AlertDialog提示对话框练习

闲来无事，就练习了下AlertDialog对话框。

首先写了三个button，分别打开一般对话框，单选列表对话框和复选对话框。

xml代码

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".MainActivity"
     android:orientation="vertical">

     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="提示对话框"
         android:onClick="listener1"/>

     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="单选对话框"
         android:onClick="listener2"/>
      <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="复选对话框"
         android:onClick="listener3"/>
 </LinearLayout>

java代码：

 package com.dj.alertdialogtest;

 import android.os.Bundle;
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.AlertDialog.Builder;
 import android.app.Dialog;
 import android.content.DialogInterface;
 import android.view.Menu;
 import android.view.View;
 import android.widget.Button;
 import android.widget.Toast;

 public class MainActivity extends Activity {
      AlertDialog.Builder dialog=null;
     private int num;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
     }

     /**显示对话框*/
     public void listener1(View v){
         dialog=new AlertDialog.Builder(MainActivity.this);//初始化显示对话框
         dialog.setIcon(R.drawable.ic_launcher);//设置对话框的图标
         dialog.setTitle("调查");//设置对话框的标题
         dialog.setMessage("假如给你一百万你想做什么？");//设置对话框的内容信息

         /**设置对话的三个button按钮*/
         dialog.setPositiveButton("捐款",new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialog, int which) {
                 Toast.makeText(getApplicationContext(), "我要做有意思的事！", Toast.LENGTH_LONG).show();
             }
         });
         dialog.setNegativeButton("旅游", new DialogInterface.OnClickListener() {

             @Override
             public void onClick(DialogInterface dialog, int which) {
                 Toast.makeText(getApplicationContext(), "我要好好活！", Toast.LENGTH_LONG).show();
             }
         });

         dialog.setNeutralButton("坐吃等死", new DialogInterface.OnClickListener() {

             @Override
             public void onClick(DialogInterface dialog, int which) {
                 Toast.makeText(getApplicationContext(), "我要坐吃等死！", Toast.LENGTH_LONG).show();
             }
         });
         dialog.create();//创建
         dialog.show();//将设置完的对话框显示出来
     }

     /**以下是单选列表对话框*/
     public void listener2(View v){
         AlertDialog.Builder dialog=new AlertDialog.Builder(this);
         final String[] str={"鱼香肉丝","宫保鸡丁","回锅肉","东坡肉"};//设置列表的元素
         dialog.setIcon(R.drawable.ic_launcher);//设置图标
         dialog.setTitle("选择你喜欢的食物");//设置标题
         /**设置单选列表对话框。第一个参数为列表元素，以字符串数组承装；
          * 第二个参数是默认选中的元素，0表示第一个*/
         dialog.setSingleChoiceItems(str, 0, new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialog, int which) {
                 num=which;//which表示哪个下标被选中
             }
         });
         dialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialog, int which) {
                 String temp="你喜欢的食物是：";
                 //str[num]表示选中的是哪个食物
                 Toast.makeText(getApplicationContext(), temp+str[num], Toast.LENGTH_LONG).show();
             }
         });
         dialog.create();
         dialog.show();
     }

     /**复选列表对话框*/
     public void listener3(View v){
         AlertDialog.Builder dialog=new AlertDialog.Builder(this);
         final String[] str={"王力宏","周杰伦","王菲","那英"};
         final boolean[] flags={true,false,true,false};
         dialog.setIcon(R.drawable.ic_launcher);//设置图标
         dialog.setTitle("你喜欢的歌手是");
         dialog.setMultiChoiceItems(str, flags, new DialogInterface.OnMultiChoiceClickListener() {

             @Override
             public void onClick(DialogInterface arg0, int which, boolean isChecked) {
                 flags[which]=isChecked;//哪一项被选中
             }
         });
         dialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {

             @Override
             public void onClick(DialogInterface dialog, int which) {
                 String temp="你喜欢的歌手是：";
                 for (int i = 0; i < flags.length; i++) {
                     if(flags[i]){
                         temp+=str[i];
                     }
                 }
                 Toast.makeText(getApplicationContext(), temp, Toast.LENGTH_LONG).show();
             }
         });
         dialog.create();
         dialog.show();
     }
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }

 }

演示效果：