Java tutorial
/* * Copyright (C) 2016 Glucosio Foundation * * This file is part of Glucosio. * * Glucosio 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, version 3. * * Glucosio 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 Glucosio. If not, see <http://www.gnu.org/licenses/>. * * */ package org.glucosio.android.presenter; import android.Manifest; import android.app.Activity; import android.content.pm.PackageManager; import android.net.Uri; import android.os.AsyncTask; import android.os.Environment; import android.support.v4.app.ActivityCompat; import android.support.v4.content.FileProvider; import android.util.Log; import org.glucosio.android.db.DatabaseHandler; import org.glucosio.android.db.GlucoseReading; import org.glucosio.android.tools.ReadingToCSV; import org.glucosio.android.view.ExportView; import java.io.File; import java.util.Calendar; import java.util.List; import io.realm.Realm; public class ExportPresenter { // Storage Permissions private static final int REQUEST_EXTERNAL_STORAGE = 1; private static String[] PERMISSIONS_STORAGE = { Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE }; private int fromDay; private int fromMonth; private int fromYear; private int toDay; private int toMonth; private int toYear; private Activity mActivity; private ExportView mExportView; private DatabaseHandler dB; public ExportPresenter(Activity activity, DatabaseHandler databaseHandler) { mActivity = activity; if (activity instanceof ExportView) { mExportView = (ExportView) activity; } else { throw new RuntimeException("ExportPresenter Activity must implement ExportView interface"); } dB = databaseHandler; } public void onExportClicked(final boolean isExportAll) { if (hasStoragePermissions(mActivity)) { final String preferredUnit = dB.getUser(1).getPreferred_unit(); final boolean[] isEmpty = { false }; new AsyncTask<Void, Void, String>() { @Override protected String doInBackground(Void... params) { Realm realm = dB.getNewRealmInstance(); final List<GlucoseReading> readings; if (isExportAll) { readings = dB.getGlucoseReadings(realm); } else { Calendar fromDate = Calendar.getInstance(); fromDate.set(Calendar.YEAR, fromYear); fromDate.set(Calendar.MONTH, fromMonth); fromDate.set(Calendar.DAY_OF_MONTH, fromDay); Calendar toDate = Calendar.getInstance(); toDate.set(Calendar.YEAR, toYear); toDate.set(Calendar.MONTH, toMonth); toDate.set(Calendar.DAY_OF_MONTH, toDay); readings = dB.getGlucoseReadings(realm, fromDate.getTime(), toDate.getTime()); } mExportView.onExportStarted(readings.size()); if (readings.isEmpty()) { isEmpty[0] = true; return null; } if (dirExists()) { Log.i("glucosio", "Dir exists"); return new ReadingToCSV(mActivity, preferredUnit).createCSVFile(realm, readings); } else { Log.i("glucosio", "Dir NOT exists"); return null; } } @Override protected void onPostExecute(String filename) { super.onPostExecute(filename); if (filename != null) { Uri uri = FileProvider.getUriForFile(mActivity.getApplicationContext(), mActivity.getApplicationContext().getPackageName() + ".provider.fileprovider", new File(filename)); mExportView.onExportFinish(uri); } else if (isEmpty[0]) { mExportView.onNoItemsToExport(); } else { mExportView.onExportError(); } } }.execute(); } } private boolean dirExists() { final File file = new File( Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/glucosio"); return file.exists() || file.mkdirs(); } private boolean hasStoragePermissions(Activity activity) { // Check if we have write permission int permission = ActivityCompat.checkSelfPermission(activity, Manifest.permission.WRITE_EXTERNAL_STORAGE); Log.i("Glucosio", "Storage permissions granted."); if (permission != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(activity, PERMISSIONS_STORAGE, REQUEST_EXTERNAL_STORAGE); return false; } else { return true; } } public int getFromDay() { return fromDay; } public void setFromDay(int fromDay) { this.fromDay = fromDay; } public int getFromMonth() { return fromMonth; } public void setFromMonth(int fromMonth) { this.fromMonth = fromMonth; } public int getFromYear() { return fromYear; } public void setFromYear(int fromYear) { this.fromYear = fromYear; } public int getToDay() { return toDay; } public void setToDay(int toDay) { this.toDay = toDay; } public int getToMonth() { return toMonth; } public void setToMonth(int toMonth) { this.toMonth = toMonth; } public int getToYear() { return toYear; } public void setToYear(int toYear) { this.toYear = toYear; } }