Android之对话框的实现

1.自定义对话框

下面我们要自定义的对话框，包括两个TextView和两个EditText，所以需要在布局文件中定义这个对话框界面，实现如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >
    
	<TextView 
	    	android:id="@+id/username"
	    	android:layout_height="wrap_content"
	    	android:layout_width="wrap_content"
	    	android:layout_marginLeft="20dip"
	    	android:layout_marginRight="20dip"
	    	android:text="账号"
	    	android:gravity="left"
	    	android:textAppearance="?android:attr/textAppearanceMedium"
	    />
	
	<EditText 
	    	android:id="@+id/username"
	    	android:layout_height="wrap_content"
	    	android:layout_width="fill_parent"
	    	android:layout_marginLeft="20dip"
	    	android:layout_marginRight="20dip"
	    	android:scrollHorizontally="true"
	    	android:autoText="false"
	    	android:capitalize="none"
	    	android:gravity="fill_horizontal"
	    	android:textAppearance="?android:attr/textAppearanceMedium"
	    />
   
		<TextView 
		    	android:id="@+id/password"
		    	android:layout_height="wrap_content"
	    		android:layout_width="wrap_content"
	    		android:layout_marginLeft="20dip"
	    		android:layout_marginRight="20dip"
	    		android:text="密码"
	    		android:gravity="left"
	    		android:textAppearance="?android:attr/textAppearanceMedium"
		    />
		
		<EditText 
	    	android:id="@+id/password"
	    	android:layout_height="wrap_content"
	    	android:layout_width="fill_parent"
	    	android:layout_marginLeft="20dip"
	    	android:layout_marginRight="20dip"
	    	android:scrollHorizontally="true"
	    	android:autoText="false"
	    	android:capitalize="none"
	    	android:gravity="fill_horizontal"
	    	android:password="true"
	    	android:textAppearance="?android:attr/textAppearanceMedium"
	    />
</LinearLayout>

2. 使用AlertDialog来创建对话框

使用AlertDialog来创建对话框需要知道下面几个方法:

setTitle()：设置标题

setIcon()：设置图标

setMessage()：设置对话框的提示信息

setItems()：设置对话框要显示的一个list，一般用于几个命令时

setSingleChoiceItems()：设置对话框要显示一个单选的List

setMultiChoiceItems()：用来设置对话框显示的一系列的复选框

setPositiveButton()：给对话框添加yes按钮

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setNegativeButton()：给对话框添加No按钮。

package com.example.mydialog;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;

public class MainActivity extends Activity {
	
	ProgressDialog m_Dialog;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		Dialog dialog = new AlertDialog.Builder(MainActivity.this)
											.setTitle("登陆提示")
											.setMessage("这里需要登陆")
											.setPositiveButton("确定", new MyDialogClickListener())
											.setNeutralButton("退出", new DialogInterface.OnClickListener() {
												@Override
												public void onClick(DialogInterface dialog, int whichButton) {
													MainActivity.this.finish();
												}
											}).create();
		dialog.show();
	}
	
	class MyDialogClickListener implements DialogInterface.OnClickListener{
		@Override
		public void onClick(DialogInterface arg0, int arg1) {
			//点击确定之后转向登陆框
			LayoutInflater factory = LayoutInflater.from(MainActivity.this);
			//得到自定义对话框
			final View DialogView = factory.inflate(R.layout.dialog, null);
			//创建对话框
			AlertDialog dlg = new AlertDialog.Builder(MainActivity.this)
											.setTitle("登陆框")
											.setView(DialogView)
											.setPositiveButton("确定", new DialogInterface.OnClickListener() {
												@Override
												public void onClick(DialogInterface dialog, int whichButton) {
													//输入完成后，点击"确定"开始登陆
													m_Dialog = ProgressDialog.show(MainActivity.this, "请等待...","正在为您登陆...",true);
													new Thread(){
														public void run(){
															try{
																sleep(3000);
															}catch(Exception e){
																e.printStackTrace();
															}finally{
																//登陆结束，取消m_Dialog对话框
																m_Dialog.dismiss();
															}
														}
													}.start();
												}
											}).setNegativeButton("取消", new DialogInterface.OnClickListener() {
												@Override
												public void onClick(DialogInterface dialog, int whichButton) {
													//点击"取消"按钮之后退出程序
													MainActivity.this.finish();
												}
											}).create();
			dlg.show();
		}
	}
}