请帮我解决这些问题，我被困住了
我正在使用 viewpager，我需要我的线性布局更改它在单击按钮时的可见性，但可见性属性似乎但不起作用。
这是我的代码
public class MyPagerAdapter extends PagerAdapter {
@Override
public Object instantiateItem(final View collection, final int position) {
Log.d("Inside", "Pager");
PagerView = new View(collection.getContext());
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
PagerView = inflater.inflate(R.layout.bigimage, null);
imgSubmenu = (ScalableImageView)PagerView.findViewById(R.id.imgSubMenu);
btnBack = (Button)PagerView.findViewById(R.id.btnBack);
btnCart = (Button) PagerView.findViewById(R.id.btnCart);
btnCallWaiter = (Button) PagerView.findViewById(R.id.btnCallWaiter);
btnPayBill = (Button) PagerView.findViewById(R.id.btnPayBill);
btnReadMore = (Button) PagerView.findViewById(R.id.btnReadMore);
btnAddtoOrder = (Button) PagerView.findViewById(R.id.btnAddtoOrder);
tvSubMenuName = (TextView) PagerView.findViewById(R.id.tvSubMenuName);
tvDescption = (TextView) PagerView.findViewById(R.id.tvDescrption);
readLayout=(LinearLayout)PagerView.findViewById(R.id.readLayout);
font = Typeface.createFromAsset(MenuSelectionActivity.this.getAssets(),
"fonts/BEBAS___.ttf");
btnBack.setTypeface(font, Typeface.BOLD);
btnCallWaiter.setTypeface(font, Typeface.BOLD);
btnPayBill.setTypeface(font, Typeface.BOLD);
btnReadMore.setTypeface(font, Typeface.BOLD);
tvSubMenuName.setTypeface(font, Typeface.BOLD);
btnReadMore.setTypeface(font, Typeface.BOLD);
tvDescption.setTypeface(font, Typeface.BOLD);
btnAddtoOrder.setTypeface(font, Typeface.BOLD);
((ViewPager) collection).addView(PagerView, 0);
DisplayItem(position);
btnReadMore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.d("readtype",""+readtype);
if(readtype==0)
{
readLayout.setVisibility(View.GONE);
btnReadMore.setText("READ MORE");
btnReadMore.setBackgroundResource(drawable.readmore);
readtype=1;
}
else
{
readLayout.setVisibility(View.VISIBLE);
btnReadMore.setText("READ LESS");
btnReadMore.setBackgroundResource(drawable.readless);
readtype=0;
}
}
});
btnBack.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
}
});
return PagerView;
}
@Override
public void destroyItem(final View arg0, final int arg1,
final Object arg2) {
((ViewPager) arg0).removeView((View) arg2);
}
@Override
public boolean isViewFromObject(final View arg0, final Object arg1) {
return arg0 == ((View) arg1);
}
@Override
public void finishUpdate(View arg0) {
// TODO Auto-generated method stub
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
// TODO Auto-generated method stub
}
@Override
public Parcelable saveState() {
// TODO Auto-generated method stub
return null;
}
@Override
public void startUpdate(View arg0) {
// TODO Auto-generated method stub
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return SubMenuIdList.size();
}
}
谁能帮帮我。