Auto backup (#247)

* implementation of auto-backup function
add an option to overwrite previous backup

* open import and export file chooser intent.

android_app/app/src/main/java/com/health/openscale/core/OpenScale.java

@@ -22,6 +22,7 @@ import android.arch.persistence.room.RoomDatabase;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabaseCorruptException;
 import android.net.Uri;
 import android.os.Handler;
 import android.preference.PreferenceManager;
@@ -54,6 +55,7 @@ import com.health.openscale.gui.views.MeasurementViewSettings;
 import com.health.openscale.gui.views.WaterMeasurementView;
 
 import java.io.BufferedReader;
+import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
@@ -107,7 +109,7 @@ public class OpenScale {
         return instance;
     }
 
-    public void reopenDatabase() {
+    public void reopenDatabase() throws SQLiteDatabaseCorruptException {
         if (appDB != null) {
             appDB.close();
         }
@@ -393,6 +395,56 @@ public class OpenScale {
         }
     }
 
+    public void importDatabase(Uri importFile) throws IOException {
+        File exportFile = context.getApplicationContext().getDatabasePath("openScale.db");
+        File tmpExportFile = context.getApplicationContext().getDatabasePath("openScale_tmp.db");
+
+        try {
+            copyFile(Uri.fromFile(exportFile), Uri.fromFile(tmpExportFile));
+            copyFile(importFile, Uri.fromFile(exportFile));
+
+            reopenDatabase();
+
+            if (!getScaleUserList().isEmpty()) {
+                selectScaleUser(getScaleUserList().get(0).getId());
+                updateScaleData();
+            }
+        } catch (SQLiteDatabaseCorruptException e) {
+            copyFile(Uri.fromFile(tmpExportFile), Uri.fromFile(exportFile));
+            throw new IOException(e.getMessage());
+        } finally {
+            tmpExportFile.delete();
+        }
+    }
+
+    public void exportDatabase(Uri exportFile) throws IOException {
+        File dbFile = context.getApplicationContext().getDatabasePath("openScale.db");
+
+        copyFile(Uri.fromFile(dbFile), exportFile);
+    }
+
+    private void copyFile(Uri src, Uri dst) throws IOException {
+        InputStream input = context.getContentResolver().openInputStream(src);
+        OutputStream output = context.getContentResolver().openOutputStream(dst);
+
+        try {
+            byte[] bytes = new byte[4096];
+            int count;
+
+            while ((count = input.read(bytes)) != -1){
+                output.write(bytes, 0, count);
+            }
+        } finally {
+            if (input != null) {
+                input.close();
+            }
+            if (output != null) {
+                output.flush();
+                output.close();
+            }
+        }
+    }
+
     public void importData(Uri uri) {
         try {
             final String filename = getFilenameFromUri(uri);

android_app/app/src/main/java/com/health/openscale/core/alarm/AlarmBackupHandler.java

