Java tutorial
/* * Copyright 2015 Synced Synapse. All rights reserved. * * 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.syncedsynapse.kore2.service; import android.annotation.TargetApi; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.app.Service; import android.content.Context; import android.content.Intent; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.drawable.Drawable; import android.os.Build; import android.os.IBinder; import android.support.v4.app.NotificationCompat; import android.support.v4.app.TaskStackBuilder; import android.view.View; import android.widget.RemoteViews; import com.squareup.picasso.Picasso; import com.squareup.picasso.Target; import com.syncedsynapse.kore2.R; import com.syncedsynapse.kore2.host.HostConnectionObserver; import com.syncedsynapse.kore2.host.HostManager; import com.syncedsynapse.kore2.jsonrpc.type.ListType; import com.syncedsynapse.kore2.jsonrpc.type.PlayerType; import com.syncedsynapse.kore2.ui.RemoteActivity; import com.syncedsynapse.kore2.utils.CharacterDrawable; import com.syncedsynapse.kore2.utils.LogUtils; import com.syncedsynapse.kore2.utils.UIUtils; import com.syncedsynapse.kore2.utils.Utils; /** * This service maintains a notification in the notification area while * something is playing, and keeps running while it is playing. * This service stops itself as soon as the playing stops or there's no * connection. Thus, this should only be started if something is already * playing, otherwise it will shutdown automatically. * It doesn't try to mirror Kodi's state at all times, because that would * imply running at all times which can be resource consuming. * * A {@link HostConnectionObserver} singleton is used to keep track of Kodi's * state. This singleton should be the same as used in the app's activities */ public class NotificationService extends Service implements HostConnectionObserver.PlayerEventsObserver { public static final String TAG = LogUtils.makeLogTag(NotificationService.class); private static final int NOTIFICATION_ID = 1; private HostConnectionObserver mHostConnectionObserver = null; private PendingIntent mRemoteStartPendingIntent; @Override public void onCreate() { // We do not create any thread because all the works is supposed to // be done on the main thread, so that the connection observer // can be shared with the app, and notify it on the UI thread LogUtils.LOGD(TAG, "onCreate"); // Create the intent to start the remote when the user taps the notification TaskStackBuilder stackBuilder = TaskStackBuilder.create(this); stackBuilder.addParentStack(RemoteActivity.class); stackBuilder.addNextIntent(new Intent(this, RemoteActivity.class)); mRemoteStartPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT); } @Override public int onStartCommand(Intent intent, int flags, int startId) { LogUtils.LOGD(TAG, "onStartCommand"); // Get the connection observer here, not on create to check if // there has been a change in hosts, and if so unregister the previous one HostConnectionObserver connectionObserver = HostManager.getInstance(this).getHostConnectionObserver(); // If we are already initialized and the same host, exit if (mHostConnectionObserver == connectionObserver) { LogUtils.LOGD(TAG, "Already initialized"); return START_STICKY; } // If there's a change in hosts, unregister from the previous one if (mHostConnectionObserver != null) { mHostConnectionObserver.unregisterPlayerObserver(this); } // Register us on the connection observer mHostConnectionObserver = connectionObserver; mHostConnectionObserver.registerPlayerObserver(this, true); // If we get killed, after returning from here, don't restart return START_STICKY; } @Override public IBinder onBind(Intent intent) { // We don't provide binding, so return null return null; } @Override public void onTaskRemoved(Intent rootIntent) { // Gracefully stop removeNotification(); LogUtils.LOGD(TAG, "Shutting down notification service - Task removed"); mHostConnectionObserver.unregisterPlayerObserver(this); stopSelf(); } /** * HostConnectionObserver.PlayerEventsObserver interface callbacks */ public void playerOnPlay(PlayerType.GetActivePlayersReturnType getActivePlayerResult, PlayerType.PropertyValue getPropertiesResult, ListType.ItemsAll getItemResult) { buildNotification(getActivePlayerResult, getPropertiesResult, getItemResult); } public void playerOnPause(PlayerType.GetActivePlayersReturnType getActivePlayerResult, PlayerType.PropertyValue