AsyncTask を使用して ListView を埋めようとしています。コメントに含まれる問題
private class DownloadDataTask extends AsyncTask<String, Void, Cursor> {
private final ProgressDialog dialog = new ProgressDialog(ctx);
@Override
protected void onPreExecute() {
this.dialog.setMessage(ctx.getString(R.string.AcquiringData));
this.dialog.show();
}
@Override
protected Cursor doInBackground(final String... args) {
DbAdapter dbAdapter = new DbAdapter(ctx);
dbAdapter.open();
// normally when I call this method from main class it reurns cursor full of values
Cursor cursor = dbAdapter.fetchAllItemsInExpenses();
return cursor;
}
protected void onPostExecute(final Cursor cursor) {
if (this.dialog.isShowing()) {
this.dialog.dismiss();
//cursor is empty
}
ctx
メインクラス OnCreate() に設定されている Context です
fetchAllItemsInExpenses() メソッドを貼り付ける次のリクエスト:
public Cursor fetchAllItemsInExpenses() {
String query = "SELECT ... " //(some terribly boring and long query string, but trust me, it works perfectly fine)
return SQLDb.rawQuery(query, null);
}