I don't understand how your activity gets the info about the Place (in your
case, the filter to apply).
If we think about the ActivityMapper as the one place that knows about both
the Place and the Activity and how to bind them together, then each
Activity should expose its own API and the ActivityMapper should then call
it. In your case, that could be:
// in the activity
public void setFilter(String filter) { ... }
// in the mapper
if (place instanceof CustomersListActivity) {
if (lastPlace instanceof CustomersListActivity) {
lastActivity = createSearchActivity(((CustomersListActivity)
place).getFilter());
} else {
((CustomersListActivity)
lastActivity).setFilter(((CustomersListActivity) place).getFilter());
}
} else {
// handle other places
}
// keep track of the last seen place
lastPlace = place;
return lastActivity;
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