Android使用AlertDialog创建对话框

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:id="@+id/layout1"  android:gravity="center_horizontal"  >  <Button android:id="@+id/button1"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:text="显示带取消、中立和确定按钮的对话框"/>  <Button android:id="@+id/button2"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:text="显示列表的对话框"/>  <Button android:id="@+id/button3"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:text="显示带单选列表对话框"/>  <Button android:id="@+id/button4"   android:layout_width="wrap_content"   android:layout_height="wrap_content"   android:text="显示带多选列表对话框"/> </LinearLayout> 

package com.example.test;  import android.app.Activity; import android.app.AlertDialog; import android.app.AlertDialog.Builder; import android.content.DialogInterface; import android.content.DialogInterface.OnMultiChoiceClickListener; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast;  public class MainActivity extends Activity {  private boolean[] checkedItems;//记录各个列表项的状态  private String[] items;//各列表项要显示的内容  @Override  public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.main);      //显示带取消、中立和确定按钮的对话框   Button button1=(Button)findViewById(R.id.button1);   button1.setOnClickListener(new OnClickListener() {        @Override    public void onClick(View arg0) {     AlertDialog alert=new AlertDialog.Builder(MainActivity.this).create();     alert.setIcon(R.drawable.ic_launcher);//设置对话框的图标     alert.setTitle("系统提示");//设置对话框的标题     alert.setMessage("显示带取消、中立和确定按钮的对话框！");//设置对话框显示的内容     //添加“取消”按钮     alert.setButton(DialogInterface.BUTTON_NEGATIVE, "取消",       new DialogInterface.OnClickListener() {         @Override       public void onClick(DialogInterface dialog,int which) {        Toast.makeText(MainActivity.this, "您单击了取消按钮", Toast.LENGTH_SHORT).show();       }     });     //添加“确定”按钮     alert.setButton(DialogInterface.BUTTON_POSITIVE, "确定",       new DialogInterface.OnClickListener() {         @Override       public void onClick(DialogInterface dialog,int which) {        Toast.makeText(MainActivity.this, "您单击了确定按钮", Toast.LENGTH_SHORT).show();       }     });     //添加“中立”按钮     alert.setButton(DialogInterface.BUTTON_NEUTRAL, "中立",       new DialogInterface.OnClickListener() {         @Override       public void onClick(DialogInterface dialog,int which) {        Toast.makeText(MainActivity.this, "您单击了中立按钮", Toast.LENGTH_SHORT).show();       }     });     alert.show();//显示对话框    }   });         //显示列表的对话框   Button button2=(Button)findViewById(R.id.button2);   button2.setOnClickListener(new OnClickListener() {        @Override    public void onClick(View arg0) {     final String[] items=new String[]{"唱歌","跳舞","美术","远足旅行","摄影"};     Builder builder=new AlertDialog.Builder(MainActivity.this);     builder.setIcon(R.drawable.in);     builder.setTitle("请选择你的爱好：");     //添加列表项     builder.setItems(items, new DialogInterface.OnClickListener() {        @Override      public void onClick(DialogInterface dialog, int which) {       Toast.makeText(MainActivity.this, "您选择了"+items[which],Toast.LENGTH_SHORT).show();      }     });     builder.create().show();//创建对话框并显示    }   });      //显示带单选列表对话框   Button button3=(Button)findViewById(R.id.button3);   button3.setOnClickListener(new OnClickListener() {        @Override    public void onClick(View arg0) {     final String[] items=new String[]{"标准","无声","会议","户外","离线"};     Builder builder=new AlertDialog.Builder(MainActivity.this);     builder.setIcon(R.drawable.music);     builder.setTitle("请选择要使用的情景模式:");     builder.setSingleChoiceItems(items, 0, new DialogInterface.OnClickListener(){        @Override      public void onClick(DialogInterface dialog, int which) {       Toast.makeText(MainActivity.this, "您选择了"+items[which],Toast.LENGTH_SHORT).show();      }           });     builder.setPositiveButton("确定", null);     builder.create().show();//创建对话框并显示    }   });      //显示带多选列表对话框   Button button4=(Button)findViewById(R.id.button4);   button4.setOnClickListener(new OnClickListener() {        @Override    public void onClick(View arg0) {     checkedItems =new boolean[]{false,true,false,true,false};//记录各列表的状态     //各列表项要显示的内容     items=new String[]{"植物大战僵尸","愤怒的小鸟","泡泡龙","开心消消乐","地铁跑酷"};     //显示带单选列表框的对话框     Builder builder=new AlertDialog.Builder(MainActivity.this);     builder.setIcon(R.drawable.setting);     builder.setTitle("请选择您喜欢的游戏:");     builder.setMultiChoiceItems(items, checkedItems, new OnMultiChoiceClickListener() {            @Override      public void onClick(DialogInterface dialog, int which, boolean isChecked) {       checkedItems[which]=isChecked;      }     });     //为对话框添加"确定"按钮     builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {            @Override      public void onClick(DialogInterface dialog, int which) {       String result="";       for (int i = 0; i <checkedItems.length; i++) {        if(checkedItems[i]){         result+=items[i]+"、";        }       }       //当result不为空时，通过消息提示框显示选择的结果       if(!"".equals(result)){        result=result.substring(0,result.length()-1);//去掉最后的"、"号        Toast.makeText(MainActivity.this, "您选择了:["+result+"]",Toast.LENGTH_SHORT).show();       }      }     });     builder.create().show();//创建对话框并显示    }   });  } }