在扑扑中使用typeaheadformfield搜索数据库sqlite

Question

我正在尝试制作一个typeaheadformfield来选择其他界面中listview的成员。

这是我的代码：

TypeAheadFormField(
              textFieldConfiguration:TextFieldConfiguration(
              controller:c2,
              decoration: InputDecoration(
                labelText: ' Mdicament',
                hintText: 'Select a Mdicament',
                border: OutlineInputBorder(
                  borderRadius: BorderRadius.circular((20.0)),
                ),
              )),
              suggestionsCallback: (pattern){
                return  helper.getMedicamentMapList();
              },
              itemBuilder:(context,suggestion){
                return ListTile(
                  title:Text(suggestion),
                );
              },
              transitionBuilder:(context,suggestionsBox,controller){
                return suggestionsBox;
              },
              onSuggestionSelected:(suggestion){
                c2.text=suggestion;
               // Medicament.getMap(suggestion);
              },
              validator:(val)=>val.isEmpty ? 'please select a medic...' : null,
              onSaved:(val) => setState(
                    ()=> _nom=val,

          )
            ),

我在databasehelper中的未来是：

Future<List<Map<String, dynamic>>> getMedicamentMapList() async {
  Database db = await this.database;

  //var result1 =  await db.rawQuery("SELECT * FROM $tableName ORDER BY $_id ASC");
  var result = await db.query(medicaTable, orderBy: "$colId ASC");
  return result;
}

我收到此错误：

I / SurfaceView（30515）：updateWindow-OnPreDrawListener，mHaveFrame = true，此= io.flutter.embedding.android.FlutterSurfaceView {5e96fa0 VE .... ........ 0,0-720 ，1184} D / FeatureProxyBase（30515）：FeatureProxyBase类构造函数 D / FeatureProxyBase（30515）：getService（），serviceName = multiwindow_service_v1 V / InputMethodManager（30515）：开始输入：io.flutter.embedding.android.FlutterView {1a277759 VFE ..... F ...... 0,0-720,1184} ic = io.flutter.plugin .editing.InputConnectionAdaptor @ 3d6ee801 tba = EditorInfo {packageName = example.pharmacyapp，inputType = 0x80081，imeOptions = 0x2000006，privateImeOptions = null} controlFlags =＃0 I / InputMethodManager（30515）：[startInputInner] EditorInfo {packageName = example.pharmacyapp，inputType = 0x80081，imeOptions = 0x2000006，privateImeOptions = null}，windowGainingFocus = null，mServedView = io.flutter.embedding.android.FlutterView {1a277759 VFE。 .... .F ...... 0,0-720,1184}，mServedInputConnectionWrapper = android.view.inputmethod.InputMethodManager $ ControlledInputConnectionWrapper @ 24af46a6 I / SurfaceView（30515）：updateWindow-setFrame，这= io.flutter.embedding.android.FlutterSurfaceView {5e96fa0 V.E ......... 0,0-720,1184} I / SurfaceView（30515）：updateWindow-OnPreDrawListener，mHaveFrame = true，这= io.flutter.embedding.android.FlutterSurfaceView {5e96fa0 V.E ........... 0,0-720,1184} I / SurfaceView（30515）：updateWindow-setFrame，这= io.flutter.embedding.android.FlutterSurfaceView {5e96fa0 V.E ......... 0,0-720,1184} I / SurfaceView（30515）：updateWindow-OnPreDrawListener，mHaveFrame = true，这= io.flutter.embedding.android.FlutterSurfaceView {5e96fa0 V.E ........... 0,0-720,1184}