我在寻找一种方法来存储我的应用程序创建的地理围栏时遇到问题，以便在我再次运行该应用程序时加载它们。目的是显示用户创建的地理围栏列表。
我尝试使用Java的序列化对它们进行序列化，也尝试使用Gson将它们转换为Json字符串。 Gson的问题是我尝试加载它们时，它给我一个错误消息，指出Geofence不是一个类。 （是的，这是一个接口）。
先感谢您。
PS：这是我班上的一些代码
public class Manager implements ResultCallback<Status>, LocationListener {
// Tag para fazer debug
protected static final String MAN = "Manager";
protected static final String SMS = "eventSMS";
protected static final String RING = "eventRing";
private Context mAppContext;
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
// Listas de Geofences
private TreeMap<String, Geofence> mGeofences;
private TreeMap<String, Event> mEvents;
private int mCounterActiveGeofences;
private PendingIntent mGeofencePendingIntent;
private Intent updateLocIntent;
/* Save */
private Gson gson;
private SharedPreferences prefs;
public Manager(Context context, GoogleApiClient googleApiClient){
mGeofences = new TreeMap<String, Geofence>();
mEvents = new TreeMap<String, Event>();
mGeofencePendingIntent = null;
mAppContext = context;
mGoogleApiClient = googleApiClient;
mCounterActiveGeofences = 0;
prefs = context.getSharedPreferences(Constants.Geofences, Context.MODE_PRIVATE);
gson = new Gson();
}
...
public void saveGeofences(){
String json;
Geofence geofence;
SharedPreferences.Editor editor = prefs.edit();
Log.d(MAN, "Saving Geofences...");
for (Map.Entry<String, Geofence> entry : mGeofences.entrySet()) {
geofence = mGeofences.get(entry.getKey());
json = gson.toJson(geofence);
editor.putString(geofence.getRequestId(), json);
Log.d(MAN, geofence.getRequestId() + " json: " + json);
}
editor.apply();
}
public void loadGeofences(){
Map<String, ?> keys = prefs.getAll();
Log.d(MAN, "Loading Geofences...");
for (Map.Entry<String, ?> entry : keys.entrySet()) {
String jsonString = prefs.getString(entry.getKey(), null);
Geofence geofence = gson.fromJson(jsonString, Geofence.class);
Log.d(MAN, geofence.getRequestId());
mGeofences.put(geofence.getRequestId(), geofence);
}
}
}
这是LogCat：
09-09 21:37:16.148 18137-18137/? D/dalvikvm﹕ Late-enabling CheckJNI
09-09 21:37:17.515 18137-18137/? I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.internal.widget.TintTypedArray.getChangingConfigurations
09-09 21:37:17.515 18137-18137/? W/dalvikvm﹕ VFY: unable to resolve virtual method 614: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
09-09 21:37:17.515 18137-18137/? D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
09-09 21:37:17.515 18137-18137/? I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.internal.widget.TintTypedArray.getType
09-09 21:37:17.515 18137-18137/? W/dalvikvm﹕ VFY: unable to resolve virtual method 636: Landroid/content/res/TypedArray;.getType (I)I
09-09 21:37:17.515 18137-18137/? D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
09-09 21:37:18.133 18137-18137/? D/GoogleAPIMsg﹕ Construcao do Client Google
09-09 21:37:18.164 18137-18137/? D/Manager﹕ Loading Geofences...
