Convert a String to an Activity class

Question

I am trying to create an Activity class from a string and pass it to a static method. I found this on SO to pass a string into a class. FirstActivity is already created.

SecondActivity

String myClass = "com.package.FirstActivity";
Class<?> myClass = Class.forName(myClass);
//this works
//Intent myIntent = new Intent(getApplicationContext(), myClass);
//I want to pass to a static method, but it gives a error. Class cannot cast to Activity
StaticMethod.processThis(myClass , "test");

StaticMethod

public static void processThis(Activity contextActivity, String str) {
     //do processing
}

How can I get processThis to work? If I understand correctly, an Activity is also a class?

Exactly what is your problem? Do you want to solve a certain problem in your application or want to make work the above code? — Oybek, Oct 29 '11 at 20:13
I want to get my `processThis` method working. Made my question clearer. — newbie, Oct 29 '11 at 20:22
How do I cast? I tried `Activity newActivity = (Activity) myClass` — newbie, Oct 29 '11 at 20:25

score 10 · Accepted Answer · answered Oct 29 '11 at 20:26

10

You need to create a new instance of FirstActivity. If this class has a constructor with no-aruments you can do the following:

String myClass = "com.package.FirstActivity";
Class<?> myClass = Class.forName(myClass);
Activity obj = (Activity) myClass.newInstance();
Intent myIntent = new Intent(getApplicationContext(), myClass); //Maybe here also obj must be needed

//Noe pass your object here
StaticMethod.processThis(obj, "test");

answered Oct 29 '11 at 20:26

Ernesto Campohermoso

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Thanks! This was what I am looking for. I couldnt find a way to cast the class to activity. – newbie Oct 29 '11 at 20:36
But don't even think to change your structure afterwards :-/ – Isabelle Oct 03 '16 at 17:27

Convert a String to an Activity class

1 Answers1