getPropertiesResult, ListType.ItemsAll getItemResult) { buildNotification(getActivePlayerResult, getPropertiesResult, getItemResult); } public void playerOnStop() { removeNotification(); // Stop service LogUtils.LOGD(TAG, "Shutting down notification service - Player stopped"); mHostConnectionObserver.unregisterPlayerObserver(this); stopSelf(); } public void playerNoResultsYet() { removeNotification(); } public void playerOnConnectionError(int errorCode, String description) { removeNotification(); // Stop service LogUtils.LOGD(TAG, "Shutting down notification service - Connection error"); mHostConnectionObserver.unregisterPlayerObserver(this); stopSelf(); } public void systemOnQuit() { removeNotification(); // Stop service LogUtils.LOGD(TAG, "Shutting down notification service - System quit"); mHostConnectionObserver.unregisterPlayerObserver(this); stopSelf(); } // Ignore this public void inputOnInputRequested(String title, String type, String value) { } public void observerOnStopObserving() { // Called when the user changes host removeNotification(); LogUtils.LOGD(TAG, "Shutting down notification service - System quit"); stopSelf(); } // Picasso target that will be used to load images private static Target picassoTarget = null; @TargetApi(Build.VERSION_CODES.JELLY_BEAN) private void buildNotification(PlayerType.GetActivePlayersReturnType getActivePlayerResult, PlayerType.PropertyValue getPropertiesResult, ListType.ItemsAll getItemResult) { final String title, underTitle, poster; int smallIcon, playPauseIcon, rewindIcon, ffIcon; boolean isVideo = ((getItemResult.type.equals(ListType.ItemsAll.TYPE_MOVIE)) || (getItemResult.type.equals(ListType.ItemsAll.TYPE_EPISODE))); switch (getItemResult.type) { case ListType.ItemsAll.TYPE_MOVIE: title = getItemResult.title; underTitle = getItemResult.tagline; poster = getItemResult.thumbnail; smallIcon = R.drawable.ic_movie_white_24dp; break; case ListType.ItemsAll.TYPE_EPISODE: title = getItemResult.title; String seasonEpisode = String.format(getString(R.string.season_episode_abbrev), getItemResult.season, getItemResult.episode); underTitle = String.format("%s | %s", getItemResult.showtitle, seasonEpisode); poster = getItemResult.art.poster; smallIcon = R.drawable.ic_tv_white_24dp; break; case ListType.ItemsAll.TYPE_SONG: title = getItemResult.title; underTitle = getItemResult.displayartist + " | " + getItemResult.album; poster = getItemResult.thumbnail; smallIcon = R.drawable.ic_headset_white_24dp; break; case ListType.ItemsAll.TYPE_MUSIC_VIDEO: title = getItemResult.title; underTitle = Utils.listStringConcat(getItemResult.artist, ", ") + " | " + getItemResult.album; poster = getItemResult.thumbnail; smallIcon = R.drawable.ic_headset_white_24dp; break; default: // We don't know what this is, forget it return; } switch (getPropertiesResult.speed) { case 1: playPauseIcon = R.drawable.ic_pause_white_24dp; break; default: playPauseIcon = R.drawable.ic_play_arrow_white_24dp; break; } // Create the actions, depending on the type of media PendingIntent rewindPendingItent, ffPendingItent, playPausePendingIntent; playPausePendingIntent = buildActionPendingIntent(getActivePlayerResult.playerid, IntentActionsService.ACTION_PLAY_PAUSE); if (getItemResult.type.equals(ListType.ItemsAll.TYPE_SONG)) { rewindPendingItent = buildActionPendingIntent(getActivePlayerResult.playerid, IntentActionsService.ACTION_PREVIOUS); rewindIcon = R.drawable.ic_skip_previous_white_24dp; ffPendingItent = buildActionPendingIntent(getActivePlayerResult.playerid, IntentActionsService.ACTION_NEXT); ffIcon = R.drawable.ic_skip_next_white_24dp; } else { rewindPendingItent = buildActionPendingIntent(getActivePlayerResult.playerid, IntentActionsService.ACTION_REWIND); rewindIcon = R.drawable.ic_fast_rewind_white_24dp; ffPendingItent = buildActionPendingIntent(getActivePlayerResult.playerid, IntentActionsService.ACTION_FAST_FORWARD); ffIcon = R.drawable.ic_fast_forward_white_24dp; } // Setup the collpased and expanded notifications final RemoteViews collapsedRV = new RemoteViews(this.getPackageName(), R.layout.notification_colapsed); collapsedRV.setImageViewResource(R.id.rewind, rewindIcon); collapsedRV.setOnClickPendingIntent(R.id.rewind, rewindPendingItent); collapsedRV.setImageViewResource(R.id.play, playPauseIcon); collapsedRV.setOnClickPendingIntent(R.id.play, playPausePendingIntent); collapsedRV.setImageViewResource(R.id.fast_forward, ffIcon); collapsedRV.setOnClickPendingIntent(R.id.fast_forward, ffPendingItent); collapsedRV.setTextViewText(R.id.title, title); collapsedRV.setTextViewText(R.id.text2, underTitle); final