First try at periodic db export

app/src/main/AndroidManifest.xml

@@ -345,6 +345,12 @@
                 <action android:name="nodomain.freeyourgadget.gadgetbridge.callcontrol" />
             </intent-filter>
         </receiver>
+        <receiver
+            android:enabled="true"
+            android:name="nodomain.freeyourgadget.gadgetbridge.database.PeriodicExporter"
+            android:exported="false">
+
+        </receiver>
 
         <!--
             forcing the DebugActivity to portrait mode avoids crashes with the progress

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/SettingsActivity.java

@@ -22,15 +22,20 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
+import android.database.Cursor;
 import android.location.Criteria;
 import android.location.Location;
 import android.location.LocationListener;
 import android.location.LocationManager;
+import android.net.Uri;
 import android.os.Bundle;
 import android.preference.EditTextPreference;
 import android.preference.ListPreference;
 import android.preference.Preference;
 import android.preference.PreferenceCategory;
+import android.preference.PreferenceManager;
+import android.provider.DocumentsContract;
+import android.provider.OpenableColumns;
 import android.support.v4.app.ActivityCompat;
 import android.support.v4.content.LocalBroadcastManager;
 import android.widget.Toast;
@@ -46,6 +51,7 @@ import java.util.Locale;
 import nodomain.freeyourgadget.gadgetbridge.BuildConfig;
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.R;
+import nodomain.freeyourgadget.gadgetbridge.database.PeriodicExporter;
 import nodomain.freeyourgadget.gadgetbridge.devices.DeviceManager;
 import nodomain.freeyourgadget.gadgetbridge.devices.miband.MiBandPreferencesActivity;
 import nodomain.freeyourgadget.gadgetbridge.model.CannedMessagesSpec;
@@ -64,6 +70,8 @@ public class SettingsActivity extends AbstractSettingsActivity {
 
     public static final String PREF_MEASUREMENT_SYSTEM = "measurement_system";
 
+    private static final int FILE_REQUEST_CODE = 4711;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -262,17 +270,47 @@ public class SettingsActivity extends AbstractSettingsActivity {
 
         pref = findPreference("weather_city");
         pref.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
-            @Override
+           @Override
-            public boolean onPreferenceChange(Preference preference, Object newVal) {
+           public boolean onPreferenceChange(Preference preference, Object newVal) {
-                // reset city id and force a new lookup
+               // reset city id and force a new lookup
-                GBApplication.getPrefs().getPreferences().edit().putString("weather_cityid",null).apply();
+               GBApplication.getPrefs().getPreferences().edit().putString("weather_cityid", null).apply();
-                preference.setSummary(newVal.toString());
+               preference.setSummary(newVal.toString());
-                Intent intent = new Intent("GB_UPDATE_WEATHER");
+               Intent intent = new Intent("GB_UPDATE_WEATHER");
-                intent.setPackage(BuildConfig.APPLICATION_ID);
+               intent.setPackage(BuildConfig.APPLICATION_ID);
-                sendBroadcast(intent);
+               sendBroadcast(intent);
+               return true;
+           }
+        });
+
+        pref = findPreference("export_location");
+        pref.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
+            public boolean onPreferenceClick(Preference preference) {
+                Intent i = new Intent(Intent.ACTION_CREATE_DOCUMENT);
+                i.setType("application/x-sqlite3");
+                i.addCategory(Intent.CATEGORY_OPENABLE);
+                startActivityForResult(Intent.createChooser(i, "Choose directory"), FILE_REQUEST_CODE);
                 return true;
             }
+        });
 
+        pref = findPreference("auto_export_period");
+        pref.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+            @Override
+            public boolean onPreferenceChange(Preference preference, Object auto_export_period) {
+                preference.setSummary(auto_export_period.toString());
+                boolean auto_export_enabled = GBApplication.getPrefs().getBoolean("auto_export_enabled", false);
+                PeriodicExporter.sheduleAlarm(getApplicationContext(), (int) auto_export_period, auto_export_enabled);
+                return true;
+            }
+        });
+
+        findPreference("auto_export_enabled").setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+            @Override
+            public boolean onPreferenceChange(Preference preference, Object autoExportEnabled) {
+                int auto_export_period = GBApplication.getPrefs().getInt("auto_export_period", 0);
+                PeriodicExporter.sheduleAlarm(getApplicationContext(), auto_export_period, (boolean) autoExportEnabled);
+                return true;
+            }
         });
 
