Example usage for android.widget ListAdapter getItemId

Introduction

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

Prototype

long getItemId(int position);

Source Link

Document

Get the row id associated with the specified position in the list.

Usage

From source file:com.aliasapps.seq.scroller.TwoWayView.java

private int findSyncPosition() {
    int itemCount = mItemCount;

    if (itemCount == 0) {
        return INVALID_POSITION;
    }//ww  w.j av a 2  s . co  m

    final long idToMatch = mSyncRowId;

    // If there isn't a selection don't hunt for it
    if (idToMatch == INVALID_ROW_ID) {
        return INVALID_POSITION;
    }

    // Pin seed to reasonable values
    int seed = mSyncPosition;
    seed = Math.max(0, seed);
    seed = Math.min(itemCount - 1, seed);

    long endTime = SystemClock.uptimeMillis() + SYNC_MAX_DURATION_MILLIS;

    long rowId;

    // first position scanned so far
    int first = seed;

    // last position scanned so far
    int last = seed;

    // True if we should move down on the next iteration
    boolean next = false;

    // True when we have looked at the first item in the data
    boolean hitFirst;

    // True when we have looked at the last item in the data
    boolean hitLast;

    // Get the item ID locally (instead of getItemIdAtPosition), so
    // we need the adapter
    final ListAdapter adapter = mAdapter;
    if (adapter == null) {
        return INVALID_POSITION;
    }

    while (SystemClock.uptimeMillis() <= endTime) {
        rowId = adapter.getItemId(seed);
        if (rowId == idToMatch) {
            // Found it!
            return seed;
        }

        hitLast = (last == itemCount - 1);
        hitFirst = (first == 0);

        if (hitLast && hitFirst) {
            // Looked at everything
            break;
        }

        if (hitFirst || (next && !hitLast)) {
            // Either we hit the top, or we are trying to move down
            last++;
            seed = last;

            // Try going up next time
            next = false;
        } else if (hitLast || (!next && !hitFirst)) {
            // Either we hit the bottom, or we are trying to move up
            first--;
            seed = first;

            // Try going down next time
            next = true;
        }
    }

    return INVALID_POSITION;
}

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From source file:com.artifex.mupdf.view.ThumbnailViews.java

private void rememberSyncState() {
    if (getChildCount() == 0) {
        return;/*w w w  .j av  a2s.c  o  m*/
    }

    mNeedSync = true;

    if (mSelectedPosition >= 0) {
        View child = getChildAt(mSelectedPosition - mFirstPosition);

        mSyncRowId = mNextSelectedRowId;
        mSyncPosition = mNextSelectedPosition;

        if (child != null) {
            mSpecificStart = (mIsVertical ? child.getTop() : child.getLeft());
        }

        mSyncMode = SYNC_SELECTED_POSITION;
    } else {
        // Sync the based on the offset of the first view
        View child = getChildAt(0);
        ListAdapter adapter = getAdapter();

        if (mFirstPosition >= 0 && mFirstPosition < adapter.getCount()) {
            mSyncRowId = adapter.getItemId(mFirstPosition);
        } else {
            mSyncRowId = NO_ID;
        }

        mSyncPosition = mFirstPosition;

        if (child != null) {
            mSpecificStart = child.getTop();
        }

        mSyncMode = SYNC_FIRST_POSITION;
    }
}

---

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

private void rememberSyncState() {
    if (getChildCount() == 0) {
        return;//w  ww . j  a v  a 2  s  .  c o m
    }

    mNeedSync = true;

    if (mSelectedPosition >= 0) {
        View child = getChildAt(mSelectedPosition - mFirstPosition);

        mSyncRowId = mNextSelectedRowId;
        mSyncPosition = mNextSelectedPosition;

        if (child != null) {
            mSpecificStart = getChildStartEdge(child);
        }

        mSyncMode = SYNC_SELECTED_POSITION;
    } else {
        // Sync the based on the offset of the first view
        View child = getChildAt(0);
        ListAdapter adapter = getAdapter();

        if (mFirstPosition >= 0 && mFirstPosition < adapter.getCount()) {
            mSyncRowId = adapter.getItemId(mFirstPosition);
        } else {
            mSyncRowId = NO_ID;
        }

        mSyncPosition = mFirstPosition;

        if (child != null) {
            mSpecificStart = getChildStartEdge(child);
        }

        mSyncMode = SYNC_FIRST_POSITION;
    }
}

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