@@ -0,0 +1,113 @@
+/* Copyright (C) 2018  olie.xdev <olie.xdev@googlemail.com>
+*
+*    This program is free software: you can redistribute it and/or modify
+*    it under the terms of the GNU General Public License as published by
+*    the Free Software Foundation, either version 3 of the License, or
+*    (at your option) any later version.
+*
+*    This program is distributed in the hope that it will be useful,
+*    but WITHOUT ANY WARRANTY; without even the implied warranty of
+*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*    GNU General Public License for more details.
+*
+*    You should have received a copy of the GNU General Public License
+*    along with this program.  If not, see <http://www.gnu.org/licenses/>
+*/
+package com.health.openscale.core.alarm;
+
+import android.app.AlarmManager;
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.net.Uri;
+import android.os.Environment;
+import android.preference.PreferenceManager;
+import android.util.Log;
+
+import com.health.openscale.core.OpenScale;
+
+import java.io.File;
+import java.io.IOException;
+import java.text.DateFormat;
+import java.util.Date;
+
+public class AlarmBackupHandler
+{
+    public static final String INTENT_EXTRA_BACKUP_ALARM = "alarmBackupIntent";
+    private static final int ALARM_NOTIFICATION_ID = 0x02;
+
+    public void scheduleAlarms(Context context)
+    {
+        disableAlarm(context);
+
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+
+        if (prefs.getBoolean("autoBackup", true)) {
+
+            String backupSchedule = prefs.getString("autoBackup_Schedule", "Monthly");
+
+            long intervalDayMultiplicator = 0;
+
+            switch (backupSchedule) {
+                case "Daily":
+                    intervalDayMultiplicator = 1;
+                    break;
+                case "Weekly":
+                    intervalDayMultiplicator = 7;
+                    break;
+                case "Monthly":
+                    intervalDayMultiplicator = 30;
+                    break;
+            }
+
+            PendingIntent alarmPendingIntent = getPendingAlarmIntent(context);
+            AlarmManager alarmMgr = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
+            alarmMgr.setInexactRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
+                    AlarmManager.INTERVAL_DAY * intervalDayMultiplicator, alarmPendingIntent);
+        }
+    }
+
+    private PendingIntent getPendingAlarmIntent(Context context)
+    {
+        Intent alarmIntent = new Intent(context, ReminderBootReceiver.class);
+        alarmIntent.putExtra(INTENT_EXTRA_BACKUP_ALARM, true);
+
+        return PendingIntent.getBroadcast(context, ALARM_NOTIFICATION_ID, alarmIntent, PendingIntent.FLAG_UPDATE_CURRENT);
+    }
+
+    public void disableAlarm(Context context) {
+        AlarmManager alarmMgr = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
+
+        alarmMgr.cancel(getPendingAlarmIntent(context));
+    }
+
+    public void executeBackup(Context context) {
+        OpenScale openScale = OpenScale.getInstance(context);
+
+        String databaseName = "openScale.db";
+
+        File exportDir = new File(Environment.getExternalStorageDirectory(), PreferenceManager.getDefaultSharedPreferences(context).getString("exportDir", "openScale Backup"));
+        if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
+            return;
+
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+
+        if (!prefs.getBoolean("overwriteBackup", false)) {
+            databaseName = DateFormat.getDateInstance(DateFormat.SHORT).format(new Date()) + "_" + databaseName;
+        }
+
+        File exportFile = new File(exportDir, databaseName);
+
+        if (!exportDir.exists()) {
+            exportDir.mkdirs();
+        }
+
+        try {
+            openScale.exportDatabase(Uri.fromFile(exportFile));
+            Log.d("AlarmBackupHandler", "openScale Auto Backup to " + exportFile);
+        } catch (IOException e) {
+            Log.e("AlarmBackupHandler", "Error while exporting database: " + e.getMessage());
+        }
+    }
+}

android_app/app/src/main/java/com/health/openscale/core/alarm/ReminderBootReceiver.java

@@ -27,6 +27,8 @@ public class ReminderBootReceiver extends BroadcastReceiver
     {
         if (intent.hasExtra(AlarmHandler.INTENT_EXTRA_ALARM)) handleAlarm(context);
 
+        if (intent.hasExtra(AlarmBackupHandler.INTENT_EXTRA_BACKUP_ALARM)) handleBackupAlarm(context);
+
         if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) scheduleAlarms(context);
     }
 
@@ -36,9 +38,18 @@ public class ReminderBootReceiver extends BroadcastReceiver
         alarmHandler.showAlarmNotification(context);
     }
 
+    private void handleBackupAlarm(Context context)
+    {
+        AlarmBackupHandler alarmBackupHandler = new AlarmBackupHandler();
+        alarmBackupHandler.executeBackup(context);
+    }
+
     private void scheduleAlarms(Context context)
     {
         AlarmHandler alarmHandler = new AlarmHandler();
+        AlarmBackupHandler alarmBackupHandler = new AlarmBackupHandler();
+
         alarmHandler.scheduleAlarms(context);
+        alarmBackupHandler.scheduleAlarms(context);
     }
 }

android_app/app/src/main/java/com/health/openscale/gui/preferences/BackupPreferences.java

