我正在使用带有appengine和android的RequestFactory。它一直很好用，但是当我检索任何大小的对象列表（大约400个）时，它的响应非常延迟。似乎数据的传输发生得相当快（约4秒），但是直到很久以后（1-2分钟或更长时间）才进行onSuccess（）回调。我猜这可能是在requestfactory中解析的速度慢。我的对象只是POJO，包含大约10个字段和长文字。
我的问题是有没有人遇到这个？任何人都有更有效的方法从android中快速获取大量的数据？
更新：在使用大量实体（3000+）的RF时，我也遇到过错误。我使用GSON lib切换到直接json并且解析速度更快，并且还没有遇到内存问题。
我通过电汇发送的具体实体如下（我正在使用Objectify）。
@Cached
@Entity
public class InterestPoint
{
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private Long groupId;
private String more, data;
@Unindexed
private int lat, longi;
@Unindexed
private String address, city, state;
@Unindexed
private int num1, num2, num3;
@Unindexed
private int num4,num5,num6;
@Unindexed
private String name;
@Unindexed
private int moreData;
@Unindexed
private String notes;
}
答案 0 :(得分：2)
添加作者对问题的描述
我们正在检索8个相对较小的对象，每个对象都有一到四个很小的子对象：
以下是从服务器返回响应后的堆栈示例，超过一分钟它位于org.json包或com.google.web.bindery中，我们的CPU使用率很高：
java.lang.AbstractStringBuilder append0 AbstractStringBuilder.java 143 false
java.lang.StringBuilder append StringBuilder.java 125 false
org.json.JSONStringer string JSONStringer.java 344 false
org.json.JSONStringer value JSONStringer.java 252 false
org.json.JSONObject quote JSONObject.java 713 false
com.google.web.bindery.autobean.shared.impl.StringQuoter quote StringQuoter.java 69 false
com.google.web.bindery.autobean.shared.impl.StringQuoter create StringQuoter.java 50 false
com.google.web.bindery.autobean.shared.ValueCodex$Type$13 encode ValueCodex.java 193 false
com.google.web.bindery.autobean.shared.ValueCodex encode ValueCodex.java 315 false
com.google.web.bindery.autobean.shared.impl.AutoBeanCodexImpl$ValueCoder extractSplittable AutoBeanCodexImpl.java 500 false
com.google.web.bindery.autobean.shared.impl.AbstractAutoBean setProperty AbstractAutoBean.java 277 false
com.google.web.bindery.autobean.vm.impl.ProxyAutoBean setProperty ProxyAutoBean.java 253 false
com.google.web.bindery.autobean.vm.impl.BeanPropertyContext set BeanPropertyContext.java 44 false
com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext$3 visitValueProperty AbstractRequestContext.java 910 false
com.google.web.bindery.autobean.vm.impl.ProxyAutoBean traverseProperties ProxyAutoBean.java 289 false
com.google.web.bindery.autobean.shared.impl.AbstractAutoBean traverse AbstractAutoBean.java 166 false
com.google.web.bindery.autobean.shared.impl.AbstractAutoBean accept AbstractAutoBean.java 101 false
com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext processReturnOperation AbstractRequestContext.java 879 false
com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext processReturnOperations AbstractRequestContext.java 1215 false
com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext access$600 AbstractRequestContext.java 76 false
com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext$StandardPayloadDialect processPayload AbstractRequestContext.java 347 false
com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext$5 onTransportSuccess AbstractRequestContext.java 1108 false
com.whichfestival.AndroidRequestTransport send AndroidRequestTransport.java 68 false
com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext doFire AbstractRequestContext.java 1102 false
com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext fire AbstractRequestContext.java 569 false
com.google.web.bindery.requestfactory.shared.impl.AbstractRequest fire AbstractRequest.java 54 false
com.google.web.bindery.requestfactory.shared.impl.AbstractRequest fire AbstractRequest.java 59 false
com.whichfestival.FetchTopService getEvents FetchTopService.java 99 false
com.whichfestival.FetchTopService onHandleIntent FetchTopService.java 56 false
android.app.IntentService$ServiceHandler handleMessage IntentService.java 59 false
android.os.Handler dispatchMessage Handler.java 99 false
android.os.Looper loop Looper.java 130 false
android.os.HandlerThread run HandlerThread.java 60 false
我们看到GC开了大约25次：
11-16 22:30:28.464: D/dalvikvm(416): GC_CONCURRENT freed 930K, 51% free 3321K/6727K, external 1654K/2137K, paused 15ms+10ms
11-16 22:30:33.605: D/dalvikvm(416): GC_CONCURRENT freed 515K, 49% free 3452K/6727K, external 1654K/2137K, paused 10ms+13ms
11-16 22:30:37.554: D/dalvikvm(416): GC_CONCURRENT freed 638K, 49% free 3497K/6727K, external 1654K/2137K, paused 11ms+10ms
11-16 22:30:43.424: D/dalvikvm(416): GC_CONCURRENT freed 681K, 47% free 3572K/6727K, external 1654K/2137K, paused 6ms+9ms