Android使用包含另一个散列表的散列表实现Parcelable对象 [英] Android implement Parcelable objects with hashmap that contains another hashmap

问题描述

这是 Android的实现Parcelable对象，它具有hashmap 但我的情况有点不同。

我有这些课程

 公共类EventDetails实现Parcelable {
私有字符串ID; 
私人字符串eventName; 
 Private Long eventUnixTime; 
私有HashMap< String，User> pickedUser = null; 
} 
  

和

  public class User实现Parcelable {
 private String email; 
 private String userName; 
 private String userPicture; 
私有布尔hasLoggedInWithPassword; 
私有HashMap< String，Object> dateJoined = null; 
 
 public User（）{
 
} 
 
 public User（String email，String userName，String userPicture，Boolean hasLoggedInWithPassword，HashMap< String，Object> ; dateJoined）{
 this.email = email; 
 this.userName = userName; 
 this.userPicture = userPicture; 
 this.hasLoggedInWithPassword = hasLoggedInWithPassword; 
 this.dateJoined = dateJoined; 
} 
 
保护用户（Parcel in）{
 email = in.readString（）; 
 userName = in.readString（）; 
 userPicture = in.readString（）; 
 
 int size = in.readInt（）; 
 for（int i = 0; i< size; i ++）{
 String key = in.readString（）; 
 Object value = in.readString（）; 
 dateJoined.put（key，value）; 
} 
} 
 
 public static final Creator< User> CREATOR = new Creator< User>（）{
 @Override 
 public User createFromParcel（Parcel in）{
 return new User（in）; 
} 
 
 @Override 
 public User [] newArray（int size）{
 return new User [size]; 
} 
}; 
 
 public String getEmail（）{
 return email; 
} 
 
 public String getUserName（）{
 return userName; 
} 
 
 public String getUserPicture（）{
 return userPicture; 
} 
 
 public Boolean getHasLoggedInWithPassword（）{
 return hasLoggedInWithPassword; 
} 
 
 public HashMap< String，Object> getDateJoined（）{
 return dateJoined; 
 
 $ b @Override 
 public int describeContents（）{
 Log.i（describeUser，描述来自User.java的内容）; 
 
返回0; 
 
 $ b @Override 
 public void writeToParcel（parcel dest，int flags）{
 
 Log.i（write to Parcel，write从User.java到Parcel）; 
 dest.writeString（email）; 
 dest.writeString（userName）; 
 dest.writeString（userPicture）; 
 dest.writeInt（hasLoggedInWithPassword？1：0）; 
 
 dest.writeInt（dateJoined.size（））; 
 for（HashMap.Entry< String，Object> entry：dateJoined.entrySet（））{
 dest.writeString（entry.getKey（））; 
 dest.writeString（String.valueOf（entry.getValue（）））; 
} 
} 
} 
  

EventDetails类中的方法：

  protected EventDetails（Parcel in）{
 id = in.readString（）; 
 eventName = in.readString（）; 
 eventUnixTime = in.readLong（）; 
 
 final int size = in.readInt（）; 
 for（int i = 0; i< size; i ++）{
 String key = in.readString（）; 
 User user = in.readHashMap（userMap）; 
 pickedFriendsHashMap.put（key，user）; 
 
 
 $ b @Override 
 public void writeToParcel（Parcel dest，int flags）{
 
 dest.writeInt（pickedFriendsHashMap.size （））; （HashMap.Entry< String，User> entry：pickedFriendsHashMap.entrySet（））{
 dest.writeString（entry.getKey（））; 
 
 
 
 dest.writeInt（listLength）; （用户用户：userList）{
 dest.writeParcelable（user，0）; 
 
 
} 
} 
 
 dest.writeString（id）; 
 dest.writeString（eventName）; 
 dest.writeLong（eventUnixTime）; 
} 
  

请告诉我如何正确地将这些类放入包裹并发送。

谢谢。

解决方案

Android studio已经提供了插件（Android Parcelable code generator）来生成 Parcelable 方法自动。

为了使用上面的插件，我创建了下面的类，使用 Parcelable 自动生成的方法

  public class EventDetails implements Parcelable {
 
 private String id; 
 private String eventName; 
私人长期eventUnixTime; 
私有HashMap< String，User> pickedUser; 
 