@@ -15,32 +15,48 @@
 */
 package com.health.openscale.gui.preferences;
 
+import android.content.ComponentName;
+import android.content.Intent;
+import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
+import android.net.Uri;
 import android.os.Bundle;
-import android.os.Environment;
+import android.preference.CheckBoxPreference;
 import android.preference.EditTextPreference;
+import android.preference.ListPreference;
+import android.preference.MultiSelectListPreference;
 import android.preference.Preference;
 import android.preference.PreferenceFragment;
+import android.preference.PreferenceGroup;
 import android.widget.Toast;
 
 import com.health.openscale.R;
 import com.health.openscale.core.OpenScale;
-import com.health.openscale.core.datatypes.ScaleUser;
+import com.health.openscale.core.alarm.AlarmBackupHandler;
+import com.health.openscale.core.alarm.ReminderBootReceiver;
 import com.health.openscale.gui.utils.PermissionHelper;
 
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
 import java.io.IOException;
-import java.nio.channels.FileChannel;
+import java.util.ArrayList;
 import java.util.List;
+import java.util.Set;
 
-public class BackupPreferences extends PreferenceFragment {
-    private static final String PREFERENCE_KEY_EXPORT_DIR = "exportDir";
+import static android.app.Activity.RESULT_OK;
+
+public class BackupPreferences extends PreferenceFragment implements SharedPreferences.OnSharedPreferenceChangeListener {
     private static final String PREFERENCE_KEY_IMPORT_BACKUP = "importBackup";
     private static final String PREFERENCE_KEY_EXPORT_BACKUP = "exportBackup";
+    private static final String PREFERENCE_KEY_AUTO_BACKUP = "autoBackup";
 
-    private EditTextPreference exportDir;
+    private static final int IMPORT_DATA_REQUEST = 100;
+    private static final int EXPORT_DATA_REQUEST = 101;
+
+    private Preference importBackup;
+    private Preference exportBackup;
+
+    private CheckBoxPreference autoBackup;
+
+    private boolean isAutoBackupAskForPermission;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
@@ -48,150 +64,230 @@ public class BackupPreferences extends PreferenceFragment {
 
         addPreferencesFromResource(R.xml.backup_preferences);
 
