AlertDialog简析

最新推荐文章于 2024-11-28 10:48:35 发布

原创最新推荐文章于 2024-11-28 10:48:35 发布 · 389 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#AlertDialog #Dialog #对话框

其他专栏收录该内容

4 篇文章

订阅专栏

本文详细介绍了AlertDialog的使用方法，包括创建对话框、设置标题、图标、内容等基本操作，以及如何添加按钮并设置点击事件。此外还展示了如何通过AlertDialog实现列表选择、单选框和复选框等功能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

AlertDialog.builer创建对话框。

常用方法：

setTitle 设置标题
setIcon 设置图标
setMessage 设置内容
setItems 设置对话框中显示的项目列表
setView 设置自定义样式

setSingleChoiceItems 设置对话框显示一个单选框
setMultiChoiceItems 设置对话框显示一系列的复选框

setPositiveButton 对话框添加确定按钮
setNegativeButton 对话框添加取消按钮
setNeutralButton 普通按钮
create 创建对话框
show 显示对话框

简单的AlertDialog对话框

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		Dialog alertDialog = new AlertDialog.Builder(this)     //创建对话框
   			.setTitle("简单对话框")    //设置标题
   			.setMessage("hello")    //设置内容
   			.setIcon(R.drawable.ic_launcher)  //设置图标
   			.create();     	//完成对话框的创建
		alertDialog.show();     //显示对话框
 	}
}

效果图：

带按钮的AlertDialog对话框

在上面加几个Button，实现删除操作的提示对话框

     setPositiveButton
     setNegativeButton
     setNeutralButton

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		Dialog alertDialog = new AlertDialog.Builder(this)
			.setTitle("确定删除？")
			.setMessage("您确定删除这条消息吗？")
			.setIcon(R.drawable.ic_launcher)
			.setPositiveButton("确定", new DialogInterface.OnClickListener() {	//添加确定按钮
				@Override
				public void onClick(DialogInterface dialog, int which) {
					// TODO Auto-generated method stub
				}
			})
			.setNegativeButton("取消", new DialogInterface.OnClickListener() {	//添加取消按钮
				@Override
				public void onClick(DialogInterface dialog, int which) {
					// TODO Auto-generated method stub
				}
			})
			.setNeutralButton("查看详情", new DialogInterface.OnClickListener() {	//添加普通按钮
				@Override
				public void onClick(DialogInterface dialog, int which) {
					// TODO Auto-generated method stub
				}
			})
			.create();
		alertDialog.show();
	}
}

效果图：

类似ListView的AlertDialog对话框

//核心方法 setItems(CharSequence[] items, final OnClickListener listener)

//参数1，要显示的数据的数组

//参数2，点击某个item的触发事件

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		final String[] arrayWarringStates = new String[] { "齐", "楚", "秦", "燕", "赵", "魏", "韩" };

		Dialog alertDialog = new AlertDialog.Builder(this)
			.setTitle("你喜欢哪个国家？")
			.setIcon(R.drawable.ic_launcher)
			.setItems(arrayWarringStates, new DialogInterface.OnClickListener() { //设置对话框中显示的项目列表
				@Override
				public void onClick(DialogInterface dialog, int which) {
					Toast.makeText(MainActivity.this,
						"您加入了"+arrayWarringStates[which]+"国", 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();
	}
}

效果图：

类似RadioButton的AlertDialog

//核心方法 setSingleChoiceItems(CharSequence[] items, int checkedItem, final OnClickListener listener)

//参数1，要显示的数据的数组

//参数2，初始值（初始被选中的item），

//参数3，点击某个item的触发事件

public class MainActivity extends Activity {

	private int selectedCountryIndex = 0;		//默认选择项

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		final String[] arrayWarringStates = new String[] { "齐", "楚", "秦", "燕","赵", "魏", "韩" };

		Dialog alertDialog = new AlertDialog.Builder(this)
			.setTitle("你喜欢哪个国家？")
			.setIcon(R.drawable.ic_launcher)
			//设置对话框显示一个单选框
			.setSingleChoiceItems(arrayWarringStates, selectedCountryIndex,new DialogInterface.OnClickListener() {
				@Override
				public void onClick(DialogInterface dialog,int which) {
					selectedCountryIndex = which;
				}
			})
			.setPositiveButton("确认", new DialogInterface.OnClickListener() {
				@Override
				public void onClick(DialogInterface dialog, int which) {
					Toast.makeText(MainActivity.this,
				"您加入了"+arrayWarringStates[selectedCountryIndex]+"国",Toast.LENGTH_SHORT).show();
					// 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();
	}
}

效果图：

类似CheckBox的AlertDialog对话框

//核心方法setMultiChoiceItems(CharSequence[] items, boolean[] checkedItems, final OnMultiChoiceClickListener listener)

//参数1，要显示的数据的数组，

//参数2，选中状态的数组，

//参数3，点击某个item的触发事件

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		final String[] arrayWarringStates = new String[] { "齐", "楚", "秦", "燕","赵", "魏", "韩" };

		//选项初始化
        	final boolean[] selectedCountryIndex = new boolean[] {true, true, false, false, false, false, false}; 	
 
       		Dialog alertDialog = new AlertDialog.Builder(this)
		.setTitle("你喜欢哪个国家？")
		.setIcon(R.drawable.ic_launcher)
		//设置对话框显示一系列的复选框 
		.setMultiChoiceItems(arrayWarringStates,selectedCountryIndex,new  DialogInterface.OnMultiChoiceClickListener() {                   
                    @Override 
                    public void onClick(DialogInterface dialog, int which, boolean isChecked) { 
                    	selectedCountryIndex[which] = isChecked; 
                    } 
                })
		.setPositiveButton("确认", new DialogInterface.OnClickListener() {
                    @Override 
                    public void onClick(DialogInterface dialog, int which) { 
                        StringBuilder stringBuilder = new StringBuilder(); 		//判断复选结果
                        for (int i = 0; i < selectedCountryIndex.length; i++) { 
                            if (selectedCountryIndex[i] == true) 
                            { 								//字符串，用”、”把选项连接起来
                                stringBuilder.append(arrayWarringStates[i] + "、");
                            } 
                        } 
                        Toast.makeText(MainActivity.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(); 
    } 
}

效果图：

自定义View的AlertDialog

//核心方法 setView

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		// 取得自定义View
		// 动态加载布局生成View对象
		LayoutInflater layoutInflater = LayoutInflater.from(this);            
		View myloginView = layoutInflater.inflate(R.layout.activity_main, null);

		Dialog alertDialog = new AlertDialog.Builder(this)
			.setTitle("用户登录")
			.setIcon(R.drawable.ic_launcher)
			.setView(myloginView)
			.setNegativeButton("取消", new DialogInterface.OnClickListener() {
				@Override
				public void onClick(DialogInterface dialog, int which) {
					// TODO Auto-generated method stub
				}
			})
			.setPositiveButton("登陆", new DialogInterface.OnClickListener() {
				@Override
				public void onClick(DialogInterface dialog, int which) {
					// TODO Auto-generated method stub
				}
			})
			.create();
		alertDialog.show();
	}
}

效果图：