HorizontalScrollView组合RadioGroup点击RadioButton时自动滑动到屏幕的中央

rg_room:为RadioGroup

hsv_top为：HorizontalScrollView

然后简单的计算一下HorizontalScrollView需要滑动的距离就可以了

//屏幕
Display d = getWindowManager().getDefaultDisplay();
DisplayMetrics dm = new DisplayMetrics(); d.getMetrics(dm);
final int screenHalf = d.getWidth()/2;//屏幕宽度的一半
//RadioGroup
rg_room.setOnCheckedChangeListener(new   RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
int scrollX = hsv_top.getScrollX();
RadioButton rb = (RadioButton) findViewById(checkedId);
int left = rb.getLeft();
int leftScreen = left-scrollX;
//HorizontalScrollView
hsv_top.smoothScrollBy((leftScreen-screenHalf), 0);
}
});

注意：如果RadioButton是动态添加的话,请在RadioGroup.addview()之后再rg_room.setOnCheckedChangeListener