如何从AsyncTask扩展为通用基类？

AsyncTask 有三种不同的实现：

public class DownloadTask extends AsyncTask<String, Integer, Boolean>
public class JsonParserTask extends AsyncTask<Object, Void, Boolean>
public class PostCommentTask extends AsyncTask<String, Void, HttpRequestResult>

我希望他们扩展 BaseAsyncTask 然后我可以将其用于依赖项注入。 AsyncTask 的类签名如下：

I would like them to extend a BaseAsyncTask which I can use for dependency injection then. The class signatur of AsyncTask looks like this:

public abstract class AsyncTask<Params, Progress, Result>

我如何扩展 AsyncTask ，同时保持不同的参数？

How can I extend AsyncTask while maintaining the different parameters?

                               | DownloadTask
AsyncTask <-- BaseAsyncTask <--| JsonParserTask
                               | PostCommentTask