Java tutorial
/* * Copyright (c) 2016 Adventech <info@adventech.io> * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package com.cryart.sabbathschool.viewmodel; import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.content.Context; import android.content.SharedPreferences; import android.databinding.ObservableFloat; import android.databinding.ObservableInt; import android.os.Build; import android.preference.PreferenceManager; import android.support.v4.view.ViewPropertyAnimatorCompat; import android.support.v4.view.animation.LinearOutSlowInInterpolator; import android.util.Log; import android.view.View; import android.view.ViewAnimationUtils; import android.view.animation.Interpolator; import com.crashlytics.android.Crashlytics; import com.cryart.sabbathschool.databinding.SsQuarterliesActivityBinding; import com.cryart.sabbathschool.misc.SSConstants; import com.cryart.sabbathschool.model.SSQuarterly; import com.cryart.sabbathschool.model.SSQuarterlyLanguage; import com.google.firebase.database.DataSnapshot; import com.google.firebase.database.DatabaseError; import com.google.firebase.database.DatabaseReference; import com.google.firebase.database.FirebaseDatabase; import com.google.firebase.database.ValueEventListener; import java.util.ArrayList; import java.util.List; import java.util.Locale; public class SSQuarterliesViewModel implements SSViewModel { private static final String TAG = SSQuarterliesViewModel.class.getSimpleName(); private static final int ANIMATION_DURATION = 300; private Context context; private DataListener dataListener; private List<SSQuarterly> ssQuarterlies; private List<SSQuarterlyLanguage> ssQuarterlyLanguages; private SSQuarterlyLanguage ssQuarterlyLanguage; private DatabaseReference ssFirebaseDatabase; private ValueEventListener ssLanguagesRef; private ValueEventListener ssQuarterliesRef; private String ssDefaultLanguage; private SsQuarterliesActivityBinding ssQuarterliesActivityBinding; public ObservableInt ssQuarterliesLanguageFilterVisibility; public ObservableInt ssQuarterliesLoadingVisibility; public ObservableInt ssQuarterliesListVisibility; public ObservableInt ssQuarterliesErrorMessageVisibility; public ObservableInt ssQuarterliesEmptyStateVisibility; public ObservableInt ssQuarterliesErrorStateVisibility; public ObservableFloat ssQuarterliesListMarginTop; private static final Interpolator INTERPOLATOR = new LinearOutSlowInInterpolator(); private ViewPropertyAnimatorCompat mTranslationAnimator; public SSQuarterliesViewModel(Context context, final DataListener dataListener, SsQuarterliesActivityBinding ssQuarterliesActivityBinding) { this.context = context; this.dataListener = dataListener; this.ssQuarterliesActivityBinding = ssQuarterliesActivityBinding; ssQuarterliesLoadingVisibility = new ObservableInt(View.INVISIBLE); ssQuarterliesListVisibility = new ObservableInt(View.INVISIBLE); ssQuarterliesLanguageFilterVisibility = new ObservableInt(View.GONE); ssQuarterliesErrorMessageVisibility = new ObservableInt(View.INVISIBLE); ssQuarterliesEmptyStateVisibility = new ObservableInt(View.INVISIBLE); ssQuarterliesErrorStateVisibility = new ObservableInt(View.INVISIBLE); ssQuarterliesListMarginTop = new ObservableFloat(0); ssFirebaseDatabase = FirebaseDatabase.getInstance().getReference(); ssFirebaseDatabase.keepSynced(true); this.ssQuarterlyLanguages = new ArrayList<>(); this.ssQuarterlies = new ArrayList<>(); SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); String ssLastLanguageSelected = prefs.getString(SSConstants.SS_LAST_LANGUAGE_INDEX, ""); ssDefaultLanguage = Locale.getDefault().getLanguage(); if (!ssLastLanguageSelected.isEmpty()) { ssDefaultLanguage = ssLastLanguageSelected; } ssQuarterlyLanguage = new SSQuarterlyLanguage(ssDefaultLanguage, getDisplayLanguageByCode(ssDefaultLanguage), 1); loadLanguages(); } private SSQuarterlyLanguage getSelectedLanguage() { return ssQuarterlyLanguage; } private String getDisplayLanguageByCode(String languageCode) { Locale locale = new Locale(languageCode); return org.apache.commons.lang3.StringUtils.capitalize(locale.getDisplayLanguage(Locale.getDefault())); } public void onMenuClick() { final View view = ssQuarterliesActivityBinding.ssLanguageMenu.ssLanguageMenu; final int state = view.getVisibility() == View.VISIBLE ? View.INVISIBLE : View.VISIBLE; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { int centerX = view.getRight(); int centerY = 0; int startRadius = (state == View.VISIBLE) ? 