Question

我的库模块中有一个抽象的BaseActivity：

 @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //Normal method to inflate the layout
        mBinding = DataBindingUtil.setContentView(this, R.layout.base_view_stub_layout);
        AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
        if (mBinding != null && mBinding.viewStub != null && mBinding.viewStub.getViewStub() != null) {
            mBinding.viewStub.getViewStub().setLayoutResource(getLayoutId());
        }

        if (!hasStubInflated) {
            View inflatedView = mBinding.viewStub.getViewStub().inflate();
            //Abstract method
            onViewStubInflated(inflatedView, savedInstanceState);
            //Normal method to hide progress bar
            onViewStubInflated();
        }
        initControllers();
        handleViews();
        setListeners();
        restoreValues(savedInstanceState);
    }

AppModule的MainActivity扩展了库模块的BaseActivity，因此可以获取一个抽象方法来覆盖：

MainActivity扩展了BaseActivity

private ActivityMainBinding mBinding;

@Override
    public int getLayoutId() {
        return R.layout.activity_main;
    }

@Override
    public void onViewStubInflated(View inflatedView, Bundle savedInstanceState) {
        if (mBinding == null || mBinding.getRoot() != inflatedView) {
            mBinding = ActivityMainBinding.bind(inflatedView);
        }
    }

运行该应用程序时，我得到：

 Caused by: java.lang.RuntimeException: view must have a tag
        at com.example.android.emailapp.DataBinderMapperImpl.getDataBinder(DataBinderMapperImpl.java:67)
        at androidx.databinding.MergedDataBinderMapper.getDataBinder(MergedDataBinderMapper.java:74)
        at androidx.databinding.DataBindingUtil.bind(DataBindingUtil.java:199)
        at androidx.databinding.ViewDataBinding.bind(ViewDataBinding.java:693)
        at com.example.android.emailapp.databinding.ActivityMainBinding.bind(ActivityMainBinding.java:99)
        at com.example.android.emailapp.databinding.ActivityMainBinding.bind(ActivityMainBinding.java:87)
        at com.example.android.emailapp.login.MainActivity.onViewStubInflated(MainActivity.java:86)
        at com.library.android.common.ui.baseui.BaseActivity.onCreate(BaseActivity.java:52)

请注意，我在BaseActivity和MainActivity的xml中都具有布局标签。

我尝试了this，但没有成功。

mBinding.viewStub.getViewStub（）。setLayoutResource（getLayoutId（））是否存在问题，因为它将尝试从AppModule获取布局？那，我该怎么解决？

如果您知道答案，请尝试解释为什么会出现这种情况以及解决方案...

已尝试

View must have a tag error

What does it mean by view must have a tag error

How to use databinding for viewstub

Answer 1

如果您将自定义类用作your_layout.xml的根视图，则必须覆盖所有视图构造器

您的课程

class MyCustomView : FrameLayout {
    constructor(context: Context) : super(context){
        ...
    }

    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs){
        ...
    }
    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr){
        ...
    }
}

您的布局

<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable name="viewModel" type="......" />
    </data>

    <MyCustomView
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </MyCustomView>

</layout>

Answer 2

您还必须用 <layout></layout> 包装 viewStub 的布局，这正是他们所期望的：要么到处使用 DataBinding，要么根本不使用。

如果您不想在 viewStub 上使用 DataBinding，则需要做额外的工作。

例如，如果 itemData 是我的列表视图的 DataBindingImpl 对象，并且我要膨胀某种 more options 覆盖视图存根，那么我需要自己存储膨胀的视图，并避免访问`DataBinding 的 ViewStubProxy 的 mRoot 字段

ViewGroup inflated = (ViewGroup) itemData.someView.getTag();
if(inflated==null) {
    ViewStub stub = itemData.viewStubProxy.getViewStub();
    if(stub!=null) {
        stub.setOnInflateListener(null);
        inflated = (ViewGroup) stub.inflate();
        // what I need is simply to set onClickListener on all of it's children. (one for-loop inside)
        Utils.setOnClickListenersOneDepth(inflated, onClickListener, 3, null);
        itemData.someView.setTag(inflated);
    }
}
if(inflated!=null) {
    // what I need then is to animate the overlay. 
    View mRoot = inflated;
    int width = itemData.getRoot().getWidth();
    mRoot.setAlpha(0);
    mRoot.setTranslationX(width/3);
    mRoot.animate().alpha(1);
    mRoot.animate().translationX(0);
}

永远不要调用 itemData.viewStubProxy.getViewStub().getRoot()、.isInflated() 左右，因为我们现在将 inflated 存储在 DataBindingImpl 对象之外。

视图必须具有标签

2 个答案:

您的课程

您的布局