AlertDialog练习

package com.unet;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;

public class ChoiceDialog extends Activity{
	ButtonOnClick buttonOnClick=new ButtonOnClick(1);//单选，多选下拉框的按钮监听
	ListView lv=null;
	private String [] provines=new String[]{"辽宁省","陕西","日本","美国","美女"};
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.controls);
		Button listBtn=(Button)this.findViewById(R.id.ListChoiceBtn);
		Button singBtn=(Button)this.findViewById(R.id.SingleChoiceBtn);
		Button multiBtn=(Button)this.findViewById(R.id.MultiChoiceBtn);
		BtnListener btnListener=new BtnListener();
		listBtn.setOnClickListener(btnListener);
		singBtn.setOnClickListener(btnListener);
		multiBtn.setOnClickListener(btnListener);
		
		
	}
	class BtnListener implements Button.OnClickListener{

		@Override
		public void onClick(View v) {
			switch(v.getId()){
			
				case R.id.ListChoiceBtn :{
					showListDialog(); 
					break;
				}
				case R.id.SingleChoiceBtn :{
					
					showSingleChoiceDialog();
					break;
				}
				case R.id.MultiChoiceBtn :{
					showMultiChoiceDialog();
					break;
				}
			
			}
			
		}
		
		
	}
	
	private void showListDialog(){
		//Builder的方法setTitle(Stirng str)设置下拉列表框的头
		//Builder的方法setItems(内容数组，内容监听)设置下拉列表框的内容 简单列表框
		new AlertDialog.Builder(ChoiceDialog.this).setTitle("选择省份")
		.setItems(provines, new DialogInterface.OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				final AlertDialog ad=new AlertDialog.Builder(ChoiceDialog.this)
				.setMessage("你选择了"+which+provines[which]).show();
						
			}
		}).show();	
	}
	private void showSingleChoiceDialog(){
		
		new AlertDialog.Builder(ChoiceDialog.this).setTitle("选择省份")
		//Builder的方法setSingleChoiceItems(内容数组,默认项,监听)是设置下拉单选框返回值为Builder
		.setSingleChoiceItems(provines, 1, buttonOnClick).setPositiveButton("确定",
				buttonOnClick).setNegativeButton("取消", buttonOnClick).show();
		
	}
	private void showMultiChoiceDialog(){
		AlertDialog ad=new AlertDialog.Builder(ChoiceDialog.this).setTitle("选择省份")
				.setMultiChoiceItems(provines, new boolean[]{false,true,false,true,false}, new DialogInterface.OnMultiChoiceClickListener() {
					
					@Override
					public void onClick(DialogInterface dialog, int which, boolean isChecked) {}
				}).setPositiveButton("确定", new DialogInterface.OnClickListener() {
				// Builder的方法setpositiveButton()是专门设置确定按钮的	
					@Override
					public void onClick(DialogInterface dialog, int which) {
						int count=lv.getCount();
						String s="你选择了：";
						for(int i=0;i<provines.length;i++){
					//ListView的方法getCheckedItemPositions()得到的是（true,多选框中选中的编号）键值对，		
							if(lv.getCheckedItemPositions().get(i)){  //判断编号为i的多选框是否被选中
								s+=i+":"+lv.getAdapter().getItem(i)+" "; //通过适配器得到选项
							}
			
						}
						if(lv.getCheckedItemPositions().size()>0){
												// Builder的方法setMessage(String str)的返回值是AlertDialog
							new AlertDialog.Builder(ChoiceDialog.this).setMessage(s).show();
						}
						else{
							new AlertDialog.Builder(ChoiceDialog.this).setMessage("你TM没选!").show();
						}
						
					}
					//Builder的方法setNegativeButton()是专门设置取消按钮的
				}).setNegativeButton("取消", null).create(); //Builder的方法create()可以创建一个AlertDialog
		    lv = ad.getListView();//AlertDialog的方法getListView()可以得到一个ListView对象
		    ad.show();
		
		
	}
	private class ButtonOnClick implements DialogInterface.OnClickListener{

		private int index;
		public ButtonOnClick(int index){
			this.index=index;
		}
		public void onClick(DialogInterface dialog, int which) {
			if(which>=0){
				index=which;
				
			}else{
				if(which==DialogInterface.BUTTON_POSITIVE){
					new AlertDialog.Builder(ChoiceDialog.this)
					.setMessage("您已经选择了:"+index+":"+provines[index]).show();
					
				}else if(which==DialogInterface.BUTTON_NEGATIVE){
					new AlertDialog.Builder(ChoiceDialog.this)
					.setMessage("你TM什么也没选!").show();
					
				}
				
			}
		
			
			
		}
		
		
		
	}

}