ViewGroup inside CollapsingToolbarLayout show extra bottom padding when set fitsSystemWindows to be true

Question

I am building an application and there is a profile fragment which shows a profile background image and some other elements. Like the screenshot below:

My quest

Answer 1

this problem maybe caused by this commit

I fixed it programmatically with the way comment by @Bogdan Zurac.

mCollapseContentLy = findViewById(R.id.ly_collapse_content);
mCollapseContentLy.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        int measuredHeight = mCollapseContentLy.getMeasuredHeight();
        ViewGroup.LayoutParams lp = mCollapsingToolbarLayout.getLayoutParams();
        layoutParams.height = measuredHeight;
        mCollapsingToolbarLayout.setLayoutParams(lp);
        mCollapseContentLy.getViewTreeObserver().removeGlobalOnLayoutListener(this);
    }
});

---

Edit after accepted

create a new class extend CollapsingToolbarLayout and override the onMeasure method

package android.support.design.widget;

import android.content.Context;
import android.util.AttributeSet;

public class GodCollapsingToolbarLayout extends CollapsingToolbarLayout {

    public GodCollapsingToolbarLayout(Context context) {
        this(context, null);
    }

    public GodCollapsingToolbarLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public GodCollapsingToolbarLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        final int mode = MeasureSpec.getMode(heightMeasureSpec);
        final int topInset = mLastInsets != null ? mLastInsets.getSystemWindowInsetTop() : 0;
        if (mode == MeasureSpec.UNSPECIFIED && topInset > 0) {
            // fix the bottom empty padding
            heightMeasureSpec = MeasureSpec.makeMeasureSpec(
                    getMeasuredHeight() - topInset, MeasureSpec.EXACTLY);
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }
}