如何使用Gson序列化具有Context作为私有成员的自定义对象？

我有一个自定义对象的ArrayList，我试图使用Gson将其作为JSON字符串存储到磁盘。 这适用于我的对象，它只包含基本类型的数据，如字符串，但我有一个类有一个存储Activity的Context的私有成员。 当我尝试使用Gson序列化此类时，我得到以下exception：

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xxxx.xxxx/com.xxxx.xxxx.MainActivity}: java.lang.SecurityException: Can't make method constructor accessible at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) Caused by: java.lang.SecurityException: Can't make method constructor accessible at java.lang.reflect.Constructor.setAccessible(Constructor.java:336) at com.google.gson.internal.ConstructorConstructor.newDefaultConstructor(ConstructorConstructor.java:101) at com.google.gson.internal.ConstructorConstructor.get(ConstructorConstructor.java:83) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:96) at com.google.gson.Gson.getAdapter(Gson.java:407) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:136) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.access$100(ReflectiveTypeAdapterFactory.java:49) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.(ReflectiveTypeAdapterFactory.java:106) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:105) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:161) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:97) at com.google.gson.Gson.getAdapter(Gson.java:407) at com.google.gson.internal.bind.ArrayTypeAdapter$1.create(ArrayTypeAdapter.java:48) at com.google.gson.Gson.getAdapter(Gson.java:407) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:136) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.access$100(ReflectiveTypeAdapterFactory.java:49) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.(ReflectiveTypeAdapterFactory.java:106) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:105) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:161) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:97) at com.google.gson.Gson.getAdapter(Gson.java:407) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:136) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.access$100(ReflectiveTypeAdapterFactory.java:49) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.(ReflectiveTypeAdapterFactory.java:106) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:105) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:161) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:97) at com.google.gson.Gson.getAdapter(Gson.java:407) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:136) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.access$100(ReflectiveTypeAdapterFactory.java:49) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.(Refle 

我猜测问题是在Context内部有一个方法，Gson无法访问，因为它受到保护或类似的东西。 那么有没有一种方法可以使用Gson序列化包含其他复杂对象的对象？

这是一个会产生崩溃的简短代码片段：

 public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); MyObject myObject = new MyObject(this); Gson gson = new Gson(); String myObjectJson = gson.toJson(myObject); } public class MyObject { private Context context; public MyObject(Context context) { this.context = context; } } } 

Answer 1

Context不可序列化。 您应该将变量声明为transient以防止它被序列化。 当然，您应该在反序列化时手动分配它。

 public class MyObject { private transient Context context; // ... other fields here public MyObject() { } public void setContext(Context context) { this.context = context; } }