android - View 必须有标签

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 中的 MainActivity 扩展了库模块的 BaseActivity，因此获得了一个抽象方法来覆盖:

MainActivity 扩展 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);
        }
    }

当我运行该应用程序时，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 中都有布局标记。

我试过 this没有成功。

mBinding.viewStub.getViewStub().setLayoutResource(getLayoutId()) 是 BaseActivity 中的一个问题，因为它会尝试从 AppModule 获取布局？ 如果是这样，我该如何解决？

如果您知道答案，请尝试解释为什么会发生这种情况以及解决方案...

已经尝试过

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

如果您使用自定义类作为 your_layout.xml 的 Root View 那么你必须覆盖 View 的所有构造函数

你的类

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){
        ...
    }
}

你的布局

<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>