RemoteViews expandedRV = new RemoteViews(this.getPackageName(), R.layout.notification_expanded); expandedRV.setImageViewResource(R.id.rewind, rewindIcon); expandedRV.setOnClickPendingIntent(R.id.rewind, rewindPendingItent); expandedRV.setImageViewResource(R.id.play, playPauseIcon); expandedRV.setOnClickPendingIntent(R.id.play, playPausePendingIntent); expandedRV.setImageViewResource(R.id.fast_forward, ffIcon); expandedRV.setOnClickPendingIntent(R.id.fast_forward, ffPendingItent); expandedRV.setTextViewText(R.id.title, title); expandedRV.setTextViewText(R.id.text2, underTitle); final int expandedIconResId; if (isVideo) { expandedIconResId = R.id.icon_slim; expandedRV.setViewVisibility(R.id.icon_slim, View.VISIBLE); expandedRV.setViewVisibility(R.id.icon_square, View.GONE); } else { expandedIconResId = R.id.icon_square; expandedRV.setViewVisibility(R.id.icon_slim, View.GONE); expandedRV.setViewVisibility(R.id.icon_square, View.VISIBLE); } // Build the notification NotificationCompat.Builder builder = new NotificationCompat.Builder(this); final Notification notification = builder.setSmallIcon(smallIcon).setShowWhen(false).setOngoing(true) .setVisibility(NotificationCompat.VISIBILITY_PUBLIC) .setCategory(NotificationCompat.CATEGORY_TRANSPORT).setContentIntent(mRemoteStartPendingIntent) .setContent(collapsedRV).build(); // This is a convoluted way of loading the image and showing the // notification, but it's what works with Picasso and is efficient. // Here's what's going on: // // 1. The image is loaded asynchronously into a Target, and only after // it is loaded is the notification shown. Using targets is a lot more // efficient than letting Picasso load it directly into the // notification imageview, which causes a lot of flickering // // 2. The target needs to be static, because Picasso only keeps a weak // reference to it, so we need to keed a strong reference and reset it // to null when we're done. We also need to check if it is not null in // case a previous request hasn't finished yet. // // 3. We can only show the notification after the bitmap is loaded into // the target, so it is done in the callback // // 4. We specifically resize the image to the same dimensions used in // the remote, so that Picasso reuses it in the remote and here from the cache Resources resources = this.getResources(); final int posterWidth = resources.getDimensionPixelOffset(R.dimen.now_playing_poster_width); final int posterHeight = isVideo ? resources.getDimensionPixelOffset(R.dimen.now_playing_poster_height) : posterWidth; if (picassoTarget == null) { picassoTarget = new Target() { @Override public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) { showNotification(bitmap); } @Override public void onBitmapFailed(Drawable errorDrawable) { CharacterDrawable avatarDrawable = UIUtils.getCharacterAvatar(NotificationService.this, title); showNotification(Utils.drawableToBitmap(avatarDrawable, posterWidth, posterHeight)); } @Override public void onPrepareLoad(Drawable placeHolderDrawable) { } private void showNotification(Bitmap bitmap) { collapsedRV.setImageViewBitmap(R.id.icon, bitmap); if (Utils.isJellybeanOrLater()) { notification.bigContentView = expandedRV; expandedRV.setImageViewBitmap(expandedIconResId, bitmap); } NotificationManager notificationManager = (NotificationManager) getSystemService( Context.NOTIFICATION_SERVICE); notificationManager.notify(NOTIFICATION_ID, notification); picassoTarget = null; } }; // Load the image HostManager hostManager = HostManager.getInstance(this); hostManager.getPicasso().load(hostManager.getHostInfo().getImageUrl(poster)) .resize(posterWidth, posterHeight).into(picassoTarget); } } private PendingIntent buildActionPendingIntent(int playerId, String action) { LogUtils.LOGD(TAG, "Build action: " + action); Intent intent = new Intent(this, IntentActionsService.class).setAction(action) .putExtra(IntentActionsService.EXTRA_PLAYER_ID, playerId); return PendingIntent.getService(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); } private void removeNotification() { NotificationManager notificationManager = (NotificationManager) getSystemService( Context.NOTIFICATION_SERVICE); notificationManager.cancel(NOTIFICATION_ID); } }