[英]databinding error : databinding does not exist
我試過 listview 應用程序來使用 mvvm 模式。
但我在 android studio 中有錯誤。
我不知道為什么這個項目不起作用。
錯誤:
錯誤:(18, 49) 錯誤:包 com.example.jhseo.flight_mvvm.databinding 不存在
錯誤:(30, 13) 錯誤:找不到符號類 FlightActivityBinding
錯誤:任務 ':app:compileDebugJavaWithJavac' 的執行失敗。
java.lang.RuntimeException:發現數據綁定錯誤。 ****/ 數據綁定錯誤 ****msg:標識符必須具有來自 XML 文件的用戶定義類型。 viewModel 缺少它文件:E:\\workspace_mobile\\test\\Flight-Mvvm\\app\\src\\main\\res\\layout\\flight_item.xml loc:15:27 - 15:35 ****\\ 數據綁定錯誤*** *
飛行活動
public class FlightActivity extends AppCompatActivity implements FlightViewModel.DataListener{
private FlightActivityBinding binding;
private FlightViewModel flightViewModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = DataBindingUtil.setContentView(this, R.layout.flight_activity);
flightViewModel = new FlightViewModel(this, this);
binding.setViewModel(flightViewModel);
setupListVIew(binding.flightListView);
@Override
protected void onDestroy() {
super.onDestroy();
}
@Override
public void onListChanged(ArrayList<Flight> flights) {
FlightListAdapter adapter =(FlightListAdapter) binding.flightListView.getAdapter();
adapter.setFlights(flights);
adapter.notifyDataSetChanged();
}
private void setupListVIew(ListView flightListView) {
FlightListAdapter adapter = new FlightListAdapter(this);
flightListView.setAdapter(adapter);
}
}
飛行視圖模型
public class FlightViewModel {
FlightFactory flightFactory;
...
public ObservableArrayList<Flight> flightList;
private Context context;
private DataListener dataListener;
private Realm realm;
public FlightViewModel(Context context, DataListener dataListener) {
this.context = context;
this.dataListener = dataListener;
init();
loadData();
}
public void setDataListener(DataListener dataListener) { this.dataListener = dataListener; }
...
public void searchByConditionInListAndSet() {
RealmQuery<Flight> query = realm.where(Flight.class);
if (!"".equals(terminal.get())) {
query = query.equalTo("terminal", terminal.get());
}
flightList.addAll(query.findAll().subList(0, (int) query.count()));
if (dataListener != null) {
dataListener.onListChanged(flightList);
}
...
}
public interface DataListener {
void onListChanged(ArrayList<Flight> flights);
}
}
項目視圖模型
public class ItemViewModel extends BaseObservable {
private Flight flight;
private Context context;
public ItemViewModel(Flight flight, Context context) {
this.flight = flight;
this.context = context;
}
...
public void onItemClick(View view) {
//TODO: Detail Page
//context.startActivity();
}
public void setFlight(Flight flight) {
this.flight = flight;
notifyChange();
}
}
飛行活動.xml
飛行項目.xml
<data>
<variable
name="itemModel"
type="com.example.jhseo.flight_mvvm.viewModel.ItemViewModel"/>
</data>
<LinearLayout android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:onClick="@{viewModel::onItemClick}">
<LinearLayout
android:layout_width="50dp"
android:layout_height="wrap_content">
<TextView
android:id="@+id/timeTextView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@{itemModel.time}" />
</LinearLayout>
<LinearLayout
android:layout_width="100dp"
android:layout_height="wrap_content">
<TextView
android:id="@+id/flightStateTextView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@{itemModel.flightState}" />
</LinearLayout>
<LinearLayout
android:id="@+id/destinationi"
android:layout_width="80dp"
android:layout_height="wrap_content">
<TextView
android:id="@+id/destinationTextView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@{itemModel.destination}" />
</LinearLayout>
<LinearLayout
android:id="@+id/counterAndGatei"
android:layout_width="80dp"
android:layout_height="wrap_content">
<TextView
android:id="@+id/counterAndGateTextView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@{itemModel.counterAndGate}" />
</LinearLayout>
<LinearLayout
android:id="@+id/origini"
android:layout_width="70dp"
android:layout_height="wrap_content">
<TextView
android:id="@+id/originTextView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@{itemModel.origin}" />
</LinearLayout>
<LinearLayout
android:id="@+id/carouseli"
android:layout_width="40dp"
android:layout_height="wrap_content">
<TextView
android:id="@+id/carouselTextView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@{itemModel.carousel}" />
</LinearLayout>
<LinearLayout
android:id="@+id/exitDoori"
android:layout_width="70dp"
android:layout_height="wrap_content">
<TextView
android:id="@+id/exitDoorTextView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="@{itemModel.exitDoor}" />
</LinearLayout>
</LinearLayout>
</layout>
你得到的錯誤是相當清楚的:沒有標識viewModel
中定義flight_item.xml
。
改變
android:onClick="@{viewModel::onItemClick}"
到
android:onClick="@{itemModel::onItemClick}"
在flight_item.xml
文件中。
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