Android入门第九篇之AlertDialog

本文来自http://blog.csdn.net/hellogv/ ，引用必须注明出处！

时隔一年，又要准备做Android的开发了，最近复习和整理一下Android的知识。这次要说的是AlertDialog，这种对话框会经常遇到。AlertDialog跟WIN32开发中的Dialog不一样，AlertDialog是非阻塞的，而阻塞的对话框用的是PopupWindow。

先贴出程序运行的截图：



main.xml的源码：

[xhtml] view
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<?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"

>

<Button android:id="@+id/Button01" android:layout_height="wrap_content" android:text="非Layout型对话框" android:layout_width="fill_parent"></Button>

<Button android:id="@+id/Button02" android:layout_height="wrap_content" android:text="Layout型对话框" android:layout_width="fill_parent"></Button><View android:id="@+id/View01" android:layout_width="wrap_content" android:layout_height="wrap_content"></View>

</LinearLayout>

下图是非Layout型对话框，直接使用AlertDialog



下图是使用了Layout的对话框，可以自定义控件，实现更复杂的对话框



dialoglayout.xml的源码：

[xhtml] view
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<?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">

<EditText android:layout_height="wrap_content"

android:layout_width="fill_parent" android:layout_marginLeft="20dip"

android:layout_marginRight="20dip" android:textAppearance="?android:attr/textAppearanceMedium" android:id="@+id/edtInput"/>

</LinearLayout>

程序源码：

[java] view
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package com.testAlertDialog;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.Context;

import android.content.DialogInterface;

import android.os.Bundle;

import android.view.Gravity;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.PopupWindow;

public class testAlertDialog extends Activity {

Button btnShowDialog;

Button btnShowDialog_Layout;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

//定义按钮

btnShowDialog=(Button)this.findViewById(R.id.Button01);

btnShowDialog.setOnClickListener(new ClickEvent());

btnShowDialog_Layout=(Button)this.findViewById(R.id.Button02);

btnShowDialog_Layout.setOnClickListener(new ClickEvent());

}

//统一处理按键事件

class ClickEvent implements OnClickListener{

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

if(v==btnShowDialog)

showDialog(testAlertDialog.this);

else if(v==btnShowDialog_Layout)

showDialog_Layout(testAlertDialog.this);

}

}

//显示基本的AlertDialog

private void showDialog(Context context) {

AlertDialog.Builder builder = new AlertDialog.Builder(context);

builder.setIcon(R.drawable.icon);

builder.setTitle("Title");

builder.setMessage("Message");

builder.setPositiveButton("Button1",

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int whichButton) {

setTitle("点击了对话框上的Button1");

}

});

builder.setNeutralButton("Button2",

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int whichButton) {

setTitle("点击了对话框上的Button2");

}

});

builder.setNegativeButton("Button3",

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int whichButton) {

setTitle("点击了对话框上的Button3");

}

});

builder.show();

}

//显示基于Layout的AlertDialog

private void showDialog_Layout(Context context) {

LayoutInflater inflater = LayoutInflater.from(this);

final View textEntryView = inflater.inflate(

R.layout.dialoglayout, null);

final EditText edtInput=(EditText)textEntryView.findViewById(R.id.edtInput);

final AlertDialog.Builder builder = new AlertDialog.Builder(context);

builder.setCancelable(false);

builder.setIcon(R.drawable.icon);

builder.setTitle("Title");

builder.setView(textEntryView);

builder.setPositiveButton("确认",

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int whichButton) {

setTitle(edtInput.getText());

}

});

builder.setNegativeButton("取消",

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int whichButton) {

setTitle("");

}

});

builder.show();

}

}