ListView示例在结果视图中复制联系人
我尝试了Android API指南中的ListView示例。 或多或少，我将示例中的代码复制到一个活动中（我现在只留下了进度条）。 除了ListView显示我在我的设备上运行的每个联系人的重复项（运行Nexus 7和Android 4.2）之外，一切正常。 每个联系人在列表视图中重复6-7次。 我正在使用的光标已经返回太多结果（它应该只返回3个项目，因为我的Nexus atm只有三个联系人）。 当我检查RAW_CONTACT_ID时，重复项总是指向相同的id值（即我只能得到3个唯一的ID）。 这表明它不是我的视图代码有一些问题。
所以问题是适配器中会出现什么问题？ 为什么光标会为所有联系人返回重复项？ 或者设备上是否存在导致这些重复项被返回的内容。
我通过其他问题看过，但似乎没有关于这个特殊问题。
public class ThemeSelectorActivity extends ListActivity
implements LoaderManager.LoaderCallbacks{
private static final String TAG = "ThemeSelector";
// The rows that we will retrieve from the db (Contacts used as dummy data)
static final String[] PROJECTION = new String[] {ContactsContract.Data._ID,
ContactsContract.Data.DISPLAY_NAME};
// The select criteria for fetching contacts
static final String SELECTION = "((" +
ContactsContract.Data.DISPLAY_NAME + " NOTNULL) AND (" +
ContactsContract.Data.DISPLAY_NAME + " != '' ))";
// The Adapter being used to display the list's data
SimpleCursorAdapter mAdapter;
@Override
public void onCreate(Bundle savedInstanceState)
{
Log.d(TAG, "Create...");
super.onCreate(savedInstanceState);
// set the listview to be selectable
getListView().setChoiceMode(AbsListView.CHOICE_MODE_SINGLE);
// For the cursor adapter, specify which columns go into which views
String[] fromColumns = {ContactsContract.Data.DISPLAY_NAME};
int[] toViews = {android.R.id.text1}; // The TextView in simple_list_item_1
// Create an empty adapter we will use to display the loaded data.
// We pass null for the cursor, then update it in onLoadFinished()
mAdapter = new SimpleCursorAdapter(this,
android.R.layout.simple_list_item_1, null,
fromColumns, toViews, 0);
setListAdapter( mAdapter );
// Prepare the loader. Either re-connect with an existing one,
// or start a new one.
getLoaderManager().initLoader(0, null, this);
}
// Called when a new Loader needs to be created
public Loader onCreateLoader(int id, Bundle args) {
// Now create and return a CursorLoader that will take care of
// creating a Cursor for the data being displayed.
return new CursorLoader(this, ContactsContract.Data.CONTENT_URI,
PROJECTION, SELECTION, null, null);
}
// Called when a previously created loader has finished loading
public void onLoadFinished(Loader loader, Cursor data) {
// Swap the new cursor in. (The framework will take care of closing the
// old cursor once we return.)
mAdapter.swapCursor(data);
}
// Called when a previously created loader is reset, making the data unavailable
public void onLoaderReset(Loader loader) {
// This is called when the last Cursor provided to onLoadFinished()
// above is about to be closed. We need to make sure we are no
// longer using it.
mAdapter.swapCursor(null);
}
@Override
/**
* Start activity that shows a preview of the selected theme
*/
public void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
//String item = (String) getListAdapter().getItem(position);
//Toast.makeText(this, item + " selected", Toast.LENGTH_LONG).show();
}
}
ContactsContract.Data.CONTENT_URI显示联系人的所有数据
你应该使用ContactsContract.Contacts.CONTENT_URI
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