Java tutorial
package com.dm.wallpaper.board.fragments.dialogs; import android.app.Dialog; import android.content.DialogInterface; import android.os.AsyncTask; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.app.DialogFragment; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.util.Log; import android.widget.ListView; import com.afollestad.materialdialogs.MaterialDialog; import com.dm.wallpaper.board.R; import com.dm.wallpaper.board.R2; import com.dm.wallpaper.board.adapters.LanguagesAdapter; import com.dm.wallpaper.board.helpers.LocaleHelper; import com.dm.wallpaper.board.items.Language; import com.dm.wallpaper.board.preferences.Preferences; import com.dm.wallpaper.board.utils.LogUtil; import java.util.List; import java.util.Locale; import butterknife.BindView; import butterknife.ButterKnife; /* * Wallpaper Board * * Copyright (c) 2017 Dani Mahardhika * * 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. */ public class LanguagesFragment extends DialogFragment { @BindView(R2.id.listview) ListView mListView; private Locale mLocale; private AsyncTask<Void, Void, Boolean> mGetLanguages; public static final String TAG = "com.dm.wallpaper.board.dialog.languages"; private static LanguagesFragment newInstance() { return new LanguagesFragment(); } public static void showLanguageChooser(@NonNull FragmentManager fm) { FragmentTransaction ft = fm.beginTransaction(); Fragment prev = fm.findFragmentByTag(TAG); if (prev != null) { ft.remove(prev); } try { DialogFragment dialog = LanguagesFragment.newInstance(); dialog.show(ft, TAG); } catch (IllegalArgumentException | IllegalStateException ignored) { } } @NonNull @Override public Dialog onCreateDialog(Bundle savedInstanceState) { MaterialDialog.Builder builder = new MaterialDialog.Builder(getActivity()); builder.customView(R.layout.fragment_languages, false); builder.typeface("Font-Medium.ttf", "Font-Regular.ttf"); builder.title(R.string.pref_language_header); MaterialDialog dialog = builder.build(); dialog.show(); ButterKnife.bind(this, dialog); return dialog; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); getLanguages(); } @Override public void onDismiss(DialogInterface dialog) { if (mLocale != null) { Preferences.get(getActivity()).setCurrentLocale(mLocale.toString()); LocaleHelper.setLocale(getActivity()); getActivity().recreate(); } if (mGetLanguages != null) mGetLanguages.cancel(true); super.onDismiss(dialog); } public void setLanguage(@NonNull Locale locale) { mLocale = locale; dismiss(); } private void getLanguages() { mGetLanguages = new AsyncTask<Void, Void, Boolean>() { List<Language> languages; int index = 0; @Override protected Boolean doInBackground(Void... voids) { while (!isCancelled()) { try { Thread.sleep(1); languages = LocaleHelper.getAvailableLanguages(getActivity()); Locale locale = Preferences.get(getActivity()).getCurrentLocale(); for (int i = 0; i < languages.size(); i++) { Locale l = languages.get(i).getLocale(); if (l.toString().equals(locale.toString())) { index = i; break; } } return true; } catch (Exception e) { LogUtil.e(Log.getStackTraceString(e)); return false; } } return false; } @Override protected void onPostExecute(Boolean aBoolean) { super.onPostExecute(aBoolean); if (aBoolean) { mListView.setAdapter(new LanguagesAdapter(getActivity(), languages, index)); } else { dismiss(); } mGetLanguages = null; } }.execute(); } }