recyclerView设置最大高度

监听recyclerView的绘制完成之后，重新测量高度，如果高度超过最大高度的话，重新给recyclerView设置高度。如果是dialog的话，可以设置一下显示位置

recyclerView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        //设置最大高度
        recyclerView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
        int recyclerViewRealHeight = recyclerView.computeVerticalScrollRange();
        if (recyclerViewRealHeight > 800){
            LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) recyclerView.getLayoutParams();
            layoutParams.height = 800;
            recyclerView.setLayoutParams(layoutParams);
            
            Window window = getWindow();
            window.setGravity(Gravity.CENTER);
            WindowManager.LayoutParams lp = window.getAttributes();
            lp.gravity = Gravity.CENTER;
            window.setAttributes(lp);
        }
    }
});