Getting current Activity name from base class

Question

How can I get the name of the current activity in the base class. Suppose I have a base activity class BaseActivity :

class BaseActivity extends AppCompatActivity
{
    ...
    String getCurrentActivityName() {
            ....
    }
    ...
}

Now I have 2 other classes

class Activity1 extends BaseActivity
{
    ....
}

class Activity2 extends BaseActivity
{
    ....
}

There maybe many more activities extending BaseActivity, for brevity I have used 2 here.

I am not sure how to implement getCurrentActivityName() method in the base class. It should return a String containing the name of the current activity.

EDIT : For some reasons I cannot edit Activity1 and Activity2.

@payloc this is useful when I am sure how many classes have extended the BaseActivity. But there is no fixed number. I will edit the question. — Utkarsh Srivastava, Mar 05 '18 at 09:40
@payloc but I dont have a instance in my case right? how can i use instanceOf or .getClass() ?? — Utkarsh Srivastava, Mar 05 '18 at 09:44
@UtkarshSrivastava found a way to do it that was missing in the question I previously marked as duplicate — payloc91, Mar 05 '18 at 10:06

score 1 · Accepted Answer · answered Mar 05 '18 at 09:47

1

When creating a new activity class you should add classname to the constructor and then get it with getCurrentActivityName method as you were trying

class BaseActivity extends AppCompatActivity
    {
        protected String className;
        public BaseActivity() { this.className = "BaseActivity"; }
        String getCurrentActivityName() {
              return this.className;
        }
        ...
    }

    class Activity1 extends BaseActivity
    {
        protected String className;
        public Activity1() { this.className = "Activity1"; }
    }

    class Activity2 extends BaseActivity
    {   
        protected String className;
        public Activity2() { this.className = "Activity2"; }

    }

Then if you call

BaseActivity baseActivity = new BaseActivity();
baseActivity.getClassname(); // returns "BaseActivity"
Activity1 activity1 = new Activity1();
activity1.getClassname(); // returns "Activity1"

Or if you just want to know the current activity name use . It's as simple as that

this.getClass().getSimpleName()

answered Mar 05 '18 at 09:47

Rainmaker

10,294
9
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Please see edit in the question. I cannot edit the classes Activity1 and Activity2 for some reasons. – Utkarsh Srivastava Mar 05 '18 at 09:51
then just use the last line of code in my answer and get the current activity showing or else you need to edit your children classes as i see it – Rainmaker Mar 05 '18 at 09:53
@payloc yes, i'm giving op two options including what you mentioned – Rainmaker Mar 05 '18 at 10:19
1+ for the latter – payloc91 Mar 05 '18 at 10:19
yepp, my bad... saw it at the last second – payloc91 Mar 05 '18 at 10:19
@payloc don't worry! appreciate +1 – Rainmaker Mar 05 '18 at 10:20

score 1 · Answer 2 · edited Mar 05 '18 at 10:44

1

Create abstract method getActivityName() in BaseActivity.

Implement getActivityName() in each activity and return Activity.this.getClass().getSimpleName();

Add this

String getCurrentActivityName() {
    return getActivityName();
}

edited Mar 05 '18 at 10:44

pfm

6,210
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answered Mar 05 '18 at 09:51

Vivek Pratap Singh

84
10

score 1 · Answer 3 · answered Mar 05 '18 at 09:57

Apparently this works fine, and I'm surprised the question I previously marked as already having an answer did not mention that within the accepted response.

abstract class A {
    public final String getName() {
         return this.getClass().getName();
    }
}

class B extends A { }

class C extends A { }

This prints the current class name of the implementing instance

public static void main(String[] args) {

    B b = new B();
    C c = new C();

    System.out.println(b.getName());
    System.out.println(c.getName());
}

Output:

com.test.B
com.test.C

You can adapt it to your use-case.

score 0 · Answer 4 · answered Mar 05 '18 at 09:54

public class BaseActivity extends AppCompatActivity {
    ActivityType currentActivityType;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    String getCurrentActivityName(){
        switch (this.currentActivityType){
            case type1:
                return "Activity 1";
            case type2:
                return "Activity 2";
                default:
                    return "Base Activity";
        }

    }
}

enum ActivityType{
    type1,
    type2
}

public class FirstActivity extends BaseActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        currentActivityType = ActivityType.type1;
    }
}

public class SecondActivity extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        currentActivityType = ActivityType.type2;
    }

}

Getting current Activity name from base class

4 Answers4

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