Obtenga enlace desde la clase de vista
Tengo una clase CustomView con un diseño de enlace de datos que toma una variable. En el diseño que contiene el CustomView, quiero pasar un atributo al CustomView y hacer que el CustomView pase ese atributo al enlace de su propio diseño. Esto es lo que tengo:
public class CustomView extends LinearLayout
{
public CustomView(Context inContext, AttributeSet inAttrs)
{
super(inContext, inAttrs);
inflate(inContext, R.layout.custom_view, null);
}
@BindingAdapter({"app:variable"})
public static void SetVariable(CustomView inCustomView, VariableType inMyVariable)
{
CustomViewBinding binding = DataBindingUtil.getBinding(inCustomView);
binding.setMyVariable(inMyVariable);
}
}
Esto falla al intentar extraer el enlace de la vista. ¿Es esto posible? Aquí está el seguimiento de la pila:
java.lang.NullPointerException: Attempt to invoke virtual method 'void xxx.databinding.CustomViewBinding.setVariableType(xxx.VariableType)' on a null object reference
at xxx.CustomView.SetDynamicList(CustomView.java:32)
at xxx.MyFragmentBinding.executeBindings(MyFragmentBinding.java:116)
at android.databinding.ViewDataBinding.executePendingBindings(ViewDataBinding.java:350)
at android.databinding.ViewDataBinding$6.run(ViewDataBinding.java:167)
at android.databinding.ViewDataBinding$7.doFrame(ViewDataBinding.java:233)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:856)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:603)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Y si cambio
DataBindingUtil.getBinding(inCustomView)
a
DataBindingUtil.bind(inCustomView)
entonces entiendo esto:
java.lang.IllegalArgumentException: View is not a binding layout
at android.databinding.DataBindingUtil.bind(DataBindingUtil.java:166)
at android.databinding.DataBindingUtil.bind(DataBindingUtil.java:140)
at xxx.CustomView.SetDynamicList(CustomView.java:30)
- at xxx.databinding.MyFragmentBinding.executeBindings(MyFragmentBinding.java:116)
at android.databinding.ViewDataBinding.executePendingBindings(ViewDataBinding.java:350)
at android.databinding.ViewDataBinding$6.run(ViewDataBinding.java:167)
at android.databinding.ViewDataBinding$7.doFrame(ViewDataBinding.java:233)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:856)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:603)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Esto podría implicar que el archivo de diseño no está formateado para la vinculación de datos, pero lo es. Tiene el elemento de diseño y el elemento de datos con variables y todo.