Example usage for android.widget ListAdapter getCount

Introduction

In this page you can find the example usage for android.widget ListAdapter getCount.

Prototype

int getCount();

Source Link

Document

How many items are in the data set represented by this Adapter.

Usage

From source file:com.artifex.mupdflib.TwoWayView.java

@Override
protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
    super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);

    if (gainFocus && mSelectedPosition < 0 && !isInTouchMode()) {
        if (!mIsAttached && mAdapter != null) {
            // Data may have changed while we were detached and it's valid
            // to change focus while detached. Refresh so we don't die.
            mDataChanged = true;//from w  ww  .j  a  v a2s  .  c  o m
            mOldItemCount = mItemCount;
            mItemCount = mAdapter.getCount();
        }

        resurrectSelection();
    }

    final ListAdapter adapter = mAdapter;
    int closetChildIndex = INVALID_POSITION;
    int closestChildStart = 0;

    if (adapter != null && gainFocus && previouslyFocusedRect != null) {
        previouslyFocusedRect.offset(getScrollX(), getScrollY());

        // Don't cache the result of getChildCount or mFirstPosition here,
        // it could change in layoutChildren.
        if (adapter.getCount() < getChildCount() + mFirstPosition) {
            mLayoutMode = LAYOUT_NORMAL;
            layoutChildren();
        }

        // Figure out which item should be selected based on previously
        // focused rect.
        Rect otherRect = mTempRect;
        int minDistance = Integer.MAX_VALUE;
        final int childCount = getChildCount();
        final int firstPosition = mFirstPosition;

        for (int i = 0; i < childCount; i++) {
            // Only consider selectable views
            if (!adapter.isEnabled(firstPosition + i)) {
                continue;
            }

            View other = getChildAt(i);
            other.getDrawingRect(otherRect);
            offsetDescendantRectToMyCoords(other, otherRect);
            int distance = getDistance(previouslyFocusedRect, otherRect, direction);

            if (distance < minDistance) {
                minDistance = distance;
                closetChildIndex = i;
                closestChildStart = getChildStartEdge(other);
            }
        }
    }

    if (closetChildIndex >= 0) {
        setSelectionFromOffset(closetChildIndex + mFirstPosition, closestChildStart);
    } else {
        requestLayout();
    }
}

From source file:com.artifex.mupdflib.TwoWayView.java

/**
 * Measures the width of the given range of children (inclusive) and
 * returns the width with this TwoWayView's padding and item margin widths
 * included. If maxWidth is provided, the measuring will stop when the
 * current width reaches maxWidth./*ww  w  . j a  v a2s.  c  o m*/
 *
 * @param heightMeasureSpec The height measure spec to be given to a child's
 *            {@link View#measure(int, int)}.
 * @param startPosition The position of the first child to be shown.
 * @param endPosition The (inclusive) position of the last child to be
 *            shown. Specify {@link #NO_POSITION} if the last child should be
 *            the last available child from the adapter.
 * @param maxWidth The maximum width that will be returned (if all the
 *            children don't fit in this value, this value will be
 *            returned).
 * @param disallowPartialChildPosition In general, whether the returned
 *            width should only contain entire children. This is more
 *            powerful--it is the first inclusive position at which partial
 *            children will not be allowed. Example: it looks nice to have
 *            at least 3 completely visible children, and in portrait this
 *            will most likely fit; but in landscape there could be times
 *            when even 2 children can not be completely shown, so a value
 *            of 2 (remember, inclusive) would be good (assuming
 *            startPosition is 0).
 * @return The width of this TwoWayView with the given children.
 */
private int measureWidthOfChildren(int heightMeasureSpec, int startPosition, int endPosition,
        final int maxWidth, int disallowPartialChildPosition) {

    final int paddingLeft = getPaddingLeft();
    final int paddingRight = getPaddingRight();

    final ListAdapter adapter = mAdapter;
    if (adapter == null) {
        return paddingLeft + paddingRight;
    }

    // Include the padding of the list
    int returnedWidth = paddingLeft + paddingRight;
    final int itemMargin = mItemMargin;

    // The previous height value that was less than maxHeight and contained
    // no partial children
    int prevWidthWithoutPartialChild = 0;
    int i;
    View child;

    // mItemCount - 1 since endPosition parameter is inclusive
    endPosition = (endPosition == NO_POSITION) ? adapter.getCount() - 1 : endPosition;
    final RecycleBin recycleBin = mRecycler;
    final boolean shouldRecycle = recycleOnMeasure();
    final boolean[] isScrap = mIsScrap;

    for (i = startPosition; i <= endPosition; ++i) {
        child = obtainView(i, isScrap);

        measureScrapChild(child, i, heightMeasureSpec);

        if (i > 0) {
            // Count the item margin for all but one child
            returnedWidth += itemMargin;
        }

        // Recycle the view before we possibly return from the method
        if (shouldRecycle) {
            recycleBin.addScrapView(child, -1);
        }

        returnedWidth += child.getMeasuredWidth();

        if (returnedWidth >= maxWidth) {
            // We went over, figure out which width to return.  If returnedWidth > maxWidth,
            // then the i'th position did not fit completely.
            return (disallowPartialChildPosition >= 0) // Disallowing is enabled (> -1)
                    && (i > disallowPartialChildPosition) // We've past the min pos
                    && (prevWidthWithoutPartialChild > 0) // We have a prev width
                    && (returnedWidth != maxWidth) // i'th child did not fit completely
                            ? prevWidthWithoutPartialChild
                            : maxWidth;
        }

        if ((disallowPartialChildPosition >= 0) && (i >= disallowPartialChildPosition)) {
            prevWidthWithoutPartialChild = returnedWidth;
        }
    }

    // At this point, we went through the range of children, and they each
    // completely fit, so return the returnedWidth
    return returnedWidth;
}

From source file:com.artifex.mupdflib.TwoWayView.java

@Override
public void setAdapter(ListAdapter adapter) {
    if (mAdapter != null && mDataSetObserver != null) {
        mAdapter.unregisterDataSetObserver(mDataSetObserver);
    }//from  www  .  ja  va2  s  .c o m

    resetState();
    mRecycler.clear();

    mAdapter = adapter;
    mDataChanged = true;

    mOldSelectedPosition = INVALID_POSITION;
    mOldSelectedRowId = INVALID_ROW_ID;

    if (mCheckStates != null) {
        mCheckStates.clear();
    }

    if (mCheckedIdStates != null) {
        mCheckedIdStates.clear();
    }

    if (mAdapter != null) {
        mOldItemCount = mItemCount;
        mItemCount = adapter.getCount();

        mDataSetObserver = new AdapterDataSetObserver();
        mAdapter.registerDataSetObserver(mDataSetObserver);

        mRecycler.setViewTypeCount(adapter.getViewTypeCount());

        mHasStableIds = adapter.hasStableIds();
        mAreAllItemsSelectable = adapter.areAllItemsEnabled();

        if (mChoiceMode != ChoiceMode.NONE && mHasStableIds && mCheckedIdStates == null) {
            mCheckedIdStates = new LongSparseArray<Integer>();
        }

        final int position = lookForSelectablePosition(0);
        setSelectedPositionInt(position);
        setNextSelectedPositionInt(position);

        if (mItemCount == 0) {
            checkSelectionChanged();
        }
    } else {
        mItemCount = 0;
        mHasStableIds = false;
        mAreAllItemsSelectable = true;

        checkSelectionChanged();
    }

    checkFocus();
    requestLayout();
}