Question

我收到一个错误：“你必须用@NonNull注释主键。”name“可以为空。”

我不明白这个错误的来源是什么，因为我非常清楚地使用声明为复合主键一部分的@NonNull注释我的String变量“name”。我是否错误地设置了复合主键？

@Entity(tableName = "ScavItems",
        primaryKeys = { "scavHuntID", "name" },
        foreignKeys = {
                @ForeignKey(entity = ScavHunt.class,
                        parentColumns = "shID",
                        childColumns = "scavHuntID")
        })
public class ScavItem {
    @NonNull private int scavHuntID;
    @NonNull private String name;

    @ColumnInfo(name = "found")
    private boolean found;

    public ScavItem(int scavHuntID, String name){
        this.scavHuntID = scavHuntID;
        this.name = name;
        found = false;
    }

    public String getName(){ return this.name; }
    public boolean getFound(){ return this.found; }
    public int getScavHuntID(){ return this.scavHuntID; }
    public void setFound(boolean found){ this.found = found; }
}

Answer 1

我明白了。我导入了错误的NonNull包。这是正确的导入：

import android.support.annotation.NonNull;

如何正确注释属于Room实体主键的对象变量？

1 个答案: