Import and export data

app/src/main/java/org/librefit/db/AppDatabase.kt

@@ -8,8 +8,10 @@
 
 package org.librefit.db
 
+import android.content.Context
 import androidx.room.AutoMigration
 import androidx.room.Database
+import androidx.room.Room
 import androidx.room.RoomDatabase
 import androidx.room.TypeConverters
 import androidx.room.migration.Migration
@@ -38,6 +40,29 @@ abstract class AppDatabase : RoomDatabase() {
     companion object {
         const val NAME = "librefit_database"
 
+        @Volatile
+        private var INSTANCE: AppDatabase? = null
+
+        fun getInstance(context: Context): AppDatabase {
+            return INSTANCE ?: synchronized(this) {
+                val instance = Room.databaseBuilder(
+                    context.applicationContext,
+                    AppDatabase::class.java,
+                    NAME
+                )
+                    .addMigrations(MIGRATION_2_3)
+                    .build()
+
+                INSTANCE = instance
+                instance
+            }
+        }
+
+        fun closeInstance() {
+            INSTANCE?.close()
+            INSTANCE = null
+        }
+
         val MIGRATION_2_3 = object : Migration(2, 3) {
             override fun migrate(db: SupportSQLiteDatabase) {
                 db.execSQL(

app/src/main/java/org/librefit/db/repository/ImportExportRepository.kt

@@ -0,0 +1,67 @@
+package org.librefit.db.repository
+
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import dagger.hilt.android.qualifiers.ApplicationContext
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import org.librefit.db.AppDatabase
+import java.io.File
+import javax.inject.Inject
+import kotlin.system.exitProcess
+
+class ImportExportRepository @Inject constructor(
+    private val db: AppDatabase,
+    @ApplicationContext private val context: Context
+) {
+    suspend fun exportTo(uri: Uri) = withContext(Dispatchers.IO) {
+        val sqliteDb = db.openHelper.writableDatabase
+
+        val tempFile = File(context.cacheDir, "backup.db")
+
+        val path = tempFile.absolutePath.replace("'", "''")
+        sqliteDb.execSQL("VACUUM INTO '$path'")
+
+        context.contentResolver.openOutputStream(uri)?.use { out ->
+            tempFile.inputStream().use { input ->
+                input.copyTo(out)
+            }
+        }
+
+        tempFile.delete()
+    }
+
+    suspend fun importFrom(uri: Uri): Nothing = withContext(Dispatchers.IO) {
+        val dbFile = context.getDatabasePath(AppDatabase.NAME)
+
+        AppDatabase.closeInstance()
+
+        val tempFile = File(context.cacheDir, "restore.db")
+
+        context.contentResolver.openInputStream(uri)?.use { input ->
+            tempFile.outputStream().use { output ->
+                input.copyTo(output)
+            }
+        }
+
+        val wal = File(dbFile.path + "-wal")
+        val shm = File(dbFile.path + "-shm")
+
+        wal.delete()
+        shm.delete()
+
+        tempFile.copyTo(dbFile, overwrite = true)
+        tempFile.delete()
+
+        AppDatabase.getInstance(context) // Reinitialize with the new DB file
+        // restart app process cleanly
+        val intent = context.packageManager
+            .getLaunchIntentForPackage(context.packageName)
+
+        intent?.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
+
+        context.startActivity(intent)
+        exitProcess(0)
+    }
+}

app/src/main/java/org/librefit/ui/models/UiBackupEvent.kt

@@ -0,0 +1,7 @@
+package org.librefit.ui.models
+
+sealed interface BackupEvent {
+    object BackupSuccess : BackupEvent
+    object RestoreSuccess : BackupEvent
+    data class Error(val message: String) : BackupEvent
+}

