当从另一个活动中打开片段时,需要恢复存储在HashMap<String, Marker> markers;
中的标记。HashMap存储和恢复从片段到另一活动的onSaveInstanceState
这是我的尝试:
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,当片段是从另一个活动暂停状态恢复的片段,以恢复标记。 例如:活动A包含片段FA从活动B被称为前景然后回再次按片段FA被打开:
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.
你能否让这个问题更准确? –
@NirDuan我想做类似Activity A(Fragment FA)的东西(地图上显示的标记,并且在调用Activity B时应该存储hashmap'onSaveInstanceState(Bundle outState)')---> Activity B --->(Back - 按下)在片段FA恢复'if(savedInstanceState!= null)'上再次恢复hashmap标记。 – Bhushan