ContextMenu.ContextMenuInfo;   
    11. import android.widget.AbsListView;   
    12. import android.widget.BaseExpandableListAdapter;   
    13. import android.widget.ExpandableListAdapter;   
    14. import android.widget.ExpandableListView;   
    15. import android.widget.TextView;   
    16. import android.widget.Toast;   
    17. import android.widget.ExpandableListView.ExpandableListContextMenuInfo;   
    18.   
    19. public class ExpandableList extends ExpandableListActivity {   
    20.     //声明adapter   
    21.     private ExpandableListAdapter mAdapter;   
    22.     @Override  
    23.     protected void onCreate(Bundle savedInstanceState) {   
    24.         super.onCreate(savedInstanceState);   
    25.         //设这标题   
    26.         setTitle("可扩展的列表");   
    27.         //实例化adapter   
    28.         mAdapter = new MyExpandableListAdapter();   
    29.         //为列表设置adapter   
    30.         setListAdapter(mAdapter);   
    31.         //为list注册context菜单   
    32.         registerForContextMenu(this.getExpandableListView());   
    33.     }   
    34.        
    35.        
    36.     @Override  
    37.     public boolean onChildClick(ExpandableListView parent, View v,   
    38.             int groupPosition, int childPosition, long id) {   
    39.         Toast.makeText(this, " 组元素索引: " + groupPosition + " 子元素索引: " + childPosition, Toast.LENGTH_SHORT).show();   
    40.         return super.onChildClick(parent, v, groupPosition, childPosition, id);   
    41.     }   
    42.   
    43.   
    44.     @Override  
    45.     public void onGroupExpand(int groupPosition) {   
    46.         Toast.makeText(this, " 组元素索引: " + groupPosition, Toast.LENGTH_SHORT).show();   
    47.         super.onGroupExpand(groupPosition);   
    48.     }   
    49.   
    50.     @Override  
    51.     public void onCreateContextMenu(ContextMenu menu, View v,   
    52.             ContextMenuInfo menuInfo) {   
    53.         menu.setHeaderTitle("上下文菜单");   
    54.         menu.add(0, 0, 0, "单击我");   
    55.     }   
    56.   
    57.     // 单击上下文菜单后的逻辑   
    58.     @Override  
    59.     public boolean onContextItemSelected(MenuItem item) {   
    60.         ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();   
    61.         String title = ((TextView) info.targetView).getText().toString();   
    62.   
    63.         int type = ExpandableListView.getPackedPositionType(info.packedPosition);   
    64.         if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {   
    65.             int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);   
    66.             int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);   
    67.             Toast.makeText(this, title + " 组元素索引: " + groupPos + " 子元素索引: " + childPos, Toast.LENGTH_SHORT).show();   
    68.             return true;   
    69.         } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {   
    70.             int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);   
    71.             Toast.makeText(this, title + " 组元素索引: " + groupPos, Toast.LENGTH_SHORT).show();   
    72.             return true;   
    73.         }   
    74.         return false;   
    75.     }   
    76.     //自定义Adapter   
    77.     public class MyExpandableListAdapter extends BaseExpandableListAdapter {   
    78.         // 父列表数据   
    79.         private String[] groups =    
    80.         {    
    81.             "吉林省",    
    82.             "辽宁省",    
    83.             "黑龙江省",   
    84.             "山东省"    
    85.         };   
    86.         // 子列表数据   
    87.         private String[][] children =    
    88.         {   
    89.             { "长春市" },   
    90.             { "沈阳市", "铁岭市" },   
    91.             { "哈尔滨市", "齐齐哈尔市", "牡丹江市" },   
    92.             { "济南市", "青岛市", "淄博市", "潍坊市" }   
    93.         };   
    94.         @Override  
    95.         public Object getChild(int groupPosition, int childPosition) {   
    96.             return children[groupPosition][childPosition];   
    97.         }   
    98.         @Override  
    99.         public long getChildId(int groupPosition, int childPosition) {   
    100.             return childPosition;   
    101.         }   
    102.         @Override  
    103.         public int getChildrenCount(int groupPosition) {   
    104.             return children[groupPosition].length;   
    105.         }   
    106.         // 取子列表中的某一项的 View   
    107.         @Override  
    108.         public View getChildView(int groupPosition, int childPosition,   
    109.                 boolean isLastChild, View convertView, ViewGroup parent) {   
    110.             TextView textView = getGenericView();   
    111.             textView.setText(getChild(groupPosition, childPosition).toString());   
    112.             return textView;   
    113.         }   
    114.         @Override  
    115.         public Object getGroup(int groupPosition) {   
    116.             return groups[groupPosition];   
    117.         }   
    118.         @Override  
    119.         public int getGroupCount() {   
    120.             return groups.length;   
    121.         }   
    122.         @Override  
    123.         public long getGroupId(int groupPosition) {   
    124.             return groupPosition;   
    125.         }   
    126.         // 取父列表中的某一项的 View   
    127.         @Override  
    128.         public View getGroupView(int groupPosition, boolean isExpanded,   
    129.                 View convertView, ViewGroup parent) {   
    130.             TextView textView = getGenericView();   
    131.             textView.setText(getGroup(groupPosition).toString());   
    132.             return textView;   
    133.         }   
    134.         @Override  
    135.         public boolean hasStableIds() {   
    136.             return true;   
    137.         }   
    138.         @Override  
    139.         public boolean isChildSelectable(int groupPosition, int childPosition) {   
    140.             return true;   
    141.         }   
    142.         // 获取某一项的 View 的逻辑   
    143.         private TextView getGenericView() {   
    144.             AbsListView.LayoutParams lp = new AbsListView.LayoutParams(   
    145.                     ViewGroup.LayoutParams.FILL_PARENT, 48);   
    146.             TextView textView = new TextView(ExpandableList.this);   
    147.             textView.setLayoutParams(lp);   
    148.             textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);   
    149.             textView.setPadding(32, 0, 0, 0);   
    150.             return textView;   
    151.         }   
    152.     }   
    153. }  
    package com.zhou.activity;

