Documenting the findings for future reference:
The following are code from android.support.v4.app.FragmentActivity
/**
* Modifies the standard behavior to allow results to be delivered to fragments.
* This imposes a restriction that requestCode be <= 0xffff.
*/
@Override
public void startActivityForResult(Intent intent, int requestCode) {
if (requestCode != -1 && (requestCode&0xffff0000) != 0) {
throw new IllegalArgumentException("Can only use lower 16 bits for requestCode");
}
super.startActivityForResult(intent, requestCode);
}
@Override
public final void validateRequestPermissionsRequestCode(int requestCode) {
// We use 16 bits of the request code to encode the fragment id when
// requesting permissions from a fragment. Hence, requestPermissions()
// should validate the code against that but we cannot override it as
// we can not then call super and also the ActivityCompat would call
// back to this override. To handle this we use dependency inversion
// where we are the validator of request codes when requesting
// permissions in ActivityCompat.
if (!mRequestedPermissionsFromFragment
&& requestCode != -1 && (requestCode & 0xffff0000) != 0) {
throw new IllegalArgumentException("Can only use lower 16 bits for requestCode");
}
}
RANGE
startActivityForResult() in FragmentActivity requires the requestCode to be of 16 bits, meaning the range is from 0 to 65535.
Also, validateRequestPermissionsRequestCode in FragmentActivity requires requestCode to be of 16 bits, meaning the range is from 0 to 65535.
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