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

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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