app/src/main/java/org/librefit/ui/screens/settings/SettingsScreen.kt

@@ -8,7 +8,11 @@
 
 package org.librefit.ui.screens.settings
 
+import android.net.Uri
 import android.os.Build
+import android.widget.Toast
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.animation.ExperimentalSharedTransitionApi
 import androidx.compose.animation.animateContentSize
 import androidx.compose.foundation.layout.Arrangement
@@ -21,9 +25,12 @@ import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.ExperimentalMaterial3ExpressiveApi
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Switch
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -32,6 +39,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.painter.Painter
 import androidx.compose.ui.hapticfeedback.HapticFeedbackType
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalHapticFeedback
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
@@ -53,6 +61,7 @@ import org.librefit.ui.components.HeadlineText
 import org.librefit.ui.components.LibreFitLazyColumn
 import org.librefit.ui.components.LibreFitScaffold
 import org.librefit.ui.components.dialogs.PreferenceDialog
+import org.librefit.ui.models.BackupEvent
 import org.librefit.ui.theme.LibreFitTheme
 import org.librefit.util.Formatter
 import kotlin.random.Random
@@ -105,7 +114,9 @@ fun SettingsScreen(
         isSupporter = isSupporter,
         isWorkoutHeaderSticky = isWorkoutHeaderSticky,
         updatePreferences = viewModel::updatePreferences,
-        saveBooleanValue = viewModel::savePreference
+        saveBooleanValue = viewModel::savePreference,
+        backupExport = viewModel::backupExport,
+        backupImport = viewModel::backupImport
     )
 }
 
@@ -121,7 +132,9 @@ private fun SettingsScreenContent(
     isSupporter: Boolean,
     isWorkoutHeaderSticky: Boolean,
     updatePreferences: (List<DialogPreference>) -> Unit,
-    saveBooleanValue: (Preferences.Key<Boolean>, value: Boolean) -> Unit
+    saveBooleanValue: (Preferences.Key<Boolean>, value: Boolean) -> Unit,
+    backupExport: (Uri) -> Unit,
+    backupImport: (Uri) -> Unit
 ) {
     LibreFitScaffold(
         title = AnnotatedString(stringResource(id = R.string.settings)),
@@ -228,6 +241,43 @@ private fun SettingsScreenContent(
                     settingName = stringResource(R.string.stick_status_bar)
                 )
             }
+
+            item {
+                val launcher = rememberLauncherForActivityResult(
+                    contract = ActivityResultContracts.CreateDocument("application/octet-stream")
+                ) { uri ->
+                    uri?.let { backupExport(it) }
+                }
+
+                SettingItem(
+                    onClick = {
+                        val fileName = "librefit-backup.db"
+                        launcher.launch(fileName)
+                    },
+                    icon = painterResource(R.drawable.ic_backup),
+                    settingName = stringResource(id = R.string.export_data),
+                    settingDesc = stringResource(R.string.export_data_desc)
+                )
+            }
+
+            item {
+                val launcher =
+                    rememberLauncherForActivityResult(
+                        contract = ActivityResultContracts.OpenDocument()
+                    ) { uri: Uri? ->
+                        uri?.let {
+                            backupImport(it)
+                        }
+                    }
+                SettingItem(
+                    onClick = {
+                        launcher.launch(arrayOf("*/*"))
+                    },
+                    icon = painterResource(R.drawable.ic_restore),
+                    settingName = stringResource(id = R.string.import_data),
+                    settingDesc = stringResource(R.string.import_data_desc)
+                )
+            }
         }
     }
 }
@@ -331,6 +381,8 @@ fun SettingsScreenPreview() {
                     }
                 }
             },
+            backupExport = {},
+            backupImport = {}
         )
     }
 }

app/src/main/java/org/librefit/ui/screens/settings/SettingsScreenViewModel.kt

@@ -8,28 +8,34 @@
 
 package org.librefit.ui.screens.settings
 
+import android.net.Uri
 import androidx.datastore.preferences.core.Preferences
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asSharedFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
+import org.librefit.db.repository.ImportExportRepository
 import org.librefit.db.repository.UserPreferencesRepository
 import org.librefit.enums.userPreferences.DialogPreference
 import org.librefit.enums.userPreferences.Language
 import org.librefit.enums.userPreferences.ThemeMode
+import org.librefit.ui.models.BackupEvent
 import javax.inject.Inject
 
