基于Android的计步器(Pedometer)的讲解—ExpandableListView – Android移动开发技术文章_手机开发 – 红黑联盟

今天移动开发课程验收完成，可以小小的松一口气了，感觉在同学中，自己做的这个计步器还是挺不错的嘛~~

然后对原来的手机计步器（pedometer）项目又做了一些完善：

注：这应该是本系列第三篇？

先给出ExpandableListView的一些效果图

\\

先给出ExpandableListViewAdapter的代码：

 

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package com.bit.expandablelistview;
import java.util.HashMap;
import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.TextView;
public class ExpandableListViewAdapter extends BaseExpandableListAdapter {
    private List<string> group;//这是组视图
    private HashMap<string, user="">> child;//这是子视图
    private ExpandableListView listView;//当选择另一个组视图时关闭当前打开的组视图
    private LayoutInflater inflater;//加载布局文件
    private int last;//判断是否打开当前的页面
    public ExpandableListViewAdapter(Context context, List<string> group,
            HashMap<string, user="">> child, ExpandableListView listView) {
        this.group = group;
        this.child = child;
        this.listView = listView;
        this.inflater = LayoutInflater.from(context);
    }
    /**
     * 对外提供一个借口，当数据改变时调用这个函数
     * @param group
     * @param child
     */
    public void setOnDataChanged(List<string> group,
            HashMap<string, user="">> child) {
        this.group = group;
        this.child = child;
        this.notifyDataSetChanged();
    }
    @Override
    public int getGroupCount() {
        // TODO Auto-generated method stub
        return group.size();
    }
    @Override
    public int getChildrenCount(int groupPosition) {
        List<user> tempList = child.get(group.get(groupPosition));
        if (tempList != null) {
            return tempList.size();
        } else {
            return 0;
        }
    }
    @Override
    public Object getGroup(int groupPosition) {
        // TODO Auto-generated method stub
        return group.get(groupPosition);
    }
    @Override
    public Object getChild(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return child.get(group.get(groupPosition)).get(childPosition);
    }
    @Override
    public long getGroupId(int groupPosition) {
        // TODO Auto-generated method stub
        return groupPosition;
    }
    @Override
    public long getChildId(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return childPosition;
    }
    @Override
    public boolean hasStableIds() {
        // TODO Auto-generated method stub
        return false;
    }
    /**
     * 得到组视图布局文件，对这个进行了优化，可以看到converView是一个Android提供的缓存的对象，如果第一次没有这个布局文件
     * 就创建一个，如果有的话，直接从convertView得到，不用进行创建，减少内存开销
     */
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {
        String groupName = group.get(groupPosition);
        View view;
        TextView name;
        if (convertView == null) {
            view = inflater.inflate(R.layout.group_item, null);
            name = (TextView) view.findViewById(R.id.group_number);
            view.setTag(name);
        } else {
            view = convertView;
            name = (TextView) view.getTag();
        }
        name.setText(groupName);
        return view;
    }
    private class ViewHolder {
        ImageView picture;
        TextView name;
    }
    /**
     * 得到子视图的布局文件，类似于组视图
     */
    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
        User user = child.get(group.get(groupPosition)).get(childPosition);
        View view;
        ViewHolder viewHolder;
        if (convertView == null) {
            view = inflater.inflate(R.layout.child_item, null);
            viewHolder = new ViewHolder();
            viewHolder.picture = (ImageView) view.findViewById(R.id.pic);
            viewHolder.name = (TextView) view.findViewById(R.id.child_name);
            view.setTag(viewHolder);
        } else {
            view = convertView;
            viewHolder = (ViewHolder) view.getTag();
        }
        viewHolder.name.setText(user.getName());
        viewHolder.picture.setImageResource(user.getPicture());
        return view;
    }
    /**
     * 设置可以点击子视图
     */
    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        return true;
    }
    @Override
    public void onGroupExpanded(int groupPosition) {
        super.onGroupExpanded(groupPosition);
        if (groupPosition != last) {
            listView.collapseGroup(last);
        }
        last = groupPosition;
    }
}
</user></string,></string></string,></string></string,></string>

 

然后给出MainActivity类的代码

 

 

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package com.bit.expandablelistview;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.Toast;
public class MainActivity extends Activity implements OnChildClickListener {
    private List<string> group;//这是组视图
    private HashMap<string, user="">> child;//这是子视图
    private ExpandableListView listView;//这是可以扩展的listview
    private ExpandableListViewAdapter adapter;
    //这是子视图要加载的所有图片
    private int pic[] = new int[] { R.drawable.head1, R.drawable.head2,
            R.drawable.head3, R.drawable.head4, R.drawable.head5,
            R.drawable.head6, R.drawable.head7, R.drawable.head8,
            R.drawable.head9, R.drawable.head10 };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        prepareData();
        showData();
    }
    /**
     * 显示数据
     */
    private void showData() {
        if (adapter == null) {
            adapter = new ExpandableListViewAdapter(this, group, child,
                    listView);
            listView.setAdapter(adapter);
        } else {
            adapter.setOnDataChanged(group, child);
        }
    }
    /**
     * 初始化一些参数，设置监听事件
     */
    private void init() {
        group = new ArrayList<string>();
        child = new HashMap<string, user="">>();
        listView = (ExpandableListView) findViewById(R.id.expandlistview);
        listView.setOnChildClickListener(this);
    }
    /**
     * 准备测试数据
     */
    private void prepareData() {
        group.add(第一组);
        group.add(第二组);
        group.add(第三组);
        List<user> users = new ArrayList<user>();
        for (int i = 0; i < 4; i++) {
            User user = new User();
            user.setName(张全蛋 + i);
            user.setPicture(pic[i]);
            users.add(user);
        }
        child.put(group.get(0), users);
        users = new ArrayList<user>();
        for (int i = 4; i < 7; i++) {
            User user = new User();
            user.setName(李铁柱 + i);
            user.setPicture(pic[i]);
            users.add(user);
        }
        child.put(group.get(1), users);
        users = new ArrayList<user>();
        for (int i = 7; i < 10; i++) {
            User user = new User();
            user.setName(唐马儒 + i);
            user.setPicture(pic[i]);
            users.add(user);
        }
        child.put(group.get(2), users);
    
    }
    @Override
    public boolean onChildClick(ExpandableListView parent, View v,
            int groupPosition, int childPosition, long id) {
        //点击显示当前子视图的位置
        Toast.makeText(
                MainActivity.this,
                你点击的是
                        + child.get(group.get(groupPosition))
                                .get(childPosition).getName(),
                Toast.LENGTH_SHORT).show();
        return false;
    }
}
</user></user></user></user></string,></string></string,></string>

 

大家注意，其中的User类是自己定义的一个类。

相关文章：

基于Android的计步器(Pedometer)的讲解(一)——Fragment页面跳转 – Android移动开发技术文章_手机开发 – 红黑联盟

基于Android的计步器(Pedometer)的讲解(二)——柱状图分析 – Android移动开发技术文章_手机开发 – 红黑联盟

http://www.codeclip.com/3566.html

基于Android的计步器(Pedometer)的讲解(四)——后台记步 – Android移动开发技术文章_手机开发 – 红黑联盟

基于Android的计步器(Pedometer)的讲解(五)——跟随界面滑动的指示器 – Android移动开发技术文章_手机开发 – 红黑联盟

来源URL：http://www.2cto.com/kf/201501/370216.html