android - Room中如何实现同步(Android持久化库)

Question

在普通的 sqlite 中我们可以很容易地实现同步，但是如何在 Room 中实现它

Answer 1

这是 sample它显示了如何将 Room 与 Content Provider 一起使用，然后您可以将 (ContentProvider ) 链接到您的 SynchronizationAdapter。

话虽如此，您可以像这样修改房间模型

@Entity(tableName = Student.TABLE_NAME) 
public class Student { 
    /** The name of the Student table. */ 
    public static final String TABLE_NAME = "student"; 


    /** The name of the ID column. */ 
    public static final String COLUMN_ID = BaseColumns._ID; 


    /** The name of the name column. */ 
    public static final String COLUMN_NAME = "name"; 


    /** The unique ID of the Student*/ 
    @PrimaryKey(autoGenerate = true) 
    @ColumnInfo(index = true, name = COLUMN_ID) 
    public long id; 


    /** The name of the Student*/ 
    @ColumnInfo(name = COLUMN_NAME) 
    public String name; 


    /** 
     * Create a new {@link Studentfrom the specified {@link ContentValues}. 
     * 
     * @param values A {@link ContentValues} that at least contain {@link #COLUMN_NAME}. 
     * @return A newly created {@link Student} instance. 
     */ 
    public static Student fromContentValues(ContentValues values) { 
        final Student student= new Student(); 
        if (values.containsKey(COLUMN_ID)) {
            student.id = values.getAsLong(COLUMN_ID); 
        } 
        if (values.containsKey(COLUMN_NAME)) { 
            student.name = values.getAsString(COLUMN_NAME); 
        }
        return student; 
    }
}