Android的AlertDialog详解

转自：http://www.2cto.com/kf/201205/131876.html

参考文章：http://www.cnblogs.com/jiezzy/archive/2012/09/20/2694917.html

http://blog.csdn.net/lizzy115/article/details/6924416

AlertDialog的构造方法全部是Protected的，所以不能直接通过new一个AlertDialog来创建出一个AlertDialog。

要创建一个AlertDialog，就要用到AlertDialog.Builder中的create()方法。

使用AlertDialog.Builder创建对话框需要了解以下几个方法：

setTitle ：为对话框设置标题setIcon ：为对话框设置图标setMessage：为对话框设置内容setView ：给对话框设置自定义样式setItems ：设置对话框要显示的一个list，一般用于显示几个命令时setMultiChoiceItems ：用来设置对话框显示一系列的复选框setNeutralButton ：普通按钮

setPositiveButton ：给对话框添加"Yes"按钮

setNegativeButton ：对话框添加"No"按钮

create ： 创建对话框show ：显示对话框
一、简单的AlertDialog
下面，创建一个简单的ALertDialog并显示它：

import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.os.Bundle;  public class Dialog_AlertDialogDemoActivity extends Activity {     /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);          Dialog alertDialog = new AlertDialog.Builder(this).                 setTitle("对话框的标题").                 setMessage("对话框的内容").                 setIcon(R.drawable.ic_launcher).                 create();         alertDialog.show();     } }

运行结果如下：

二、带按钮的AlertDialog

上面的例子很简单，下面我们在这个AlertDialog上面加几个Button，实现删除操作的提示对话框

import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.DialogInterface; import android.os.Bundle;  public class Dialog_AlertDialogDemoActivity extends Activity {     /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);          Dialog alertDialog = new AlertDialog.Builder(this).                 setTitle("确定删除？").                 setMessage("您确定删除该条信息吗？").                 setIcon(R.drawable.ic_launcher).                 setPositiveButton("确定", new DialogInterface.OnClickListener() {                                          @Override                     public void onClick(DialogInterface dialog, int which) {                         // TODO Auto-generated method stub                      }                 }).                 setNegativeButton("取消", new DialogInterface.OnClickListener() {                                          @Override                     public void onClick(DialogInterface dialog, int which) {                         // TODO Auto-generated method stub                      }                 }).                 setNeutralButton("查看详情", new DialogInterface.OnClickListener() {                                          @Override                     public void onClick(DialogInterface dialog, int which) {                         // TODO Auto-generated method stub                      }                 }).                 create();         alertDialog.show();     } }

运行结果如下：

三、类似ListView的AlertDialog
用setItems(CharSequence[] items, final OnClickListener listener)方法来实现类似ListView的AlertDialog

第一个参数是要显示的数据的数组，第二个参数是点击某个item的触发事件

import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.DialogInterface; import android.os.Bundle; import android.widget.Toast;  public class Dialog_AlertDialogDemoActivity extends Activity {     /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);          final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" };          Dialog alertDialog = new AlertDialog.Builder(this).                 setTitle("你喜欢吃哪种水果？").                 setIcon(R.drawable.ic_launcher)                 .setItems(arrayFruit, new DialogInterface.OnClickListener() {                       @Override                     public void onClick(DialogInterface dialog, int which) {                         Toast.makeText(Dialog_AlertDialogDemoActivity.this, arrayFruit[which], Toast.LENGTH_SHORT).show();                     }                 }).                 setNegativeButton("取消", new DialogInterface.OnClickListener() {                      @Override                     public void onClick(DialogInterface dialog, int which) {                         // TODO Auto-generated method stub                      }                 }).                 create();         alertDialog.show();     } }

运行结果如下：

四、类似RadioButton的AlertDialog
用setSingleChoiceItems(CharSequence[] items, int checkedItem, final OnClickListener listener)方法来实现类似RadioButton的AlertDialog

