Databases
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Postsdbo
PO
 

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    <p>Per <a href="http://developer.android.com/reference/android/widget/AbsListView.html#setFastScrollEnabled%28boolean%29" rel="nofollow">ListView.setFastScrollEnabled</a>, you need to enable fast scrolling and ensure that your adapter implements <a href="http://developer.android.com/reference/android/widget/SectionIndexer.html" rel="nofollow">SectionIndexer</a> (which translates positions to sections). A helper class, <a href="http://developer.android.com/reference/android/widget/AlphabetIndexer.html" rel="nofollow">AlphabetIndexer</a> can be used if your adapter is backed by a <code>Cursor</code> such as:</p> <pre><code>public class MyAdapter extends CursorAdapter implements SectionIndexer { // All valid characters. May want to include numbers, etc if they show up // in your sort column private final static String ALPHABET = "abcdefghijklmnopqrstuvwxyz"; private AlphabetIndexer mIndexer = null; public MyAdapter(Context context, Cursor c, int flags) { super(context, c, flags); // Assumes your cursor is non-null, // otherwise do this in swapCursor if mIndexer==null final int sortColumnIndex = c.getColumnIndex(YOUR_SORT_COLUMN_NAME); mIndexer = new AlphabetIndexer(c, sortColumnIndex, ALPHABET); } public Cursor swapCursor(Cursor newCursor) { super.swapCursor(newCursor); // Make sure the AlphabetIndexer knows about the new Cursor mIndexer.setCursor(newCursor); } public int getPositionForSection(int section) { // AlphabetIndexer does all the hard work return mIndexer.getPositionForSection(section); } public int getSectionForPosition(int position) { // AlphabetIndexer does all the hard work return mIndexer.getSectionForPosition(position); } public Object[] getSections() { // AlphabetIndexer does all the hard work return mIndexer.getSections(); } } </code></pre>
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    1. POHow do you create an alphabetical scroll view like the one below? Android / Eclipse
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    1. USianhanniballake
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    1. COWhen it asks me "YOUR_SORT_COLUMN_NAME" is marked as an error what does it mean. Same for "swapCursor(Cursor newCursor)" & "MyAdapter". Why is this?
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      1. USKing Tutankhamun
    2. COHow do I create a new Cursor?
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    3. CO`Cursor`s are returned by `ContentProviders` or by [database queries](http://developer.android.com/training/basics/data-storage/databases.html). `YOUR_SORT_COLUMN_NAME` is the name of the column from the `Cursor` that you want to sort on.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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