Android开发，用ExpandableListView+Dialog 仿Spinner

讨论学习，共同进步。
纯粹闲了没事，学习了1个月的Android开发，所以稚嫩之处敬请谅解。
用ExpandableListView+Dialog 仿Spinner，还有待完善。

在iteye上下了很多资料，今天第一帖回报这个论坛。



主要功能：
1. 异步填充list数据，TitleBar显示正在运行的进度条（犹豫数据少，很难发现运行）
2. 类似Spinner控件的弹出式ExpandableListView选择窗口，实现记忆选择项
   注意点是弹出窗要常驻内存，再次绑定数据后要重新定位上次选择项
    
未解决问题：
1. 由于EL Adapter的特性，当点击Group项后，上次选择的Child项无法去除背景，会和新选择的项同事存在，再次点击Group后才能去除；

Android开发，用ExpandableListView+Dialog <wbr>仿Spinner


主类



package com.Anson.ExpandableListViewDialogDemo;

import com.Anson.ExpandableListViewDialogDemo.R;

import android.app.Activity;
import android.os.Bundle;
import java.util.ArrayList;
import java.util.List;

import android.app.Dialog;
import android.graphics.Color;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ExpandableListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;

public class ExpandableListViewDialog extends Activity {
  
    private Button btnShowDialog;
    private EditText editText1;
  
    private ExpandableListView elvForDialog;    //Layout expandablelist.xml 中的控件
    private Dialog dialogMarketList;            //弹出类似Spinner选择项的窗口
    private View viewList;                      //设给弹出窗口的view
    private View viewListLastSelected;          //上次选中项的缓存view
  
    List<String> listGroup = new ArrayList<String>();
    List<List<String>> listChild = new ArrayList<List<String>>();
          
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    
        //先给Activity注册界面进度条功能
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
      
        setContentView(R.layout.main);
      
        try{
            editText1 = (EditText) findViewById(R.id.editText1);
          
            btnShowDialog = (Button) findViewById(R.id.btnShowDialog);
            btnShowDialog.setOnClickListener(new OnClickListener(){
                    @Override
                    public void onClick(View view)
                    {              
                        dialogMarketList.show();      
                    }
                    });
          
            createExpandableListViewDialog();
                      
            //Load data in different thread from the main UI
            new Thread(){    
                @Override
                public void run(){
                    //显示TitleBar的进度条
                    setProgressBarIndeterminateVisibility(true);
                  
                    //Methods need time to calculate              
                    for (int i = 0; i < 3; i++) {                  
                        listGroup.add("Group " + i);
                        //Log.v("LH", "Group: " + i);
                      
                        List<String> children = new ArrayList<String>();
                        for (int j = 0; j < 2; j++) {
                            children.add("Group: " + i + "  |  Child: " + j);
                            //Log.v("LH", "Group: " + i + "  |  Child: " + j);
                        }
                        listChild.add(children);
                    }
                    //Send message to handler
                    handler.sendEmptyMessage(0);
                }}.start();
        }
        catch(Exception e)
        {
            showToastMessage(e.toString());          
            Log.v("LH", "ERROR@onCreate: " + e.toString());
        }
    }
          
    private void createExpandableListViewDialog()
    {      
        viewList = ExpandableListViewDialog.this.getLayoutInflater().inflate(R.layout.expandablelist, null);
        dialogMarketList = new Dialog(ExpandableListViewDialog.this);
        dialogMarketList.setContentView(viewList);
      
        dialogMarketList.setTitle("Dialog Demo");
        elvForDialog = (ExpandableListView) viewList.findViewById(R.id.elvForDialog); //Here should use the Dialog view
      
        //绑定ExpandableListView的数据
        MyExpandableListAdapter mAdapter = new MyExpandableListAdapter(ExpandableListViewDialog.this, listGroup, listChild);              
        elvForDialog.setAdapter(mAdapter);
      
      
        elvForDialog.setOnGroupClickListener(new OnGroupClickListener(){
            @Override
            public boolean onGroupClick(ExpandableListView arg0, View arg1,
                    int arg2, long arg3) throws RuntimeException {              
                try{
                    //将上一个选中项的背景清空
                    //viewListLastSelected.setBackgroundDrawable(null);  
                    Log.v("LH", "@setOnGroupClickListener");
                    Log.v("LH", "" + viewListLastSelected.toString());
                    Log.v("LH", "" + ((TextView)viewListLastSelected).getText());
                    //viewListLastSelected.setBackgroundResource(R.drawable.bg_toolbar);
                    //((TextView)viewListLastSelected).setTextColor(Color.BLUE);
                    //Generic.selectedTextViewID = ((TextView)viewListLastSelected).getId();
                  
                }
                catch(Exception e){    Log.v("LH", "ERROR@onCreate: " + e.toString());    }
                return false;
            }                  
        });
      
      
        elvForDialog.setOnChildClickListener(new OnChildClickListener(){
            @Override
            public boolean onChildClick(ExpandableListView arg0, View arg1,
                    int arg2, int arg3, long arg4) throws RuntimeException
            {  
                //Generic.setGroupPosition(arg2);
                //Generic.setChildPosition(arg3);
              
                showToastMessage("[Child Click]:" + arg2 + "|" + arg3 + " -- " + listChild.get(arg2).get(arg3).toString());
              