 @HiltViewModel
 class SettingsScreenViewModel @Inject constructor(
-    private val userPreferences: UserPreferencesRepository
+    private val userPreferences: UserPreferencesRepository,
+    private val importExportRepository: ImportExportRepository
 ) : ViewModel() {
     val themeMode = userPreferences.themeMode
     val materialMode = userPreferences.materialMode
@@ -90,4 +96,33 @@ class SettingsScreenViewModel @Inject constructor(
             )
         }
     }
+
+    private val _events = MutableSharedFlow<BackupEvent>()
+    val events = _events.asSharedFlow()
+
+    fun backupExport(uri: Uri) {
+        viewModelScope.launch {
+            try {
+                importExportRepository.exportTo(uri)
+            } catch (e: Exception) {
+                // TODO: catch and show
+                _events.emit(
+                    BackupEvent.Error(e.message ?: "Data backup export failed")
+                )
+            }
+        }
+    }
+
+    fun backupImport(uri: Uri) {
+        viewModelScope.launch {
+            try {
+                importExportRepository.importFrom(uri)
+            } catch (e: Exception) {
+                // TODO: catch and show
+                _events.emit(
+                    BackupEvent.Error(e.message ?: "Data backup restore failed")
+                )
+            }
+        }
+    }
 }

app/src/main/res/drawable/ic_backup.xml

@@ -0,0 +1,24 @@
+<!--
+  ~ Copyright (C) 2026 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960">
+  <path
+      android:pathData="M260,800q-91,0 -155.5,-63T40,583q0,-78 47,-139t123,-78q25,-92 100,-149t170,-57q117,0 198.5,81.5T760,440q69,8 114.5,59.5T920,620q0,75 -52.5,127.5T740,800L520,800q-33,0 -56.5,-23.5T440,720v-206l-64,62 -56,-56 160,-160 160,160 -56,56 -64,-62v206h220q42,0 71,-29t29,-71q0,-42 -29,-71t-71,-29h-60v-80q0,-83 -58.5,-141.5T480,240q-83,0 -141.5,58.5T280,440h-20q-58,0 -99,41t-41,99q0,58 41,99t99,41h100v80L260,800ZM480,520Z"
+      android:fillColor="#000000"/>
+</vector>

app/src/main/res/drawable/ic_restore.xml

@@ -0,0 +1,24 @@
+<!--
+  ~ Copyright (C) 2026 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960">
+  <path
+      android:pathData="M260,800q-91,0 -155.5,-63T40,583q0,-78 47,-139t123,-78q17,-72 85,-137t145,-65q33,0 56.5,23.5T520,244v242l64,-62 56,56 -160,160 -160,-160 56,-56 64,62v-242q-76,14 -118,73.5T280,440h-20q-58,0 -99,41t-41,99q0,58 41,99t99,41h480q42,0 71,-29t29,-71q0,-42 -29,-71t-71,-29h-60v-80q0,-48 -22,-89.5T600,280v-93q74,35 117,103.5T760,440q69,8 114.5,59.5T920,620q0,75 -52.5,127.5T740,800L260,800ZM480,442Z"
+      android:fillColor="#000000"/>
+</vector>

app/src/main/res/values/strings.xml

@@ -263,6 +263,12 @@
     <string name="stick_status_bar">Stick status bar</string>
     <string name="stick_status_bar_desc">The status bar of ongoing workout will be stuck at the top of the screen</string>
     <string name="not_stick_status_bar_desc">The status bar of ongoing workout won\'t be stuck at the top of the screen</string>
+    <string name="export_data">Export data</string>
+    <string name="export_data_desc">Export the current database</string>
+    <string name="export_data_success">Data exported successfully</string>
+    <string name="import_data">Import data</string>
+    <string name="import_data_desc">Import backed up data</string>
+    <string name="import_data_success">Data imported successfully</string>
 
 
     <!-- Statistics screen-->