我有一个customClass对象，它有Uri，int和＆amp;其他customClass数据。我想使用GSON库保存共享参考中的Set。
final CustomClass obj1 = new CustomClass.Builder().mSourceUri(downloadUri)
.mDestinationURI(destinationUri)
.metaData(metaData1).build();
Set<CustomClass> set = new HashSet<CustomClass>();
set.add(obj1);
set.add(obj2);..etc
Gson gson = new Gson();
Type type = new TypeToken<Set<CustomClass>>() {}.getType();
String json = gson.toJson(set,type);
editor = sharedPreferences.edit();
editor.putString("ShareKey", json);
editor.commit();
但是gson.toJson（）没有返回任何东西＆amp;应用程序正在崩溃。 GC是连续调用的。我没有在我的应用程序中使用任何Generic类型。 当我尝试使用一些Student类数据的示例应用程序时，它工作正常。但是我的customClass对象总是失败请帮助解决这个问题。我复制了以下日志。
CustomObject类：
public class CustomObject implements Comparable<CustomObject> {
private int mDownloadState;
private int mDownloadId;
private Uri mUri;
private Uri mDestinationURI;
private RetryPolicy mRetryPolicy;
private CustomObjectMetaData metaData;
private boolean mCanceled = false;
private CustomObjectQueue mRequestQueue;
private DownloadStatusListener mDownloadListener;
private HashMap<String, String> mCustomHeader;
private enum Priority {
LOW,
NORMAL,
HIGH,
IMMEDIATE
}
private Priority mPriority = Priority.NORMAL;
public static class Builder {
private Uri mSourceUri;
private Uri mDestinationURI;
private CustomObjectMetaData metaData;
public Builder Builder () {
return this;
}
public Builder mSourceUri(Uri mUri) {
this.mSourceUri = mUri;
return this;
}
public Builder mDestinationURI(Uri mUri) {
this.mDestinationURI = mUri;
return this;
}
public Builder metaData(CustomObjectMetaData metaData) {
this.metaData = metaData;
return this;
}
public CustomObject build() {
return new CustomObject(this);
}
}
public CustomObject (Builder builder) {
this.mUri = builder.mSourceUri;
this.mDestinationURI = builder.mDestinationURI;
this.metaData = builder.metaData;
if (this.mUri == null) {
throw new NullPointerException();
}
String scheme = this.mUri.getScheme();
if (scheme == null || (!scheme.equals("http") && !scheme.equals("https"))) {
throw new IllegalArgumentException("Can only download HTTP/HTTPS URIs: " + mUri);
}
mCustomHeader = new HashMap<String, String>();
mDownloadState = iDownloadManager.STATUS_PENDING;
}
public CustomObject () {
}
private Priority getPriority() {
return mPriority;
}
private CustomObject setPriority(Priority priority) {
mPriority = priority;
return this;
}
public CustomObject addCustomHeader(String key, String value) {
mCustomHeader.put(key, value);
return this;
}
/**
* Associates this request with the given queue. The request queue will be notified when this
* request has finished.
*/
void setCustomObjectQueue(CustomObjectQueue downloadQueue) {
mRequestQueue = downloadQueue;
}
public RetryPolicy getRetryPolicy() {
return mRetryPolicy == null ? new DefaultRetryPolicy() : mRetryPolicy;
}
private CustomObject setRetryPolicy(RetryPolicy mRetryPolicy) {
this.mRetryPolicy = mRetryPolicy;
return this;
}
/**
* Sets the download Id of this request. Used by {@link CustomObjectQueue}.