                //elvForDialog.clearChoices();
                elvForDialog.clearChildFocus(viewListLastSelected);
              
                try{
                    //将上一个选中项的背景清空
                    Log.v("LH", "@setOnChildClickListener");
                    viewListLastSelected.setBackgroundDrawable(null);
                    ((TextView)viewListLastSelected).setTextColor(Color.BLACK);
                    //elvForDialog.getSelectedView().setBackgroundDrawable(null);                  
                }
                catch(Exception e){}
              
                //设置在当前选中项的背景
                arg1.setBackgroundResource(R.drawable.bg_toolbar);
                ((TextView)arg1).setTextColor(Color.WHITE);
              
                //缓存当前选中项至上一个选中项
                viewListLastSelected = arg1;
              
                //Put value to main UI's control
                editText1.setText(listChild.get(arg2).get(arg3).toString());
              
                //Close the dialog
                dialogMarketList.dismiss();
                return false;
            }              
        });      
    }
  
    private void showToastMessage(String value)
    {
        Toast.makeText(ExpandableListViewDialog.this, value, Toast.LENGTH_LONG).show();
    }
  
    
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg){
          
            switch (msg.what) {
                   case 0:   //Success, refresh UI
                       /
package com.Anson.ExpandableListViewDialogDemo;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.graphics.Color;
//import android.util.Log;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseExpandableListAdapter;
import android.widget.TextView;

public class MyExpandableListAdapter extends BaseExpandableListAdapter {
    Activity activity;
    List<String> listGroup = new ArrayList<String>();
    List<List<String>> listChild = new ArrayList<List<String>>();
          
    private int _posGroup = 0;
    private int _posChild = 0;
  
    public MyExpandableListAdapter(Activity a, List<String> group, List<List<String>> children){
        super();
        activity = a;
        listGroup = group;
        listChild = children;
        //Log.v("LH","@MyExpandableListAdapter: ");
    }
  
    @Override
    public Object getChild(int groupPosition, int childPosition) {
        //Log.v("LH", listChild.get(groupPosition).get(childPosition));
        return listChild.get(groupPosition).get(childPosition);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        Log.v("LH", "ChildID: " + childPosition);      
        _posGroup = groupPosition;
        _posChild = childPosition;
        return childPosition;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        //Log.v("LH", "ChildrenCount: " + groupPosition);
        return listChild.get(groupPosition).size();
    }
  
    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {      
        String string = listChild.get(groupPosition).get(childPosition);
      
        //Log.v("LH","@getChildView: " + string);      
        View view = getGenericView(string);
              
        TextView text = (TextView) view;
      
        if(this._posGroup==groupPosition &&
                   this._posChild==childPosition)         
                {
                    text.setTextColor(Color.WHITE);
                    text.setBackgroundResource(R.drawable.bg_toolbar);
                }
      
        return view;
    }


    //group method stub
    @Override
    public Object getGroup(int groupPosition) {
        //Log.v("LH", listGroup.get(groupPosition));
        return listGroup.get(groupPosition);
    }

    @Override
    public int getGroupCount() {
        //Log.v("LH", "GroupCount: " + listGroup.size());
        return listGroup.size();
    }

    @Override
    public long getGroupId(int groupPosition) {
        Log.v("LH", "GroupID: " + groupPosition);
        return groupPosition;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded,
            View convertView, ViewGroup parent) {      
        String string = listGroup.get(groupPosition);      
        //Log.v("LH","@getGroupView: " + string);
        return getGenericView(string);
    }

    //View stub to create Group/Children's View
    public TextView getGenericView(String s) {
        // Layout parameters for the ExpandableListView
        AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
                ViewGroup.LayoutParams.FILL_PARENT, 64);

        lp.height=36;
        TextView text = new TextView(activity);
        text.setLayoutParams(lp);
        // Center the text vertically
        text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);
        // Set the text starting position
        text.setPadding(36, 0, 0, 0);
        text.setTextColor(Color.BLACK);      
        text.setText(s);
              
        return text;
    }
  
    @Override
    public boolean hasStableIds() {      
        return false;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {      
        return true;
    }      
}

========
main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    android:orientation="vertical" android:background="@color/White">

    <TextView android:id="@+id/textView002" android:layout_width="fill_parent"
        android:layout_height="20dip" android:text="" />

    <AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/absTest" android:layout_width="fill_parent"
        android:layout_height="50dip">
        <TextView android:id="@+id/textView1"
            android:layout_width="66dip" android:layout_height="40dip"
            android:text="Selected: " android:paddingTop="10dip" android:paddingLeft="10dip"
            android:textSize="14sp" android:textColor="@color/Black" />
        <EditText android:id="@+id/editText1" android:text=""
            android:layout_x="70dip" android:layout_width="160dip"
            android:layout_height="40dip" android:textSize="14sp"
            android:editable="false" />
        <Button android:id="@+id/btnShowDialog"
            android:layout_width="66dip" android:layout_height="36dip"
            android:text="Show" android:layout_x="236dip" android:textSize="14sp"
            />
    </AbsoluteLayout>
</LinearLayout>


========
expandablelist.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:orientation="vertical"
    android:id="@+id/LinearLayoutGetList"
    android:background="@color/White">
<ExpandableListView  
    android:id="@+id/elvForDialog"
    android:cacheColorHint="#00000000"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" />
</LinearLayout>