Cast field via reflection to array type in Java

Question

I want to get private field of array of TextView via reflection, but I need to cast this field back to the array.

Field f= FieldUtils.getDeclaredField(ContentAdapter.ViewHolder.class, "button_massive", true);

Explicit cast like this TextView[] f1 = ((TextView[]) f) don't work.

Thank you in advance!

What's the error when you try that cast? Is using reflection really necessary? I would prefer that as last resort. — Rohit Jain
– Rohit Jain, Commented Nov 22, 2015 at 15:58
Inconvertible types, it won't compile, I'm using reflection for testing, that's why it's necessary — Margarita Spasskaya
– Margarita Spasskaya, Commented Nov 22, 2015 at 16:13

Rohit Jain · Accepted Answer · 2015-11-22 16:24:59Z

1

You're directly typecasting the Field type to array. That certainly won't work. What you want is to get the value of f, using Field#get() method. And then typecast that result to Object[].

Field f= FieldUtils.getDeclaredField(ContentAdapter.ViewHolder.class, "button_massive", true);
Object[] result = (Object[]) f.get(obj);

If you really want TextView type array, then you've to create the array using and populate it from above Object[]:

TextView[] f1 = new TextView[result.length];
// Iterate over the `Object` array, and populate `f1` array.

I haven't tested this out, but it should be working.

answered Nov 22, 2015 at 16:24

Rohit Jain

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