*/
final void setDownloadId(int downloadId) {
mDownloadId = downloadId;
}
final int getDownloadId() {
return mDownloadId;
}
int getDownloadState() {
return mDownloadState;
}
void setDownloadState(int mDownloadState) {
//update meta with the state;
this.mDownloadState = mDownloadState;
getMetaData().setStatus(mDownloadState);
}
public CustomObjectMetaData getMetaData() {
return metaData == null ? new CustomObjectMetaData() : this.metaData;
}
public CustomObject setMetaData(CustomObjectMetaData metaInfo) {
this.metaData = metaInfo;
this.metaData.setSourceUri(this.getSourceUri());
this.metaData.setDestinationUri(this.getDestinationURI());
return this;
}
// public CustomObjectMetaData getMetaData() {
// return metaData;
// }
DownloadStatusListener getDownloadListener() {
return mDownloadListener;
}
public CustomObject setDownloadListener(DownloadStatusListener downloadListener) {
this.mDownloadListener = downloadListener;
return this;
}
public Uri getSourceUri() {
return mUri;
}
public CustomObject setSourceUri(Uri mUri) {
this.mUri = mUri;
return this;
}
public Uri getDestinationURI() {
return mDestinationURI;
}
public CustomObject setDestinationURI(Uri destinationURI) {
this.mDestinationURI = destinationURI;
return this;
}
//Package-private methods.
/**
* Mark this request as canceled. No callback will be delivered.
*/
public void cancel() {
mCanceled = true;
}
public void cancelDownLoad(int mDownloadId) {
mRequestQueue.cancel(mDownloadId);
}
/**
* Returns true if this request has been canceled.
*/
public boolean isCanceled() {
return mCanceled;
}
/**
* Returns all custom headers set by user
*
* @return
*/
HashMap<String, String> getCustomHeaders() {
return mCustomHeader;
}
void finish() {
mRequestQueue.finish(this);
}
@Override
public int compareTo(CustomObject other) {
Priority left = this.getPriority();
Priority right = other.getPriority();
// High-priority requests are "lesser" so they are sorted to the front.
// Equal priorities are sorted by sequence number to provide FIFO ordering.
return left == right ?
this.mDownloadId - other.mDownloadId :
right.ordinal() - left.ordinal();
}
}
Log :
Suspending all threads took: 191.070ms
09-21 12:43:04.827 4425-4440/com.mani.myApp.app W/art﹕ Suspending all threads took: 10.456ms
09-21 12:43:04.844 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 37651(1332KB) AllocSpace objects, 0(0B) LOS objects, 18% free, 6MB/7MB, paused 12.266ms total 49.456ms
09-21 12:43:05.029 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 69049(2MB) AllocSpace objects, 20(320KB) LOS objects, 37% free, 6MB/10MB, paused 9.733ms total 124.986ms
09-21 12:43:05.308 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 87448(2MB) AllocSpace objects, 61(976KB) LOS objects, 21% free, 7MB/9MB, paused 11.171ms total 66.163ms
09-21 12:43:05.445 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 45643(1402KB) AllocSpace objects, 32(512KB) LOS objects, 19% free, 7MB/9MB, paused 7.924ms total 50.964ms
09-21 12:43:05.666 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 79067(2MB) AllocSpace objects, 54(864KB) LOS objects, 34% free, 7MB/11MB, paused 10.303ms total 140.975ms
09-21 12:43:05.913 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 95791(2MB) AllocSpace objects, 60(960KB) LOS objects, 19% free, 8MB/10MB, paused 9.476ms total 59.863ms
09-21 12:43:06.057 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 48515(1430KB) AllocSpace objects, 31(496KB) LOS objects, 17% free, 8MB/10MB, paused 10.450ms total 56.711ms
09-21 12:43:06.291 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 88851(2MB) AllocSpace objects, 58(928KB) LOS objects, 32% free, 8MB/12MB, paused 10.302ms total 159.924ms
