Android11_Radio和CheckBox
程序员文章站
2022-05-31 18:49:38
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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:
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