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POAndroid - Displaying Cursor Results from DB in ListView
 

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  1. POAndroid - Displaying Cursor Results from DB in ListView
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    <p>I have been trying to get my Cursor to display correctly in listview. it displays correctly when using a toast so the cursor is retrieving the data correctly but i'm having trouble making it display in list format. </p> <p>Should be 6 columns in each row.</p> <p>It only displays one row with no data. I'm sure it is a very basic problem. Maybe somebody could tell me where I'm going wrong, I would be grateful.</p> <p>DisplayCursor.Java</p> <pre><code>public class DisplayCursor extends ListActivity { MyDBManager db = new MyDBManager(this); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_display_cursor); db.open(); Cursor cursor = db.getAllRows(); startManagingCursor(cursor); String[] columns = new String[] { MyDBManager.KEY_DESCRIPTION, MyDBManager.KEY_PERCENTAGE, MyDBManager.KEY_PRICE, MyDBManager.KEY_VOLUME, MyDBManager.KEY_VFM, MyDBManager.KEY_QUANTITY }; int[] to = new int[] { R.id.description,R.id.perc,R.id.price,R.id.units,R.id.vol, R.id.vfm }; SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, R.layout.row, cursor, columns, to); this.setListAdapter(mAdapter); db.close(); } } </code></pre> <p>row.xml</p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;TextView android:id="@+id/description" android:layout_width="140dp" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginTop="27dp" /&gt; &lt;TextView android:id="@+id/vol" android:layout_width="30dp" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/description" android:layout_alignBottom="@+id/description" android:layout_toRightOf="@+id/description" /&gt; &lt;TextView android:id="@+id/perc" android:layout_width="30dp" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/vol" android:layout_alignBottom="@+id/vol" android:layout_toRightOf="@+id/vol" /&gt; &lt;TextView android:id="@+id/price" android:layout_width="30dp" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/perc" android:layout_alignBottom="@+id/perc" android:layout_toRightOf="@+id/perc" /&gt; &lt;TextView android:id="@+id/units" android:layout_width="30dp" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/price" android:layout_alignBottom="@+id/price" android:layout_toRightOf="@+id/price" /&gt; &lt;TextView android:id="@+id/vfm" android:layout_width="80dp" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/units" android:layout_alignBottom="@+id/units" android:layout_toRightOf="@+id/units" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>activity_display_cursor.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content"&gt; &lt;ListView android:id="@android:id/list" android:layout_width="wrap_content" android:layout_height="wrap_content"/&gt; &lt;TextView android:id="@android:id/empty" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/nodata"/&gt; &lt;/LinearLayout&gt; </code></pre>
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    1. COOfftopic: Why are you using a `ListActivity` if you're setting a content view with a `LinearLayout` as the parent?
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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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