android学习笔记13——ExpandableListView

ExpandableListView==>可展开的列表组件

==》

ExpandableListView是ListView的子类，对其进行了扩展，其将应用中的列表项分为几组，每组中又包含多个列表项；

ExpandableListView的用法和ListView非常像，只是其所显示的列表项应该由ExpandableListAdapter提供；

ExpandableListView支持的额外属性：

android:childDivider	指定各组内各子列表项之间的分隔条
android:childIndicator	显示在子列表项旁的Drawable对象
android:groupIndicator	显示在组列表项旁的Drawable对象

实例：

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布局文件==》
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <ExpandableListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#ffffff"
        android:cacheColorHint="#00000000"
        android:listSelector="#00000000" >
    </ExpandableListView>
 
</LinearLayout>
 
实现代码==》
package com.example.myexpandablelistview;
 
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Gravity;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
 
public class MainActivity extends Activity
{
    // 设置组视图的图片
    private int[] logos = new int[]
    { R.drawable.one, R.drawable.two, R.drawable.three };
    // 设置组视图的显示文字
    private String[] generalsTypes = new String[]
    { "One", "Two", "Three" };
    // 子视图显示文字
    private String[][] generals = new String[][]
    {
    { "西瓜", "樱桃", "草莓" },
    { "葡萄", "梨子", "青苹果" },
    { "香蕉", "橙子", "芒果" } };
 
    // 子视图图片
    public int[][] generallogos = new int[][]
    {
    { R.drawable.one, R.drawable.one, R.drawable.one },
    { R.drawable.two, R.drawable.two, R.drawable.two, },
    { R.drawable.three, R.drawable.three, R.drawable.three } };
 
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        final ExpandableListAdapter adapter = new BaseExpandableListAdapter()
        {
            // 自己定义一个获得文字信息的方法
            TextView getTextView()
            {
                @SuppressWarnings("deprecation")
                AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                        ViewGroup.LayoutParams.FILL_PARENT, 64);
                TextView textView = new TextView(MainActivity.this);
                textView.setLayoutParams(lp);
                textView.setGravity(Gravity.CENTER_VERTICAL);
                textView.setPadding(36, 0, 0, 0);
                textView.setTextSize(20);
                textView.setTextColor(Color.BLACK);
                return textView;
            }
 
            // 重写ExpandableListAdapter中的各个方法
            @Override
            public int getGroupCount()
            {
                return generalsTypes.length;
            }
 
            @Override
            public Object getGroup(int groupPosition)
            {
                return generalsTypes[groupPosition];
            }
 
            @Override
            public long getGroupId(int groupPosition)
            {
                return groupPosition;
            }
 
            @Override
            public int getChildrenCount(int groupPosition)
            {
                return generals[groupPosition].length;
            }
 
            @Override
            public Object getChild(int groupPosition, int childPosition)
            {
                return generals[groupPosition][childPosition];
            }
 
            @Override
            public long getChildId(int groupPosition, int childPosition)
            {
                return childPosition;
            }
 
            @Override
            public boolean hasStableIds()
            {
                return true;
            }
 
            @Override
            public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
                    ViewGroup parent)
            {
                LinearLayout ll = new LinearLayout(MainActivity.this);
                ll.setOrientation(0);
                ImageView logo = new ImageView(MainActivity.this);
                logo.setImageResource(logos[groupPosition]);
                logo.setPadding(50, 0, 0, 0);
                ll.addView(logo);
                TextView textView = getTextView();
                textView.setTextColor(Color.BLACK);
                textView.setText(getGroup(groupPosition).toString());
                ll.addView(textView);
 
                return ll;
            }
 
            @Override
            public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
                    View convertView, ViewGroup parent)
            {
                LinearLayout ll = new LinearLayout(MainActivity.this);
                ll.setOrientation(0);
                ImageView generallogo = new ImageView(MainActivity.this);
                generallogo.setImageResource(generallogos[groupPosition][childPosition]);
                ll.addView(generallogo);
                TextView textView = getTextView();
                textView.setText(getChild(groupPosition, childPosition).toString());
                ll.addView(textView);
                return ll;
            }
 
            @Override
            public boolean isChildSelectable(int groupPosition, int childPosition)
            {
                return true;
            }
        };
 
        ExpandableListView expandableListView = (ExpandableListView) findViewById(R.id.list);
        expandableListView.setAdapter(adapter);
 
        // 设置item点击的监听器
        expandableListView.setOnChildClickListener(new OnChildClickListener()
        {
            @Override
            public boolean onChildClick(ExpandableListView parent, View v, int groupPosition,
                    int childPosition, long id)
            {
 
                Toast.makeText(MainActivity.this,
                        "你点击了" + adapter.getChild(groupPosition, childPosition), Toast.LENGTH_SHORT)
                        .show();
 
                return false;
            }
        });
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}