<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- 未選中->
<item
android:state_checked="false"
android:drawable="@drawable/tabswitcher_long" />
<!--選中->
<item
android:state_checked="true"
android:drawable="@drawable/tabswitcher_short" />
</selector>

<RadioGroup
...
>
<RadioButton
...
android:button="@null"
android:background="@drawable/radio"
/>
</RadioGroup>

@Override
public boolean onTouchEvent(MotionEvent event) {
if(event.getActionMasked() == MotionEvent.ACTION_DOWN){
this.setBackgroundResource(com.wxg.tab.R.drawable.main_bg);
}else if(event.getActionMasked()== MotionEvent.ACTION_DOWN) {
this.setBackgroundResource(com.wxg.tab.R.drawable.hui);
}
return super.onTouchEvent(event);
}