Import data from Tickmate and Rewire

Closes #36, closes #41

app/src/main/AndroidManifest.xml

@@ -27,12 +27,10 @@
     <uses-permission android:name="android.permission.VIBRATE"/>
 
     <uses-permission
-        android:name="android.permission.READ_EXTERNAL_STORAGE"
+        android:name="android.permission.READ_EXTERNAL_STORAGE"/>
-        android:maxSdkVersion="18"/>
 
     <uses-permission
-        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
+        android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
-        android:maxSdkVersion="18"/>
 
     <application
         android:name="HabitsApplication"

app/src/main/java/org/isoron/uhabits/MainActivity.java

@@ -19,6 +19,7 @@
 
 package org.isoron.uhabits;
 
+import android.Manifest;
 import android.appwidget.AppWidgetManager;
 import android.content.BroadcastReceiver;
 import android.content.ComponentName;
@@ -26,10 +27,15 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
+import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.os.AsyncTask;
 import android.os.Bundle;
+import android.os.Environment;
 import android.preference.PreferenceManager;
+import android.support.annotation.NonNull;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.content.ContextCompat;
 import android.support.v4.content.LocalBroadcastManager;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -37,6 +43,7 @@ import android.view.MenuItem;
 import org.isoron.helpers.DateHelper;
 import org.isoron.helpers.DialogHelper;
 import org.isoron.helpers.ReplayableActivity;
+import org.isoron.uhabits.dialogs.FilePickerDialog;
 import org.isoron.uhabits.fragments.ListHabitsFragment;
 import org.isoron.uhabits.helpers.ReminderHelper;
 import org.isoron.uhabits.models.Habit;
@@ -46,6 +53,8 @@ import org.isoron.uhabits.widgets.HistoryWidgetProvider;
 import org.isoron.uhabits.widgets.ScoreWidgetProvider;
 import org.isoron.uhabits.widgets.StreakWidgetProvider;
 
+import java.io.File;
+
 public class MainActivity extends ReplayableActivity
         implements ListHabitsFragment.OnHabitClickListener
 {
@@ -120,6 +129,12 @@ public class MainActivity extends ReplayableActivity
     {
         switch (item.getItemId())
         {
+            case R.id.action_import:
+            {
+                onActionImportClicked();
+                return true;
+            }
+
             case R.id.action_settings:
             {
                 Intent intent = new Intent(this, SettingsActivity.class);
@@ -139,6 +154,22 @@ public class MainActivity extends ReplayableActivity
         }
     }
 
+    private void onActionImportClicked()
+    {
+        if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) !=
+                PackageManager.PERMISSION_GRANTED)
+        {
+            if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN)
+                return;
+
+            String[] permissions = new String[]{ Manifest.permission.READ_EXTERNAL_STORAGE };
+            ActivityCompat.requestPermissions(this, permissions, 0);
+            return;
+        }
+
+        listHabitsFragment.showImportDialog();
+    }
+
     @Override
     public void onHabitClicked(Habit habit)
     {
@@ -197,4 +228,14 @@ public class MainActivity extends ReplayableActivity
             listHabitsFragment.onPostExecuteCommand(null);
         }
     }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
+                                           @NonNull int[] grantResults)
+    {
+        if (grantResults.length <= 0) return;
+        if (grantResults[0] != PackageManager.PERMISSION_GRANTED) return;
+
+        listHabitsFragment.showImportDialog();
+    }
 }