09-21 12:43:06.545 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 96048(2MB) AllocSpace objects, 61(976KB) LOS objects, 18% free, 8MB/10MB, paused 10.662ms total 64.854ms
09-21 12:43:06.697 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 47669(1412KB) AllocSpace objects, 31(496KB) LOS objects, 16% free, 9MB/10MB, paused 10.732ms total 62.647ms
09-21 12:43:06.916 4425-4440/com.mani.myApp.app W/art﹕ Suspending all threads took: 91.896ms
09-21 12:43:06.924 4425-4445/com.mani.myApp.app W/art﹕ Suspending all threads took: 7.190ms
09-21 12:43:06.940 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 59016(1610KB) AllocSpace objects, 32(512KB) LOS objects, 30% free, 9MB/13MB, paused 16.344ms total 167.829ms
09-21 12:43:07.211 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 96708(2MB) AllocSpace objects, 58(928KB) LOS objects, 17% free, 9MB/11MB, paused 10.546ms total 74.644ms
09-21 12:43:07.344 4425-4440/com.mani.myApp.app W/art﹕ Suspending all threads took: 12.374ms
09-21 12:43:07.352 4425-4445/com.mani.myApp.app W/art﹕ Suspending all threads took: 7.494ms
09-21 12:43:07.367 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 52606(1436KB) AllocSpace objects, 28(448KB) LOS objects, 16% free, 9MB/11MB, paused 16.669ms total 65.283ms
09-21 12:43:07.641 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 98017(2MB) AllocSpace objects, 60(960KB) LOS objects, 27% free, 10MB/14MB, paused 11.952ms total 187.184ms
09-21 12:43:07.924 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 104842(2MB) AllocSpace objects, 57(912KB) LOS objects, 15% free, 10MB/12MB, paused 11.145ms total 71.245ms
09-21 12:43:08.084 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 51645(1413KB) AllocSpace objects, 28(448KB) LOS objects, 14% free, 10MB/12MB, paused 11.965ms total 66.246ms
09-21 12:43:08.362 4425-4440/com.mani.myApp.app W/art﹕ Suspending all threads took: 32.383ms
09-21 12:43:08.371 4425-4445/com.mani.myApp.app W/art﹕ Suspending all threads took: 9.035ms
09-21 12:43:08.392 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 99862(2MB) AllocSpace objects, 57(952KB) LOS objects, 26% free, 11MB/15MB, paused 19.062ms total 219.195ms
09-21 12:43:08.651 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 94185(2MB) AllocSpace objects, 51(1020KB) LOS objects, 14% free, 11MB/13MB, paused 10.410ms total 70.971ms
09-21 12:43:08.805 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 47061(1378KB) AllocSpace objects, 25(500KB) LOS objects, 13% free, 11MB/13MB, paused 11.346ms total 63.690ms
09-21 12:43:09.120 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 106179(3MB) AllocSpace objects, 60(1196KB) LOS objects, 24% free, 12MB/16MB, paused 13.157ms total 220.810ms
09-21 12:43:09.363 4425-4440/com.mani.myApp.app W/art﹕ Suspending all threads took: 29.424ms
09-21 12:43:09.373 4425-4445/com.mani.myApp.app W/art﹕ Suspending all threads took: 9.951ms
09-21 12:43:09.394 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 93791(2MB) AllocSpace objects, 46(920KB) LOS objects, 13% free, 12MB/14MB, paused 20.565ms total 80.242ms
09-21 12:43:09.551 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 48697(1374KB) AllocSpace objects, 24(480KB) LOS objects, 12% free, 12MB/14MB, paused 13.081ms total 66.466ms
09-21 12:43:09.847 4425-4440/com.mani.myApp.app W/art﹕ Suspending all threads took: 13.442ms
09-21 12:43:09.858 4425-4445/com.mani.myApp.app W/art﹕ Suspending all threads took: 10.652ms
09-21 12:43:09.884 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 110673(3MB) AllocSpace objects, 59(1180KB) LOS objects, 23% free, 13MB/17MB, paused 23.900ms total 250.072ms
09-21 12:43:10.164 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 100923(2MB) AllocSpace objects, 49(980KB) LOS objects, 12% free, 13MB/15MB, paused 13.358ms total 78.789ms
