Java tutorial
/* * Copyright (C) 2014 The Android Open Source Project * * 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.example.android.messagingservice; import android.app.PendingIntent; import android.app.Service; import android.content.Intent; import android.graphics.BitmapFactory; import android.os.Handler; import android.os.IBinder; import android.os.Message; import android.os.Messenger; import android.support.v4.app.NotificationCompat.CarExtender; import android.support.v4.app.NotificationCompat.CarExtender.UnreadConversation; import android.support.v4.app.NotificationCompat; import android.support.v4.app.NotificationManagerCompat; import android.support.v4.app.RemoteInput; import android.util.Log; import java.lang.ref.WeakReference; import java.util.Iterator; public class MessagingService extends Service { private static final String TAG = MessagingService.class.getSimpleName(); private static final String EOL = "\n"; private static final String READ_ACTION = "com.example.android.messagingservice.ACTION_MESSAGE_READ"; public static final String REPLY_ACTION = "com.example.android.messagingservice.ACTION_MESSAGE_REPLY"; public static final String CONVERSATION_ID = "conversation_id"; public static final String EXTRA_REMOTE_REPLY = "extra_remote_reply"; public static final int MSG_SEND_NOTIFICATION = 1; private NotificationManagerCompat mNotificationManager; private final Messenger mMessenger = new Messenger(new IncomingHandler(this)); @Override public void onCreate() { Log.d(TAG, "onCreate"); mNotificationManager = NotificationManagerCompat.from(getApplicationContext()); } @Override public IBinder onBind(Intent intent) { Log.d(TAG, "onBind"); return mMessenger.getBinder(); } // Creates an intent that will be triggered when a message is marked as read. private Intent getMessageReadIntent(int id) { return new Intent().addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES).setAction(READ_ACTION) .putExtra(CONVERSATION_ID, id); } // Creates an Intent that will be triggered when a voice reply is received. private Intent getMessageReplyIntent(int conversationId) { return new Intent().addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES).setAction(REPLY_ACTION) .putExtra(CONVERSATION_ID, conversationId); } private void sendNotification(int howManyConversations, int messagesPerConversation) { Conversations.Conversation[] conversations = Conversations.getUnreadConversations(howManyConversations, messagesPerConversation); for (Conversations.Conversation conv : conversations) { sendNotificationForConversation(conv); } } private void sendNotificationForConversation(Conversations.Conversation conversation) { // A pending Intent for reads PendingIntent readPendingIntent = PendingIntent.getBroadcast(getApplicationContext(), conversation.getConversationId(), getMessageReadIntent(conversation.getConversationId()), PendingIntent.FLAG_UPDATE_CURRENT); // Build a RemoteInput for receiving voice input in a Car Notification or text input on // devices that support text input (like devices on Android N and above). RemoteInput remoteInput = new RemoteInput.Builder(EXTRA_REMOTE_REPLY).setLabel(getString(R.string.reply)) .build(); // Building a Pending Intent for the reply action to trigger PendingIntent replyIntent = PendingIntent.getBroadcast(getApplicationContext(), conversation.getConversationId(), getMessageReplyIntent(conversation.getConversationId()), PendingIntent.FLAG_UPDATE_CURRENT); // Build an Android N compatible Remote Input enabled action. NotificationCompat.Action actionReplyByRemoteInput = new NotificationCompat.Action.Builder( R.drawable.notification_icon, getString(R.string.reply), replyIntent).addRemoteInput(remoteInput) .build(); // Create the UnreadConversation and populate it with the participant name, // read and reply intents. UnreadConversation.Builder unreadConvBuilder = new UnreadConversation.Builder( conversation.getParticipantName()).setLatestTimestamp(conversation.getTimestamp()) .setReadPendingIntent(readPendingIntent).setReplyAction(replyIntent, remoteInput); // Note: Add messages from oldest to newest to the UnreadConversation.Builder StringBuilder messageForNotification = new StringBuilder(); for (Iterator<String> messages = conversation.getMessages().iterator(); messages.hasNext();) { String message = messages.next(); unreadConvBuilder.addMessage(message); messageForNotification.append(message); if (messages.hasNext()) { messageForNotification.append(EOL); } } NotificationCompat.Builder builder = new NotificationCompat.Builder(getApplicationContext()) .setSmallIcon(R.drawable.notification_icon) .setLargeIcon(BitmapFactory.decodeResource(getApplicationContext().getResources(), R.drawable.android_contact)) .setContentText(messageForNotification.toString()).setWhen(conversation.getTimestamp()) .setContentTitle(conversation.getParticipantName()).setContentIntent(readPendingIntent) .extend(new CarExtender().setUnreadConversation(unreadConvBuilder.build()) .setColor(getApplicationContext().getResources().getColor(R.color.default_color_light))) .addAction(actionReplyByRemoteInput); MessageLogger.logMessage(getApplicationContext(), "Sending notification " + conversation.getConversationId() + " conversation: " + conversation); mNotificationManager.notify(conversation.getConversationId(), builder.build()); } /** * Handler for incoming messages from clients. */ private static class IncomingHandler extends Handler { private final WeakReference<MessagingService> mReference; IncomingHandler(MessagingService service) { mReference = new WeakReference<>(service); } @Override public void handleMessage(Message msg) { MessagingService service = mReference.get(); switch (msg.what) { case MSG_SEND_NOTIFICATION: int howManyConversations = msg.arg1 <= 0 ? 1 : msg.arg1; int messagesPerConversation = msg.arg2 <= 0 ? 1 : msg.arg2; if (service != null) { service.sendNotification(howManyConversations, messagesPerConversation); } break; default: super.handleMessage(msg); } } } }