Question

我非常了解Realm是如何运作的。该示例具有两个模型类。一个叫做User，另一个叫做Task。因此每个用户都有相应的任务。

以下是两个模型类。

public class User extends RealmObject {

@PrimaryKey
private String id;
private String firstName;
private String lastName;
private Task task;
private RealmList<Task> tasks;


public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

public String getFirstName() {
    return firstName;
}

public void setFirstName(String firstName) {
    this.firstName = firstName;
}

public String getLastName() {
    return lastName;
}

public void setLastName(String lastName) {
    this.lastName = lastName;
}

public Task getTask() {
    return task;
}

public void setTask(Task task) {
    this.task = task;
}

public RealmList<Task> getTasks() {
    return tasks;
}

public void setTasks(RealmList<Task> tasks) {
    this.tasks = tasks;
}
}

和

public class Task implements RealmModel, Comparable<Task> {

@PrimaryKey
private String id;
private String title;
private String description;
private boolean isCompleted;

public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}

public String getDescription() {
    return description;
}

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

@Override
public int compareTo(Task another) {
    return 0;
}

public boolean isCompleted() {
    return isCompleted;
}

public void setCompleted(boolean completed) {
    isCompleted = completed;
  }
}

现在在我的主片段中，我试图将这些对象存储在我的数据库中。

public class MainFragment extends Fragment {

private static final String TAG = MainFragment.class.getSimpleName();

private Realm realm;

public MainFragment() {
}

public static MainFragment newInstance() {
    Bundle args = new Bundle();
    MainFragment fragment = new MainFragment();
    fragment.setArguments(args);
    return fragment;
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_main, container, false);
    return v;
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    realm = Realm.getDefaultInstance();

    realm.executeTransaction(new Realm.Transaction() {
        @Override
        public void execute(Realm realm) {
            // Only create a user if we don't have one.
            if (realm.where(User.class).count() == 0) {
                User u = realm.createObject(User.class);
                u.setFirstName("Theo");
                u.setLastName("Tziomakas");
                u.setId(UUID.randomUUID().toString());
            }
        }
    });
    realm.executeTransaction(new Realm.Transaction() {
        @Override
        public void execute(Realm realm) {
            User u = realm.where(User.class).findFirst();
            Task t = realm.createObject(Task.class);
            t.setTitle("Test Task");
            t.setDescription("Foo Bar");
            u.getTasks().add(t);
        }
    });

    User u = realm.where(User.class).findFirst();
    Log.d(TAG, u.getTask().getTitle());
}

@Override
public void onDestroy() {
    super.onDestroy();
    realm.close();
 }
}

我得到的回应是：

C:\Users\Theo\AndroidStudioProjects\ReamTutorial2\app\build\generated\source\apt\debug\io\realm\UserRealmProxy.java
  Error:(349, 66) error: cannot find symbol variable TaskRealmProxy
  Error:(183, 17) error: cannot find symbol variable TaskRealmProxy
  Error:(338, 65) error: cannot find symbol variable TaskRealmProxy
  Error:(187, 17) error: cannot find symbol variable TaskRealmProxy
  Error:(471, 75) error: cannot find symbol variable TaskRealmProxy
  Error:(400, 70) error: cannot find symbol variable TaskRealmProxy
  Error:(390, 69) error: cannot find symbol variable TaskRealmProxy

我正在使用1.2.0 Realm版本。

buildscript {
repositories {
    jcenter()
  }
dependencies {
    classpath 'com.android.tools.build:gradle:2.1.3'
    classpath "io.realm:realm-gradle-plugin:1.2.0"

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
  }
}

  allprojects {
   repositories {
    jcenter()
   }


  }

  task clean(type: Delete) {
    delete rootProject.buildDir
  }

任何想法可能出错？

谢谢，

西奥。

Answer 1

为了使注释处理器能够处理您的Realm模型类，您有两个选择：

1。）

public class Thing extends RealmObject {

2）。

@RealmClass
public class Thing implements RealmModel {

如果您查看RealmObject的来源，它也会这样开始：

@RealmClass
public abstract class RealmObject implements RealmModel {

对象未存储在我的Realm数据库中

1 个答案: