我有一个包含片段的TabLayout，一个片段包含一个MapView，但每次带有MapView的片段都从背景返回时，在片段尝试创建MapView时会抛出错误;
My Fragment看起来像这样：
public class DinerFoodMapFragment extends Fragment {
private MapView mapView;
private GoogleMap map;
public DinerFoodMapFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.fragment_diner_food_map, container, false);
mapView = (MapView) view.findViewById(R.id.map_view);
mapView.onCreate(savedInstanceState);
return view;
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
try {
MapsInitializer.initialize(getActivity().getApplicationContext());
} catch (Exception e) {
e.printStackTrace();
}
mapView.getMapAsync(new OnMapReadyCallback() {
@Override
public void onMapReady(GoogleMap mMap) {
map = mMap;
CameraUpdate center =
CameraUpdateFactory.newLatLng(new LatLng(25.6714,
-100.309));
CameraUpdate zoom = CameraUpdateFactory.zoomTo(15);
map.moveCamera(center);
map.animateCamera(zoom);
}
});
}
@Override
public void onResume() {
super.onResume();
mapView.onResume();
}
@Override
public void onDestroy() {
super.onDestroy();
mapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
@Override
public void onPause() {
super.onPause();
mapView.onPause();
}
}
此行崩溃mapView.onCreate(savedInstanceState);
这是错误：
05-30 14:53:27.725 20916-20916/com.frevo.frevo E/Parcel: Class not found when unmarshalling: android.support.v7.widget.RecyclerView$SavedState
java.lang.ClassNotFoundException: android.support.v7.widget.RecyclerView$SavedState
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:324)
at android.os.Parcel.readParcelableCreator(Parcel.java:2404)
at android.os.Parcel.readParcelable(Parcel.java:2358)
at android.os.Parcel.readValue(Parcel.java:2264)
at android.os.Parcel.readSparseArrayInternal(Parcel.java:2675)
at android.os.Parcel.readSparseArray(Parcel.java:1967)
at android.os.Parcel.readValue(Parcel.java:2321)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2614)
at android.os.BaseBundle.unparcel(BaseBundle.java:221)
at android.os.Bundle.getBundle(Bundle.java:763)
at com.google.android.gms.maps.internal.ea.a(:com.google.android.gms.DynamiteModulesB:168)
at com.google.maps.api.android.lib6.impl.az.a(:com.google.android.gms.DynamiteModulesB:690)
at com.google.maps.api.android.lib6.impl.da.a(:com.google.android.gms.DynamiteModulesB:81)
at com.google.android.gms.maps.internal.z.onTransact(:com.google.android.gms.DynamiteModulesB:66)
at android.os.Binder.transact(Binder.java:387)
at com.google.android.gms.maps.internal.IMapViewDelegate$zza$zza.onCreate(Unknown Source)
at com.google.android.gms.maps.MapView$zza.onCreate(Unknown Source)
at com.google.android.gms.dynamic.zza$3.zzb(Unknown Source)
at com.google.android.gms.dynamic.zza$1.zza(Unknown Source)
at com.google.android.gms.maps.MapView$zzb.zzIL(Unknown Source)
at com.google.android.gms.maps.MapView$zzb.zza(Unknown Source)
at com.google.android.gms.dynamic.zza.zza(Unknown Source)
at com.google.android.gms.dynamic.zza.onCreate(Unknown Source)
at com.google.android.gms.maps.MapView.onCreate(Unknown Source)
at com.frevo.frevo.diner.fragments.food.DinerFoodMapFragment.onCreateView(DinerFoodMapFragment.java:83)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:2192)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1299)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:758)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2363)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2149)
at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2103)
at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1984)
at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:626)
at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:166)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1268)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:668)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:630)
at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:611)
at android.support.design.widget.TabLayout$ViewPagerOnTabSelectedListener.onTabSelected(TabLayout.java:2191)
at android.support.design.widget.TabLayout.dispatchTabSelected(TabLayout.java:1164)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1157)
at android.support.design.widget.TabLayout.selectTab(TabLayout.java:1127)
at android.support.design.widget.TabLayout$Tab.select(TabLayout.java:1426)
at android.support.design.widget.TabLayout$TabView.performClick(TabLayout.java:1536)
at android.view.View$PerformClick.run(View.java:21168)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
我的xml看起来像这样：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.frevo.frevo.diner.fragments.food.DinerFoodMapFragment">
<com.google.android.gms.maps.MapView
android:id="@+id/map_view"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<com.yarolegovich.discretescrollview.DiscreteScrollView
android:background="@drawable/shadow_gradient"
android:id="@+id/discrete_scroll"
android:layout_width="match_parent"
android:layout_height="100dp"
android:layout_alignParentBottom="true" />
</RelativeLayout>
答案 0 :(得分：0)
错误说，您需要在build.gradle中使用recycleler视图依赖项或删除recyclerview。 Android正试图给您的视图充气，但您没有依赖。
要使用recyclerview，您需要额外的依赖项是支持库的一部分。
compile 'com.android.support:recyclerview-v7:25.0.0'
更多信息：
https://developer.android.com/reference/android/support/v7/widget/RecyclerView.html
https://developer.android.com/training/material/lists-cards.html