app/src/main/java/org/isoron/uhabits/dialogs/FilePickerDialog.java

@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker 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.
+ *
+ * Loop Habit Tracker 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 org.isoron.uhabits.dialogs;
+
+import android.app.Activity;
+import android.app.Dialog;
+import android.support.annotation.NonNull;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.WindowManager.LayoutParams;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.ListView;
+import android.widget.TextView;
+
+import java.io.File;
+import java.io.FileFilter;
+import java.util.Arrays;
+
+public class FilePickerDialog implements AdapterView.OnItemClickListener
+{
+    private static final String PARENT_DIR = "..";
+
+    private final Activity activity;
+    private ListView list;
+    private Dialog dialog;
+    private File currentPath;
+
+    public interface OnFileSelectedListener
+    {
+        void onFileSelected(File file);
+    }
+
+    private OnFileSelectedListener fileListener;
+
+    public FilePickerDialog(Activity activity, File initialDirectory)
+    {
+        this.activity = activity;
+
+        list = new ListView(activity);
+        list.setOnItemClickListener(this);
+
+        dialog = new Dialog(activity);
+        dialog.setContentView(list);
+        dialog.getWindow().setLayout(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
+
+        navigateTo(initialDirectory);
+    }
+
+    @Override
+    public void onItemClick(AdapterView<?> parent, View view, int which, long id)
+    {
+        String filename = (String) list.getItemAtPosition(which);
+        File file;
+
+        if (filename.equals(PARENT_DIR))
+            file = currentPath.getParentFile();
+        else
+            file = new File(currentPath, filename);
+
+        if (file.isDirectory())
+        {
+            navigateTo(file);
+        }
+        else
+        {
+            if (fileListener != null) fileListener.onFileSelected(file);
+            dialog.dismiss();
+        }
+    }
+
+    public void show()
+    {
+        dialog.show();
+    }
+
+    public void setFileListener(OnFileSelectedListener fileListener)
+    {
+        this.fileListener = fileListener;
+    }
+
+    private void navigateTo(File path)
+    {
+        if (!path.exists()) return;
+
+        File[] dirs = path.listFiles(new ReadableDirFilter());
+        File[] files = path.listFiles(new RegularReadableFileFilter());
+        if(dirs == null || files == null) return;
+
+        this.currentPath = path;
+        dialog.setTitle(currentPath.getPath());
+        list.setAdapter(new FilePickerAdapter(getFileList(path, dirs, files)));
+    }
+
+    @NonNull
+    private String[] getFileList(File path, File[] dirs, File[] files)
+    {
+        int count = 0;
+        int length = dirs.length + files.length;
+        String[] fileList;
+
+        if (path.getParentFile() == null || !path.getParentFile().canRead())
+        {
+            fileList = new String[length];
+        }
+        else
+        {
+            fileList = new String[length + 1];
+            fileList[count++] = PARENT_DIR;
+        }
+
+        Arrays.sort(dirs);
+        Arrays.sort(files);
+
+        for (File dir : dirs)
+            fileList[count++] = dir.getName();
+
+        for (File file : files)
+            fileList[count++] = file.getName();
+
+        return fileList;
+    }
+
+    private class FilePickerAdapter extends ArrayAdapter<String>
+    {
+        public FilePickerAdapter(@NonNull String[] fileList)
+        {
+            super(FilePickerDialog.this.activity, android.R.layout.simple_list_item_1, fileList);
+        }
+
+        @Override
+        public View getView(int pos, View view, ViewGroup parent)
+        {
+            view = super.getView(pos, view, parent);
+            TextView tv = (TextView) view;
+            tv.setSingleLine(true);
+            return view;
+        }
+    }
+
+    private static class ReadableDirFilter implements FileFilter
+    {
+        @Override
+        public boolean accept(File file)
+        {
+            return (file.isDirectory() && file.canRead());
+        }
+    }
+
+    private class RegularReadableFileFilter implements FileFilter
+    {
+        @Override
+        public boolean accept(File file)
+        {
+            return !file.isDirectory() && file.canRead();
+        }
+    }
+}

