视图中的Android - 视图标签不正确：null（CursorAdapter和DataBinding） [英] Android - view tag isn't correct on view:null (CursorAdapter and DataBinding)

问题描述

所以昨天我终于找到了一些尝试新的DataBinding库的时间。我试图使用它与CursorAdapter，但没有成功。

So yesterday I have finally found some time to try new DataBinding library. I have tried to use it with CursorAdapter but with no success.

由于Androidguys写在他们的页面上：

As Androidguys written on their page:

如果您在ListView或RecyclerView
适配器中使用数据绑定项，您可能更喜欢使用：

If you are using data binding items inside a ListView or RecyclerView adapter, you may prefer to use:

ListItemBinding binding = ListItemBinding.inflate(layoutInflater, viewGroup, false);
//or
ListItemBinding binding = DataBindingUtil.inflate(layoutInflater, R.layout.list_item, viewGroup, false);

但是在CursorAdapter中，我必须将Inflating和Binding分为2种方法。那么如何正确实现呢？大多数情况下我得到一个异常：视图标签在视图上是不正确的：null

But in CursorAdapter I have to separate Inflating and Binding into 2 methods. So How correctly implement it? Mostly I got an Exception: view tag isn't correct on view:null

private class BookCursorAdapter extends CursorAdapter {

    public BookCursorAdapter(Context context) {
        super(context, null, 0);
    }

    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        BookListItemBinding binding = DataBindingUtil.inflate(getLayoutInflater(), R.layout.book_list_item, parent, false);
        return binding.getRoot();

        // or just
        // return getLayoutInflater().inflate(R.layout.book_list_item, parent, false);
    }

    @Override
    public void bindView(View view, Context context, Cursor cursor) {
        // here it fails (and i cannot see source code of bind method)
        BookListItemBinding.bind(view).setBook(new Book(cursor));
    }
}

如何正确实现与CursorAdapter的绑定？ >

How to correctly implement binding with CursorAdapter?

10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：致命例外：主10-14 06:25 ：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：Process：kandrac.xyz.library，PID：6231 10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：java.lang .RuntimeException：视图标签在视图上不正确：null 10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at kandrac.xyz.library.databinding.BookListItemBinding.bind（BookListItemBinding.java ：135）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at kandrac.xyz.library.MainActivity $ BookCursorAdapter.bindView（MainActivity.java:95）10-14 06:25： 43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.widget.CursorAdapter.getView（CursorAdapter.java:254）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在 android.widget.AbsListView.obtainView（AbsListView.java:2347）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android.widget.ListView.makeAndAddView（ListView.java:1864） 10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.widget.ListView.fillDown（ListView.java:698）10-14 06：25：43.847 6231-6231 / kandrac。 xyz.library E / AndroidRuntime：在android.widget.ListView.correctTooLow（ListView.java:1474）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android.widget.ListView。 fillGap（ListView.java:672）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.widget.AbsListView.trackMotionScroll（AbsListView.java:4991）10-14 06:25 ：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.widget.AbsListView.scrollIfNeeded（AbsListView.java:3418）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime ：在android.widget.AbsListView.onTouchMove（AbsListView.java:3801）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.widget.AbsListView.onTouchEvent（AbsListView.java:3632）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android.view.View.dispatchTouchEvent（View.java:8471）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup .java：2399）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2092）10-14 06：25：43.847 6231 -6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2405）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android .view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2106）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2405）10 -14 06:25:43.847 6231- 6231 / kandrac.xyz.library E / AndroidRuntime：在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2106）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android。 view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2405）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2106）10- 14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2405）10-14 06：25：43.847 6231-6231 / kandrac.xyz。库E / AndroidRuntime：在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2106）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android.view.ViewGroup.dispatchTransformedTouchEvent ViewGroup.java:2405）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2106）10-14 06：25：43.847 6231-6231 / kan drac.xyz.library E / AndroidRuntime：在android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2405）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android.view。 ViewGroup.dispatchTouchEvent（ViewGroup.java:2106）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at com.android.internal.policy.impl.PhoneWindow $ DecorView.superDispatchTouchEvent（PhoneWindow。 java：2369）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent（PhoneWindow.java:1719）10-14 06 ：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.app.Activity.dispatchTouchEvent（Activity.java:2742）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent（WindowCallbackWrapper.java:60）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at com.android。实习生al.policy.impl.PhoneWindow $ DecorView.dispatchTouchEvent（PhoneWindow.java:2330）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android.view.View.dispatchPointerEvent（View。 java：8666）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl $ ViewPostImeInputStage.processPointerEvent（ViewRootImpl.java:4123）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl $ ViewPostImeInputStage.onProcess（ViewRootImpl.java:3989）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime ：at android.view.ViewRootImpl $ InputStage.deliver（ViewRootImpl.java:3544）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl $ InputStage.onDeliverToNext（ ViewRootImpl.java:3597）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl $ InputStage.forward（ViewRootImpl.java:3563）10-14 06:25 ：43.847 6231-6231 / kand rac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl $ AsyncInputStage.forward（ViewRootImpl.java:3680）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android。 view.ViewRootImpl $ InputStage.apply（ViewRootImpl.java:3571）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl $ AsyncInputStage.apply（ViewRootImpl.java： 3737）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl $ InputStage.deliver（ViewRootImpl.java:3544）10-14 06：25：43.847 6231- 6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl $ InputStage.onDeliverToNext（ViewRootImpl.java:3597）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl $ InputStage.forward（ViewRootImpl.java:3563）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl $ InputStage.apply（ViewRootImpl。 java：3571）10-14 06：25：43.847 6 231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl $ InputStage.deliver（ViewRootImpl.java:3544）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime ：在android.view.ViewRootImpl.deliverInputEvent（ViewRootImpl.java:5807）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android.view.ViewRootImpl.doProcessInputEvents（ViewRootImpl.java： 5781）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl.enqueueInputEvent（ViewRootImpl.java:5752）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android.view.ViewRootImpl $ WindowInputEventReceiver.onInputEvent（ViewRootImpl.java:5897）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android。 view.InputEventReceiver.dispatchInputEvent（InputEventReceiver.java:185）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：在android.view.InputEventReceiver.nativeConsumeBatchedInputE通风口（Native Method）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.InputEven

