Navigating through different activities in Android -

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hey people know how check if activity current activity has been opened from. small uncomplicated example:

i have 3 activities b c

and have textview in b

when open activity b a, want text view display hello when open in c goodbye.

if possible please assist

nb beginner in android in advance 

for b:  startactivity(new intent(a.this,b.class).putextra("value","hello"); in b.java values by: string value=getintent().getstringextra("value");  c b:  startactivity(new intent(c.this,b.class).putextra("value","goodbye"); in b.java values by: string value=getintent().getstringextra("value");

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