运行稍微修改过的google maps示例会在google maps代码中抛出BadParcelableException
。LatLng
类是Parcelable,但找不到它。谷歌地图代码似乎在试图解开未被它包裹的物体。问题出在什么情况下?
package com.example.mapdemo;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import android.os.Bundle;
public class RawMapViewDemoActivity extends android.support.v4.app.FragmentActivity {
private MapView mMapView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.raw_mapview_demo);
mMapView = (MapView) findViewById(R.id.map);
mMapView.onCreate(savedInstanceState);
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mMapView.onSaveInstanceState(outState);
outState.putParcelable("marker", new LatLng(0, 0));
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
LatLng ll = savedInstanceState.getParcelable("marker");
}
}
…
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.example.mapdemo/com.example.mapdemo.RawMapViewDemoActivity}:
android.os.BadParcelableException: ClassNotFoundException when unmarshalling:
com.google.android.gms.maps.model.LatLng
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:2832)
at android.app.ActivityThread.access$1600(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.os.BadParcelableException:
ClassNotFoundException when unmarshalling: com.google.android.gms.maps.model.LatLng
at android.os.Parcel.readParcelable(Parcel.java:1958)
at android.os.Parcel.readValue(Parcel.java:1846)
at android.os.Parcel.readMapInternal(Parcel.java:2083)
at android.os.Bundle.unparcel(Bundle.java:208)
at android.os.Bundle.getBundle(Bundle.java:1078)
at com.google.android.gms.maps.internal.MapStateHelper
.getParcelableFromMapStateBundle(MapStateHelper.java:41)
at maps.y.ae.a(Unknown Source)
at maps.y.bm.onCreate(Unknown Source)
at com.google.android.gms.maps.internal.IMapViewDelegate$Stub
.onTransact(IMapViewDelegate.java:66)
at android.os.Binder.transact(Binder.java:279)
at com.google.android.gms.maps.internal.IMapViewDelegate$a$a
.onCreate(Unknown Source)
at com.google.android.gms.maps.MapView$b.onCreate(Unknown Source)
at com.google.android.gms.internal.c$3.a(Unknown Source)
at com.google.android.gms.internal.i.b(Unknown Source)
at com.google.android.gms.maps.MapView$a.a(Unknown Source)
at com.google.android.gms.maps.MapView$a.a(Unknown Source)
at com.google.android.gms.internal.c.a(Unknown Source)
at com.google.android.gms.internal.c.onCreate(Unknown Source)
at com.google.android.gms.maps.MapView.onCreate(Unknown Source)
at com.example.mapdemo.RawMapViewDemoActivity
.onCreate(RawMapViewDemoActivity.java:40)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
... 12 more
最佳答案
为了增加现有的答案,我在调用mapView.onCreate
之前已经从保存的状态中删除了我的包裹,它工作正常。
然而,在我的片段中添加了一个ViewPager
之后,我没有意识到BadParcelableException
已经返回,代码使它投入生产。结果发现,ViewPager
也保存了它的状态,因为它是支持库的一部分,所以google map找不到要取消对它的分析的类。
因此,我选择反转这个过程,而不是从我所知道的包中删除包裹,而是创建一个新的包,以便仅在地图的状态下进行地图复制。
private final static String BUNDLE_KEY_MAP_STATE = "mapData";
@Override
public void onSaveInstanceState(Bundle outState) {
// Save the map state to it's own bundle
Bundle mapState = new Bundle();
mapView.onSaveInstanceState(mapState);
// Put the map bundle in the main outState
outState.putBundle(BUNDLE_KEY_MAP_STATE, mapState);
super.onSaveInstanceState(outState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_map, container, false);
mapView = (MapView) view.findViewById(R.id.mapView);
mapView.getMapAsync(this);
Bundle mapState = null;
if (savedInstanceState != null) {
// Load the map state bundle from the main savedInstanceState
mapState = savedInstanceState.getBundle(BUNDLE_KEY_MAP_STATE);
}
mapView.onCreate(mapState);
return view;
}