How to combine Intent flags in Kotlin
Try something like following:
val intent = Intent(this, MapsActivity::class.java)
intent.flags = Intent.FLAG_ACTIVITY_CLEAR_TASK or Intent.FLAG_ACTIVITY_NEW_TASK
Explanation:
The operation that is applied to the flags is a bitwise or. In Java you have the |
operator for that.
As of bitwise operations [in Kotlin], there're no special characters for them, but just named functions that can be called in infix form.
Source
Here a list of all bitwise operations for Int
and Long
shl(bits)
– signed shift left (Java's<<
)shr(bits)
– signed shift right (Java's>>
)ushr(bits)
– unsigned shift right (Java's>>>
)and(bits)
– bitwise and (Java's&
)or(bits)
– bitwise or (Java's|
)xor(bits)
– bitwise xor (Java's^
)inv()
– bitwise inversion (Java's~
)
Solution:
So, in your case you only need to call or
in between your arguments like so.
intent.flags = Intent.FLAG_ACTIVITY_CLEAR_TASK or Intent.FLAG_ACTIVITY_NEW_TASK
Advanced, Reuseable Kotlin:
In Kotlin or
is the replacement for the Java bitwise or |
.
intent.flags = FLAG_ACTIVITY_NEW_TASK or FLAG_ACTIVITY_CLEAR_TASK
If you plan to use your combination regularly, create an Intent extension function
fun Intent.clearStack() {
flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
}
You can then directly call this function before starting the intent
intent.clearStack()
If you need the option to add additional flags in other situations, add an optional param to the extension function.
fun Intent.clearStack(additionalFlags: Int = 0) {
flags = additionalFlags or Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
}