 
 @Override 
 public int describeContents（）{
 return 0; 
} 
 
 @Override 
 public void writeToParcel（Parcel dest，int flags）{
 dest.writeString（this.id）; 
 dest.writeString（this.eventName）; 
 dest.writeValue（this.eventUnixTime）; 
 dest.writeSerializable（this.pickedUser）; 
} 
 
 public EventDetails（）{
} 
 
 protected EventDetails（Parcel in）{
 this.id = in.readString（ ）; 
 this.eventName = in.readString（）; 
 this.eventUnixTime =（Long）in.readValue（Long.class.getClassLoader（））; 
 this.pickedUser =（HashMap< String，User>）in.readSerializable（）; 
} 
 
 public static final Creator&EventDetails> CREATOR = new Creator< EventDetails>（）{
 @Override 
 public EventDetails createFromParcel（Parcel source）{
 return new EventDetails（source）; 
} 
 
 @Override 
 public EventDetails [] newArray（int size）{
 return new EventDetails [size]; 
} 
}; 
} 
 
 public class User实现Parcelable {
 private String email; 
 private String userName; 
 private String userPicture; 
私有布尔hasLoggedInWithPassword; 
私有HashMap< String，Object> dateJoined = null; 
 $ b $ public User（String email，String userName，String userPicture，Boolean hasLoggedInWithPassword，HashMap< String，Object> dateJoined）{
 this.email = email; 
 this.userName = userName; 
 this.userPicture = userPicture; 
 this.hasLoggedInWithPassword = hasLoggedInWithPassword; 
 this.dateJoined = dateJoined; 
} 
 
 
 public String getEmail（）{
 return email; 
} 
 
 public String getUserName（）{
 return userName; 
} 
 
 public String getUserPicture（）{
 return userPicture; 
} 
 
 public Boolean getHasLoggedInWithPassword（）{
 return hasLoggedInWithPassword; 
} 
 
 public HashMap< String，Object> getDateJoined（）{
 return dateJoined; 
} 
 
 
 @Override 
 public int describeContents（）{
 return 0; 
} 
 
 @Override 
 public void writeToParcel（Parcel dest，int flags）{
 dest.writeString（this.email）; 
 dest.writeString（this.userName）; 
 dest.writeString（this.userPicture）; 
 dest.writeValue（this.hasLoggedInWithPassword）; 
 dest.writeSerializable（this.dateJoined）; 
} 
 
保护用户（Parcel in）{
 this.email = in.readString（）; 
 this.userName = in.readString（）; 
 this.userPicture = in.readString（）; 
 this.hasLoggedInWithPassword =（布尔值）in.readValue（Boolean.class.getClassLoader（））; 
 this.dateJoined =（HashMap< String，Object>）in.readSerializable（）; 
} 
 
 public static final Creator< User> CREATOR = new Creator< User>（）{
 @Override 
 public User createFromParcel（Parcel source）{
 return new User（source）; 
} 
 
 @Override 
 public User [] newArray（int size）{
 return new User [size]; 
} 
}; 
} 
  

This is an extension for Android implement Parcelable object which has hashmap but mine is a little different.

I have these classes

public class EventDetails implements Parcelable {
    Private String id;
    Private String eventName;
    Private Long eventUnixTime;
    Private HashMap <String, User> pickedUser = null;
}

and

public class User implements Parcelable {
    private String email;
    private String userName;
    private String userPicture;
    private Boolean hasLoggedInWithPassword;
    private HashMap<String, Object> dateJoined = null;

    public User() {

    }

    public User(String email, String userName, String userPicture, Boolean hasLoggedInWithPassword, HashMap<String, Object> dateJoined) {
        this.email = email;
        this.userName = userName;
        this.userPicture = userPicture;
        this.hasLoggedInWithPassword = hasLoggedInWithPassword;
        this.dateJoined = dateJoined;
    }

    protected User(Parcel in) {
        email = in.readString();
        userName = in.readString();
        userPicture = in.readString();

        int size = in.readInt();
        for (int i = 0; i < size; i++) {
            String key = in.readString();
            Object value = in.readString();
            dateJoined.put(key, value);
        }
    }

    public static final Creator<User> CREATOR = new Creator<User>() {
        @Override
        public User createFromParcel(Parcel in) {
            return new User(in);
        }

        @Override
        public User[] newArray(int size) {
            return new User[size];
        }
    };

    public String getEmail() {
        return email;
    }

    public String getUserName() {
        return userName;
    }

    public String getUserPicture() {
        return userPicture;
    }

    public Boolean getHasLoggedInWithPassword() {
        return hasLoggedInWithPassword;
    }

    public HashMap<String, Object> getDateJoined() {
        return dateJoined;
    }