app/src/main/java/org/isoron/uhabits/fragments/ImportHabitsAsyncTask.java

@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker 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.
+ *
+ * Loop Habit Tracker 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 org.isoron.uhabits.fragments;
+
+import android.os.AsyncTask;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.view.View;
+import android.widget.ProgressBar;
+
+import org.isoron.uhabits.io.GenericImporter;
+
+import java.io.File;
+import java.io.IOException;
+
+public class ImportHabitsAsyncTask extends AsyncTask<Void, Void, Void>
+{
+    public static final int SUCCESS = 1;
+    public static final int NOT_RECOGNIZED = 2;
+    public static final int FAILED = 3;
+
+    public interface Listener
+    {
+        void onImportFinished(int result);
+    }
+
+    @Nullable
+    private final ProgressBar progressBar;
+
+    @NonNull
+    private final File file;
+
+    @Nullable
+    private Listener listener;
+
+    int result;
+
+    public ImportHabitsAsyncTask(@NonNull File file, @Nullable ProgressBar progressBar)
+    {
+        this.file = file;
+        this.progressBar = progressBar;
+    }
+
+    public void setListener(@Nullable Listener listener)
+    {
+        this.listener = listener;
+    }
+
+    @Override
+    protected void onPreExecute()
+    {
+        if(progressBar != null)
+        {
+            progressBar.setIndeterminate(true);
+            progressBar.setVisibility(View.VISIBLE);
+        }
+    }
+
+    @Override
+    protected void onPostExecute(Void aVoid)
+    {
+        if(progressBar != null)
+            progressBar.setVisibility(View.GONE);
+
+        if(listener != null) listener.onImportFinished(result);
+    }
+
+    @Override
+    protected Void doInBackground(Void... params)
+    {
+        try
+        {
+            GenericImporter importer = new GenericImporter();
+            if(importer.canHandle(file))
+            {
+                importer.importHabitsFromFile(file);
+                result = SUCCESS;
+            }
+            else
+            {
+                result = NOT_RECOGNIZED;
+            }
+        }
+        catch (IOException e)
+        {
+            result = FAILED;
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+}

app/src/main/java/org/isoron/uhabits/fragments/ListHabitsFragment.java

@@ -25,6 +25,7 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.net.Uri;
 import android.os.Bundle;
+import android.os.Environment;
 import android.preference.PreferenceManager;
 import android.view.ActionMode;
 import android.view.ContextMenu;
@@ -55,6 +56,7 @@ import org.isoron.helpers.DialogHelper.OnSavedListener;
 import org.isoron.helpers.ReplayableActivity;
 import org.isoron.uhabits.R;
 import org.isoron.uhabits.commands.ToggleRepetitionCommand;
+import org.isoron.uhabits.dialogs.FilePickerDialog;
 import org.isoron.uhabits.dialogs.HabitSelectionCallback;
 import org.isoron.uhabits.dialogs.HintManager;
 import org.isoron.uhabits.helpers.ListHabitsHelper;
@@ -62,6 +64,7 @@ import org.isoron.uhabits.helpers.ReminderHelper;
 import org.isoron.uhabits.loaders.HabitListLoader;
 import org.isoron.uhabits.models.Habit;
 
+import java.io.File;
 import java.util.Date;
 import java.util.LinkedList;
 import java.util.List;
@@ -69,7 +72,7 @@ import java.util.List;
 public class ListHabitsFragment extends Fragment
         implements OnSavedListener, OnItemClickListener, OnLongClickListener, DropListener,
         OnClickListener, HabitListLoader.Listener, AdapterView.OnItemLongClickListener,
-        HabitSelectionCallback.Listener
+        HabitSelectionCallback.Listener, ImportHabitsAsyncTask.Listener
 {
     long lastLongClick = 0;
     private boolean isShortToggleEnabled;
@@ -426,4 +429,41 @@ public class ListHabitsFragment extends Fragment
             selectItem(position);
         }
     }
+
+    public void showImportDialog()
+    {
+        File dir = Environment.getExternalStorageDirectory();
+        FilePickerDialog picker = new FilePickerDialog(activity, dir);
+        picker.setFileListener(new FilePickerDialog.OnFileSelectedListener()
+        {
+            @Override
+            public void onFileSelected(File file)
+            {
+                ImportHabitsAsyncTask task = new ImportHabitsAsyncTask(file, progressBar);
+                task.setListener(ListHabitsFragment.this);
+                task.execute();
+            }
+        });
+        picker.show();
+    }
+
+    @Override
+    public void onImportFinished(int result)
+    {
+        switch (result)
+        {
+            case ImportHabitsAsyncTask.SUCCESS:
+                loader.updateAllHabits(true);
+                activity.showToast(R.string.habits_imported);
+                break;
+
+            case ImportHabitsAsyncTask.NOT_RECOGNIZED:
+                activity.showToast(R.string.file_not_recognized);
+                break;
+
+            default:
+                activity.showToast(R.string.could_not_import);
+                break;
+        }
+    }
 }

