[英]Save state of StreetViewFragment when orientation changes
我正在嘗試將StreetViewPanorama的當前位置保存在StreetViewFragment中,因此例如,如果用戶最初是人像模式,並通過點擊箭頭並瀏覽該區域來更改StreetViewPanorama中的位置,然后切換到風景我想設置最后要恢復的位置,以便用戶可以繼續探索該區域。 當前,當我嘗試訪問“ streetViewPanorama.getLocation()”時,streetViewPanorama為Null,但這不是問題。 我認為我挽救國家的方式是不正確的,應該有更好的方法。 因此,我正在征求您的建議!
這是我的StreetViewFragment的代碼:
public class StreetViewFragment extends ViperFragment implements OnStreetViewPanoramaReadyCallback,
PropertyDetailsStreetView {
private static final String KEY_PROPERTY_ID = "property_id_street_view";
private static final String KEY_PROPERTY_LAT = "property_lat";
private static final String KEY_PROPERTY_LON = "property_lon";
private Bundle savedInstances;
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
streetViewPanoramaFragment = (StreetViewPanoramaFragment)
getActivity().getFragmentManager().findFragmentById(R.id.streetviewpanorama);
streetViewPanoramaFragment.getStreetViewPanoramaAsync(this);
savedInstances = savedInstanceState;
}
@Override
public void onSaveInstanceState(Bundle outState) {
outState.putDouble(KEY_PROPERTY_LAT, streetViewPanorama.getLocation().position.latitude);
outState.putDouble(KEY_PROPERTY_LON, streetViewPanorama.getLocation().position.longitude);
super.onSaveInstanceState(outState);
}
@Override
public void onStreetViewPanoramaReady(StreetViewPanorama streetViewPanorama) {
this.streetViewPanorama = streetViewPanorama;
presenter.onStreetViewPanoramaReady(getArguments().getLong(KEY_PROPERTY_ID));
if (savedInstances != null) {
this.streetViewPanorama.setPosition(
new LatLng(savedInstances.getLong(KEY_PROPERTY_LAT),
savedInstances.getLong(KEY_PROPERTY_LON)));
}
}
在進行更多修改之后,我提供了以下解決方案,該解決方案可以保存街景片段的當前位置狀態並進行還原。 效果不錯。
public class StreetViewFragment extends ViperFragment implements OnStreetViewPanoramaReadyCallback,
PropertyDetailsStreetView {
private static final String KEY_PROPERTY_ID = "property_id_street_view";
private static final String KEY_PROPERTY_LAT = "property_lat";
private static final String KEY_PROPERTY_LON = "property_lon";
private StreetViewPanoramaFragment streetViewPanoramaFragment;
private StreetViewPanorama streetViewPanorama;
private Bundle localBundle;
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
streetViewPanoramaFragment = (StreetViewPanoramaFragment)
getActivity().getFragmentManager().findFragmentById(R.id.streetviewpanorama);
streetViewPanoramaFragment.getStreetViewPanoramaAsync(this);
this.localBundle = savedInstanceState;
}
@Override
public void onSaveInstanceState(Bundle outState) {
if (streetViewPanoramaFragment != null) {
outState.putDouble(KEY_PROPERTY_LAT,
streetViewPanorama.getLocation().position.latitude);
outState.putDouble(KEY_PROPERTY_LON,
streetViewPanorama.getLocation().position.longitude);
}
super.onSaveInstanceState(outState);
}
@Override
public void onStreetViewPanoramaReady(StreetViewPanorama streetViewPanorama) {
this.streetViewPanorama = streetViewPanorama;
presenter.onStreetViewPanoramaReady(getArguments().getLong(KEY_PROPERTY_ID));
if (localBundle != null) {
this.streetViewPanorama.setPosition(
new LatLng(localBundle.getDouble(KEY_PROPERTY_LAT),
localBundle.getDouble(KEY_PROPERTY_LON)));
}
}
如果它擴展了Fragment類,那么使用setRetainInstance方法怎么辦? 它允許您保存設備旋轉時不會破壞片段的必要變量。 您可以從我的文章中了解有關此方法的用法: 在Android中使用和管理帶有片段的工具欄的簡單技巧
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