Question

活动A和B包含一个RecyclerView并保存类似的数据，因此他们使用名为AViewModel的公共视图模型

活动A.java

 @BindingAdapter("bind:adapter")
public static void setAdapter(RecyclerView recyclerView, ArrayList<AViewModel> vm) {
    AdapterA adapter = ((AdapterA) recyclerView.getAdapter());
    if (adapter != null) {
        adapter.clearList();
        adapter.addAll(vm);
        adapter.notifyDataSetChanged();
    }
}

活动B.java

 @BindingAdapter("bind:adapter")
public static void setAdapter(RecyclerView recyclerView, ArrayList<AViewModel> vm) {
    AdapterB adapter = ((AdapterB) recyclerView.getAdapter());
    if (adapter != null) {
        adapter.clearList();
        adapter.addAll(vm);
        adapter.notifyDataSetChanged();
    }
}

现在启动活动A时，应用程序崩溃并显示

AdapterA无法强制转换为AdapterB

怀疑setAdapter的类似方法签名。有什么建议可以解决问题的原因吗？

错误记录

E / AndroidRuntime：致命异常：主要过程：com。 .hackthon.listviewpoc，PID：308 java.lang.ClassCastException：com。 .hackthon.listviewpoc.AdapterA 无法投射到com。 .hackthon.listviewpoc.AdapterB 在com.hackthon.listviewpoc.ActivityB.setAdapter（ActivityB.java:39）在 com.hackthon.listviewpoc.databinding.ActivityABinding.executeBindings（ActivityABinding.java:145）在 android.databinding.ViewDataBinding.executeBindingsInternal（ViewDataBinding.java:379）在 android.databinding.ViewDataBinding.executePendingBindings（ViewDataBinding.java:351）在android.databinding.ViewDataBinding $ 6.run（ViewDataBinding.java:178）在 android.databinding.ViewDataBinding $ 5.onViewAttachedToWindow（ViewDataBinding.java:146）在android.view.View.dispatchAttachedToWindow（View.java:14531）在 android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2836）在 android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）在 android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）在 android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）在 android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）在 android.view.ViewGroup.dispatchAttachedToWindow（ViewGroup.java:2843）在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1364）在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1107）在 android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:6013）在 android.view.Choreographer $ CallbackRecord.run（Choreographer.java:858）在android.view.Choreographer.doCallbacks（Choreographer.java:670）在android.view.Choreographer.doFrame（Choreographer.java:606）在 android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:844）在android.os.Handler.handleCallback（Handler.java:739）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:148）在android.app.ActivityThread.main（ActivityThread.java:5417） at java.lang.reflect.Method.invoke（Native Method）在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:726）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:616）

Answer 1

不要定义两个@BindingAdapter("bind:adapter")，只需编写一次并使用instanceof

@BindingAdapter("bind:adapter")
public static void setAdapter(RecyclerView recyclerView, ArrayList<AViewModel> vm) {
    if(recyclerView.getAdapter() instanceof AdapterA){
        AdapterA adapter = ((AdapterA) recyclerView.getAdapter());
        adapter.clearList();
        adapter.addAll(vm);
        adapter.notifyDataSetChanged();
    }
    else if(recyclerView.getAdapter() instanceof AdapterB){
        AdapterB adapter = ((AdapterB) recyclerView.getAdapter());
        adapter.clearList();
        adapter.addAll(vm);
        adapter.notifyDataSetChanged();

    }
}

如果它出现任何错误，请告诉我。

在不同的recyclerViews

1 个答案: