Expert - CustomView group to get high performance

CustomViewGroup

public class ProfilePhotoLayout extends ViewGroup {
 
    private ProfilePhoto mProfilePhoto;
    private Menu mMenu;
    private Title mTitle;
    private Subtitle mSubtitle;
 
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        // 1. Setup initial constraints.
        int widthConstraints = getPaddingLeft() + getPaddingRight();
        int heightContraints = getPaddingTop() + getPaddingBottom();
        int width = 0;
        int height = 0;
 
        // 2. Measure the ProfilePhoto
        measureChildWithMargins(
            mProfilePhoto,
            widthMeasureSpec,
            widthConstraints,
            heightMeasureSpec,
            heightConstraints);
 
        // 3. Update the contraints.
        widthConstraints += mProfilePhoto.getMeasuredWidth();
        width += mProfilePhoto.getMeasuredWidth();
        height = Math.max(mProfilePhoto.getMeasuredHeight(), height);
 
        // 4. Measure the Menu.
        measureChildWithMargins(
            mMenu,
            widthMeasureSpec,
            widthConstraints,
            heightMeasureSpec,
            heightConstraints);
 
        // 5. Update the constraints.
        widthConstraints += mMenu.getMeasuredWidth();
        width += mMenu.getMeasuredWidth();
        height = Math.max(mMenu.getMeasuredHeight(), height);
 
        // 6. Prepare the vertical MeasureSpec.
        int verticalWidthMeasureSpec = MeasureSpec.makeMeasureSpec(
            MeasureSpec.getSize(widthMeasureSpec) - widthConstraints,
            MeasureSpec.getMode(widthMeasureSpec));
 
        int verticalHeightMeasureSpec = MeasureSpec.makeMeasureSpec(
            MeasureSpec.getSize(heightMeasureSpec) - heightConstraints,
            MeasureSpec.getMode(heightMeasureSpec));
 
        // 7. Measure the Title.
        measureChildWithMargins(
            mTitle,
            verticalWidthMeasureSpec,
            0,
            verticalHeightMeasureSpec,
            0);
 
        // 8. Measure the Subtitle.
        measureChildWithMargins(
            mSubtitle,
            verticalWidthMeasureSpec,
            0,
            verticalHeightMeasureSpec,
            mTitle.getMeasuredHeight());
 
        // 9. Update the sizes.
        width += Math.max(mTitle.getMeasuredWidth(), mSubtitle.getMeasuredWidth());
        height = Math.max(mTitle.getMeasuredHeight() + mSubtitle.getMeasuredHeight(), height);
 
        // 10. Set the dimension for this ViewGroup.
        setMeasuredDimension(
            resolveSize(width, widthMeasureSpec),
            resolveSize(height, heightMeasureSpec));
    }
 
    @Override
    protected void measureChildWithMargins(
        View child,
        int parentWidthMeasureSpec,
        int widthUsed,
        int parentHeightMeasureSpec,
        int heightUsed) {
        MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
 
        int childWidthMeasureSpec = getChildMeasureSpec(
            parentWidthMeasureSpec,
            widthUsed + lp.leftMargin + lp.rightMargin,
            lp.width);
 
        int childHeightMeasureSpec = getChildMeasureSpec(
            parentHeightMeasureSpec,
            heightUsed + lp.topMargin + lp.bottomMargin,
            lp.height);
 
        child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
    }
}