Android 可观察房间实体（kotlin）

我正在尝试使房间实体可观察（extend BaseObservable），这样它就可以在具有双向绑定的LiveData中使用。我有一个数据类：

@Entity
data class Model(

@PrimaryKey(autoGenerate = true)
val id: Int,
val name: String) : Serializable

在XML中，我想这样使用它：

<EditText
            ...
            android:text="@{viewModel.myLiveData.name}"

这不起作用，并导致：

> A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution
> java.lang.reflect.InvocationTargetException (no error message)

---

回答我自己的问题。。。 所以我的问题遗漏了一个重要的细节——在我的模型类中，我有第二个构造函数没有用@Ignore注释，所以Android Room抱怨“Room无法选择一个构造函数，因为多个构造函数都是合适的。试着用@Ignore注释不需要的构造函数。”

但是（！）由于某种奇怪的原因，该错误仅在Java中为类显示，而在Kotlin中没有显示

所以在Java中我有这样一个类：

@Entity
public class Model extends BaseObservable implements Serializable {

   @PrimaryKey(autoGenerate = true)
   public int id;

   private String name;

   //@Ignore (THIS SHOULD BE UNCOMMENTED TO GET RID OF AN ERROR!!!!!
   public Model(String name) {
      this.id = 0;
      this.name = name;
   }

   public Model(int id, String name) {
      this.id = id;
      this.name = name;
   }

   public void setName(String name) {
      if (!Objects.equals(name, this.name)) {
          this.name = name;
          notifyPropertyChanged(BR.name);
      }
   }

   @Bindable
   public String getName() {
      return name;
   } 
}

对于这个Java类，我得到了：

Room cannot pick a constructor since multiple constructors are suitable. Try to annotate unwanted constructors with @Ignore.

对于等效的Kotlin类：

@Entity
class Model: BaseObservable,  Serializable {

  constructor(id: Int, name: String) {
      this.id = id
      this.name = name
  }

  // @Ignore - THIS VAS MISSING!!!
  constructor(name: String): this(0, name)

  @PrimaryKey(autoGenerate = true)
  var id: Int = 0

  @get:Bindable
  var name: String = ""
      set(value) {
          field = value
          notifyChange()
      } 
}

我只得到以下错误：

> Task :app:kaptDebugKotlin FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:kaptDebugKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution
> java.lang.reflect.InvocationTargetException (no error message)

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 2s
28 actionable tasks: 2 executed, 26 up-to-date

---

令人失望的是，它没有提到第二个构造函数

你能把整个错误日志都贴出来吗？这就是我得到的所有错误

@Entity
class Model: BaseObservable,  Serializable {

  constructor(id: Int, name: String) {
      this.id = id
      this.name = name
  }

  // @Ignore - THIS VAS MISSING!!!
  constructor(name: String): this(0, name)

  @PrimaryKey(autoGenerate = true)
  var id: Int = 0

  @get:Bindable
  var name: String = ""
      set(value) {
          field = value
          notifyChange()
      } 
}

> Task :app:kaptDebugKotlin FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:kaptDebugKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution
> java.lang.reflect.InvocationTargetException (no error message)

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 2s
28 actionable tasks: 2 executed, 26 up-to-date