gson.fromJson()中的内存不足异常 [英] Out of memory exception in gson.fromJson()
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问题描述
我使用以下代码将Json字符串(strWebserviceResult)转换为我的对象:
EntMyClass entMyClass = gson.fromJson(strWebserviceResult,EntMyClass.class);
当 strWebserviceResult 很大(大约2.5 MB)时，我在这行上的 Out of memory (内存不足)异常在不是具有更大内存的Tablet的Android手机设备上显示. >
我该如何解决.
有人有什么建议吗?
05-26 15:52:49.607: E/dalvikvm-heap(2078): Out of memory on a 9200-byte allocation.
05-26 15:52:49.618: E/dalvikvm(2078): Out of memory: Heap Size=31879KB, Allocated=27693KB, Bitmap Size=936KB, Limit=32768KB
05-26 15:52:49.618: E/dalvikvm(2078): Extra info: Footprint=31879KB, Allowed Footprint=31879KB, Trimmed=7400KB
05-26 15:52:49.618: E/AndroidRuntime(2078): FATAL EXCEPTION: Thread-19
05-26 15:52:49.618: E/AndroidRuntime(2078): java.lang.OutOfMemoryError: (Heap Size=31879KB, Allocated=27693KB, Bitmap Size=936KB)
05-26 15:52:49.618: E/AndroidRuntime(2078): at java.util.ArrayList.add(ArrayList.java:123)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter.deserialize(DefaultTypeAdapters.java:664)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter.deserialize(DefaultTypeAdapters.java:624)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java:51)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationVisitor.invokeCustomDeserializer(JsonDeserializationVisitor.java:92)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonObjectDeserializationVisitor.visitFieldUsingCustomHandler(JsonObjectDeserializationVisitor.java:117)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.ReflectingFieldNavigator.visitFieldsReflectively(ReflectingFieldNavigator.java:63)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:120)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationContextDefault.fromJsonObject(JsonDeserializationContextDefault.java:76)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:54)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter.deserialize(DefaultTypeAdapters.java:663)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter.deserialize(DefaultTypeAdapters.java:624)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java:51)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationVisitor.invokeCustomDeserializer(JsonDeserializationVisitor.java:92)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationVisitor.visitUsingCustomHandler(JsonDeserializationVisitor.java:80)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:101)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationContextDefault.fromJsonArray(JsonDeserializationContextDefault.java:67)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:52)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.Gson.fromJson(Gson.java:551)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.Gson.fromJson(Gson.java:498)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.Gson.fromJson(Gson.java:467)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.Gson.fromJson(Gson.java:417)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.Gson.fromJson(Gson.java:389)
05-26 15:52:49.618: E/AndroidRuntime(2078): at org.mabna.order.businessLayer.BoWebService.getDataForUpdate(BoWebService.java:188)
05-26 15:52:49.618: E/AndroidRuntime(2078): at org.mabna.order.ui.ActToolDataExchange.threadGetDataForFullUpdate(ActToolDataExchange.java:371)
05-26 15:52:49.618: E/AndroidRuntime(2078): at org.mabna.order.ui.ActToolDataExchange.access$9(ActToolDataExchange.java:362)
05-26 15:52:49.618: E/AndroidRuntime(2078): at org.mabna.order.ui.ActToolDataExchange$33.run(ActToolDataExchange.java:603)
05-26 15:52:49.618: E/AndroidRuntime(2078): at org.mabna.order.utils.Utilities$5.run(Utilities.java:778)
解决方案
与其他文章一样，我会问是否有任何方法可以避免应用程序占用大量内存.如果可以的话，它将是最佳的解决方案.如果您的应用程序确实需要那么多内存，则可以尝试在清单中为您的应用程序设置android:largeHeap="true".这是参考:
http://developer.android.com/reference/android/R.styleable.html#AndroidManifestApplication_largeHeap
有关更多信息，请参见此视频:
http://www.youtube.com/watch?v=_CruQY55HOk
I use the following code for converting Json string(strWebserviceResult) to my Object:
EntMyClass entMyClass = gson.fromJson(strWebserviceResult,EntMyClass.class);
When strWebserviceResult is large (about 2.5 MB) I get the Out of memory exception on this line on Android phone devices not in Tablet that has larger memory.