第一个参数是要显示的数据的数组，第二个参数是初始值（初始被选中的item），第三个参数是点击某个item的触发事件

在这个例子里面我们设了一个selectedFruitIndex用来记住选中的item的index

import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.DialogInterface; import android.os.Bundle; import android.widget.Toast;  public class Dialog_AlertDialogDemoActivity extends Activity {          private int selectedFruitIndex = 0;          /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);          final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" };          Dialog alertDialog = new AlertDialog.Builder(this).                 setTitle("你喜欢吃哪种水果？").                 setIcon(R.drawable.ic_launcher)                 .setSingleChoiceItems(arrayFruit, 0, new DialogInterface.OnClickListener() {                       @Override                     public void onClick(DialogInterface dialog, int which) {                         selectedFruitIndex = which;                     }                 }).                 setPositiveButton("确认", new DialogInterface.OnClickListener() {                      @Override                     public void onClick(DialogInterface dialog, int which) {                         Toast.makeText(Dialog_AlertDialogDemoActivity.this, arrayFruit[selectedFruitIndex], Toast.LENGTH_SHORT).show();                     }                 }).                 setNegativeButton("取消", new DialogInterface.OnClickListener() {                      @Override                     public void onClick(DialogInterface dialog, int which) {                         // TODO Auto-generated method stub                      }                 }).                 create();         alertDialog.show();     } }

运行结果如下：

五、类似CheckBox的AlertDialog
用setMultiChoiceItems(CharSequence[] items, boolean[] checkedItems, final OnMultiChoiceClickListener listener)方法来实现类似CheckBox的AlertDialog
第一个参数是要显示的数据的数组，第二个参数是选中状态的数组，第三个参数是点击某个item的触发事件

import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.DialogInterface; import android.os.Bundle; import android.widget.Toast;  public class Dialog_AlertDialogDemoActivity extends Activity {     /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);          final String[] arrayFruit = new String[] { "苹果", "橘子", "草莓", "香蕉" };         final boolean[] arrayFruitSelected = new boolean[] {true, true, false, false};          Dialog alertDialog = new AlertDialog.Builder(this).                 setTitle("你喜欢吃哪种水果？").                 setIcon(R.drawable.ic_launcher)                 .setMultiChoiceItems(arrayFruit, arrayFruitSelected, new DialogInterface.OnMultiChoiceClickListener() {                                          @Override                     public void onClick(DialogInterface dialog, int which, boolean isChecked) {                         arrayFruitSelected[which] = isChecked;                     }                 }).                 setPositiveButton("确认", new DialogInterface.OnClickListener() {                      @Override                     public void onClick(DialogInterface dialog, int which) {                         StringBuilder stringBuilder = new StringBuilder();                         for (int i = 0; i < arrayFruitSelected.length; i++) {                             if (arrayFruitSelected[i] == true)                             {                                 stringBuilder.append(arrayFruit[i] + "、");                             }                         }                         Toast.makeText(Dialog_AlertDialogDemoActivity.this, stringBuilder.toString(), Toast.LENGTH_SHORT).show();                     }                 }).                 setNegativeButton("取消", new DialogInterface.OnClickListener() {                      @Override                     public void onClick(DialogInterface dialog, int which) {                         // TODO Auto-generated method stub                      }                 }).                 create();         alertDialog.show();     } }

运行结果如下：

六、自定义View的AlertDialog
有时候我们不能满足系统自带的AlertDialog风格，就比如说我们要实现一个Login画面，有用户名和密码，这时我们就要用到自定义View的AlertDialog

先创建Login画面的布局文件

[html] <?xml version="1.0" encoding="utf-8"?>                                                                  <?xml version="1.0" encoding="utf-8"?>                                                然后在Activity里面把Login画面的布局文件添加到AlertDialog上[java] package com.tianjf;  import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.DialogInterface; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View;  public class Dialog_AlertDialogDemoActivity extends Activity {     /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);          // 取得自定义View          LayoutInflater layoutInflater = LayoutInflater.from(this);         View myLoginView = layoutInflater.inflate(R.layout.login, null);                  Dialog alertDialog = new AlertDialog.Builder(this).                 setTitle("用户登录").                 setIcon(R.drawable.ic_launcher).                 setView(myLoginView).                 setPositiveButton("登录", new DialogInterface.OnClickListener() {                      @Override                     public void onClick(DialogInterface dialog, int which) {                         // TODO Auto-generated method stub                      }                 }).                 setNegativeButton("取消", new DialogInterface.OnClickListener() {                      @Override                     public void onClick(DialogInterface dialog, int which) {                         // TODO Auto-generated method stub                      }                 }).                 create();         alertDialog.show();     } }

运行结果如下：

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