Question

所以昨天我终于找到了一些时间来尝试新的DataBinding库。我试图将它与CursorAdapter一起使用，但没有成功。

正如Androidguys在他们的页面上写的那样：

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

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？

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：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：在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 andro id.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：在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 ：在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：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：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.library E / AndroidRuntime：at android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2106)10-14 06：25：43.847 6231-623 1 / 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 / 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。库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 / 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。库E / AndroidRun time：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：在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 6231-6 231 / 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 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.ViewRootImpl $ InputStage.deliver（ ViewRootImpl.java:3544)10-14 06:25:43.84 7 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：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：at 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：at android.view .InputEventReceiver.nativeConsumeBatchedInputEvents（Native Method）10-14 06：25：43.847 6231-6231 / kandrac.xyz.library E / AndroidRuntime：at android.view.InputEven

Answer 1

基于Android developers video about databinding看起来ItemBinding被设置为视图的标记（在它们的情况下它在ViewHolder中传递）并稍后检索。多数民众赞成在那里我找到了在视图中找到绑定的想法：

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);
    }

}

Android - 视图标记在视图上不正确：null（CursorAdapter和DataBinding）

1 个答案: