Question

I’ve got two classes. Class1 and Class2 – Both extend Activity.

Class1 Launches on the program launch and when you click a button it’s meant to slide to Class2 – this works fine.

However Class2 has a TextView which I want to change the text of depending on which button is clicked – but I can’t for the life of me work out how to do it

I’m using startActivity(Class1.this,Class2.class); to slide across which obviously creates a new instances of Class2

I’ve also tried creating an instance of Class2 and then calling startActivity(Class1.this,myVar.getClass());

but the result is the same, any ideas how I call Class2.someMethod(); so that it effects the newly displayed Class2 instance? or am I going about this the wrong way?

Thanks in advance!

Answer 1

I’m using startActivity(Class1.this,Class2.class); to slide across which obviously creates a new instances of Class2

No, you are not, as that will not compile. You are probably using:

startActivity(new Intent(Class1.this,Class2.class));

I’ve also tried creating an instance of Class2 and then calling startActivity(Class1.this,myVar.getClass());

That won’t compile either. Here is the documentation for startActivity().

any ideas how I call Class2.someMethod(); so that it effects the newly displayed Class2 instance?

You don’t.

or am I going about this the wrong way?

If you want to pass data to the new Activity — and the data is simple, like you might put in parameters of a URL in a Web app — then package it as an Intent extra:

Intent i=new Intent(Class1.this,Class2.class));
i.putExtra("some key", "some value"); // there are many different types of data you can package
startActivity(i);

Then, in Class2, in onCreate(), you can call getIntent().getStringExtra("some key") to retrieve the data.