-        exportDir = (EditTextPreference) findPreference(PREFERENCE_KEY_EXPORT_DIR);
-        exportDir.setSummary(exportDir.getText());
-        exportDir.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+        importBackup = (Preference) findPreference(PREFERENCE_KEY_IMPORT_BACKUP);
+        importBackup.setOnPreferenceClickListener(new onClickListenerImportBackup());
+
+        exportBackup = (Preference) findPreference(PREFERENCE_KEY_EXPORT_BACKUP);
+        exportBackup.setOnPreferenceClickListener(new onClickListenerExportBackup());
+
+        autoBackup = (CheckBoxPreference) findPreference(PREFERENCE_KEY_AUTO_BACKUP);
+        autoBackup.setOnPreferenceClickListener(new onClickListenerAutoBackup());
+
+        initSummary(getPreferenceScreen());
+        updateBackupPreferences();
+    }
+
+    void updateBackupPreferences() {
+        ComponentName receiver = new ComponentName(getActivity().getApplicationContext(), ReminderBootReceiver.class);
+        PackageManager pm = getActivity().getApplicationContext().getPackageManager();
+
+        AlarmBackupHandler alarmBackupHandler = new AlarmBackupHandler();
+
+        isAutoBackupAskForPermission = false;
+
+        if (autoBackup.isChecked()) {
+            alarmBackupHandler.scheduleAlarms(getActivity());
+
+            pm.setComponentEnabledSetting(receiver, PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
+                    PackageManager.DONT_KILL_APP);
+        } else {
+            alarmBackupHandler.disableAlarm(getActivity());
+
+            pm.setComponentEnabledSetting(receiver, PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
+                    PackageManager.DONT_KILL_APP);
+        }
+    }
+
     @Override
-            public boolean onPreferenceChange(Preference preference, Object newValue) {
-                preference.setSummary((String) newValue);
+    public void onResume()
+    {
+        super.onResume();
+        getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
+    }
+
+    @Override
+    public void onPause()
+    {
+        getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
+        super.onPause();
+    }
+
+    @Override
+    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key)
+    {
+        updatePrefSummary(findPreference(key));
+        updateBackupPreferences();
+    }
+
+    private void initSummary(Preference p) {
+        if (p instanceof PreferenceGroup) {
+            PreferenceGroup pGrp = (PreferenceGroup) p;
+            for (int i = 0; i < pGrp.getPreferenceCount(); i++) {
+                initSummary(pGrp.getPreference(i));
+            }
+        } else {
+            updatePrefSummary(p);
+        }
+    }
+
+    private void updatePrefSummary(Preference p)
+    {
+        if (p instanceof ListPreference)
+        {
+            ListPreference listPref = (ListPreference) p;
+            p.setSummary(listPref.getEntry());
+        }
+
+        if (p instanceof EditTextPreference)
+        {
+            EditTextPreference editTextPref = (EditTextPreference) p;
+            if (p.getTitle().toString().contains("assword"))
+            {
+                p.setSummary("******");
+            }
+            else
+            {
+                p.setSummary(editTextPref.getText());
+            }
+        }
+
+        if (p instanceof MultiSelectListPreference)
+        {
+            MultiSelectListPreference editMultiListPref = (MultiSelectListPreference) p;
+
+            CharSequence[] entries = editMultiListPref.getEntries();
+            CharSequence[] entryValues = editMultiListPref.getEntryValues();
+            List<String> currentEntries = new ArrayList<>();
+            Set<String> currentEntryValues = editMultiListPref.getValues();
+
+            for (int i = 0; i < entries.length; i++)
+            {
+                if (currentEntryValues.contains(entryValues[i].toString())) currentEntries.add(entries[i].toString());
+            }
+
+            p.setSummary(currentEntries.toString());
+        }
+    }
+
+    private class onClickListenerAutoBackup implements Preference.OnPreferenceClickListener {
+        @Override
+        public boolean onPreferenceClick(Preference preference) {
+            if (autoBackup.isChecked()) {
+                isAutoBackupAskForPermission = true;
+
+                PermissionHelper.requestWritePermission(getActivity());
+            }
+
             return true;
         }
-        });
+    }
 
-        Preference importBackup = findPreference(PREFERENCE_KEY_IMPORT_BACKUP);
-        importBackup.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+    private class onClickListenerImportBackup implements Preference.OnPreferenceClickListener {
         @Override
         public boolean onPreferenceClick(Preference preference) {
             if (PermissionHelper.requestReadPermission(getActivity())) {
                 importBackup();
             }
+
             return true;
         }
-        });
+    }
 
-        Preference exportBackup = findPreference(PREFERENCE_KEY_EXPORT_BACKUP);
-        exportBackup.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+    private class onClickListenerExportBackup implements Preference.OnPreferenceClickListener {
         @Override
         public boolean onPreferenceClick(Preference preference) {
             if (PermissionHelper.requestWritePermission(getActivity())) {
                 exportBackup();
             }
+
             return true;
         }
-        });
     }
 
-    private boolean isExternalStoragePresent() {
-        return Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+
+        if (resultCode != RESULT_OK || data == null) {
+            return;
         }
 
-    private File getExportDir() {
-        if (!isExternalStoragePresent()) {
-            return null;
-        }
+        OpenScale openScale = OpenScale.getInstance(getActivity().getApplicationContext());
 
