AlertDialog练习，,package com.

AlertDialog练习，,package com.

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();                }            }        }    }}//该片段来自于http://byrx.net