Java tutorial
/* Copyright 2015 Aurlien Gteau 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. */ package com.agateau.equiv.ui; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.content.res.Resources; import android.net.Uri; import android.preference.PreferenceManager; import android.support.v4.content.FileProvider; import com.agateau.equiv.R; import com.agateau.equiv.core.Constants; import com.agateau.equiv.core.Consumer; import com.agateau.equiv.core.Day; import com.agateau.equiv.core.DayJsonIO; import com.agateau.equiv.core.Meal; import com.agateau.equiv.core.Product; import com.agateau.equiv.core.ProductStore; import com.agateau.equiv.core.ProductStoreCsvIO; import com.agateau.equiv.core.ProteinWeightUnit; import com.agateau.utils.log.NLog; import org.json.JSONException; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.HashSet; import java.util.Set; import java.util.UUID; /** * Holds all the data */ public class Kernel { private static final String DAY_JSON = "day.json"; private static final String CUSTOM_PRODUCTS_CSV = "custom-products.csv"; private static Kernel sInstance = null; private final Consumer mConsumer = new Consumer(); private final Day mDay = new Day(); private ProductStore mProductStore = null; private ProteinWeightUnit mProteinUnit = ProteinWeightUnit.POTATO; private final WeightFormatter mWeightFormatter; Kernel(Context context) { setupDay(); mWeightFormatter = new WeightFormatter(context.getResources()); } public static Kernel getInstance(Context context) { if (sInstance == null) { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); sInstance = new Kernel(context); sInstance.loadProductList(context); sInstance.loadDay(context); sInstance.updateFromPreferences(prefs); sInstance.readFavorites(prefs); } return sInstance; } public static Kernel getExistingInstance() { return sInstance; } public WeightFormatter getWeightFormatter() { return mWeightFormatter; } public void updateFromPreferences(SharedPreferences prefs) { mProteinUnit = PreferenceUtils.getProteinWeightUnit(prefs, "protein_weight_unit", ProteinWeightUnit.PROTEIN); loadConsumer(prefs); mWeightFormatter.setProteinFormat(mProteinUnit); } private void loadDay(Context context) { NLog.i(""); FileInputStream stream; try { stream = context.openFileInput(DAY_JSON); } catch (FileNotFoundException e) { return; } try { DayJsonIO.read(stream, mDay, mProductStore); stream.close(); } catch (IOException | JSONException e) { NLog.e("Failed to load day: %s", e); } } public void saveDay(Context context) { NLog.i(""); FileOutputStream stream; try { stream = context.openFileOutput(DAY_JSON, Context.MODE_PRIVATE); } catch (FileNotFoundException e) { NLog.e("Failed to open %s for writing: %s", DAY_JSON, e); return; } try { DayJsonIO.write(stream, mDay); stream.flush(); stream.close(); } catch (IOException e) { NLog.e("Failed to save day: %s", e); } } public Consumer getConsumer() { return mConsumer; } public Day getDay() { return mDay; } public ProductStore getProductStore() { return mProductStore; } private void loadProductList(Context context) { InputStream stream; mProductStore = new ProductStore(); try { stream = context.getAssets().open("products.csv"); } catch (IOException e) { throw new RuntimeException("Failed to open products.csv.", e); } try { ProductStoreCsvIO.read(stream, mProductStore, Product.Source.DEFAULT); } catch (IOException e) { throw new RuntimeException("Failed to read products.csv.", e); } try { stream = context.openFileInput(CUSTOM_PRODUCTS_CSV); } catch (FileNotFoundException e) { return; } try { ProductStoreCsvIO.read(stream, mProductStore, Product.Source.CUSTOM); } catch (IOException e) { // Do not throw an exception here, the app is still usable even if we failed to load custom products NLog.e("Failed to read custom products from %s: %s.", CUSTOM_PRODUCTS_CSV, e); } } private void setupDay() { Meal meal = new Meal("breakfast"); mDay.add(meal); meal = new Meal("lunch"); mDay.add(meal); meal = new Meal("snack"); mDay.add(meal); meal = new Meal("dinner"); mDay.add(meal); } private void loadConsumer(SharedPreferences prefs) { mConsumer.setName("Clara"); float maxPerDay = PreferenceUtils.getFloat(prefs, "max_per_day", 250f); float maxProtein; if (mProteinUnit == ProteinWeightUnit.POTATO) { maxProtein = maxPerDay * Constants.PROTEIN_FOR_POTATO; } else { maxProtein = maxPerDay; } mConsumer.setMaxProteinPerDay(maxProtein); } public void saveCustomProductList(Context context) { NLog.i(""); FileOutputStream stream; try { stream = context.openFileOutput(CUSTOM_PRODUCTS_CSV, Context.MODE_PRIVATE); } catch (FileNotFoundException e) { NLog.e("Failed to open %s for writing: %s", CUSTOM_PRODUCTS_CSV, e); return; } try { ProductStoreCsvIO.write(stream, mProductStore.getCustomItems()); stream.flush(); stream.close(); } catch (IOException e) { NLog.e("Failed to save custom productsto %s: %s", CUSTOM_PRODUCTS_CSV, e); } } public void shareCustomProductList(Context context) { File file = context.getFileStreamPath(CUSTOM_PRODUCTS_CSV); Uri contentUri = FileProvider.getUriForFile(context, "com.agateau.equiv.fileprovider", file); final Resources res = context.getResources(); Intent intent = new Intent(Intent.ACTION_SEND); intent.setType("message/rfc822"); intent.putExtra(Intent.EXTRA_EMAIL, new String[] { Constants.CUSTOM_PRODUCTS_EMAIL }); intent.putExtra(Intent.EXTRA_SUBJECT, res.getString(R.string.share_email_subject)); intent.putExtra(Intent.EXTRA_STREAM, contentUri); intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); context.startActivity(Intent.createChooser(intent, res.getString(R.string.share_via))); } public ProteinWeightUnit getProteinUnit() { return mProteinUnit; } private void readFavorites(SharedPreferences prefs) { Set<String> stringSet = prefs.getStringSet("favorites", null); if (stringSet == null) { return; } Set<UUID> favorites = new HashSet<>(); for (String str : stringSet) { favorites.add(UUID.fromString(str)); } mProductStore.setFavoriteUuids(favorites); } public void writeFavorites(Context context) { Set<UUID> favorites = mProductStore.getFavoriteUuids(); Set<String> stringSet = new HashSet<>(); for (UUID uuid : favorites) { stringSet.add(uuid.toString()); } SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); prefs.edit().putStringSet("favorites", stringSet).apply(); } }