09-21 12:43:10.333 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 50897(1411KB) AllocSpace objects, 24(480KB) LOS objects, 11% free, 14MB/15MB, paused 14.194ms total 73.668ms
09-21 12:43:10.688 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 123400(3MB) AllocSpace objects, 64(1280KB) LOS objects, 21% free, 14MB/18MB, paused 12.810ms total 258.849ms
09-21 12:43:10.990 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 105295(2MB) AllocSpace objects, 48(960KB) LOS objects, 11% free, 14MB/16MB, paused 13.258ms total 83.864ms
09-21 12:43:11.165 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 54353(1492KB) AllocSpace objects, 25(500KB) LOS objects, 10% free, 15MB/16MB, paused 12.175ms total 75.996ms
09-21 12:43:11.495 4425-4440/com.mani.myApp.app W/art﹕ Suspending all threads took: 155.495ms
09-21 12:43:11.506 4425-4445/com.mani.myApp.app W/art﹕ Suspending all threads took: 11.615ms
09-21 12:43:11.529 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 63385(1880KB) AllocSpace objects, 36(720KB) LOS objects, 20% free, 15MB/19MB, paused 24.605ms total 275.336ms
09-21 12:43:11.824 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 102216(2MB) AllocSpace objects, 47(940KB) LOS objects, 11% free, 15MB/17MB, paused 14.111ms total 81.338ms
09-21 12:43:12.000 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 51526(1402KB) AllocSpace objects, 23(460KB) LOS objects, 10% free, 15MB/17MB, paused 13.084ms total 74.463ms
09-21 12:43:12.374 4425-4440/com.mani.myApp.app W/art﹕ Suspending all threads took: 33.642ms
09-21 12:43:12.387 4425-4445/com.mani.myApp.app W/art﹕ Suspending all threads took: 13.049ms
09-21 12:43:12.415 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 132547(3MB) AllocSpace objects, 61(1220KB) LOS objects, 19% free, 16MB/20MB, paused 25.429ms total 318.358ms
09-21 12:43:12.722 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 107327(2MB) AllocSpace objects, 48(960KB) LOS objects, 10% free, 16MB/18MB, paused 15.514ms total 87.307ms
09-21 12:43:12.878 4425-4440/com.mani.myApp.app W/art﹕ Suspending all threads took: 36.380ms
09-21 12:43:12.891 4425-4445/com.mani.myApp.app W/art﹕ Suspending all threads took: 13.041ms
09-21 12:43:12.912 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 39227(1141KB) AllocSpace objects, 20(420KB) LOS objects, 10% free, 17MB/18MB, paused 26.421ms total 84.216ms
09-21 12:43:13.312 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 143804(3MB) AllocSpace objects, 62(1480KB) LOS objects, 18% free, 17MB/21MB, paused 15.782ms total 309.543ms
09-21 12:43:13.622 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 103652(2MB) AllocSpace objects, 43(1032KB) LOS objects, 9% free, 18MB/20MB, paused 13.240ms total 89.262ms
09-21 12:43:13.809 4425-4445/com.mani.myApp.app I/art﹕ Background sticky concurrent mark sweep GC freed 53375(1495KB) AllocSpace objects, 22(528KB) LOS objects, 8% free, 18MB/20MB, paused 15.340ms total 83.655ms
09-21 12:43:14.241 4425-4445/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep
09-21 12:34:09.987 28979-28994/com.mani.myApp.app W/art﹕ Suspending all threads took: 3.798s
09-21 12:34:10.175 28979-28999/com.mani.myApp.app W/art﹕ Suspending all threads took: 188.530ms
09-21 12:34:10.418 28979-28999/com.mani.myApp.app I/art﹕ Clamp target GC heap from 259MB to 256MB
09-21 12:34:10.418 28979-28999/com.mani.myApp.app I/art﹕ Background partial concurrent mark sweep GC freed 47(161KB) AllocSpace objects, 2(160KB) LOS objects, 0% free, 255MB/256MB, paused 237.084ms total 4.043s
09-21 12:34:10.419 28979-28979/com.mani.myApp.app I/art﹕ WaitForGcToComplete
答案 0 :(得分：0)
您的CustomObject中有许多复杂对象。如CustomObjectQueue，DownloadStatusListener等。我想这就是崩溃的原因。从您的CustomObject中删除复杂对象。希望这可以帮到你。