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.DialogInterface; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.view.ViewPager; import android.support.v7.app.ActionBar; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.Toast; import com.agateau.equiv.R; import com.agateau.equiv.core.Meal; import com.agateau.utils.log.NLog; import com.agateau.utils.ui.ActionBarViewTabBuilder; public class MainActivity extends AppCompatActivity implements Meal.Listener { private Kernel mKernel; // Home-made state saving, because when the user clicks on Back from the MealItemDetailActivity, // onCreate is always called with a null savedInstanceState, so we can't restore the state. private static class UiState { int currentTabPosition = 0; }; private static UiState sUiState = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); NLog.i(""); PreferenceManager.setDefaultValues(this, R.xml.preferences, false); mKernel = Kernel.getInstance(this); setContentView(R.layout.activity_main); setupTabs(); if (sUiState != null) { getSupportActionBar().getTabAt(sUiState.currentTabPosition).select(); } for (Meal meal : mKernel.getDay().getMeals()) { meal.registerListener(this); } updateTitle(); } @Override protected void onDestroy() { for (Meal meal : mKernel.getDay().getMeals()) { meal.unregisterListener(this); } super.onDestroy(); } private void setupTabs() { final ActionBar actionBar = getSupportActionBar(); actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); ViewPager viewPager = (ViewPager) findViewById(R.id.pager); ActionBarViewTabBuilder builder = new ActionBarViewTabBuilder(actionBar, viewPager); for (Meal meal : mKernel.getDay().getMeals()) { createTabSpec(builder, meal); } } private void createTabSpec(ActionBarViewTabBuilder builder, final Meal meal) { final MealView view = new MealView(this, meal, mKernel.getWeightFormatter()); ActionBar.Tab tab = builder.addTab(view); tab.setTag(meal.getTag()); updateTabText(tab, meal); } @Override protected void onSaveInstanceState(Bundle outState) { if (sUiState == null) { sUiState = new UiState(); } sUiState.currentTabPosition = getSupportActionBar().getSelectedTab().getPosition(); super.onSaveInstanceState(outState); } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.main_activity_actions, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.action_settings) { showSettings(); return true; } else if (id == R.id.action_about) { showAbout(); return true; } else if (id == R.id.action_new_day) { onNewDay(); return true; } else if (id == R.id.action_share) { shareCustomProductList(); return true; } return super.onOptionsItemSelected(item); } @Override public void onMealChanged(Meal meal) { mKernel.saveDay(this); updateTitle(); int tabPosition = mKernel.getDay().getMeals().indexOf(meal); if (tabPosition == -1) { throw new RuntimeException("Meal " + meal + " not in meals"); } ActionBar.Tab tab = getSupportActionBar().getTabAt(tabPosition); updateTabText(tab, meal); } private void showSettings() { SettingsActivity.start(this); } private void showAbout() { AboutActivity.start(this); } private void onNewDay() { new AlertDialog.Builder(this).setTitle(R.string.start_new_day) .setPositiveButton(R.string.start_new_day_button, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { mKernel.getDay().clear(); } }).setNegativeButton(android.R.string.cancel, null).show(); } private void shareCustomProductList() { if (!mKernel.getProductStore().hasCustomItems()) { Toast.makeText(this, R.string.no_custom_products, Toast.LENGTH_SHORT).show(); return; } AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage(getString(R.string.dialog_share_custom_products)) .setPositiveButton(R.string.dialog_share_custom_products_confirm, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialogInterface, int i) { mKernel.shareCustomProductList(MainActivity.this); } }) .setNegativeButton(android.R.string.cancel, null).setCancelable(true).show(); } private void updateTitle() { ActionBar bar = getSupportActionBar(); if (bar == null) { return; } WeightFormatter formatter = mKernel.getWeightFormatter(); String total = formatter.format(mKernel.getDay().getProteinWeight(), WeightFormatter.UnitFormat.NONE); String maxAllowed = formatter.format(mKernel.getConsumer().getMaxProteinPerDay()); String title = String.format("Equiv %s / %s", total, maxAllowed); bar.setTitle(title); } private void updateTabText(ActionBar.Tab tab, Meal meal) { int nameId = getResources().getIdentifier("meal_name_" + meal.getTag(), "string", getPackageName()); String name = getString(nameId); WeightFormatter formatter = mKernel.getWeightFormatter(); String total = formatter.format(meal.getProteinWeight(), WeightFormatter.UnitFormat.SHORT); String title = String.format("%s\n%s", name, total); tab.setText(title); } public void openAddMealItemActivity(View view) { int index = getSupportActionBar().getSelectedNavigationIndex(); Meal meal = mKernel.getDay().getMeals().get(index); MealItemDetailActivity.addMealItem(this, meal); } }