當從另一個活動中打開片段時,需要恢復存儲在HashMap<String, Marker> markers;
中的標記。HashMap存儲和恢復從片段到另一活動的onSaveInstanceState
這是我的嘗試:
HashMap<String, Marker> markers;
//..
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//..
this.markers = new HashMap<String, Marker>();
// Restoring the markers on configuration changes
if (savedInstanceState != null) {
if (savedInstanceState.containsKey("markers")) {
markers = (HashMap<String, Marker>) savedInstanceState.getSerializable("markers");
if (markers != null) {
for (String key : markers.keySet()) {
Location location =
new Location(markers.get(key).getPosition().latitude, markers.get(key).getPosition().longitude);
addMarker(key, location);
}
}
}
}
return rootView;
}
public void addMarker(String key, Location location) {
//if (!key.equals(strUserID)) {
Marker marker = this.mGoogleMap.addMarker(new MarkerOptions()
.position(new LatLng(location.latitude, location.longitude))
.icon(BitmapDescriptorFactory.defaultMarker()));
}
//...
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putSerializable("markers", markers);
}
我想,當片段是從另一個活動暫停狀態恢復的片段,以恢復標記。 例如:活動A包含片段FA從活動B被稱爲前景然後回再次按片段FA被打開:
Activity A (Fragment FA)(Markers shown on map and should store hashmap `onSaveInstanceState(Bundle outState)` when while activity B is called) ---> Activity B ---> (On Back-pressed restore markers from hashmap `if (savedInstanceState != null)`) Fragment FA.
你能否讓這個問題更準確? –
@NirDuan我想做類似Activity A(Fragment FA)的東西(地圖上顯示的標記,並且在調用Activity B時應該存儲hashmap'onSaveInstanceState(Bundle outState)')---> Activity B --->(Back - 按下)在片段FA恢復'if(savedInstanceState!= null)'上再次恢復hashmap標記。 – Bhushan