09-09 21:37:18.203 18137-18137/? D/AndroidRuntime﹕ Shutting down VM
09-09 21:37:18.203 18137-18137/? W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x419307c0)
09-09 21:37:18.234 18137-18137/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.smartlocation.wilcocsjrxxlxpto/com.smartlocation.wilcocsjrxxlxpto.HomeScreen}: java.lang.RuntimeException: Unable to invoke no-args constructor for interface com.google.android.gms.location.Geofence. Register an InstanceCreator with Gson for this type may fix this problem.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2339)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2389)
at android.app.ActivityThread.access$600(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5289)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.RuntimeException: Unable to invoke no-args constructor for interface com.google.android.gms.location.Geofence. Register an InstanceCreator with Gson for this type may fix this problem.
at com.google.gson.internal.ConstructorConstructor$12.construct(ConstructorConstructor.java:210)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:186)
at com.google.gson.Gson.fromJson(Gson.java:810)
at com.google.gson.Gson.fromJson(Gson.java:775)
at com.google.gson.Gson.fromJson(Gson.java:724)
at com.google.gson.Gson.fromJson(Gson.java:696)
at com.smartlocation.wilcocsjrxxlxpto.core.Manager.loadGeofences(Manager.java:203)
at com.smartlocation.wilcocsjrxxlxpto.HomeScreen.load(HomeScreen.java:252)
at com.smartlocation.wilcocsjrxxlxpto.HomeScreen.onCreate(HomeScreen.java:66)
at android.app.Activity.performCreate(Activity.java:5133)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2293)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2389)
at android.app.ActivityThread.access$600(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5289)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.google.gson.internal.UnsafeAllocator$1.newInstance(UnsafeAllocator.java:48)
at com.google.gson.internal.ConstructorConstructor$12.construct(ConstructorConstructor.java:207)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:186)
at com.google.gson.Gson.fromJson(Gson.java:810)
at com.google.gson.Gson.fromJson(Gson.java:775)
at com.google.gson.Gson.fromJson(Gson.java:724)
at com.google.gson.Gson.fromJson(Gson.java:696)
at com.smartlocation.wilcocsjrxxlxpto.core.Manager.loadGeofences(Manager.java:203)
at com.smartlocation.wilcocsjrxxlxpto.HomeScreen.load(HomeScreen.java:252)
at com.smartlocation.wilcocsjrxxlxpto.HomeScreen.onCreate(HomeScreen.java:66)
at android.app.Activity.performCreate(Activity.java:5133)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2293)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2389)
at android.app.ActivityThread.access$600(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5289)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.InstantiationException: can't instantiate class com.google.android.gms.location.Geofence; abstract class or interface
at sun.misc.Unsafe.allocateInstance(Native Method)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.google.gson.internal.UnsafeAllocator$1.newInstance(UnsafeAllocator.java:48)
at com.google.gson.internal.ConstructorConstructor$12.construct(ConstructorConstructor.java:207)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:186)
at com.google.gson.Gson.fromJson(Gson.java:810)
at com.google.gson.Gson.fromJson(Gson.java:775)
at com.google.gson.Gson.fromJson(Gson.java:724)
at com.google.gson.Gson.fromJson(Gson.java:696)
at com.smartlocation.wilcocsjrxxlxpto.core.Manager.loadGeofences(Manager.java:203)
at com.smartlocation.wilcocsjrxxlxpto.HomeScreen.load(HomeScreen.java:252)
at com.smartlocation.wilcocsjrxxlxpto.HomeScreen.onCreate(HomeScreen.java:66)
at android.app.Activity.performCreate(Activity.java:5133)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2293)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2389)
at android.app.ActivityThread.access$600(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1269)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5289)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
at dalvik.system.NativeStart.main(Native Method)
09-09 21:37:18.648 18137-18137/? I/Process﹕ Sending signal. PID: 18137 SIG: 9
该行Manager.java:203是“ Geofence geofence = gson.fromJson（jsonString，Geofence.class）;”从课堂上。
通过尝试序列化地理围栏而生成的json字符串是：
Json: {"zzDK":"xxd","zzCY":1,"zzazj":-1,"zzaxB":39.2079714,"zzaxC":-8.9593288,"zzaxD":100.0,"zzaxE":0,"zzaxF":-1,"zzaxy":3,"zzaxA":1}
最佳答案
您不能直接这样做。您必须自己镜像地理围栏设置（纬度，经度，半径等）。
关于java - 如何在磁盘中存储地理围栏？ (安卓)，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/32489043/