private void attachAdapter() {
if (getHeight() == 0) {
// try again!
setAdapter(mAdapter);
return;
}
final int itemCount = mAdapter.getCount();
int itemGroup = mAdapter.getItemsCountPerGroup();
if (itemGroup < 3) {
itemGroup = 3;
}
final float height = getHeight();
final int itemHeight = (int) (height / itemGroup);
int additionHeight = (int) (height - itemHeight * itemGroup);
int itemPosition = 0;
final int totalItems = itemCount + 2;
for (int i = 0; i < totalItems; i++) {
if (i == 0 || i == totalItems - 1) {
TextView tv = (i == 0 ? mStartBlankView : mEndBlankView);
mItemLayoutParams.width = ViewGroup.LayoutParams.MATCH_PARENT;
mItemLayoutParams.height = (--additionHeight >= 0) ? itemHeight + 1 : itemHeight;
tv.setLayoutParams(mItemLayoutParams);
mItemsContainer.addView(tv);
} else {
View convertView = null;
boolean isCached = true;
if (itemPosition < mCachedSubViewList.size()) {
convertView = mCachedSubViewList.get(itemPosition);
} else {
isCached = false;
}
View view = mAdapter.getView(itemPosition, convertView, this);
view.setId(mAdapter.getItemId(itemPosition));
mItemLayoutParams.width = ViewGroup.LayoutParams.MATCH_PARENT;
mItemLayoutParams.height = (--additionHeight >= 0) ? itemHeight + 1 : itemHeight;
view.setLayoutParams(mItemLayoutParams);
mItemsContainer.addView(view);
if (!isCached) {
mCachedSubViewList.add(itemPosition, view);
} else {
if (view != convertView) {
mCachedSubViewList.remove(itemPosition);
mCachedSubViewList.add(itemPosition, view);
}
}
itemPosition++;
}
}
}
private void initItemViewsScrollYArr() {
if (mAdapter == null || mAdapter.getCount() < 1) {
return;
}
if (mItemViewsScrollYArr == null) {
int maxY = getMaxScrollY();
final int itemsCount = mAdapter.getCount();
mItemViewsScrollYArr = new int[itemsCount];
mItemViewsScrollYArr[0] = 0;
mItemViewsScrollYArr[itemsCount - 1] = maxY;
for (int i = 0; i < itemsCount - 2; i++) {
mItemViewsScrollYArr[i + 1] = (int) (1f * (i + 1) * maxY / (itemsCount - 1));
}
}
}
/**
* Sets the currently selected item.
*
* @param position
*/
public void setSelection(final int position) {
if (mAdapter == null || mAdapter.getCount() < 1) {
throw new NullPointerException("Currently no items!");
}
if (position < 0 || position >= mAdapter.getCount()) {
throw new IllegalArgumentException("Position out of index");
}
if (mContentScrollView.getHeight() == 0) {
mContentScrollView.postDelayed(
new Runnable() {
@Override
public void run() {
setNextSelectedPositionInt(position);
}
},
1);
} else {
setNextSelectedPositionInt(position);
}
}
private void setNextSelectedPositionInt(int position) {
if (mContentScrollView.getHeight() == 0) {
setSelection(position);
return;
}
mSelectedPosition = position;
initItemViewsScrollYArr();
mContentScrollView.scrollTo(
mContentScrollView.getScrollX(), mItemViewsScrollYArr[mSelectedPosition]);
if (mOnItemSelectedListener != null) {
mOnItemSelectedListener.onItemSelected(
this,
mCachedSubViewList.get(mSelectedPosition),
mSelectedPosition,
mAdapter.getItemId(mSelectedPosition));
}
}
/**
* Sets the data behind this VerticalScrollAutoSelector.
*
* @param adapter
*/
public void setAdapter(AutoSelectorAdapter adapter) {
mAdapter = adapter;
mSelectedPosition = -1;
mItemViewsScrollYArr = null;
mItemsContainer.removeAllViews();
if (mAdapter == null || mAdapter.getCount() <= 0) {
return;
}
if (getHeight() == 0) {
// Waiting for component initialization finished
postDelayed(
new Thread() {
@Override
public void run() {
attachAdapter();
}
},
1);
} else {
attachAdapter();
}
}
/**
* Get the selected item.
*
* @return
*/
public Object getSelectedItem() {
if (mAdapter == null || mSelectedPosition < 0) return null;
return mAdapter.getItem(mSelectedPosition);
}