Compare activity from getCallingActivity to another

Question

I would like to compare the calling activity to others to know which one called the current activity. I tried:

getCallingActivity().getClassName().toString().equals(MainActivity.class.toString())

It doesn't work, except by passing a value in the calling Intent, how can we compare classes using getCallingActivity() or getCallingPackage()?

Hey @HarinKaklotar you might want to check this out, I don't remember how I did it back in 2013 : http://www.programcreek.com/java-api-examples/index.php?class=android.app.Activity&method=getCallingActivity — Jerec TheSith, Aug 12 '16 at 08:55

score 9 · Accepted Answer · answered Apr 01 '16 at 06:40

9

You can compare the calling activity in the following manner if the activity is started for result from another activity.

  if (getCallingActivity().getClassName().equals(MainActivity.class.getName())) {

            /* here the main activity is calling activity*/

     }else{

             /*other activity is calling activity*/
  }

answered Apr 01 '16 at 06:40

Gopal Singh Sirvi

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hey i try this logic but it give me exaption like this: Attempt to invoke virtual method 'java.lang.String android.content.ComponentName.getClassName()' on a null object reference – Harin Kaklotar Aug 12 '16 at 07:28
1

did u started activity for result?? if not then `getCallingActivity()` will return null which will cause null pointer – Gopal Singh Sirvi Aug 12 '16 at 07:35
if (getCallingActivity().getClassName().equals(PlayerActivity.class.getCanonicalName())) code = 100; else { code = isPlaylist.equals("True") ? 100 : 200; } setResult(code, in); – Harin Kaklotar Aug 12 '16 at 07:36
use `getName()` instead of `getCanonicalName()` see the differences here http://stackoverflow.com/questions/15202997/what-is-the-difference-between-canonical-name-simple-name-and-class-name-in-jav – Gopal Singh Sirvi Aug 12 '16 at 07:38
try to log if `getCallingActivity` is not returning null – Gopal Singh Sirvi Aug 12 '16 at 07:42
it also give null :( – Harin Kaklotar Aug 12 '16 at 08:55
1

then the activity is not started for result. start it with `startActivityForResult` then everything will be fine – Gopal Singh Sirvi Aug 12 '16 at 09:32

Compare activity from getCallingActivity to another

1 Answers1