app/src/main/java/org/isoron/uhabits/io/AbstractImporter.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker 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.
+ *
+ * Loop Habit Tracker 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 org.isoron.uhabits.io;
+
+import android.support.annotation.NonNull;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.Arrays;
+
+public abstract class AbstractImporter
+{
+    public abstract boolean canHandle(@NonNull File file) throws IOException;
+
+    public abstract void importHabitsFromFile(@NonNull File file) throws IOException;
+
+    public static boolean isSQLite3File(@NonNull File file) throws IOException
+    {
+        FileInputStream fis = new FileInputStream(file);
+
+        byte[] sqliteHeader = "SQLite format 3".getBytes();
+        byte[] buffer = new byte[sqliteHeader.length];
+
+
+        int count = fis.read(buffer);
+        if(count < sqliteHeader.length) return false;
+
+        return Arrays.equals(buffer, sqliteHeader);
+    }
+}

app/src/main/java/org/isoron/uhabits/io/GenericImporter.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker 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.
+ *
+ * Loop Habit Tracker 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 org.isoron.uhabits.io;
+
+import android.support.annotation.NonNull;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.LinkedList;
+import java.util.List;
+
+public class GenericImporter extends AbstractImporter
+{
+    List<AbstractImporter> importers;
+
+    public GenericImporter()
+    {
+        importers = new LinkedList<>();
+        importers.add(new RewireDBImporter());
+        importers.add(new TickmateDBImporter());
+    }
+
+    @Override
+    public boolean canHandle(@NonNull File file) throws IOException
+    {
+        for(AbstractImporter importer : importers)
+            if(importer.canHandle(file)) return true;
+
+        return false;
+    }
+
+    @Override
+    public void importHabitsFromFile(@NonNull File file) throws IOException
+    {
+        for(AbstractImporter importer : importers)
+            if(importer.canHandle(file))
+                importer.importHabitsFromFile(file);
+    }
+}

