一、應(yīng)用場(chǎng)景：

在使用 RadioButton 時(shí)，有時(shí)我們會(huì)需要自定義點(diǎn)擊時(shí)改變背景顏色的效果。

效果圖：

RadioButton自定義背景顏色.jpg

二秦驯、實(shí)現(xiàn)步驟：

1、新建一組 RadioButton ：

<RadioGroup  
    android:layout_width="match_parent"  
    android:layout_height="wrap_content"  
    android:gravity="center"  
    android:orientation="horizontal">  
  
    <RadioButton  
        android:id="@+id/btn1"  
        android:layout_width="0dp"  
        android:layout_height="35dp"  
        android:layout_weight="1"  
        android:background="@drawable/radiobutton_background"  
        android:button="@null"  
        android:gravity="center"  
        android:text="P0501"  
        android:textColor="@color/radiobutton_textcolor"  
        android:textSize="14sp" />  
  
    <RadioButton  
        android:id="@+id/btn2"  
        android:layout_width="0dp"  
        android:layout_height="35dp"  
        android:layout_marginStart="10dp"  
        android:layout_weight="1"  
        android:background="@drawable/radiobutton_background"  
        android:button="@null"  
        android:gravity="center"  
        android:text="P0502"  
        android:textColor="@color/radiobutton_textcolor"  
        android:textSize="14sp" />  
  
    <RadioButton  
        android:id="@+id/btn3"  
        android:layout_width="0dp"  
        android:layout_height="35dp"  
        android:layout_marginStart="10dp"  
        android:layout_weight="1"  
        android:background="@drawable/radiobutton_background"  
        android:button="@null"  
        android:gravity="center"  
        android:text="P0503"  
        android:textColor="@color/radiobutton_textcolor"  
        android:textSize="14sp" />  
  
</RadioGroup>  

注意：這里有2個(gè)關(guān)鍵屬性挣棕，說(shuō)明一下
1）译隘、android:button="@null" 這樣設(shè)置可以不顯示我們通常所見(jiàn)的 RadioButton 中的圓形選中按鈕.
2）亲桥、android:background="@drawable/radiobutton_background" 這里設(shè)置了背景選擇器。

2固耘、radiobutton_background.xml

<selector xmlns:android="http://schemas.android.com/apk/res/android">  
    <item android:drawable="@drawable/radiobutton_background_unchecked"  
        android:state_checked="false" />  
    <item android:drawable="@drawable/radiobutton_background_checked"  
        android:state_checked="true" />  
</selector>  

3题篷、radiobutton_background_checked.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android"  
    android:shape="rectangle">  
    <!-- 填充 -->  
    <solid android:color="@color/color1" />  
    <!-- 圓角 -->  
    <corners android:radius="5dp" />  
</shape>  

4、radiobutton_background_unchecked.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android"  
    android:shape="rectangle">  
    <!-- 填充 -->  
    <solid android:color="@color/color2" />  
    <!-- 圓角 -->  
    <corners android:radius="5dp" />  
</shape>  

5厅目、RadioGroup 的單選監(jiān)聽(tīng)器番枚，獲取選中的RadioButton

RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radioGroup);  
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {  
    @Override  
    public void onCheckedChanged(RadioGroup group, int checkedId) {  
        RadioButton radioButton = (RadioButton) group.findViewById(checkedId);  
        String result = radioButton.getText().toString();  
    }  
});