我有一个扩展SupportMapFragment的类,我从后端加载一些数据并显示标记.我还有另一个片段,我在地图上显示对应于所选标记的细节.我以纵向模式在地图下方显示细节片段,并在景观中并排显示.
public class MapDisplayFragment extends SupportMapFragment {
private ArrayList<ShowLocation> locations = null;
public void onViewCreated(View view,Bundle savedInstanceState) {
if (savedInstanceState != null) {
locations = (ArrayList<ShowLocation>)savedInstanceState.getSerializable("LOCATIONS");
}
}
@Override
public void onSaveInstanceState(Bundle outState) {
if (outState == null) {
outState = new Bundle();
}
outState.putSerializable("LOCATIONS",locations);
super.onSaveInstanceState(outState);
}
我有一个类实现Serializable,它在派生的地图类中使用.我使用onSaveInstanceState存储对象,以便我不必再次从后端检索数据.但应用程序崩溃与java.lang.RuntimeException：Parcelable遭遇ClassNotFoundException当我翻转设备时读取可序列化的对象.
public class ShowLocation implements Serializable {
private String geoCodeLat = Constants.EMPTY_STRING;
private String geoCodeLng = Constants.EMPTY_STRING;
....
public String getGeoCodeLat() {
return geoCodeLat;
}
public void setGeoCodeLat(String geoCodeLat) {
this.geoCodeLat = geoCodeLat;
}
public String getGeoCodeLng() {
return geoCodeLng;
}
public void setGeoCodeLng(String geoCodeLng) {
this.geoCodeLng = geoCodeLng;
}
....
}
我已经将布局定义如下：
<LinearLayout
android:id="@+id/layoutMapData"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<fragment
android:id="@+id/mapFrag"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.5"
class="com.test.appFragments.MapDisplayFragment" />
<LinearLayout
android:id="@+id/layoutDetails"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="0.5"
android:visibility="gone" >
</LinearLayout>
</LinearLayout>
如果有人遇到这个问题,或者如果有一个解决这个问题,请帮助我.
解决方法
不知道为什么会发生这种情况.看起来Google Play服务中的某个地方的数据正在解组,并且没有关于我们课程的信息.如我错了请纠正我.
但是,有一个解决方法.而不是将数据保存到outState中,将其保存到参数bundle(也被保存).这是一个例子：
public MyFragment extends SupportMapFragment {
private MapView mMapView;
public MyFragment() {
/*
* We need to set bundle here.
* Note,that if you're actually using arguments
* then skip line below.
*/
setArguments(new Bundle());
}
/* YOUR CODE HERE */
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mMapView.onSaveInstanceState(outState);
/* I'm using Serializable,but you can use whatever you want */
getArguments().putSerializable("yourfield",yourValue);
}
@Override
public void onCreate(Bundle savedState) {
super.onCreate(savedState);
mMapView.onCreate(savedState);
if(savedState != null) {
yourValue = getArguments.getSerializable("yourField");
}
}
}
