Android - 将带有位图的对象保存到文件

Posted 2023-03-30

【中文标题】Android - 将带有位图的对象保存到文件

【英文标题】：Android - Save object with Bitmap to file

【发布时间】：2012-03-27 21:20:12

【问题描述】：

public class Challenge implements Comparable<Challenge>, Serializable 

private static final long serialVersionUID = 6970603871560357536L;
/* Strings to use for database and server communication */
public static final String CHALLENGE_ID = "cid"; 
public static final String NAME = "name";
public static final String DESCRIPTION = "description";
public static final String TYPE = "type";
public static final String START_DATE = "start_date";
public static final String END_DATE = "end_date";
public static final String GOAL = "goal";
public static final String GROUP_CHALLENGE = "group_challenge";
public static final String ACTIVITY_NAME = "activity_name";
public static final String STATUS = "status";
public static final String USER_POSITION = "user_position";
public static final String USER_VALUE = "user_value";
public static final String NUMBER_OF_PARTICIPANTS = "number_of_participants";
public static final String UNIT_NAME = "unit_name";
public static final String IMAGE_BASE64 = "image_base64";
public static final String USER_GROUPS = "user_groups";
public static final String USER_STATUS = "user_status";
public static final String HAS_MAP = "has_map";
public static final String MAP_ID = "map_id";

public static final int ACTION_ACCEPT = 1;
public static final int ACTION_CANCEL = 2;

public static final int STATUS_PENDING = 0;
public static final int STATUS_ACCEPTED = 1;
public static final int STATUS_DECLINED = 2;
public static final int STATUS_FINISHED = 3;
public static final int STATUS_NOT_FINISHED = 4;

public static final int CHALLENGE_STATUS_ACTIVE = 0;
public static final int CHALLENGE_STATUS_CANCELED = 1;
public static final int CHALLENGE_STATUS_FINISHED = 2;

public static final int CHALLENGE_TYPE_FIRST_TO_GOAL = 0;
public static final int CHALLENGE_TYPE_UNLIMITED_GOAL = 1;

/* Fields */
private int cid;
private String name;
private String description;
private int type;
private Date startDate;
private Date endDate;
private double goal;
private boolean groupChallenge;
private String acitivityName;
private int status;
private int userPosition;
private double userValue;
private int numberOfParticipants;
private String unitName;
private Bitmap image;
private int userStatus;
private boolean hasMap;
private int mapId;

private ArrayList<Group> userGroups;



/* Getters and setters */
public int getCid() 
    return cid;

public void setCid(int cid) 
    this.cid = cid;

public String getName() 
    return name;

public void setName(String name) 
    this.name = name;

public String getDescription() 
    return description;

public void setDescription(String description) 
    this.description = description;

public int getType() 
    return type;

public void setType(int type) 
    this.type = type;

public Date getStartDate() 
    return startDate;

public void setStartDate(Date startDate) 
    this.startDate = startDate;

public Date getEndDate() 
    return endDate;

public void setEndDate(Date endDate) 
    this.endDate = endDate;

public double getGoal() 
    return goal;

public void setGoal(double goal) 
    this.goal = goal;

public String getAcitivityName() 
    return acitivityName;

public void setAcitivityName(String acitivityName) 
    this.acitivityName = acitivityName;

public int getStatus() 
    return status;

public void setStatus(int status) 
    this.status = status;

public int getUserPosition() 
    return userPosition;

public void setUserPosition(int userPosition) 
    this.userPosition = userPosition;

public double getUserValue() 
    return userValue;

public void setUserValue(double userValue) 
    this.userValue = userValue;

public int getNumberOfParticipants() 
    return numberOfParticipants;

public void setNumberOfParticipants(int numberOfParticipants) 
    this.numberOfParticipants = numberOfParticipants;

public String getUnitName() 
    return unitName;

public void setUnitName(String unitName) 
    this.unitName = unitName;

public Bitmap getImage() 
    return image;

public void setImage(Bitmap image) 
    this.image = image;

这是我创建“挑战”模型的代码。所有挑战都有一个位图图像，现在我想将 ArrayList 保存到文件中以便在本地保存它们，这就是我保存它的方式：

public boolean saveOpenChallenges(List<Challenge> challenges) 
    FileOutputStream fos = null;
    ObjectOutputStream out = null;
    try 
        File new_file = new File(context.getFilesDir(), CHALLENGES_FILE_NAME);
        new_file.createNewFile();
        fos = new FileOutputStream(new_file);
        out = new ObjectOutputStream(fos);
        out.writeObject(challenges);
        out.close();
        Log.d("daim", "saving challenges to file!");
        return true;
     catch (Exception e) 
        Log.e("bajs", "" + e.getMessage());
        return false;
     finally 
        close(fos);
               

这将抛出一个异常，告诉我位图不可序列化之类的，我如何才能在打开位图的情况下保存这些对象？ 非常感谢您的回答，谢谢:)

【问题讨论】：

您遇到了什么异常？你能在这里发布一些错误日志吗...

没关系，我只是将位图保存到 SD 卡 :)

【参考方案1】：

我只是将图像保存到 SD 卡中。