CODEWITHSUNDEEP
android
RAAAAM
RAAAAM

Reputation: 3380

How to call method of another class in android

I have two different class(class A and Class B). i want to use the method of Class A in Class B. i normally used object for class A and called method in class B. but unfortunately i am getting Force close error. Is that any thing different to call a method of another class in android. I referred many articles in stackoverflow. but i cant understand properly. pls help me to find out the solution.

Upvotes: 0

Views: 22821

Answers (5)

ccheneson
ccheneson

Reputation: 49410

As I said in my comment, you shouldnt instantiate activities. If your method uses some method that are called from a Context object, you can create a new class ( Class NewClass) that accepts a context parameter and implements your methods in it.

So this way, you can call your class from any activity:

NewClass nc = new NewClass(this);

Look up for some example of how to use a database in Android. It uses the same way.

Upvotes: 0

user1892255
user1892255

Reputation: 21

earlier class A and class B both are extending Activity and now only A extends Activity and B extends A and now B can call functions of A this works for me:-

public class A extends Activity
{ 
  functionOfA(){}
}

public class B extends A
{
  //calling function of class A
  functionOfA();
}

Upvotes: 2

user960971
user960971

Reputation: 123

You should not create object like this, you should use context to call object like as below

           ((Class A) contextObject).function();

it runs perfectly on my system,

Upvotes: 4

Zoombie
Zoombie

Reputation: 3610

In case of Android, class which extends Activity will maintain its life cycle methods. if method which is defined in different class other current running activity may be killed or in pause state. so it is suggested that if method which is reusable in application should in different class for example (AppManager singleton class) rather than being in single activity class

Upvotes: 1

hotveryspicy new
hotveryspicy new

Reputation:

u have to create constructor of class A & in class B make an obj to class A initialize it with

ClassA obj=new classA();
obj.method_A();

hope this will help

Upvotes: 1

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