Android11_Radio和CheckBox

最新推荐文章于 2022-11-02 14:42:57 发布

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#Android #RadioGroup #RadioButton #CheckBox #Toast

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本文详细介绍了Android中单选按钮（RadioGroup和RadioButton）及多选按钮（CheckBox）的使用方法，包括它们的布局文件（main.xml）、代码实现（CtrlActivity.java）以及Toast提示信息的运用。此外，还展示了如何在应用程序中实现选择功能，如性别选择和兴趣选择，并通过Toast进行反馈。

一、RadioGroup和RadioButton的使用方法

RadioGroup和RadioButton代表的是Android中单选按钮的一种控件。对于单选按钮来说，每次只能选一个，如果有多组需要单选的信息，如：男、女，匿名发表、实名发表等，此时则需要组来区分哪几个单选按钮时一组的。

main.xml

<RadioGroup 
    	android:id="@+id/radioGroup"
    	android:layout_width="wrap_content" 
    	android:layout_height="wrap_content" 
    	android:orientation="vertical"
    >
    	<RadioButton 
    		android:id="@+id/male"
    		android:layout_width="wrap_content" 
    		android:layout_height="wrap_content" 
    		android:text="@string/male"
    	/>
    	<RadioButton 
    		android:id="@+id/female"
    		android:layout_width="wrap_content" 
    		android:layout_height="wrap_content" 
    		android:text="@string/female"
    	/>
</RadioGroup>

CtrlActivity.java

radioGroup = (RadioGroup)findViewById(R.id.radioGroup);
male = (RadioButton)findViewById(R.id.male);
female = (RadioButton)findViewById(R.id.female);
//给radioGroup添加监听器
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
	public void onCheckedChanged(RadioGroup group, int checkedId) {
		if(female.getId() == checkedId){
			System.out.println("famale");
			//使用toast提示信息
			Toast.makeText(CtrlActivity.this, "您选择了女！", Toast.LENGTH_SHORT).show();
		}
		else if(male.getId() == checkedId){
			System.out.println("male");
			Toast.makeText(CtrlActivity.this, "您选择了男！", Toast.LENGTH_SHORT).show();
		}
	}
});

二、CheckBox的使用方法

main.xml

<CheckBox 
    	android:id="@+id/football"
    	android:layout_width="wrap_content" 
    	android:layout_height="wrap_content" 
    	android:text="@string/football"
/>

CtrlActivity.java

football = (CheckBox)findViewById(R.id.football);
//为多选按钮添加监听器
football.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
	public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
		if(isChecked){
			System.out.println("football is checked");
			Toast.makeText(CtrlActivity.this, "您选择了足球！", Toast.LENGTH_SHORT).show();
		}
		else{
			System.out.println("football is unchecked");
			Toast.makeText(CtrlActivity.this, "您取消了足球选择！", Toast.LENGTH_SHORT).show();
		}
	}
});

三、Toast的基本用法

用于设置提示信息，用起来很方便。只需要一行代码。

Toast.makeText(CtrlActivity.this, "选择成功！", Toast.LENGTH_SHORT).show();

其中makeText方法有三个参数，分别为当前Activity对象，输出数据以及Toast的长度。

四、完整代码

main.xml

<?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"
    >
	<TextView  
	    android:layout_width="fill_parent" 
	    android:layout_height="wrap_content" 
	    android:text="@string/app_name"
    />
    <TextView 
    	android:layout_width="fill_parent"
    	android:layout_height="wrap_content"
    	android:text="@string/radioText"
    />
    <RadioGroup 
    	android:id="@+id/radioGroup"
    	android:layout_width="wrap_content" 
    	android:layout_height="wrap_content" 
    	android:orientation="vertical"
    >
    	<RadioButton 
    		android:id="@+id/male"
    		android:layout_width="wrap_content" 
    		android:layout_height="wrap_content" 
    		android:text="@string/male"
    	/>
    	<RadioButton 
    		android:id="@+id/female"
    		android:layout_width="wrap_content" 
    		android:layout_height="wrap_content" 
    		android:text="@string/female"
    	/>
    </RadioGroup>
    <CheckBox 
    	android:id="@+id/football"
    	android:layout_width="wrap_content" 
    	android:layout_height="wrap_content" 
    	android:text="@string/football"
    />
    <CheckBox 
    	android:id="@+id/basketball"
    	android:layout_width="wrap_content" 
    	android:layout_height="wrap_content" 
    	android:text="@string/basketball"
    />
    <CheckBox 
    	android:id="@+id/volleyball"
    	android:layout_width="wrap_content" 
    	android:layout_height="wrap_content" 
    	android:text="@string/volleyball"
    />
    
</LinearLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, CtrlActivity!</string>
    <string name="app_name">测试选择控件</string>
    <string name="radioText">下面是单选框控件</string>
    <string name="male">男</string>
    <string name="female">女</string>
    <string name="football">足球</string>
    <string name="basketball">篮球</string>
    <string name="volleyball">排球</string>
</resources>

CtrlActivity.java

package com.android.activity;

import android.app.Activity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class CtrlActivity extends Activity {
	
	private RadioGroup radioGroup = null;
	private RadioButton male = null;
	private RadioButton female = null;
	
	private CheckBox football = null;
	private CheckBox basketball = null;
	private CheckBox volleyball = null;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        radioGroup = (RadioGroup)findViewById(R.id.radioGroup);
        male = (RadioButton)findViewById(R.id.male);
        female = (RadioButton)findViewById(R.id.female);
        
        football = (CheckBox)findViewById(R.id.football);
        basketball = (CheckBox)findViewById(R.id.basketball);
        volleyball = (CheckBox)findViewById(R.id.volleyball);
        
        //为RadioGroup设置监听器，需要注意的是，这里的监听器和Button控件的监听器有所不同
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
		public void onCheckedChanged(RadioGroup group, int checkedId) {
			if(female.getId() == checkedId){
				System.out.println("famale");
				//使用toast提示信息
				Toast.makeText(CtrlActivity.this, "您选择了女！", Toast.LENGTH_SHORT).show();
			}
			else if(male.getId() == checkedId){
				System.out.println("male");
				Toast.makeText(CtrlActivity.this, "您选择了男！", Toast.LENGTH_SHORT).show();
			}
		}
	});
        
        //为多选按钮添加监听器
        football.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
		public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
			if(isChecked){
				System.out.println("football is checked");
				Toast.makeText(CtrlActivity.this, "您选择了足球！", Toast.LENGTH_SHORT).show();
			}
			else{
				System.out.println("football is unchecked");
				Toast.makeText(CtrlActivity.this, "取消足球选择！", Toast.LENGTH_SHORT).show();
			}
		}
	});
        
        basketball.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
		public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
			if(isChecked){
				System.out.println("basketball is checked");
				Toast.makeText(CtrlActivity.this, "您选择了篮球！", Toast.LENGTH_SHORT).show();
			}
			else{
				System.out.println("basketball is unchecked");
				Toast.makeText(CtrlActivity.this, "取消篮球选择！", Toast.LENGTH_SHORT).show();
			}
		}
	});
        
        volleyball.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
		public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
			if(isChecked){
				System.out.println("volleyball is checked");
				Toast.makeText(CtrlActivity.this, "您选择了排球！", Toast.LENGTH_SHORT).show();
			}
			else{
				System.out.println("volleyball is unchecked");
				Toast.makeText(CtrlActivity.this, "取消排球选择！", Toast.LENGTH_SHORT).show();
			}
		}
	});
    }
}

运行结果：