How to set Animation For Linear Layout while Setting Visibility Visible and Gone

Question

What i am doing is Setting a ListView with custom Adapter and each item has a button and other components. on click of that button i want a Linear layout to be visible and and when again i click i want it to be Gone.

I am able to achieve it but what i want is to set animations for this Linear layout i.e when it's visibility is set to visible it must look like a drop down and when it is Gone it must go above and hide.

How could i do this, i have never used animations in android so can anyone help me with this

Here is what i am doing to set its visibility to be Visible and Gone

holder.readmoreBT.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            ViewHolder holder = (ViewHolder) v.getTag();
            ItemsAllPost itemToCount = holder.item;
            hitCountApi(holder);
            if (holder.contactsLV.getVisibility() == View.GONE) {
                holder.readmoreBT.setText("Read Less");
                holder.contactsLV.setVisibility(View.VISIBLE);
                if (itemToCount.user_email.equals("")
                        || itemToCount.user_email.equals("null")) {
                    holder.imageViewEmail.setVisibility(View.GONE);
                    holder.emailRL.setVisibility(View.GONE);
                }
                if (itemToCount.user_address.equals("")
                        || itemToCount.user_address.equals("null")) {
                    holder.imageViewAddress.setVisibility(View.GONE);
                    holder.addressRL.setVisibility(View.GONE);
                }
                if (itemToCount.user_ph_no.equals("")
                        || itemToCount.user_ph_no.equals("null")) {
                    holder.imageViewPhone.setVisibility(View.GONE);
                    holder.phoneRL.setVisibility(View.GONE);
                }
                holder.emailTV.setText(itemToCount.user_email);
                holder.phoneTV.setText(itemToCount.user_ph_no);
                holder.addressTV.setText(itemToCount.user_address);
                holder.postviewcountTV.setText(itemToCount.view_count);
            } else {
                holder.readmoreBT.setText("Read More");
                holder.postviewcountTV.setText(itemToCount.view_count);
                holder.contactsLV.setVisibility(View.GONE);
            }
        }
    });

any help would be greatly appreciated.

I have never used animations before so kindly answer me.

its contactsLV whose Animation i want to set