    @Override
    public int describeContents() {
        Log.i("describeUser", "describe content from User.java");

        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {

        Log.i("write to Parcel", "write to Parcel from User.java");
        dest.writeString(email);
        dest.writeString(userName);
        dest.writeString(userPicture);
        dest.writeInt(hasLoggedInWithPassword ? 1:0);

        dest.writeInt(dateJoined.size());
        for (HashMap.Entry<String, Object> entry : dateJoined.entrySet()) {
            dest.writeString(entry.getKey());
            dest.writeString(String.valueOf(entry.getValue()));
        }
    }
}

I'm stuck in these methods in the EventDetails class:

protected EventDetails(Parcel in) {
    id = in.readString();
    eventName = in.readString();
    eventUnixTime = in.readLong();

    final int size = in.readInt();
    for (int i = 0; i < size; i++) {
        String key = in.readString();
        User user = in.readHashMap(userMap);
        pickedFriendsHashMap.put(key, user);
    }
}

 @Override
    public void writeToParcel(Parcel dest, int flags) {

        dest.writeInt(pickedFriendsHashMap.size());

        for (HashMap.Entry<String, User> entry :    pickedFriendsHashMap.entrySet()) {
            dest.writeString(entry.getKey());

        dest.writeInt(listLength);

        for (User user: userList) {
            dest.writeParcelable(user, 0);
        }
    }

    dest.writeString(id);
    dest.writeString(eventName);
    dest.writeLong(eventUnixTime);
}

Please advise how I can properly put these classes in parcels and send in bundle.

Thank you.

-R

解决方案

Android studio already provide plugin (Android Parcelable code generator) to generate Parcelable methods automatically.

For using above plugin i have create below classes with Parcelable auto generated methods

public class EventDetails implements Parcelable {

    private String id;
    private String eventName;
    private Long eventUnixTime;
    private HashMap<String, User> pickedUser;


    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(this.id);
        dest.writeString(this.eventName);
        dest.writeValue(this.eventUnixTime);
        dest.writeSerializable(this.pickedUser);
    }

    public EventDetails() {
    }

    protected EventDetails(Parcel in) {
        this.id = in.readString();
        this.eventName = in.readString();
        this.eventUnixTime = (Long) in.readValue(Long.class.getClassLoader());
        this.pickedUser = (HashMap<String, User>) in.readSerializable();
    }

    public static final Creator<EventDetails> CREATOR = new Creator<EventDetails>() {
        @Override
        public EventDetails createFromParcel(Parcel source) {
            return new EventDetails(source);
        }

        @Override
        public EventDetails[] newArray(int size) {
            return new EventDetails[size];
        }
    };
}

public class User implements Parcelable {
    private String email;
    private String userName;
    private String userPicture;
    private Boolean hasLoggedInWithPassword;
    private HashMap<String, Object> dateJoined = null;

    public User(String email, String userName, String userPicture, Boolean hasLoggedInWithPassword, HashMap<String, Object> dateJoined) {
        this.email = email;
        this.userName = userName;
        this.userPicture = userPicture;
        this.hasLoggedInWithPassword = hasLoggedInWithPassword;
        this.dateJoined = dateJoined;
    }


    public String getEmail() {
        return email;
    }

    public String getUserName() {
        return userName;
    }

    public String getUserPicture() {
        return userPicture;
    }

    public Boolean getHasLoggedInWithPassword() {
        return hasLoggedInWithPassword;
    }

    public HashMap<String, Object> getDateJoined() {
        return dateJoined;
    }


    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(this.email);
        dest.writeString(this.userName);
        dest.writeString(this.userPicture);
        dest.writeValue(this.hasLoggedInWithPassword);
        dest.writeSerializable(this.dateJoined);
    }

    protected User(Parcel in) {
        this.email = in.readString();
        this.userName = in.readString();
        this.userPicture = in.readString();
        this.hasLoggedInWithPassword = (Boolean) in.readValue(Boolean.class.getClassLoader());
        this.dateJoined = (HashMap<String, Object>) in.readSerializable();
    }

    public static final Creator<User> CREATOR = new Creator<User>() {
        @Override
        public User createFromParcel(Parcel source) {
            return new User(source);
        }

        @Override
        public User[] newArray(int size) {
            return new User[size];
        }
    };
}

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