Android(安卓)RadioButton 单选按钮

RadioGroup 单选按钮组，可以包含多个单选按钮，当单选按钮选中状态改变时会触发setOnCheckedChangeListener

package shortcut.song.com.myapplication;import android.graphics.Color;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.RadioGroup;import android.widget.RelativeLayout;public class RadioButtonActivity extends AppCompatActivity {    RadioGroup mRadioGroup;    RelativeLayout mRelativeLayout;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_radio_button);        mRadioGroup = (RadioGroup)findViewById(R.id.radiogroup1);        mRelativeLayout = (RelativeLayout)findViewById(R.id.activity_radio_button);

        mRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(RadioGroup group, int checkedId) {                switch(checkedId)                {                    case R.id.radio1:                        mRelativeLayout.setBackgroundColor(Color.RED);                        break;                    case R.id.radio2:                        mRelativeLayout.setBackgroundColor(Color.GREEN);                        break;                    case R.id.radio3:                        mRelativeLayout.setBackgroundColor(Color.BLUE);                        break;                }            }        });    }}

layout布局，包含了一个RadioGroup，和三个RadioButton

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_radio_button"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="shortcut.song.com.myapplication.RadioButtonActivity">    <RadioGroup        android:id="@+id/radiogroup1"        android:layout_width="match_parent"        android:layout_height="match_parent">        <RadioButton            android:id="@+id/radio1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="红色"            />        <RadioButton           android:id="@+id/radio2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="绿色"            />        <RadioButton            android:id="@+id/radio3"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="蓝色"            />    RadioGroup>RelativeLayout>

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