app/src/main/java/org/isoron/uhabits/io/RewireDBImporter.java

@@ -0,0 +1,190 @@
+/*
+ * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker 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.
+ *
+ * Loop Habit Tracker 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 org.isoron.uhabits.io;
+
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.support.annotation.NonNull;
+
+import org.isoron.helpers.ActiveAndroidHelper;
+import org.isoron.helpers.DateHelper;
+import org.isoron.uhabits.models.Habit;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.GregorianCalendar;
+
+public class RewireDBImporter extends AbstractImporter
+{
+    @Override
+    public boolean canHandle(@NonNull File file) throws IOException
+    {
+        if(!isSQLite3File(file)) return false;
+
+        SQLiteDatabase db = SQLiteDatabase.openDatabase(file.getPath(), null,
+                SQLiteDatabase.OPEN_READONLY);
+
+        Cursor c = db.rawQuery("select count(*) from SQLITE_MASTER where name=? or name=?",
+                new String[]{"CHECKINS", "UNIT"});
+
+        boolean result = (c.moveToFirst() && c.getInt(0) == 2);
+
+        c.close();
+        return result;
+    }
+
+    @Override
+    public void importHabitsFromFile(@NonNull File file) throws IOException
+    {
+        final SQLiteDatabase db = SQLiteDatabase.openDatabase(file.getPath(), null,
+                SQLiteDatabase.OPEN_READONLY);
+
+        ActiveAndroidHelper.executeAsTransaction(new ActiveAndroidHelper.Command()
+        {
+            @Override
+            public void execute()
+            {
+                createHabits(db);
+            }
+        });
+    }
+
+    private void createHabits(SQLiteDatabase db)
+    {
+        Cursor c = null;
+
+        try
+        {
+            c = db.rawQuery("select _id, name, description, schedule, active_days, " +
+                    "repeating_count, days, period from habits", new String[0]);
+            if (!c.moveToFirst()) return;
+
+            do
+            {
+                int id = c.getInt(0);
+                String name = c.getString(1);
+                String description = c.getString(2);
+                int schedule = c.getInt(3);
+                String activeDays = c.getString(4);
+                int repeatingCount = c.getInt(5);
+                int days = c.getInt(6);
+                int periodIndex = c.getInt(7);
+
+                Habit habit = new Habit();
+                habit.name = name;
+                habit.description = description;
+
+                int periods[] = { 7, 31, 365 };
+
+                switch (schedule)
+                {
+                    case 0:
+                        habit.freqNum = activeDays.split(",").length;
+                        habit.freqDen = 7;
+                        break;
+
+                    case 1:
+                        habit.freqNum = days;
+                        habit.freqDen = periods[periodIndex];
+                        break;
+
+                    case 2:
+                        habit.freqNum = 1;
+                        habit.freqDen = repeatingCount;
+                        break;
+                }
+
+                habit.save();
+
+                createReminder(db, habit, id);
+                createCheckmarks(db, habit, id);
+
+            }
+            while (c.moveToNext());
+        }
+        finally
+        {
+            if (c != null) c.close();
+        }
+    }
+
+    private void createReminder(SQLiteDatabase db, Habit habit, int rewireHabitId)
+    {
+        String[] params = { Integer.toString(rewireHabitId) };
+        Cursor c = null;
+
+        try
+        {
+            c = db.rawQuery("select time, active_days from reminders where habit_id=? limit 1", params);
+
+            if (!c.moveToFirst()) return;
+            int rewireReminder = Integer.parseInt(c.getString(0));
+            if (rewireReminder <= 0 || rewireReminder >= 1440) return;
+
+            boolean reminderDays[] = new boolean[7];
+
+            String activeDays[] = c.getString(1).split(",");
+            for(String d : activeDays)
+            {
+                int idx = (Integer.parseInt(d) + 1) % 7;
+                reminderDays[idx] = true;
+            }
+
+            habit.reminderDays = DateHelper.packWeekdayList(reminderDays);
+            habit.reminderHour = rewireReminder / 60;
+            habit.reminderMin = rewireReminder % 60;
+            habit.save();
+        }
+        finally
+        {
+            if(c != null) c.close();
+        }
+    }
+
+    private void createCheckmarks(@NonNull SQLiteDatabase db, @NonNull Habit habit, int rewireHabitId)
+    {
+        Cursor c = null;
+
+        try
+        {
+            String[] params = { Integer.toString(rewireHabitId) };
+            c = db.rawQuery("select distinct date from checkins where habit_id=? and type=2", params);
+            if (!c.moveToFirst()) return;
+
+            do
+            {
+                String date = c.getString(0);
+                int year = Integer.parseInt(date.substring(0, 4));
+                int month = Integer.parseInt(date.substring(4, 6));
+                int day = Integer.parseInt(date.substring(6, 8));
+
+                GregorianCalendar cal = DateHelper.getStartOfTodayCalendar();
+                cal.set(year, month - 1, day);
+
+                habit.repetitions.toggle(cal.getTimeInMillis());
+            }
+            while (c.moveToNext());
+        }
+        finally
+        {
+            if (c != null) c.close();
+        }
+    }
+}

