我在我的一个活动中使用ExpandableListView，并使用自定义SimpleCursorAdapter填充子视图和组视图（单独的.xml文件，每个文本视图有几个文本视图）。我希望具有以下功能：单击一个组时，子列表将填充，并且子列表的位置0中将填充另一个标题（两个文本视图），以充当每列数据的标题孩子显示。
这是我的SimpleCursorAdapter的代码以及我活动中相关代码的片段：
SimpleCursorAdapter：
public class PayeeCursorAdapter extends SimpleCursorTreeAdapter {
private final String LOG_TAG = getClass().getSimpleName();
private PayeeActivity mActivity;
protected final HashMap<Integer, Integer> mGroupMap;
// No cursor is added to the adapter so that it only runs when the CursorLoader runs, instead of every time the activity does
public PayeeCursorAdapter(
Context context, // The activity where the adapter will be running
int groupLayout, // The .xml layout file for the group layout
int childLayout, // The .xml layout file for the child layout
String[] groupFrom, // String of column names in the cursor that is the data for each group item
int[] groupTo, // The ID of the views in the group layout that display the column from the groupFrom String[]
String[] childrenFrom, // String of column names in the cursor that is the data for each child item
int[] childrenTo) { // The ID of the views in the child layout that display the column from the childFrom String[]
super(context, null, groupLayout, groupFrom, groupTo, childLayout, childrenFrom, childrenTo);
mActivity = (PayeeActivity) context;
mGroupMap = new HashMap<Integer, Integer>();
}
@Override
protected Cursor getChildrenCursor(Cursor groupCursor) {
int groupPos = groupCursor.getPosition();
int groupId = groupCursor.getInt(groupCursor.getColumnIndex(BillMeContract.PayeeEntry._ID));
Log.d(LOG_TAG, "getChildrenCursor() for groupPos " + groupPos);
Log.d(LOG_TAG, "getChildrenCursor() for groupId " + groupId);
mGroupMap.put(groupId, groupPos);
Loader<Cursor> loader = mActivity.getSupportLoaderManager().getLoader(groupId);
if(loader != null && !loader.isReset()) {
mActivity.getSupportLoaderManager().restartLoader(groupId, null, mActivity);
} else {
mActivity.getSupportLoaderManager().initLoader(groupId, null, mActivity);
}
return null;
}
public HashMap<Integer, Integer> getGroupMap(){
return mGroupMap;
}
}
的活动：
ExpandableListView expandablePayeeListView = (ExpandableListView) findViewById(R.id.payee_exp_list);
mAdapter = new PayeeCursorAdapter(
this,
R.layout.list_group_payee,
R.layout.list_item_payee_tx,
new String[] {BillMeContract.PayeeEntry.COL_NAME},
new int[] {R.id.payee_list_header},
new String[] {BillMeContract.TransactionEntry.COL_DATE,
BillMeContract.TransactionEntry.COL_PAYMENT,
BillMeContract.TransactionEntry.COL_TYPE},
new int[] {R.id.payee_list_item_date,
R.id.payee_list_item_amount,
R.id.payee_list_item_type});
mAdapter.setViewBinder(new SimpleCursorTreeAdapter.ViewBinder() {
public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
if(columnIndex == 4) {
int type = cursor.getInt(columnIndex);
TextView textView = (TextView) view;
if(type == BillMeContract.TransactionEntry.TYPE_CASH) {
textView.setText(R.string.tx_spinner_type_cash);
} else if (type == BillMeContract.TransactionEntry.TYPE_CHEQUE) {
textView.setText(R.string.tx_spinner_type_cheque);
} else if (type == BillMeContract.TransactionEntry.TYPE_E_TRANSFER) {
textView.setText(R.string.tx_spinner_type_e_transfer);
}
return true;
} else if(columnIndex == 3){
String cost = String.format(Locale.CANADA, "%.2f", cursor.getDouble(columnIndex));
cost = "$" + cost;
TextView textView = (TextView) view;
textView.setText(cost);
return true;
}
return false;
}
});
expandablePayeeListView.setAdapter(mAdapter);