         // Get all receivers of Media Buttons
@@ -301,6 +339,36 @@ public class SettingsActivity extends AbstractSettingsActivity {
         audioPlayer.setDefaultValue(newValues[0]);
     }
 
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        if (requestCode == FILE_REQUEST_CODE && data != null) {
+            Uri uri = data.getData();
+            PreferenceManager
+                   .getDefaultSharedPreferences(this)
+                   .edit()
+                   .putString("export_location", uri.toString())
+                   .apply();
+
+            Cursor cursor = getContentResolver().query(
+                    uri,
+                    new String[] { DocumentsContract.Document.COLUMN_DISPLAY_NAME, DocumentsContract.Document.COLUMN_SUMMARY },
+                    null, null, null, null
+            );
+            if (cursor == null || ! cursor.moveToFirst()) {
+                return;
+            }
+            String displayName = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
+            String summary = cursor.getString(cursor.getColumnIndex(DocumentsContract.Document.COLUMN_SUMMARY));
+            LOG.info(displayName + " " + summary);
+            findPreference("export_location").setSummary(displayName);
+            boolean autoExportEnabled = GBApplication
+                    .getPrefs().getBoolean("auto_export_enabled", false);
+            int autoExportPeriod = GBApplication
+                    .getPrefs().getInt("auto_export_period", 0);
+            PeriodicExporter.sheduleAlarm(getApplicationContext(), autoExportPeriod, autoExportEnabled);
+        }
+    }
+
     /*
      * delayed execution so that the preferences are applied first
      */

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/database/DBHelper.java

@@ -21,6 +21,7 @@ import android.content.Context;
 import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteOpenHelper;
+import android.net.Uri;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 
@@ -29,6 +30,7 @@ import org.slf4j.LoggerFactory;
 
 import java.io.File;
 import java.io.IOException;
+import java.io.OutputStream;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
 import java.util.Date;
@@ -118,6 +120,16 @@ public class DBHelper {
         }
     }
 
+    public void exportDB(DBHandler dbHandler, OutputStream dest) throws IOException {
+        String dbPath = getClosedDBPath(dbHandler);
+        try {
+            File source = new File(dbPath);
+            FileUtils.copyFileToStream(source, dest);
+        } finally {
+            dbHandler.openDb();
+        }
+    }
+
     private String getDate() {
         return new SimpleDateFormat("yyyyMMdd-HHmmss", Locale.US).format(new Date());
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/database/PeriodicExporter.java

@@ -0,0 +1,64 @@
+package nodomain.freeyourgadget.gadgetbridge.database;
+
+import android.app.AlarmManager;
+import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.os.SystemClock;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.OutputStream;
+
+import nodomain.freeyourgadget.gadgetbridge.GBApplication;
+
+/**
+ * Created by maufl on 1/4/18.
+ */
+
+public class PeriodicExporter extends BroadcastReceiver {
+    private static final Logger LOG = LoggerFactory.getLogger(PeriodicExporter.class);
+
+
+    public static void sheduleAlarm(Context context, Integer autoExportPeriod, boolean autoExportEnabled) {
+        Intent i = new Intent(context, PeriodicExporter.class);
+        PendingIntent pi = PendingIntent.getBroadcast(context, 0 , i, 0);
+        AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
+        am.cancel(pi);
+        if (!autoExportEnabled) {
+            return;
+        }
+        int exportPeriod = autoExportPeriod * 1000;// * 60 * 60 * 1000;
+        if (exportPeriod == 0) {
+            return;
+        }
+        LOG.info("Enabling periodic export");
+        am.setInexactRepeating(
+                AlarmManager.ELAPSED_REALTIME,
+                SystemClock.elapsedRealtime() + exportPeriod,
+                exportPeriod,
+                pi
+        );
+    }
+
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        LOG.info("Exporting DB");
+        try (DBHandler dbHandler = GBApplication.acquireDB()) {
+            DBHelper helper = new DBHelper(context);
+            String dst = GBApplication.getPrefs().getString("export_location", null);
+            if (dst == null) {
+                LOG.info("Unable to export DB, export locatio not set");
+                return;
+            }
+            Uri dstUri = Uri.parse(dst);
+            OutputStream out = context.getContentResolver().openOutputStream(dstUri);
+            helper.exportDB(dbHandler, out);
+        } catch (Exception ex) {
+            LOG.info("Exception while exporting DB: ", ex);
+        }
+    }
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/FileUtils.java