-        return new File(Environment.getExternalStorageDirectory(), exportDir.getText());
+        switch (requestCode) {
+            case IMPORT_DATA_REQUEST:
+                Uri importURI = data.getData();
+
+                try {
+                    openScale.importDatabase(importURI);
+                    Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.info_data_imported) + " " + importURI.getPath(), Toast.LENGTH_SHORT).show();
+                } catch (IOException e) {
+                    Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.error_importing) + " " + e.getMessage(), Toast.LENGTH_LONG).show();
+                    return;
+                }
+                break;
+
+            case EXPORT_DATA_REQUEST:
+                Uri exportURI = data.getData();
+
+                try {
+                    openScale.exportDatabase(exportURI);
+                    Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.info_data_exported) +  " " + exportURI.getPath(), Toast.LENGTH_SHORT).show();
+                } catch (IOException e) {
+                    Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.error_exporting) + " " + e.getMessage(), Toast.LENGTH_LONG).show();
+                    return;
+                }
+                break;
+        }
     }
 
     private boolean importBackup() {
-        File exportDir = getExportDir();
-        if (exportDir == null) {
-            return false;
-        }
+        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
+        intent.addCategory(Intent.CATEGORY_OPENABLE);
+        intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+        intent.setType("*/*");
 
-        File dbFile = getActivity().getDatabasePath(OpenScale.DATABASE_NAME);
-        File importFile = new File(exportDir, OpenScale.DATABASE_NAME);
-
-        if (!importFile.exists()) {
-            Toast.makeText(getActivity(), getResources().getString(R.string.error_importing)
-                    + " "  + importFile.getPath() + " "
-                    + getResources().getString(R.string.label_not_found), Toast.LENGTH_SHORT).show();
-            return false;
-        }
-
-        try {
-            dbFile.createNewFile();
-            copyFile(importFile, dbFile);
-
-            Toast.makeText(getActivity(), getResources().getString(R.string.info_data_imported)
-                    + " " + importFile.getPath(), Toast.LENGTH_SHORT).show();
-        } catch (IOException e) {
-            Toast.makeText(getActivity(), getResources().getString(R.string.error_importing)
-                    + " " + e.getMessage(), Toast.LENGTH_SHORT).show();
-            return false;
-        }
-
-        OpenScale openScale = OpenScale.getInstance(getActivity());
-        openScale.reopenDatabase();
-
-        List<ScaleUser> scaleUserList = openScale.getScaleUserList();
-
-        if (!scaleUserList.isEmpty()) {
-            openScale.selectScaleUser(scaleUserList.get(0).getId());
-            openScale.updateScaleData();
-        }
+        startActivityForResult(
+                Intent.createChooser(intent, getResources().getString(R.string.label_import)),
+                IMPORT_DATA_REQUEST);
 
         return true;
     }
 
     private boolean exportBackup() {
-        File exportDir = getExportDir();
-        if (exportDir == null) {
-            return false;
-        }
+        Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
+        intent.addCategory(Intent.CATEGORY_OPENABLE);
+        intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
+        intent.setType("*/*");
 
-        // Make sure all changes are written to the file before exporting
-        OpenScale.getInstance(getActivity()).reopenDatabase();
-
-        File dbFile = getActivity().getDatabasePath(OpenScale.DATABASE_NAME);
-        File file = new File(exportDir, OpenScale.DATABASE_NAME);
-
-        if (!exportDir.exists()) {
-            exportDir.mkdirs();
-        }
-
-        try {
-            file.createNewFile();
-            copyFile(dbFile, file);
-
-            Toast.makeText(getActivity(), getResources().getString(R.string.info_data_exported)
-                    +  " " + file.getPath(), Toast.LENGTH_SHORT).show();
-        } catch (IOException e) {
-            Toast.makeText(getActivity(), getResources().getString(R.string.error_exporting)
-                    + " " + e.getMessage(), Toast.LENGTH_SHORT).show();
-            return false;
-        }
+        startActivityForResult(intent, EXPORT_DATA_REQUEST);
 
