Question

在布局中添加了一些引用后，这些视图会从我的viewmodel中引用LiveData对象，从而开始出现数据绑定错误。我已经在其他布局中做了很多次，但是我从来没有遇到过这个问题。该错误并不能说明什么地方出了问题。

这是错误消息

CheckoutBindingImpl.java:57: error: cannot find symbol
        java.lang.String callbackArg_0 = android.databinding.adapters.TextViewBindingAdapter.getTextString(firstName);
                                                ^
  symbol:   variable databinding
  location: variable android of type Button
/home/Droids/vv/sample-app/app/build/generated/source/kapt/stageCheckoutDebug/com/sample/databinding/FragmentCheckoutBindingImpl.java:685: error: cannot find symbol
        android.databinding.adapters.TextViewBindingAdapter.setTextWatcher(this.firstName, (android.databinding.adapters.TextViewBindingAdapter.BeforeTextChanged)null, (android.databinding.adapters.TextViewBindingAdapter.OnTextChanged)null, (android.databinding.adapters.TextViewBindingAdapter.AfterTextChanged)null, firstNameandroidTextAttrChanged);
               ^
  symbol:   variable databinding
  location: variable android of type Button
/home/Droids/vv/sample-app/app/build/generated/source/kapt/stageCheckoutDebug/com/sample/databinding/FragmentCheckoutBindingImpl.java:713: error: cannot find symbol
        android.databinding.adapters.TextViewBindingAdapter.setText(this.firstName, viewModelFirstNameGetValue);
               ^
  symbol:   variable databinding
  location: variable android of type Button
Note: /home/Droids/vv/sample-app/app/build/generated/source/kapt/stageCheckoutDebug/com/sample/injection/DaggerAppComponent.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
3 errors

这是布局的一部分：

    <EditText
        android:id="@+id/first_name"
        style="@style/CheckoutInputField"
        android:layout_width="0dp"
        android:layout_height="@dimen/checkout_edit_text_height"
        android:layout_marginEnd="16dp"
        android:layout_marginTop="8dp"
        android:inputType="textPersonName"
        android:text="@={viewModel.firstName}"
        app:layout_constraintEnd_toStartOf="@+id/last_name"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/first_label" />

这是视图模型：

abstract class CheckoutViewModel : ViewModel() {
    abstract var cartNavigator: CartNavigator?

    abstract val firstName: MutableLiveData<String>

    /* other stuff *
}

viewmodel实现很简单：

class CheckoutViewModelImpl @Inject constructor(
    private val schedulerProvider: SchedulerProvider
) : CheckoutViewModel() {
    override val firstName = MutableLiveData<String>()

    /* other stuff *
}

这是自动生成类的一部分，其中抛出了一个错误（与android.databinding.adapters一致）：

    if ((dirtyFlags & 0x800L) != 0) {
        // api target 1

        this.android.setOnClickListener(mCallback58);
        this.apple.setOnClickListener(mCallback59);
        this.back.setOnClickListener(mCallback55);
        this.debitCredit.setOnClickListener(mCallback56);
        android.databinding.adapters.TextViewBindingAdapter.setTextWatcher(this.firstName, (android.databinding.adapters.TextViewBindingAdapter.BeforeTextChanged)null, (android.databinding.adapters.TextViewBindingAdapter.OnTextChanged)null, (android.databinding.adapters.TextViewBindingAdapter.AfterTextChanged)null, firstNameandroidTextAttrChanged);
        this.paypal.setOnClickListener(mCallback57);
    }

这也是自动生成文件中的错误之一的屏幕截图：

关于此问题可能有什么建议？

Answer 1

对于所有遇到此错误的用户，请确保您没有将android：id意外设置为“ @ + id / android”。在我的情况下，ID设置为android。更改ID后，错误已修复。

视图模型绑定的数据绑定错误

1 个答案: