Android: I am unable to have ViewPager WRAP_CONTENT

Overriding onMeasure of your ViewPager as follows will make it get the height of the biggest child it currently has.

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

    int height = 0;
    int childWidthSpec = MeasureSpec.makeMeasureSpec(
        Math.max(0, MeasureSpec.getSize(widthMeasureSpec) -
            getPaddingLeft() - getPaddingRight()),
        MeasureSpec.getMode(widthMeasureSpec)
    );
    for (int i = 0; i < getChildCount(); i++) {
        View child = getChildAt(i);
        child.measure(childWidthSpec, MeasureSpec.UNSPECIFIED);
        int h = child.getMeasuredHeight();
        if (h > height) height = h;
    }
    
    if (height != 0) {
        heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
    }

    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}