java - 如何在 Android 上的 Realm 中使用构造函数

Question

我想在 android 中为 Database 使用 Realm，我创建 provider class 来保存值，但是当在主类 (activity) 中使用此类 constructor 显示此错误，请查看此图片中的错误:Error image Link

任务提供者类:

public class Task_Provider extends RealmObject {

    public Task_Provider() {
    }

    public String getAddTask() {
        return addTask;
    }

    public void setAddTask(String addTask) {
        this.addTask = addTask;
    }

    public long getAdded_date() {
        return added_date;
    }

    public void setAdded_date(long added_date) {
        this.added_date = added_date;
    }

    public long getWhen_date() {
        return when_date;
    }

    public void setWhen_date(long when_date) {
        this.when_date = when_date;
    }

    public boolean isComplete() {
        return complete;
    }

    public void setComplete(boolean complete) {
        this.complete = complete;
    }

    public Task_Provider(String addTask, long added_date, long when_date, boolean complete) {
        this.addTask = addTask;
        this.added_date = added_date;
        this.when_date = when_date;
        this.complete = complete;
    }

    private String addTask;
    @PrimaryKey
    private long added_date;
    private long when_date;
    private boolean complete;

}

主要 Activity (按钮 setOnClickListener):

String addTask = dialog_edit_task.getText().toString();
long now = System.currentTimeMillis();
RealmConfiguration realmConfiguration = new RealmConfiguration.Builder(getActivity()).build();
Realm.setDefaultConfiguration(realmConfiguration);
Realm realm = Realm.getDefaultInstance();
Task_Provider task_provider = new Task_Provider(addTask, now, 0, false);

realm.beginTransaction();
realm.copyToRealm(task_provider);
realm.commitTransaction();
realm.close();

我该如何解决这个问题？全部发送 <3

Answer 1

编辑:自 Realm 2.0.0 以来，构造函数确实工作并提供默认值。

---

之前:

public Task_Provider(String addTask, long added_date, long when_date, boolean complete) {
    this.addTask = addTask;
    this.added_date = added_date;
    this.when_date = when_date;
    this.complete = complete;
}

这是行不通的，因为 Realm-Transformer 在调用 super() 之前无法执行 RealmProxy 的构造函数，所以过去正确的做法是

public Task_Provider() {
}


public static Task_Provider create(String addTask, long added_date, long when_date, boolean complete) {
    Task_Provider taskProvider = new Task_Provider();
    taskProvider.addTask = addTask;
    taskProvider.added_date = added_date;
    taskProvider.when_date = when_date;
    taskProvider.complete = complete;
    return taskProvider;
}

然后你可以做

Task_Provider taskProvider = Task_Provider.create(...);