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copied!<p>I'd say your best bet would be to create an anon inner class from this class and add your timer logic in an extension of <code>GridView</code>: </p> <pre><code>class AdapterDataSetObserver extends DataSetObserver { @Override public void onChanged() { } @Override public void onInvalidated() { } } </code></pre> <p>(You can access this member variable as it is not priveate): </p> <pre><code>/** * Should be used by subclasses to listen to changes in the dataset */ AdapterDataSetObserver mDataSetObserver; </code></pre> <p>This is the method that you should override (inside gridview) (You may need to make some modifications as some of these member variables may be private - <code>mDataSetObserver</code> is not, however: </p> <pre><code>@Override public void setAdapter(ListAdapter adapter) { if (null != mAdapter) { mAdapter.unregisterDataSetObserver(mDataSetObserver); } resetList(); mRecycler.clear(); mAdapter = adapter; mOldSelectedPosition = INVALID_POSITION; mOldSelectedRowId = INVALID_ROW_ID; if (mAdapter != null) { mOldItemCount = mItemCount; mItemCount = mAdapter.getCount(); mDataChanged = true; checkFocus(); mDataSetObserver = new AdapterDataSetObserver(); mAdapter.registerDataSetObserver(mDataSetObserver); mRecycler.setViewTypeCount(mAdapter.getViewTypeCount()); int position; if (mStackFromBottom) { position = lookForSelectablePosition(mItemCount - 1, false); } else { position = lookForSelectablePosition(0, true); } setSelectedPositionInt(position); setNextSelectedPositionInt(position); checkSelectionChanged(); } else { checkFocus(); // Nothing selected checkSelectionChanged(); } requestLayout(); } </code></pre> <p>Look for these two lines in the method above and extend your class here: </p> <pre><code> mDataSetObserver = new AdapterDataSetObserver(); mAdapter.registerDataSetObserver(mDataSetObserver); </code></pre>

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