How To Call Method In Activity Form Non Activity Class

I have an Activity and non Activity class. How to call a method in Activity class from non Activity class public class MainActivity extends Activity { public void onCreate(Bund

Solution 1:

Just create a callback interface inside the DateClass.

publicDateClass {
    publicinterface IDateCallback {
        voidcall(ArrayList<String> arr);
    }  

    private IDateCallback callerActivity;

    publicDateClass(Activity activity) {  
        callerActivity = (IDateCallback)activity;  
    }
...  
}  

publicvoidshow(ArrayList<String> array) {            
    callerActivity.Call(array);  
    ...  
}

//And implements it inside your activity.publicclassMainActivityextendsActivityimplements IDateCallback {  

    publicvoidcall(ArrayList<String> arr) {

    }  
}

Solution 2:

Well there are several things you could do. I think the easiest for you would be to send the Context into DataClass like so:

DataClassdc=newDataClass();
dc.show(this);

And in your DataClass save the context into a global var Context context. Then use it like so:

((MainActivity)context).call(array);

Solution 3:

((MainActivity)getContext).array();

Solution 4:

Just make a singleton like:

TeacherDashboardSingleton:

publicclassTeacherDashboardSingleton {
public  Teacher_Dashboard aa;
privatestaticfinalTeacherDashboardSingletonourInstance=newTeacherDashboardSingleton();
   publicstatic TeacherDashboardSingleton getInstance() {
        return ourInstance;
    }
}

myActivity class:

onCreate(....){
 ....
   TeacherDashboardSingleton.getInstance().aa = this;
....
}

this will create an object of same instance as in activity

now you can use it from anywhere