Question

我创建Profile类，例如

@Entity
public class Profile {

    @ColumnInfo(name = "name")
    private String Name;

    @ColumnInfo(name = "location")
    private String location;

    @ColumnInfo(name = "type")
    private String type;

   GET SET value set hear.

    @Override
    public String toString() {
        return "\n{" +
                "pid=" + pid +
                ", Name='" + Name + '\'' +
                ", Location='" + location + '\'' +
                ", Type='" + type + '\'' +
                '}' + "\n";
    }
}

然后在我的Activity类中，我想通过Intent将这些数据共享到另一个Activity解析中。怎么可能？

IN活动课

    private List<Profile> profileList = new ArrayList<>();
    private ArrayList<String> data = new ArrayList<>();
    Profile profile = new Profile();
                    profile.setPid(new Random().nextInt());
                    profile.setName(mName);
                    profile.setLocation(mLocation);
                    profile.setType(mType);

                   data.all(profileList);

我的DAO课

@Dao
public interface ProfileDao {

    @Query("SELECT * FROM profile")
    List<Profile> getAll();

    @Query("SELECT * FROM profile WHERE pid IN (:userIds)")
    List<Profile> loadAllByIds(int[] userIds);

    @Insert
    void insertAll(Profile... profiles);

    @Delete
    void delete(Profile profile);

    @Update
    void update(Profile... profiles);
}

然后将profileList的相同数据保存在String中，然后将一个Activity发送到另一个Activity。预先感谢..！

Answer 1

使用putParcelableArrayListExtra代替putExtra

Intent mIntent = new Intent(FirstActivity.this, SecondActivity.class);
mIntent.putParcelableArrayListExtra("Data", mArraylist);
startActivity(mIntent);

OR

尝试如下使用gson

Gson gson = new Gson();

    String jsonprofileList  = gson.toJson(profileList );

    Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
    intent.putExtra("profile_list ", jsonprofileList  );
    startActivity(intent);

并像

一样接收

String profileListAsString = getIntent().getStringExtra("profile_list");

Gson gson = new Gson();
Type type = new TypeToken<List<modelClass>>(){}.getType();
List<modelClass> profileList = gson.fromJson(profileListAsString , type);

无法将表达式数据的类型从java.util.ArrayList <java.lang.string>转换为java.util.ArrayList <com.demo.profile>

1 个答案: