Object[] Cannot Be Cast To Void[] In Asynctask

Question

I'm getting this error inside an extended asynctask, but i'm really sure that Object[] IS a Void[]. This is my custom AsyncTask: public abstract class RepeatableAsyncTask

Solution 1:

Solution found:

the problem was this:

AsyncTaskmAsyncTask=newListPalinasAsynkTask(callback);
....
mAsyncTask.execute();

I'm using generic AsyncTask to call execute, that class would pass Void as a parameter and will never call .execute() on ListPalinasAsynkTask, instead it will call ListPalinasAsynkTask.execute(Void). That gives the error.

Solutions:

Use ListPalinasAsynkTask instead of generic AsyncTask
Better one: Create a new class VoidRepeatableAsyncTask and make other Void AsyncTasks extend that one.

Like this:

publicabstractclassVoidRepeatableAsyncTask<T> extendsRepeatableAsyncTask<Void, Void, T> {
    publicvoidexecute() {
        super.execute();
    }
}

Then you can easily use something like this to call execute:

VoidRepeatableAsyncTaskmAsyncTask=newListPalinasAsynkTask(callback);
....
mAsyncTask.execute();

This will call the no-parameters execute method of AsyncTask.

Solution 2:

An alternative way with which I solved it is to pass Object in parameters, even if you don't use the parameters.

new AsyncTask<Object, Void, MergeAdapter>()

and the override:

Baca Juga

@OverrideprotectedReturnClassdoInBackground(Object... params) {
    //...
}

The above applies (in my case) if you want to pass different types of AsyncTasks to a method and of course you do not care about the parameters.

Solution 3:

The solution is much simpler as I see it. Just create the subclass object in this way:

AsyncTask<Void, Void, List<Palina> mAsyncTask = new ListPalinasAsynkTask(callback);
....
mAsyncTask.execute();

Solution 4:

Try using:

result = repeatInBackground((Void) inputs);

instead of

result = repeatInBackground(inputs);

Solution 5:

If this problem is occurring then you might have created a Derived class object and added its the base class variable (AsyncTask). So this error is occurring. AsyncTask mAsyncTask = new ListPalinasAsynkTask(callback);

Lint also gives a warning when you do like this "Unchecked call to execute. Params ...."

The solution is ListPalinasAsynkTask mAsyncTask = new ListPalinasAsynkTask(callback); Then call execute on it. It will work fine

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