import android.app.ExpandableListActivity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ExpandableListView.ExpandableListContextMenuInfo;

public class ExpandableList extends ExpandableListActivity {
	//声明adapter
	private ExpandableListAdapter mAdapter;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		//设这标题
		setTitle("可扩展的列表");
		//实例化adapter
		mAdapter = new MyExpandableListAdapter();
		//为列表设置adapter
		setListAdapter(mAdapter);
		//为list注册context菜单
		registerForContextMenu(this.getExpandableListView());
	}
	
	
	@Override
	public boolean onChildClick(ExpandableListView parent, View v,
			int groupPosition, int childPosition, long id) {
		Toast.makeText(this, " 组元素索引: " + groupPosition + " 子元素索引: " + childPosition, Toast.LENGTH_SHORT).show();
		return super.onChildClick(parent, v, groupPosition, childPosition, id);
	}


	@Override
	public void onGroupExpand(int groupPosition) {
		Toast.makeText(this, " 组元素索引: " + groupPosition, Toast.LENGTH_SHORT).show();
		super.onGroupExpand(groupPosition);
	}

	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) {
		menu.setHeaderTitle("上下文菜单");
		menu.add(0, 0, 0, "单击我");
	}

	// 单击上下文菜单后的逻辑
	@Override
	public boolean onContextItemSelected(MenuItem item) {
		ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();
		String title = ((TextView) info.targetView).getText().toString();

		int type = ExpandableListView.getPackedPositionType(info.packedPosition);
		if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {
			int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
			int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);
			Toast.makeText(this, title + " 组元素索引: " + groupPos + " 子元素索引: " + childPos, Toast.LENGTH_SHORT).show();
			return true;
		} else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {
			int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);
			Toast.makeText(this, title + " 组元素索引: " + groupPos, Toast.LENGTH_SHORT).show();
			return true;
		}
		return false;
	}
	//自定义Adapter
	public class MyExpandableListAdapter extends BaseExpandableListAdapter {
		// 父列表数据
		private String[] groups = 
		{ 
			"吉林省", 
			"辽宁省", 
			"黑龙江省",
			"山东省" 
		};
		// 子列表数据
		private String[][] children = 
		{
			{ "长春市" },
			{ "沈阳市", "铁岭市" },
			{ "哈尔滨市", "齐齐哈尔市", "牡丹江市" },
			{ "济南市", "青岛市", "淄博市", "潍坊市" }
		};
		@Override
		public Object getChild(int groupPosition, int childPosition) {
			return children[groupPosition][childPosition];
		}
		@Override
		public long getChildId(int groupPosition, int childPosition) {
			return childPosition;
		}
		@Override
		public int getChildrenCount(int groupPosition) {
			return children[groupPosition].length;
		}
		// 取子列表中的某一项的 View
		@Override
		public View getChildView(int groupPosition, int childPosition,
				boolean isLastChild, View convertView, ViewGroup parent) {
			TextView textView = getGenericView();
			textView.setText(getChild(groupPosition, childPosition).toString());
			return textView;
		}
		@Override
		public Object getGroup(int groupPosition) {
			return groups[groupPosition];
		}
		@Override
		public int getGroupCount() {
			return groups.length;
		}
		@Override
		public long getGroupId(int groupPosition) {
			return groupPosition;
		}
		// 取父列表中的某一项的 View
		@Override
		public View getGroupView(int groupPosition, boolean isExpanded,
				View convertView, ViewGroup parent) {
			TextView textView = getGenericView();
			textView.setText(getGroup(groupPosition).toString());
			return textView;
		}
		@Override
		public boolean hasStableIds() {
			return true;
		}
		@Override
		public boolean isChildSelectable(int groupPosition, int childPosition) {
			return true;
		}
		// 获取某一项的 View 的逻辑
		private TextView getGenericView() {
			AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
					ViewGroup.LayoutParams.FILL_PARENT, 48);
			TextView textView = new TextView(ExpandableList.this);
			textView.setLayoutParams(lp);
			textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
			textView.setPadding(32, 0, 0, 0);
			return textView;
		}
	}
}
    • 大小: 17.2 KB
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  • 原文地址：https://www.cnblogs.com/freeliver54/p/3003510.html
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