我发送一个TutorAccount数组作为另一个Activity的额外意图。以下是涉及的TutorAccount和Account类：
public class TutorAccount extends Account{
public TutorAccount(TutorProfile profile) {
super(profile);
}
public TutorAccount(TutorProfile profile, LocationInfo locationInfo) {
super(profile, locationInfo);
}
public TutorProfile getProfile() {
return (TutorProfile) super.getProfile();
}
public void setProfile(TutorProfile profile) {
super.setProfile(profile);
}
}
和帐户类
public class Account implements Parcelable {
/**Email Id of the User */
private String mEmailID;
/**Important to have the status indexed as this shall be used during a query for a particular user type*/
private Integer accountStatus;
// Profile info.
private GenericLearnerProfile profile;
// Tutor's location info. - this would be computed from {Latitude, Longitude} which shall be available
// from the _1 info. Also, this holds a reference to the LatLng{Latitude, Longitude} from the _1.
private LocationInfo locationInfo;
public Account(GenericLearnerProfile profile) {
if(profile == null){
throw new NullPointerException("Profile can't be null");
}
this.profile = profile;
mEmailID = profile.getEmailID();
// Auto boxing
this.accountStatus = profile.getCurrentStatus();
}
public Account(GenericLearnerProfile profile, LocationInfo locationInfo) {
if(profile == null){
throw new NullPointerException("Profile can't be null");
}
this.profile = profile;
this.locationInfo = locationInfo;
mEmailID = profile.getEmailID();
this.accountStatus = profile.getCurrentStatus();
}
private Account(){
}
public GenericLearnerProfile getProfile() {
return profile;
}
public void setProfile(GenericLearnerProfile profile) {
if(profile == null){
throw new NullPointerException("Profile can't be null");
}
this.profile = profile;
mEmailID = profile.getEmailID();
}
public LocationInfo getLocationInfo() {
return locationInfo;
}
public void setLocationInfo(LocationInfo locationInfo) {
this.locationInfo = locationInfo;
}
public static class LocationInfo implements Parcelable {
private String shortFormattedAddress;
public LocationInfo(String shortFormattedAddress) {
this.shortFormattedAddress = shortFormattedAddress;
}
public String getShortFormattedAddress() {
return shortFormattedAddress;
}
public void setShortFormattedAddress(String shortFormattedAddress) {
this.shortFormattedAddress = shortFormattedAddress;
}
protected LocationInfo(Parcel in) {
shortFormattedAddress = in.readString();
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(shortFormattedAddress);
}
@SuppressWarnings("unused")
public static final Parcelable.Creator<LocationInfo> CREATOR = new Parcelable.Creator<LocationInfo>() {
@Override
public LocationInfo createFromParcel(Parcel in) {
return new LocationInfo(in);
}
@Override
public LocationInfo[] newArray(int size) {
return new LocationInfo[size];
}
};
}
protected Account(Parcel in) {
mEmailID = in.readString();
accountStatus = in.readByte() == 0x00 ? null : in.readInt();
profile = (GenericLearnerProfile) in.readValue(GenericLearnerProfile.class.getClassLoader());
locationInfo = (LocationInfo) in.readValue(LocationInfo.class.getClassLoader());
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(mEmailID);
if (accountStatus == null) {
dest.writeByte((byte) (0x00));
} else {
dest.writeByte((byte) (0x01));
dest.writeInt(accountStatus);
}
dest.writeValue(profile);
dest.writeValue(locationInfo);
}
@SuppressWarnings("unused")
public static final Parcelable.Creator<Account> CREATOR = new Parcelable.Creator<Account>() {
@Override
public Account createFromParcel(Parcel in) {
return new Account(in);