         return true;
     }
 
-    private void copyFile(File src, File dst) throws IOException {
-        FileChannel inChannel = new FileInputStream(src).getChannel();
-        FileChannel outChannel = new FileOutputStream(dst).getChannel();
-        try {
-            inChannel.transferTo(0, inChannel.size(), outChannel);
-        } finally {
-            if (inChannel != null)
-                inChannel.close();
-            if (outChannel != null)
-                outChannel.close();
-        }
-    }
-
     public void onMyOwnRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
         switch (requestCode) {
             case PermissionHelper.PERMISSIONS_REQUEST_ACCESS_READ_STORAGE:
                 if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                     importBackup();
                 } else {
-                    Toast.makeText(getActivity(), R.string.permission_not_granted, Toast.LENGTH_SHORT).show();
+                    Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.permission_not_granted), Toast.LENGTH_SHORT).show();
                 }
             break;
             case PermissionHelper.PERMISSIONS_REQUEST_ACCESS_WRITE_STORAGE:
                 if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
-                    exportBackup();
+                    if (isAutoBackupAskForPermission) {
+                        autoBackup.setChecked(true);
                     } else {
-                    Toast.makeText(getActivity(), R.string.permission_not_granted, Toast.LENGTH_SHORT).show();
+                        exportBackup();
+                    }
+
+                } else {
+                    if (isAutoBackupAskForPermission) {
+                        autoBackup.setChecked(false);
+                    }
+
+                    Toast.makeText(getActivity().getApplicationContext(), getResources().getString(R.string.permission_not_granted), Toast.LENGTH_SHORT).show();
                 }
             break;
         }

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

@@ -209,6 +209,12 @@
     <string name="label_percent">Percent</string>
     <string name="label_estimated">Estimated</string>
     <string name="label_estimate_measurement_summary">Based on weight, height, age, gender, etc.</string>
+    <string name="label_auto_backup">Auto backup</string>
+    <string name="label_auto_backup_schedule">Backup schedule</string>
+    <string name="label_overwrite_backup">Overwrite previous backup</string>
+    <string name="label_daily">daily</string>
+    <string name="label_weekly">weekly</string>
+    <string name="label_monthly">monthly</string>
     <string name="label_scale_not_supported">Is your scale not supported?</string>
     <string name="label_click_to_help_add_support">Click here to help add support for it</string>
 </resources>

android_app/app/src/main/res/values/type_auto_backup.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources xmlns:tools="http://schemas.android.com/tools" tools:ignore="MissingTranslation">
+    <string-array name="auto_backup_entries">
+        <item>@string/label_daily</item>
+        <item>@string/label_weekly</item>
+        <item>@string/label_monthly</item>
+    </string-array>
+
+    <string-array name="auto_backup_values">
+        <item>Daily</item>
+        <item>Weekly</item>
+        <item>Monthly</item>
+    </string-array>
+
+    <string-array name="auto_backup_default"/>
+</resources>

android_app/app/src/main/res/xml/backup_preferences.xml

@@ -1,6 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
-    <EditTextPreference android:title="@string/label_export_dir" android:key="exportDir" android:defaultValue="openScale backup" />
     <Preference android:title="@string/label_exportBackup" android:key="exportBackup"/>
     <Preference android:title="@string/label_importBackup" android:key="importBackup"/>
+
+    <CheckBoxPreference android:title="@string/label_auto_backup" android:summaryOn="@string/info_is_enable" android:summaryOff="@string/info_is_not_enable" android:key="autoBackup" android:defaultValue="true"/>
+    <CheckBoxPreference android:title="@string/label_overwrite_backup" android:dependency="autoBackup" android:summaryOn="@string/info_is_enable" android:summaryOff="@string/info_is_not_enable" android:key="overwriteBackup" android:defaultValue="false"/>
+    <ListPreference
+        android:dependency="autoBackup"
+        android:entries="@array/auto_backup_entries"
+        android:entryValues="@array/auto_backup_values"
+        android:key="autoBackup_Schedule"
+        android:title="@string/label_auto_backup_schedule"
+        android:defaultValue="Monthly"/>
+    <EditTextPreference android:title="@string/label_export_dir" android:key="exportDir" android:dependency="autoBackup" android:defaultValue="openScale backup" />
 </PreferenceScreen>