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：