Java tutorial
/*** Copyright (c) 2017 CommonsWare, LLC 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. Covered in detail in the book _The Busy Coder's Guide to Android Development_ https://commonsware.com/Android */ package com.commonsware.android.notify.channel; import android.app.Activity; import android.app.Notification; import android.app.NotificationChannel; import android.app.NotificationChannelGroup; import android.app.NotificationManager; import android.content.Intent; import android.graphics.Color; import android.os.Bundle; import android.provider.Settings; import android.support.v4.app.NotificationCompat; import android.view.Menu; import android.view.MenuItem; import android.view.View; import java.util.ArrayList; public class MainActivity extends Activity { private static final String GROUP_UPDATES = "group_updates"; private static final String GROUP_PROMO = "group_promo"; private static final String CHANNEL_CONTENT = "channel_content"; private static final String CHANNEL_BATTLE = "channel_battle"; private static final String CHANNEL_COINS = "channel_coins"; private static final int NOTIF_ID_CONTENT = 1337; private static final int NOTIF_ID_BATTLE = NOTIF_ID_CONTENT + 1; private static final int NOTIF_ID_COINS = NOTIF_ID_CONTENT + 2; private NotificationManager mgr; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mgr = getSystemService(NotificationManager.class); if (mgr.getNotificationChannel(CHANNEL_CONTENT) == null) { initGroups(); initContentChannel(); initBattleChannel(); initCoinsChannel(); } setContentView(R.layout.activity_main); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.actions, menu); return (super.onCreateOptionsMenu(menu)); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == R.id.settings) { Intent i = new Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS); i.putExtra(Settings.EXTRA_CHANNEL_ID, CHANNEL_BATTLE); i.putExtra(Settings.EXTRA_APP_PACKAGE, getPackageName()); startActivity(i); } return super.onOptionsItemSelected(item); } public void raiseContent(View view) { Notification n = new NotificationCompat.Builder(MainActivity.this, CHANNEL_CONTENT) .setContentTitle(getString(R.string.notif_content_title)) .setContentText(getString(R.string.notify_content_text)) .setSmallIcon(android.R.drawable.stat_sys_warning).build(); mgr.notify(NOTIF_ID_CONTENT, n); } public void raiseBattle(View view) { Notification n = new NotificationCompat.Builder(MainActivity.this, CHANNEL_BATTLE) .setContentTitle(getString(R.string.notif_battle_title)) .setContentText(getString(R.string.notif_battle_text)) .setSmallIcon(android.R.drawable.stat_sys_warning).setBadgeIconType(Notification.BADGE_ICON_SMALL) .setColor(Color.RED).setColorized(true).build(); mgr.notify(NOTIF_ID_BATTLE, n); } public void raiseCoins(View view) { Notification n = new NotificationCompat.Builder(MainActivity.this, CHANNEL_COINS) .setContentTitle(getString(R.string.notif_coins_title)) .setContentText(getString(R.string.notif_coins_text)) .setSmallIcon(android.R.drawable.stat_sys_warning).setTimeoutAfter(5000).build(); mgr.notify(NOTIF_ID_COINS, n); } private void initGroups() { ArrayList<NotificationChannelGroup> groups = new ArrayList<>(); groups.add(new NotificationChannelGroup(GROUP_UPDATES, getString(R.string.group_name_updates))); groups.add(new NotificationChannelGroup(GROUP_PROMO, getString(R.string.group_name_promo))); mgr.createNotificationChannelGroups(groups); } private void initContentChannel() { NotificationChannel channel = new NotificationChannel(CHANNEL_CONTENT, getString(R.string.channel_name_content), NotificationManager.IMPORTANCE_LOW); channel.setGroup(GROUP_UPDATES); mgr.createNotificationChannel(channel); } private void initBattleChannel() { NotificationChannel channel = new NotificationChannel(CHANNEL_BATTLE, getString(R.string.channel_name_battle), NotificationManager.IMPORTANCE_HIGH); channel.setGroup(GROUP_UPDATES); channel.setShowBadge(true); mgr.createNotificationChannel(channel); } private void initCoinsChannel() { NotificationChannel channel = new NotificationChannel(CHANNEL_COINS, getString(R.string.channel_name_coins), NotificationManager.IMPORTANCE_DEFAULT); channel.setGroup(GROUP_PROMO); mgr.createNotificationChannel(channel); } }