How to call a method in another activity

Question

I have a question about communication between activities on implementation program of Android.

Here is two activity classes.

public class HelloAndroi         


        

Answer 1

although you can do it by creating static method , but not right way because it will leave context . pass data to Tab1Activity you have in HelloAndroidActivity throgh intent . inside Tab1Activity getIntent and work accordingly .

you can also use onTabChange() to reflect changes between tabs .

Answer 2

You can pass data between activities using intent, you could put it in the extras with the intent:

HelloAndroidActivity

intent.putExtra("callX", true);

Tab1Activity

Bundle extras = getIntent().getExtras();
if (extras != null) {
    boolean callX = extras.getBoolean("callX");
    if(callX) {
       X();
    }
}

EDIT If you need to event/listener mechanism it could be roughly like this(haven't compiled this, but should give you an idea):

public inerface MyEventListener {
    abstract void handleMyEvent();
}

public class Tab1Activity implements MyEventListener {

    public void handleMyEvent() {
        /*...*/
    }

    protected void onCreate(Bundle savedInstanceState) {
         /*...*/
         HelloAndroidActivity.addListener(this);
    }

    protected void  onDestroy() {
         /*...*/
         HelloAndroidActivity.removeListener(this);
    }
}


public class HelloAndroidActivity {
    static ArrayList<MyEventListener> listeners = new ArrayList<MyEventListener>();
    public static void addListener(MyEventListener listener) {
        listeners.add(listener);
    }
    public static void removeListener(MyEventListener listener) {
        listeners.remove(m);
    }

    public static void onEvent() {
        for(MyEventListener m : listeners) {
            m.handleMyEvent();
        }
    }
}