How to get the context lo launch a intent method from other class

Question

I'm trying to call a mehod from another activity. This method have a Intent inside and I'm sure that the problem is with the context in the intent. I read some similars answer but I can't do it... I get a nullpointerException

ActivityA

This is the method with the intent...

public void startGreetingRecorder() {
        Intent recordIntent = new Intent(this, NewActivity.class);
        .
        .
        startActivityForResult(recordIntent,);

    }

ActivityB

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int itemId = item.getItemId();
        if (itemId == R.id.menu_save) {

            ActivityA.startGreetingRecorder();

        }
        return true;
    }

This is that I'm trying to do but don't work.

ActivityA

This is the method with the intent...

public void startGreetingRecorder(Context context) {
        Intent recordIntent = new Intent(context, NewActivity.class);
        .
        .
        startActivityForResult(recordIntent,);

    }

ActivityB

protected Context context;

@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int itemId = item.getItemId();
        if (itemId == R.id.menu_save) {

            ActivityA.startGreetingRecorder(context);

        }
        return true;
    }

Answer 1

You are statically calling the method, so you need to mark the method as static as well as sending a context.

Activity A: (the receiver)

public static void startGreetingRecorder(final Activity a) {
  Intent recordIntent = new Intent(a, NewActivity.class);
        .
        .
  a.startActivityForResult(recordIntent,<SomeInteger>);

}

Activity B: (the caller)

[Edit] - Added the integer argument. This is used for handling the result.

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int itemId = item.getItemId();
    if (itemId == R.id.menu_save) {

        ActivityA.startGreetingRecorder(this);

    }
    return true;
}

If you don't actually need to handle the result, you can use context.startActivity(intent)

Answer 2

You can't call and activity method from other Activity in that way, you can use EventBus to achieve communication between activities.

Try with EventBus