Android学习第十一天----AlertDialog

本文介绍了一个Android应用中的交互流程，通过点击按钮显示对话框，并在选择选项后展示进度对话框，利用线程实现延迟消失，展示了Android应用中对话框与进度条的使用方法。

项目需求：通过点击按钮，显示出来一个对话框，选择其中一个选项之后出来一个进度对话框，一段时间之后自动消失。

xml文件中

<RelativeLayout 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" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="160dp"
        android:text="点我" />

</RelativeLayout>

MainActivity中：

package com.example.alertdialog_3;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity
{
    private String[] info = {"北京","上海","天津"};
    private Button mButton;
    private AlertDialog.Builder mBuilder ;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        mButton = (Button)findViewById(R.id.button1);
        mButton.setOnClickListener(new View.OnClickListener()
        {
            
            @Override
            public void onClick(View v)
            {
                mBuilder = new AlertDialog.Builder(MainActivity.this);
                
                mBuilder.setTitle("你好！");
                mBuilder.setIcon(R.drawable.ic_launcher);
                
                mBuilder.setItems(info, new OnClickListener()
                {
                    
                    @Override
                    public void onClick(DialogInterface dialog, int which)
                    {
                        if(which == 0)
                        {
                            
                        
                            final ProgressDialog mProgressDialog = new ProgressDialog(MainActivity.this);
                            
                            mProgressDialog.setTitle("hello");
                            mProgressDialog.setMessage("heihe");
                            mProgressDialog.show();
                            
                            new Thread()
                            {
                                public void run()
                                {
                                    try
                                    {
                                        Thread.sleep(5* 1000);
                                        mProgressDialog.dismiss();
                                    } catch (InterruptedException e)
                                    {
                                        // TODO Auto-generated catch block
                                        e.printStackTrace();
                                    }
                                }
                            }.start();
                            
                        }
                        

                    }
                });
                mBuilder.create();
                mBuilder.show();
            }
        });
        
    }

}