自定义TabView

public class TabView extends LinearLayout {
    private TabModel tabModel;
    private AppCompatImageView imageView;

    private final int imgSizeNormal = ConvertUtils.dp2px(24);
    private final float textSizeNormal = ConvertUtils.sp2px(6);

    private final int imgSizeBig = ConvertUtils.dp2px(26);
    private final float textSizeBig = ConvertUtils.sp2px(8);

    private TextView textView;

    public TabView(Context context, TabModel tabModel) {
        super(context);
        this.tabModel = tabModel;
        setOrientation(LinearLayout.VERTICAL);
        setGravity(Gravity.CENTER);
        //摆放布局
        layoutView();
    }

    private void layoutView() {
        imageView = new AppCompatImageView(getContext());
        imageView.setLayoutParams(new LinearLayout.LayoutParams(imgSizeNormal, imgSizeNormal));
        imageView.setImageDrawable(ResourceUtils.getDrawable(tabModel.getIcon()));
        imageView.setScaleType(ImageView.ScaleType.FIT_XY);

        textView = new TextView(getContext());
        LayoutParams params = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        textView.setLayoutParams(params);
        textView.setText(tabModel.getTitle());
        textView.setTextSize(textSizeNormal);
        textView.setTextColor(ColorUtils.getColor(R.color.text_color_light));

        addView(imageView);
        addView(textView);
    }

    public void setBig() {
        ViewGroup.LayoutParams layoutParams = imageView.getLayoutParams();
        layoutParams.width = imgSizeBig;
        layoutParams.height = imgSizeBig;
        textView.setTextSize(textSizeBig);
        imageView.setLayoutParams(layoutParams);
    }

    public void setNormal() {
        ViewGroup.LayoutParams layoutParams = imageView.getLayoutParams();
        layoutParams.width = imgSizeNormal;
        layoutParams.height = imgSizeNormal;
        textView.setTextSize(textSizeNormal);
        imageView.setLayoutParams(layoutParams);
    }
}

fragment监听选中状态

tab.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                TabView tabView = (TabView) tab.getCustomView();
                tabView.setBig();
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
                TabView tabView = (TabView) tab.getCustomView();
                tabView.setNormal();
            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {

            }
        });

问题在于效果有，但是布局会出现变形。底部的tab会被顶高。
正常状态:

点击后:

可以看到布局出现了问题，请老师指点一下问题所在。谢谢