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Jetpack DataStore in MVVM
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| import com.github.crazygit.tikheart.TikHeartApplication | |
| import com.github.crazygit.tikheart.data.dao.UserInfoDao | |
| import com.github.crazygit.tikheart.data.model.UserInfo | |
| import com.github.crazygit.tikheart.utilities.LocalStorage | |
| object LocalRepository { | |
| private val localStorage = LocalStorage(TikHeartApplication.appContext) | |
| private val localUserDao = UserInfoDao(localStorage) | |
| fun getUserInfo() = localUserDao.getUserInfo() | |
| suspend fun saveUser(userInfo: UserInfo) = localUserDao.saveUserInfo(userInfo) | |
| suspend fun removeUserInfo() = localUserDao.removeUserInfo() | |
| } |
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| import android.content.Context | |
| import androidx.datastore.core.DataStore | |
| import androidx.datastore.preferences.core.Preferences | |
| import androidx.datastore.preferences.core.edit | |
| import androidx.datastore.preferences.core.preferencesKey | |
| import androidx.datastore.preferences.createDataStore | |
| import kotlinx.coroutines.flow.map | |
| class LocalStorage(appContext: Context) { | |
| val dataStore: DataStore<Preferences> = appContext.createDataStore( | |
| name = "AppDataStore" | |
| ) | |
| suspend inline fun <reified T> save(key: Preferences.Key<T>, value: Any) { | |
| dataStore.edit { | |
| it[key] = value as T | |
| } | |
| } | |
| inline fun <reified T> get(key: Preferences.Key<T>, default: T) = dataStore.data.map { | |
| it[key] ?: default | |
| } | |
| companion object PreferenceKeys { | |
| val USER_INFO_KEY = preferencesKey<String>("user_info") | |
| } | |
| } |
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| import android.content.Context | |
| import androidx.test.ext.junit.runners.AndroidJUnit4 | |
| import androidx.test.platform.app.InstrumentationRegistry | |
| import com.github.crazygit.tikheart.utilities.LocalStorage | |
| import com.google.common.truth.Truth.assertThat | |
| import kotlinx.coroutines.flow.first | |
| import kotlinx.coroutines.runBlocking | |
| import org.junit.Before | |
| import org.junit.Test | |
| import org.junit.runner.RunWith | |
| @RunWith(AndroidJUnit4::class) | |
| class LocalStorageTest { | |
| private val appContext: Context = InstrumentationRegistry.getInstrumentation().targetContext | |
| private lateinit var localStorage: LocalStorage | |
| @Before | |
| fun init() { | |
| localStorage = LocalStorage(appContext) | |
| } | |
| @Test | |
| fun testLocalStorage() = runBlocking { | |
| val data = "hello" | |
| localStorage.save(LocalStorage.USER_INFO_KEY, data) | |
| assertThat(localStorage.get(LocalStorage.USER_INFO_KEY, "").first()).isEqualTo(data) | |
| } | |
| } |
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| import com.github.crazygit.tikheart.utilities.LocalStorage | |
| import com.github.crazygit.tikheart.data.model.UserInfo | |
| import com.google.gson.Gson | |
| import com.google.gson.JsonSyntaxException | |
| import kotlinx.coroutines.flow.Flow | |
| import kotlinx.coroutines.flow.map | |
| class UserInfoDao(private val localStorage: LocalStorage) { | |
| fun getUserInfo(): Flow<UserInfo?> = localStorage.get(LocalStorage.USER_INFO_KEY, "").map { | |
| try { | |
| Gson().fromJson(it, UserInfo::class.java) | |
| } catch (e: JsonSyntaxException) { | |
| null | |
| } | |
| } | |
| suspend fun saveUserInfo(userInfo: UserInfo) = | |
| localStorage.save(LocalStorage.USER_INFO_KEY, Gson().toJson(userInfo)) | |
| suspend fun removeUserInfo() = localStorage.save(LocalStorage.USER_INFO_KEY, "") | |
| } |
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