Android11_Radio和CheckBox

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

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<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>

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?CtrlActivity.java

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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

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

?CtrlActivity.java

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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。

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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。

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四、完整代码

main.xml

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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"    ><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

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<?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

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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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