CODEWITHSUNDEEP
androidandroid-activity
Reza.Hoque
Reza.Hoque

Reputation: 2750

How to know the calling activity in Android

I have an activity which is called by a few other activities. For example, I have Activity1, Activity2, and Activity3. Activity1 calls Activity2 and passes a parameter. Activity3 also calls Activity2 and passes a parameter.

Now, based on the calling activity, Activity2 performs some task. How do I know which activity is calling Activity2?

Upvotes: 39

Views: 62210

Answers (8)

Amr
Amr

Reputation: 2280

Another solution, using companion object as in the following example:

class MainActivity: BaseActivity {
    ...
    LoginActivity.callerActivity = this
    it.context.startActivity(Intent(getActivity(), LoginActivity::class.java))
    ...
}

class LoginActivity : BaseActivity() {
    companion object {
        var callerActivity: AppCompatActivity? = null
    }

    ...

    callerActivity?.let {
        it.callSomething()
    }
}

Upvotes: 0

ahmad
ahmad

Reputation: 85

I'm Using This line 

    if (((((ActivityManager) getSystemService(Context.ACTIVITY_SERVICE)).getRunningTasks(1).get(0).baseActivity)).compareTo(new ComponentName(getPackageName()
                    , AnyActivityWantToCheck.class.getName())) == 0){
// do somthing .....
    }

i hope it work with you

Upvotes: 0

Zain Ali
Zain Ali

Reputation: 15973

If you start the activity with startActivityForResult(Intent, int), then you can get calling activity by getCallingActivity().getClassName().

Upvotes: 64

Udayan
Udayan

Reputation: 1374

A. If you can use startActivityForResult

As per Zain Ali's answer below: If you can start Activity with startActivityForResult() then you can get name of calling Activity class by this.getCallingActivity().getClassName();

B. If you can not use startActivityForResult

If you can not use startActivityForResult(), then you can use following method: You can pass additional parameter in intent, check the value in activity and act accordingly.

1) Define an interface or constants class to define integer constants to indicate calling activity

public interface ActivityConstants {
            public static final int ACTIVITY_1 = 1001;
            public static final int ACTIVITY_2 = 1002;
            public static final int ACTIVITY_3 = 1003;
}

2) Add extra parameter in intent while calling Activity2.

        Intent act2 = new Intent(context, Activity2.class);
                act2.putExtra("calling-activity", ActivityConstants.ACTIVITY_1);
    // or ActivityConstants.ACTIVITY_3 if called form Activity3
startActivity(act2);

3) Check the value of this extra parameter in Activity2 and act accordingly..

int callingActivity = getIntent().getIntExtra("calling-activity", 0);

        switch (callingActivity) {
        case ActivityConstants.ACTIVITY_1:
            // Activity2 is started from Activity1
            break;
        case ActivityConstants.ACTIVITY_3:
            // Activity2 is started from Activity3
            break;
        }

Upvotes: 42

Inzimam Tariq IT
Inzimam Tariq IT

Reputation: 6758

Pass anything(String/ int etc.) to putExtra and base on that do the your work like

Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
     intent.putExtra("PARENT_ACTIVITY_REF", "ParentActivityIsA");
     startActivity(intent);

And then receive in child like

String parentActivityRef = intent.getStringExtra("PARENT_ACTIVITY_REF");

then 

if (parentActivityRef.equals("ParentActivityIsA"){
              // do your work here
}else if ...{
             // ...
}else{
     //...
}

Upvotes: 0

Carlos
Carlos

Reputation: 1329

In your calling activity (FirstActivity):

Intent i = new Intent(FirstActivity.this, SecondActivity.class);
i.putExtra("classFrom", FirstActivity.class.toString());
startActivity(i);

And add the following code in the onCreate of the called activity (SecondActivity):

Bundle bundle = getIntent().getExtras();

if (bundle.getString("classFrom").equals(FirstActivity.class.toString())) {
     //Do some task
}

Notice that you should be carefully because the bundle object can't be null when you perform "b.getString("classFrom")".

Upvotes: 9

TrippinBilly
TrippinBilly

Reputation: 957

I successfully use: (Activity).getLocalClassName()

Upvotes: 0

dave.c
dave.c

Reputation: 10908

You could pass an additional parameter that specifies the calling Activity.

Upvotes: 2

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