AndroidJetpack:如何将Paging与Room结合使用?
创始人
2024-10-08 12:02:09
0
  1. 首先,在app的build.gradle文件中添加以下依赖项:
dependencies {
    def lifecycle_version = "2.2.0"

    implementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycle_version"
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
    implementation "androidx.paging:paging-runtime-ktx:2.1.2"
    implementation "androidx.room:room-runtime:2.2.5"
    kapt "androidx.room:room-compiler:2.2.5"
}
  1. 然后,创建一个Room数据库,其中包含要进行分页的实体类:
@Entity(tableName = "my_table")
data class MyEntity(
    @PrimaryKey(autoGenerate = true) val id: Int = 0,
    val name: String
)
@Database(entities = [MyEntity::class], version = 1, exportSchema = false)
abstract class MyDatabase : RoomDatabase() {

    abstract fun myDao(): MyDao

    companion object {
        private const val DATABASE_NAME = "my_database"
        private var instance: MyDatabase? = null

        fun getInstance(context: Context): MyDatabase {
            return instance ?: synchronized(this) {
                instance ?: Room.databaseBuilder(
                    context.applicationContext,
                    MyDatabase::class.java,
                    DATABASE_NAME
                ).build().also { instance = it }
            }
        }
    }
}
  1. 接下来,创建一个Dao接口,其中包含用于获取数据的分页查询:
@Dao
interface MyDao {

    @Query("SELECT * FROM my_table ORDER BY id DESC")
    fun getData(): DataSource.Factory

}
  1. 创建一个ViewModel类,它将使用MyDao类的方法将数据返回并对其进行分页:
class MyViewModel(application: Application) : AndroidViewModel(application) {

    private val dao: MyDao = MyDatabase.getInstance(application).myDao()

    fun getData(): LiveData> =
        Pager(PagedList.Config.Builder()
            .setPageSize(10)
            .setInitialLoadSize

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