0 : view.getHeight(); int endRadius = (state == View.VISIBLE) ? view.getHeight() : 0; Animator anim = ViewAnimationUtils.createCircularReveal(view, centerX, centerY, startRadius, endRadius); if (state == View.VISIBLE) { view.setVisibility(state); ssQuarterliesActivityBinding.ssLanguageMenuOverlay.setVisibility(state); } else { anim.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { super.onAnimationEnd(animation); view.setVisibility(state); ssQuarterliesActivityBinding.ssLanguageMenuOverlay.setVisibility(state); } }); } anim.start(); } else { view.setVisibility(state); ssQuarterliesActivityBinding.ssLanguageMenuOverlay.setVisibility(state); } } private void loadLanguages() { ssQuarterliesLoadingVisibility.set(View.VISIBLE); ssQuarterliesListVisibility.set(View.INVISIBLE); ssQuarterliesErrorMessageVisibility.set(View.INVISIBLE); ssQuarterliesEmptyStateVisibility.set(View.INVISIBLE); ssQuarterliesErrorStateVisibility.set(View.INVISIBLE); ssLanguagesRef = ssFirebaseDatabase.child(SSConstants.SS_FIREBASE_LANGUAGES_DATABASE) .addValueEventListener(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { if (dataSnapshot != null) { Iterable<DataSnapshot> data = dataSnapshot.getChildren(); try { if (ssQuarterlyLanguages == null) { ssQuarterlyLanguages = new ArrayList<>(); } else { ssQuarterlyLanguages.clear(); } for (DataSnapshot d : data) { SSQuarterlyLanguage _ssQuarterlyLanguage = d .getValue(SSQuarterlyLanguage.class); _ssQuarterlyLanguage.name = getDisplayLanguageByCode(_ssQuarterlyLanguage.code); if (_ssQuarterlyLanguage.code.equalsIgnoreCase(ssDefaultLanguage)) { _ssQuarterlyLanguage.selected = 1; ssQuarterlyLanguage = _ssQuarterlyLanguage; ssQuarterlyLanguages.add(0, _ssQuarterlyLanguage); } else { ssQuarterlyLanguages.add(_ssQuarterlyLanguage); } } if (ssQuarterlyLanguages.size() > 0) { ssQuarterlyLanguage = ssQuarterlyLanguages.get(0); ssQuarterlyLanguage.selected = 1; } if (dataListener != null) dataListener.onQuarterliesLanguagesChanged(ssQuarterlyLanguages); loadQuarterlies(getSelectedLanguage()); } catch (Exception e) { Crashlytics.log(Log.INFO, TAG, e.getMessage()); } } } @Override public void onCancelled(DatabaseError databaseError) { ssQuarterliesErrorMessageVisibility.set(View.VISIBLE); ssQuarterliesListVisibility.set(View.INVISIBLE); ssQuarterliesLoadingVisibility.set(View.INVISIBLE); ssQuarterliesEmptyStateVisibility.set(View.INVISIBLE); ssQuarterliesErrorStateVisibility.set(View.VISIBLE); } }); } private void loadQuarterlies(SSQuarterlyLanguage ssQuarterlyLanguage) { ssQuarterliesRef = ssFirebaseDatabase.child(SSConstants.SS_FIREBASE_QUARTERLIES_DATABASE) .child(ssQuarterlyLanguage.code).addValueEventListener(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { if (dataSnapshot != null) { try { Iterable<DataSnapshot> data = dataSnapshot.getChildren(); if (ssQuarterlies == null) { ssQuarterlies = new ArrayList<>(); } else { ssQuarterlies.clear(); } for (DataSnapshot d : data) { ssQuarterlies.add(d.getValue(SSQuarterly.class)); } if (dataListener != null) dataListener.onQuarterliesChanged(ssQuarterlies); ssQuarterliesListVisibility.set(View.VISIBLE); ssQuarterliesLoadingVisibility.set(View.INVISIBLE); ssQuarterliesErrorMessageVisibility.set(View.INVISIBLE); ssQuarterliesEmptyStateVisibility.set(View.INVISIBLE); ssQuarterliesErrorStateVisibility.set(View.INVISIBLE); if (ssQuarterlies.size() == 0) { ssQuarterliesEmptyStateVisibility.set(View.VISIBLE); } } catch (Exception e) { Crashlytics.log(Log.INFO, TAG, e.getMessage()); } } } @Override public void onCancelled(DatabaseError databaseError) { ssQuarterliesErrorMessageVisibility.set(View.VISIBLE); ssQuarterliesListVisibility.set(View.INVISIBLE); ssQuarterliesLoadingVisibility.set(View.INVISIBLE); ssQuarterliesEmptyStateVisibility.set(View.INVISIBLE); ssQuarterliesErrorStateVisibility.set(View.VISIBLE); } }); } @Override public void destroy() { context = null; dataListener = null; ssQuarterlies = null; ssQuarterlyLanguage = null; ssQuarterlyLanguages = null; if (ssLanguagesRef != null) { ssFirebaseDatabase.removeEventListener(ssLanguagesRef); } if (ssQuarterliesRef != null) { ssFirebaseDatabase.removeEventListener(ssQuarterliesRef); } ssFirebaseDatabase = null; } public void onChangeLanguageEvent(SSQuarterlyLanguage ssQuarterlyLanguage) { this.ssQuarterlyLanguage = ssQuarterlyLanguage; SharedPreferences shared = PreferenceManager.getDefaultSharedPreferences(context); SharedPreferences.Editor editor = shared.edit(); editor.putString(SSConstants.SS_LAST_LANGUAGE_INDEX, ssQuarterlyLanguage.code); editor.apply(); this.loadQuarterlies(getSelectedLanguage()); } public interface DataListener { void onQuarterliesChanged(List<SSQuarterly> ssQuarterlies); void onQuarterliesLanguagesChanged(List<SSQuarterlyLanguage> quarterlyLanguages); } }