app/src/main/java/org/isoron/uhabits/io/TickmateDBImporter.java

@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
+ *
+ * This file is part of Loop Habit Tracker.
+ *
+ * Loop Habit Tracker 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.
+ *
+ * Loop Habit Tracker 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 org.isoron.uhabits.io;
+
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+import android.support.annotation.NonNull;
+
+import org.isoron.helpers.ActiveAndroidHelper;
+import org.isoron.helpers.DateHelper;
+import org.isoron.uhabits.models.Habit;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.GregorianCalendar;
+
+public class TickmateDBImporter extends AbstractImporter
+{
+    @Override
+    public boolean canHandle(@NonNull File file) throws IOException
+    {
+        if(!isSQLite3File(file)) return false;
+
+        SQLiteDatabase db = SQLiteDatabase.openDatabase(file.getPath(), null,
+                SQLiteDatabase.OPEN_READONLY);
+
+        Cursor c = db.rawQuery("select count(*) from SQLITE_MASTER where name=? or name=?",
+                new String[]{"tracks", "track2groups"});
+
+        boolean result = (c.moveToFirst() && c.getInt(0) == 2);
+
+        c.close();
+        return result;
+    }
+
+    @Override
+    public void importHabitsFromFile(@NonNull File file) throws IOException
+    {
+        final SQLiteDatabase db = SQLiteDatabase.openDatabase(file.getPath(), null,
+                SQLiteDatabase.OPEN_READONLY);
+
+        ActiveAndroidHelper.executeAsTransaction(new ActiveAndroidHelper.Command()
+        {
+            @Override
+            public void execute()
+            {
+                createHabits(db);
+            }
+        });
+    }
+
+    private void createHabits(SQLiteDatabase db)
+    {
+        Cursor c = null;
+
+        try
+        {
+            c = db.rawQuery("select _id, name, description from tracks", new String[0]);
+            if (!c.moveToFirst()) return;
+
+            do
+            {
+                int id = c.getInt(0);
+                String name = c.getString(1);
+                String description = c.getString(2);
+
+                Habit habit = new Habit();
+                habit.name = name;
+                habit.description = description;
+                habit.freqNum = 1;
+                habit.freqDen = 1;
+                habit.save();
+
+                createCheckmarks(db, habit, id);
+
+            }
+            while (c.moveToNext());
+        }
+        finally
+        {
+            if (c != null) c.close();
+        }
+    }
+
+    private void createCheckmarks(@NonNull SQLiteDatabase db, @NonNull Habit habit, int tickmateTrackId)
+    {
+        Cursor c = null;
+
+        try
+        {
+            String[] params = { Integer.toString(tickmateTrackId) };
+            c = db.rawQuery("select distinct year, month, day from ticks where _track_id=?", params);
+            if (!c.moveToFirst()) return;
+
+            do
+            {
+                int year = c.getInt(0);
+                int month = c.getInt(1);
+                int day = c.getInt(2);
+
+                GregorianCalendar cal = DateHelper.getStartOfTodayCalendar();
+                cal.set(year, month, day);
+
+                habit.repetitions.toggle(cal.getTimeInMillis());
+            }
+            while (c.moveToNext());
+        }
+        finally
+        {
+            if (c != null) c.close();
+        }
+    }
+}

app/src/main/res/menu/list_habits_menu.xml

@@ -28,6 +28,12 @@
         android:enabled="true"
         android:title="@string/show_archived"/>
 
+    <item
+        android:id="@+id/action_import"
+        android:orderInCategory="50"
+        android:title="Import data"
+        app:showAsAction="never"/>
+
     <item
         android:id="@+id/action_settings"
         android:orderInCategory="100"

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

@@ -139,4 +139,7 @@
     <string name="custom_frequency">Custom …</string>
     <string name="help">Help &amp; FAQ</string>
     <string name="could_not_export">Failed to export data.</string>
+    <string name="could_not_import">Failed to import habits from file.</string>
+    <string name="file_not_recognized">File type not recognized.</string>
+    <string name="habits_imported">Habits imported successfully.</string>
 </resources>

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

@@ -40,6 +40,25 @@
 
     </PreferenceCategory>
 
+    <PreferenceCategory
+        android:key="pref_key_links"
+        android:title="Database">
+
+        <Preference android:title="Export data">
+            <intent
+                android:action="android.intent.action.VIEW"
+                android:data="@string/helpURL"/>
+        </Preference>
+
+        <Preference android:title="Import data"
+            android:summary="Supports files exported by Loop, Tickmate, HabitBull or Rewire. This feature is currently experimental.">
+            <intent
+                android:action="android.intent.action.VIEW"
+                android:data="@string/helpURL"/>
+        </Preference>
+
+    </PreferenceCategory>
+
     <PreferenceCategory
         android:key="pref_key_links"
         android:title="@string/links">