10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: FATAL EXCEPTION: main 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: Process: kandrac.xyz.library, PID: 6231 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: java.lang.RuntimeException: view tag isn't correct on view:null 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at kandrac.xyz.library.databinding.BookListItemBinding.bind(BookListItemBinding.java:135) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at kandrac.xyz.library.MainActivity$BookCursorAdapter.bindView(MainActivity.java:95) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.widget.CursorAdapter.getView(CursorAdapter.java:254) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.widget.AbsListView.obtainView(AbsListView.java:2347) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.widget.ListView.makeAndAddView(ListView.java:1864) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.widget.ListView.fillDown(ListView.java:698) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.widget.ListView.correctTooLow(ListView.java:1474) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.widget.ListView.fillGap(ListView.java:672) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.widget.AbsListView.trackMotionScroll(AbsListView.java:4991) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3418) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.widget.AbsListView.onTouchMove(AbsListView.java:3801) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.widget.AbsListView.onTouchEvent(AbsListView.java:3632) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.View.dispatchTouchEvent(View.java:8471) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2399) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2092) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2369) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1719) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.app.Activity.dispatchTouchEvent(Activity.java:2742) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2330) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.View.dispatchPointerEvent(View.java:8666) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4123) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3989) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3737) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5807) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5781) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5752) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5897) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method) 10-14 06:25:43.847 6231-6231/kandrac.xyz.library E/AndroidRuntime: at android.view.InputEven

推荐答案

根据关于数据绑定的Android开发者视频它看起来像ItemBinding被设置为视图的标签（在它们的情况下它被传递在ViewHolder中）并稍后检索。这是我发现想法来找到绑定内部视图：

Based on Android developers video about databinding It looks like ItemBinding is set as tag for view (in their case it is passed inside ViewHolder) and retrieved later. Thats where I found idea to find binding inside views:

所以解决方案是：

private class BookCursorAdapter extends CursorAdapter {

    ...

    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        BookListItemBinding binding = BookListItemBinding.inflate(getLayoutInflater(), parent, false);
        return binding.getRoot();
    }

    @Override
    public void bindView(View view, Context context, Cursor cursor) {
        Book book = new Book(cursor);
        BookListItemBinding binding = DataBindingUtil.getBinding(view);
        binding.setBook(book);
    }

}

这篇关于视图中的Android - 视图标签不正确：null（CursorAdapter和DataBinding）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！