@@ -18,11 +18,13 @@ package nodomain.freeyourgadget.gadgetbridge.util;
 
 import android.content.ContentResolver;
 import android.content.Context;
+import android.icu.util.Output;
 import android.net.Uri;
 import android.os.Environment;
 import android.support.annotation.NonNull;
 
 import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
 import java.io.BufferedReader;
 import java.io.ByteArrayOutputStream;
 import java.io.File;
@@ -32,6 +34,7 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.io.OutputStream;
 import java.nio.channels.FileChannel;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
@@ -82,6 +85,16 @@ public class FileUtils {
         }
     }
 
+    public static void copyFileToStream(File src, OutputStream dst) throws IOException {
+        try (FileInputStream in = new FileInputStream(src)) {
+            byte[] buf = new byte[4096];
+            while(in.available() > 0) {
+                int bytes = in.read(buf);
+                dst.write(buf, 0, bytes);
+            }
+        }
+    }
+
     public static void copyURItoFile(Context ctx, Uri uri, File destFile) throws IOException {
         if (uri.getPath().equals(destFile.getPath())) {
             return;
@@ -98,6 +111,17 @@ public class FileUtils {
         }
     }
 
+    public static void copyFileToURI(Context context, File src, Uri dst) throws IOException {
+        OutputStream out = context.getContentResolver().openOutputStream(dst);
+        if (out == null) {
+            throw new IOException("Unable to open output stream for " + dst.toString());
+        }
+        try (OutputStream bufOut = new BufferedOutputStream(out)) {
+            copyFileToStream(src, bufOut);
+            bufOut.close();
+        }
+    }
+
     /**
      * Returns the textual contents of the given file. The contents is expected to be
      * in UTF-8 encoding.

app/src/main/res/layout/activity_db_management.xml

@@ -1,4 +1,5 @@
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:grid="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -9,8 +10,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content">
 
-        <android.support.v7.widget.GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
+        <android.support.v7.widget.GridLayout
-            xmlns:grid="http://schemas.android.com/apk/res-auto"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:paddingBottom="@dimen/activity_vertical_margin"
@@ -29,8 +29,8 @@
             <Button
                 android:id="@+id/importDBButton"
                 android:text="Import DB"
-                grid:layout_gravity="center"
+                grid:layout_column="1"
-                grid:layout_column="1" />
+                grid:layout_gravity="center" />
 
 
             <TextView
@@ -50,6 +50,13 @@
                 grid:layout_columnSpan="2"
                 grid:layout_columnWeight="1" />
 
+            <Button
+                android:id="@+id/chooseDirectory"
+                android:text="Choose Directory"
+                grid:layout_columnSpan="2"
+                grid:layout_columnWeight="1"
+                grid:layout_gravity="center" />
+
 
             <TextView
                 android:id="@+id/mergeOldActivityDataTitle"

app/src/main/res/xml/preferences.xml

@@ -101,6 +101,13 @@
             android:defaultValue="true"
             android:key="charts_allow_swipe"
             android:title="@string/pref_title_charts_swipe" />
+        <ListPreference
+            android:defaultValue="metric"
+            android:entries="@array/pref_entries_unit_system"
+            android:entryValues="@array/pref_values_unit_system"
+            android:key="measurement_system"
+            android:summary="%s"
+            android:title="@string/pref_title_unit_system" />
     </PreferenceCategory>
     <PreferenceCategory
         android:key="pref_key_datetime"
@@ -496,6 +503,25 @@
         </PreferenceScreen>
     </PreferenceCategory>
 
+    <PreferenceCategory
+        android:key="database"
+        android:title="Database settings">
+        <Preference
+            android:key="export_location"
+            android:title="Database export location"
+            android:summary="%s" />
+        <CheckBoxPreference
+            android:defaultValue="false"
+            android:key="auto_export_enabled"
+            android:title="Enable periodic export" />
+        <EditTextPreference
+            android:inputType="number"
+            android:key="auto_export_period"
+            android:defaultValue="3"
+            android:maxLength="3"
+            android:title="Export every n hours"
+            android:summary="%n"/>
+    </PreferenceCategory>
     <PreferenceCategory
         android:key="pref_key_development"
         android:title="@string/pref_header_development">