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POHow can I use this.getSelectedItemId() in Android
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I start learning android just now with sample examples. I encountered one problem. <pre><code>public class ContactActivity extends ListActivity implements OnItemClickListener { private Cursor mCursor; private ListAdapter mAdapter; private static final String[] mContent = new String[]{ ContactDbHelper._ID,ContactDbHelper.NAME,ContactDbHelper.PHONE }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mCursor = managedQuery(ContactProvider.CONTENT_URI, mContent, null, null, null); mAdapter = new SimpleCursorAdapter(this, R.layout.main, mCursor, new String[]{ ContactDbHelper.NAME, ContactDbHelper.PHONE }, new int[]{ R.id.name, R.id.phone } ); setListAdapter(mAdapter); getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE); getListView().setOnItemClickListener(this); } @Override public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) { Log.i("position: ", "" + position); Log.i("id", "" + id); setSelection(position); } @Override public boolean onOptionsItemSelected(MenuItem item) { long id = this.getSelectedItemId(); Log.i("id: ", "" + id); switch(item.getItemId()) { case IDM_ADD: { CallAddContactDialog(); } break; case IDM_EDIT: if(id > 0) { CallEditContactDialog(id); } else { Toast.makeText(this,R.string.toast_notify,Toast.LENGTH_SHORT).show(); } break; case IDM_DELETE: if (id > 0) { CallDeleteContactDialog(id); } else { Toast.makeText(this, R.string.toast_notify, Toast.LENGTH_SHORT).show(); } break; } return super.onOptionsItemSelected(item); } } </code></pre> It has been written here - <code>this.getSelectedItemId()</code> , and the code returned <a href="http://developer.android.com/reference/android/widget/AdapterView.html#INVALID_ROW_ID" rel="nofollow">INVALID_ROW_ID</a>, I read its <a href="http://developer.android.com/reference/android/widget/AdapterView.html#getSelectedItemId%28%29" rel="nofollow">documentation</a>, but I didn't find any way to resolve it. What do I need to add to resolve the problem ? What does this.getSelectedItemId() returned , in general? Thanks in advance! EDIT: My xml file like this: <pre><code><?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:textSize="18sp"/> <TextView android:id="@+id/phone" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:textSize="18sp" android:paddingRight="10dp"/> </RelativeLayout> </code></pre>
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How can I use this.getSelectedItemId() in Android
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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.