How can I solve that.
Does anybody have any suggestion?
05-26 15:52:49.607: E/dalvikvm-heap(2078): Out of memory on a 9200-byte allocation.
05-26 15:52:49.618: E/dalvikvm(2078): Out of memory: Heap Size=31879KB, Allocated=27693KB, Bitmap Size=936KB, Limit=32768KB
05-26 15:52:49.618: E/dalvikvm(2078): Extra info: Footprint=31879KB, Allowed Footprint=31879KB, Trimmed=7400KB
05-26 15:52:49.618: E/AndroidRuntime(2078): FATAL EXCEPTION: Thread-19
05-26 15:52:49.618: E/AndroidRuntime(2078): java.lang.OutOfMemoryError: (Heap Size=31879KB, Allocated=27693KB, Bitmap Size=936KB)
05-26 15:52:49.618: E/AndroidRuntime(2078): at java.util.ArrayList.add(ArrayList.java:123)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter.deserialize(DefaultTypeAdapters.java:664)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter.deserialize(DefaultTypeAdapters.java:624)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java:51)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationVisitor.invokeCustomDeserializer(JsonDeserializationVisitor.java:92)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonObjectDeserializationVisitor.visitFieldUsingCustomHandler(JsonObjectDeserializationVisitor.java:117)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.ReflectingFieldNavigator.visitFieldsReflectively(ReflectingFieldNavigator.java:63)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:120)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationContextDefault.fromJsonObject(JsonDeserializationContextDefault.java:76)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:54)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter.deserialize(DefaultTypeAdapters.java:663)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.DefaultTypeAdapters$CollectionTypeAdapter.deserialize(DefaultTypeAdapters.java:624)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java:51)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationVisitor.invokeCustomDeserializer(JsonDeserializationVisitor.java:92)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationVisitor.visitUsingCustomHandler(JsonDeserializationVisitor.java:80)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:101)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationContextDefault.fromJsonArray(JsonDeserializationContextDefault.java:67)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:52)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.Gson.fromJson(Gson.java:551)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.Gson.fromJson(Gson.java:498)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.Gson.fromJson(Gson.java:467)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.Gson.fromJson(Gson.java:417)
05-26 15:52:49.618: E/AndroidRuntime(2078): at com.google.gson.Gson.fromJson(Gson.java:389)
05-26 15:52:49.618: E/AndroidRuntime(2078): at org.mabna.order.businessLayer.BoWebService.getDataForUpdate(BoWebService.java:188)
05-26 15:52:49.618: E/AndroidRuntime(2078): at org.mabna.order.ui.ActToolDataExchange.threadGetDataForFullUpdate(ActToolDataExchange.java:371)
05-26 15:52:49.618: E/AndroidRuntime(2078): at org.mabna.order.ui.ActToolDataExchange.access$9(ActToolDataExchange.java:362)
05-26 15:52:49.618: E/AndroidRuntime(2078): at org.mabna.order.ui.ActToolDataExchange$33.run(ActToolDataExchange.java:603)
05-26 15:52:49.618: E/AndroidRuntime(2078): at org.mabna.order.utils.Utilities$5.run(Utilities.java:778)
解决方案
As with the other post, I would ask whether there is any way to avoid large memory usage with your app. If you can do that, it will be the most optimal solution. If your app really needs that much memory, you can try setting android:largeHeap="true" for your application in the manifest. Here is the reference:
http://developer.android.com/reference/android/R.styleable.html#AndroidManifestApplication_largeHeap
See this video for more information:
http://www.youtube.com/watch?v=_CruQY55HOk
这篇关于gson.fromJson()中的内存不足异常的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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