How to find Intent source in Android? [duplicate]

Answer 1

If we look at the Intent.java class, we can see the members only included

private String mAction;
private Uri mData;
private String mType;
private String mPackage;
private ComponentName mComponent;
private int mFlags;
private HashSet<String> mCategories;
private Bundle mExtras;

I do not think any of these members include sender information, making the answer to the question no. You couldn't do this for an arbitrary intent.

Answer 2

A better way to do this would be to use Intent extras to pass parameters to the receiver.

Answer 3

If app C has the GET_TASKS permission, you can see what the most recent task was.

ActivityManager man = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
List<ActivityManager.RecentTaskInfo> list = man.getRecentTasks(1, 0);
//You might want to check if(list.size() > 0)

Intent caller = list.get(0).baseIntent;
//look at caller.getComponent() for the package and class

In my testing, I found that baseIntent on the top of the recent task stack was the most reliable identifier. There is more discussion about why you might not want to do this in https://stackoverflow.com/a/12376775/1135142

I suppose if you have any control over A and B, you could have them call for a result as mentioned already.

Answer 4

Might this be considered a workaround?

Have A & B call startActivityForResult instead of startActivity, then you can call getCallingActivity().getClassName() to retrieve the source.