}
@Override
public Account[] newArray(int size) {
return new Account[size];
}
};
}
您可以看到TutorAccount延伸Account。这是异常的堆栈跟踪：
java.lang.ClassCastException: com.learncity.generic.learner.account.Account cannot be cast to com.learncity.tutor.account.TutorAccount
at com.learncity.learner.search.SearchResultsActivity.onCreate(SearchResultsActivity.java:48)
at android.app.Activity.performCreate(Activity.java:6662)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
这是说帐户无法投放到TutorAccount。我不确定Account是如何投射出来的，因为它应该是Tutorlable to TutorAccount cast。
以下是用于发送和接收Intent extra的代码：
发送活动
// Show these accounts in a list view
Intent i = new Intent(this, SearchResultsActivity.class);
i.putExtra(SEARCHED_ACCOUNTS, refactorAccountsToArray(accounts));
startActivity(i);
接收活动
List<TutorAccount> list = new ArrayList<>(10);
for(Parcelable p : getIntent ().getParcelableArrayExtra(SEARCHED_ACCOUNTS)){
list.add((TutorAccount)p);
}
我尝试在接收活动中记录p - Parcelable，它显示它是Account的一个实例。我不确定这是怎么回事。有没有人遇到过这个？
修改
我在这里的参数中收到的List<TutorAccount> accounts是一个不同的类来模拟后端JSON数据。
以下是refactorAccountsToArray()方法：
private List<com.learncity.tutor.account.TutorAccount> refactorAccountsToList(List<TutorAccount> accounts){
// Extract the list of accounts from backend
List<TutorProfileVer1> profiles = new ArrayList<TutorProfileVer1>();
List<Account.LocationInfo> locationInfos = new ArrayList<Account.LocationInfo>();
for(TutorAccount acc : accounts){
profiles.add(acc.getProfile());
locationInfos.add(new Account.LocationInfo((acc.getLocationInfo() == null ? null: acc.getLocationInfo().getShortFormattedAddress())));
}
// Populate a profile model
List<com.learncity.tutor.account.TutorAccount> acc = new ArrayList<com.learncity.tutor.account.TutorAccount>();
List<TutorProfile> refactoredProfiles = TutorProfile.populateProfilesFromEntities(profiles);
int i = 0;
for(TutorProfile p : refactoredProfiles){
com.learncity.tutor.account.TutorAccount t = new com.learncity.tutor.account.TutorAccount(p);
t.setLocationInfo(new Account.LocationInfo(locationInfos.get(i).getShortFormattedAddress()));
acc.add(t);
i++;
}
return acc;
}
private com.learncity.tutor.account.TutorAccount[] refactorAccountsToArray(List<TutorAccount> accounts){
List<com.learncity.tutor.account.TutorAccount> refactoredProfiles = refactorAccountsToList(accounts);
return refactoredProfiles.toArray(new com.learncity.tutor.account.TutorAccount[refactoredProfiles.size()]);
}
答案 0 :(得分：0)
根据 @AnhaytAnanun 的建议结果表明，即使是演员，也需要一个Parcelable实体的创建者。我的代码现在可以使用CREATOR和其他Parcelable方法。以下是修订后的代码：
package com.learncity.tutor.account;
import android.os.Parcel;
import android.os.Parcelable;
import com.learncity.generic.learner.account.Account;
import com.learncity.tutor.account.profile.model.TutorProfile;
/**
* Created by DJ on 3/7/2017.
*/
public class TutorAccount extends Account{
public TutorAccount(TutorProfile profile) {
super(profile);
}
public TutorAccount(TutorProfile profile, LocationInfo locationInfo) {
super(profile, locationInfo);
}
public TutorProfile getProfile() {
return (TutorProfile) super.getProfile();
}
public void setProfile(TutorProfile profile) {
super.setProfile(profile);
}
public TutorAccount(Parcel in) {
super(in);
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
super.writeToParcel(dest, flags);
}
@SuppressWarnings("unused")
public static final Parcelable.Creator<TutorAccount> CREATOR = new Parcelable.Creator<TutorAccount>() {
@Override
public TutorAccount createFromParcel(Parcel in) {
return new TutorAccount(in);
}
@Override
public TutorAccount[] newArray(int size) {
return new TutorAccount[size];
}
};
}