Android组件ExpandableListView及其适配器,线程中的runOnUiThread()的使用

工作内容：

1.ExpandableListView 的学习，及其适配器继承自BaseExpandableListAdapter的自定义适配器

2.学了runOnUiThread()的简单使用(可以直接操作ui界面，短时间的)

3.获取系统的信息

学习分享：

一、ExpandableListView是继承自ListView的一个组件，主要体现方式是2层ListView，外层是group,内层是child.

二、BaseExpandableListAdapter它的子类适配器，主要为ExpandableListView服务，主要要搞清楚内层和外层的数据如何去取，如何使用。

三、onUiThread存在于Ui线程中的一条线程，作用类似于Handler,做系统的Ui界面的修改

四、获取系统信息时，需在manifest中注册权限

常用的信息有Build打点就可以使用

实例：

//ExpandableListView 的适配器

import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseExpandableListAdapter;import android.widget.ImageView;import android.widget.TextView;import java.util.List;import java.util.Map;import azsecuer.androidy.com.mobelmanager.R;import azsecuer.androidy.com.mobelmanager.activity.dataclass.MobelCheckingListChild;import azsecuer.androidy.com.mobelmanager.activity.dataclass.MobelCheckingListGroup;public class HomeMobelCheckingExpandAdapter extends BaseExpandableListAdapter {    private List<MobelCheckingListGroup> grouplist = null;//外层数据    private Map<String,List<MobelCheckingListChild>> childmap=null;//内层数据    private int resourceID;    private Context context;    private int resourceIDChild;    private List<Integer> backgroundColorList;    /**     * 构造函数     * @param context     * @param resourceID group布局文件id     * @param resourceIDChild 子布局文件id     * @param grouplist group数据     * @param childmap 子项数据     * @param backgroundColorList group背景色数据—每一条都不同颜色     */    public HomeMobelCheckingExpandAdapter(Context context, int resourceID, int resourceIDChild,                                          List<MobelCheckingListGroup> grouplist,                                          Map<String, List<MobelCheckingListChild>> childmap,                                          List<Integer> backgroundColorList) {        this.grouplist = grouplist;        this.childmap = childmap;        this.resourceID = resourceID;        this.context = context;        this.resourceIDChild = resourceIDChild;        this.backgroundColorList = backgroundColorList;    }    @Override    public int getGroupCount() {        return grouplist.size();    }    @Override    public int getChildrenCount(int groupPosition) {        return childmap.get(grouplist.get(groupPosition).getTitle()).size();    }    @Override    public MobelCheckingListGroup getGroup(int groupPosition) {        return grouplist.get(groupPosition);    }    @Override    public MobelCheckingListChild getChild(int groupPosition, int childPosition) {        return childmap.get(grouplist.get(groupPosition).getTitle()).get(childPosition);    }    @Override    public long getGroupId(int groupPosition) {        return groupPosition;    }    @Override    public long getChildId(int groupPosition, int childPosition) {        return childPosition;    }    @Override    public boolean hasStableIds() {        //设置为true表示数据源刷新        return true;    }    //获取group布局,并填充内容    @Override    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {        MobelCheckingListGroup mobelCheckingListGroup= getGroup(groupPosition);        if(convertView == null){            convertView = LayoutInflater.from(context).inflate(resourceID,null);        }        convertView.setBackgroundColor(backgroundColorList.get(groupPosition));//        convertView.setBackgroundColor(context.getResources().getColor(backgroundColor));        ImageView imageView = (ImageView)convertView.findViewById(R.id.iv_list_expand_parent);        imageView.setBackgroundResource(mobelCheckingListGroup.getImageViewID());        TextView textView = (TextView)convertView.findViewById(R.id.textView_list_expand);        textView.setText(getGroup(groupPosition).getTitle());        return convertView;    }    //获取子布局，并填充内容    @Override    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {        if(convertView == null){            convertView = LayoutInflater.from(context).inflate(resourceIDChild,null);        }        TextView textView = (TextView)convertView.findViewById(R.id.textView_list_expand_child);        TextView textView1 = (TextView)convertView.findViewById(R.id.textView1_list_expand_child);        textView.setText(getChild(groupPosition,childPosition).getContent());        textView1.setText(getChild(groupPosition,childPosition).getTitle());        return convertView;    }    @Override    public boolean isChildSelectable(int groupPosition, int childPosition) {        //最后一项是否可选        return false;    }}

实例 2 ：runOnUiThread(){}的应用

 /**     * 1.给list添加数据     * 2.在runOnUiThread(new Runnable(){run(){...}}中更新主线程的adapter     * @throws IOException     */    public void createDatabase() throws IOException{        fileList = new ArrayList<>();        tagFile = new File("/data/data/"+this.getPackageName()+"/databases/clearpath.db");        if (!tagFile.exists()){            tagFile.getParentFile().mkdirs();            tagFile.createNewFile();        }        if(tagFile.length() == 0){            FileManager.copyFile(this,"clearpath.db",tagFile);        }        new Thread(){            @Override            public void run() {                /**                 * tagFile  传入数据库文件的File对象                 * fileList 装有可能需要删除的File对象                 * 注意：如果您的list已经初始化，并已经设置进了adapter                 * 这步使list变成了另外一个list,直接使用会导致listView加载不了数据                 */                list = MySQLiteTool.select(ClearMobelActivity.this,tagFile,fileList);                //提醒handler去list更新完成需更新适配器//                handler.sendEmptyMessage(0);                runOnUiThread(new Runnable() {                    @Override                    public void run() {                        adapter = new ClearMobelAdapter(ClearMobelActivity.this,R.layout.list_clear_mobel,list);                        listView.setAdapter(adapter);                        adapter.notifyDataSetChanged();                        listView.setVisibility(View.VISIBLE);                        progressbar.setVisibility(View.INVISIBLE);                    }                });            }        }.start();    }