获取错误：使用数据绑定作为泛型类型构建多模块项目和类时，包com.mydomain.databinding不存在

Question

I have a multi-module project where I set my databinding classes as a generic type requirement:

public abstract class BaseActivity<DataBinding extends ViewDataBinding> {
    //Rest of the code...
}

However, if I extend this activity on a submodule, sometimes I get the following build error:

error: cannot find symbol public void myMethod(MyActivityBinding dataBinding) {

error: package com.mydomain.databinding does not exist import com.mydomain.databinding.MyActivityBinding;

Sometimes, creating another activity that extends from MyActivity and putting it on the main app module fixes the issue. But in some cases I can't pinpoint the problem, and I consistently get the same error message.

I already tried cleaning and rebuilding the project and also invalidating Android Studio cache and restarting it without success.

Any ideas on how to at least investigate what could be causing this problem?

Answer 1

Not sure about the root cause of the problem but I have similar issue and posted answer here https://stackoverflow.com/a/47718646/3160214

In few words, this is how solution looks like:

class A<BINDING extends ViewDataBinding> extends BaseActivity<BINDING> {
    protected ABinding binding;

    void init(){
        binding = (ABinding) DataBindingUtil.setContentView(this, R.layout.a);
    }
}

and pass the same binding to the child class from the submodule

class B<ABinding> {
    // you can use instance in this class
}