[英]How to use constructor in Realm on Android
我想在Android中使用Realm
for Database ,并且我创建了provider class
以保存值但是当在主类( activity
)中使用此类构造函数时显示此错误,请参阅此图像中的错误 : 错误图像链接
Task_Provider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;
}
主要活动 (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? tnx all <3
编辑:构造函数确实工作并提供自Realm 2.0.0以来的默认值。
先前:
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;
}
这不起作用,因为Realm-Transformer在调用super()
之前无法执行RealmProxy的构造函数,所以正确的做法曾经是
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;
}
那你可以做
Task_Provider taskProvider = Task_Provider.create(...);
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