Example usage for android.widget ListAdapter hasStableIds

Introduction

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

Prototype

boolean hasStableIds();

Source Link

Document

Indicates whether the item ids are stable across changes to the underlying data.

Usage

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

@Override
public void setAdapter(ListAdapter adapter) {
    if (mAdapter != null && mDataSetObserver != null) {
        mAdapter.unregisterDataSetObserver(mDataSetObserver);
    }/*from   ww w .java  2 s  . c  om*/

    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();
}

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