在使用Android分页库(Paging Library)进行SQLite数据存储时,需要关注以下几个方面:
public class MyDatabaseHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "my_database";
private static final int DATABASE_VERSION = 1;
public MyDatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
// 创建表的逻辑
db.execSQL("CREATE TABLE IF NOT EXISTS my_table (id INTEGER PRIMARY KEY, name TEXT)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// 升级表的逻辑
db.execSQL("DROP TABLE IF EXISTS my_table");
onCreate(db);
}
}
@Dao
public interface MyDao {
@Query("SELECT * FROM my_table")
DataSource.Factory getAllData();
@Insert(onConflict = OnConflictStrategy.REPLACE)
void insertData(MyEntity entity);
@Delete
void deleteData(MyEntity entity);
}
@Entity(tableName = "my_table")
public class MyEntity {
@PrimaryKey
private int id;
@ColumnInfo(name = "name")
private String name;
// getter和setter方法
}
public class MyDataSourceFactory implements DataSource.Factory {
private MyDao myDao;
public MyDataSourceFactory(MyDao myDao) {
this.myDao = myDao;
}
@Override
public DataSource create() {
return myDao.getAllData();
}
}
public class MyBoundaryCallback extends PagedList.BoundaryCallback {
private MyDao myDao;
public MyBoundaryCallback(MyDao myDao) {
this.myDao = myDao;
}
@Override
public void onItemAtEndLoaded(@NonNull MyEntity itemAtEnd) {
// 加载更多数据的逻辑
// 例如,可以在这里调用myDao.insertData()方法来插入更多数据
}
}
以上是使用Android分页库(Paging Library)进行SQLite数据存储的关注点和代码示例。在实际应用中,您可以根据具体需求进行适当的调整和扩展。