/*
* Copyright (C) 2015 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.supportv4.media;
import android.app.Notification;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.os.RemoteException;
import android.support.v4.app.NotificationCompat;
import android.support.v4.app.NotificationManagerCompat;
import android.support.v4.media.MediaDescriptionCompat;
import android.support.v4.media.MediaMetadataCompat;
import android.support.v4.media.session.MediaControllerCompat;
import android.support.v4.media.session.MediaSessionCompat;
import android.support.v4.media.session.PlaybackStateCompat;
import android.util.Log;
import com.example.android.supportv4.R;
import com.example.android.supportv4.media.utils.ResourceHelper;
/**
* Keeps track of a notification and updates it automatically for a given
* MediaSession. Maintaining a visible notification (usually) guarantees that the music service
* won't be killed during playback.
*/
public class MediaNotificationManager extends BroadcastReceiver {
private static final String TAG = "MediaNotiManager";
private static final int NOTIFICATION_ID = 412;
private static final int REQUEST_CODE = 100;
public static final String ACTION_PAUSE = "com.example.android.supportv4.media.pause";
public static final String ACTION_PLAY = "com.example.android.supportv4.media.play";
public static final String ACTION_PREV = "com.example.android.supportv4.media.prev";
public static final String ACTION_NEXT = "com.example.android.supportv4.media.next";
private final MediaBrowserServiceSupport mService;
private MediaSessionCompat.Token mSessionToken;
private MediaControllerCompat mController;
private MediaControllerCompat.TransportControls mTransportControls;
private PlaybackStateCompat mPlaybackState;
private MediaMetadataCompat mMetadata;
private NotificationManagerCompat mNotificationManager;
private PendingIntent mPauseIntent;
private PendingIntent mPlayIntent;
private PendingIntent mPreviousIntent;
private PendingIntent mNextIntent;
private int mNotificationColor;
private boolean mStarted = false;
public MediaNotificationManager(MediaBrowserServiceSupport service) {
mService = service;
updateSessionToken();
mNotificationColor = ResourceHelper.getThemeColor(mService,
android.R.attr.colorPrimary, Color.DKGRAY);
mNotificationManager = NotificationManagerCompat.from(mService);
String pkg = mService.getPackageName();
mPauseIntent = PendingIntent.getBroadcast(mService, REQUEST_CODE,
new Intent(ACTION_PAUSE).setPackage(pkg), PendingIntent.FLAG_CANCEL_CURRENT);
mPlayIntent = PendingIntent.getBroadcast(mService, REQUEST_CODE,
new Intent(ACTION_PLAY).setPackage(pkg), PendingIntent.FLAG_CANCEL_CURRENT);
mPreviousIntent = PendingIntent.getBroadcast(mService, REQUEST_CODE,
new Intent(ACTION_PREV).setPackage(pkg), PendingIntent.FLAG_CANCEL_CURRENT);
mNextIntent = PendingIntent.getBroadcast(mService, REQUEST_CODE,
new Intent(ACTION_NEXT).setPackage(pkg), PendingIntent.FLAG_CANCEL_CURRENT);
// Cancel all notifications to handle the case where the Service was killed and
// restarted by the system.
mNotificationManager.cancelAll();
}
/**
* Posts the notification and starts tracking the session to keep it
* updated. The notification will automatically be removed if the session is
* destroyed before {@link #stopNotification} is called.
*/
public void startNotification() {
if (!mStarted) {
mMetadata = mController.getMetadata();
mPlaybackState = mController.getPlaybackState();
// The notification must be updated after setting started to true
Notification notification = createNotification();
if (notification != null) {
mController.registerCallback(mCb);
IntentFilter filter = new IntentFilter();
filter.addAction(ACTION_NEXT);
filter.addAction(ACTION_PAUSE);
filter.addAction(ACTION_PLAY);
filter.addAction(ACTION_PREV);
mService.registerReceiver(this, filter);
mService.startForeground(NOTIFICATION_ID, notification);
mStarted = true;
}
}
}
/**
* Removes the notification and stops tracking the session. If the session
* was destroyed this has no effect.
*/
public void stopNotification() {
if (mStarted) {
mStarted = false;
mController.unregisterCallback(mCb);
try {
mNotificationManager.cancel(NOTIFICATION_ID);
mService.unregisterReceiver(this);
} catch (IllegalArgumentException ex) {
// ignore if the receiver is not registered.
}
mService.stopForeground(true);
}
}
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
Log.d(TAG, "Received intent with action " + action);
switch (action) {
case ACTION_PAUSE:
mTransportControls.pause();
break;
case ACTION_PLAY:
mTransportControls.play();
break;
case ACTION_NEXT:
mTransportControls.skipToNext();
break;
case ACTION_PREV:
mTransportControls.skipToPrevious();
break;
default:
Log.w(TAG, "Unknown intent ignored. Action=" + action);
}
}
/**
* Update the state based on a change on the session token. Called either when
* we are running for the first time or when the media session owner has destroyed the session
* (see {@link android.media.session.MediaController.Callback#onSessionDestroyed()})
*/
private void updateSessionToken() {
MediaSessionCompat.Token freshToken = mService.getSessionToken();
if (mSessionToken == null || !mSessionToken.equals(freshToken)) {
if (mController != null) {
mController.unregisterCallback(mCb);
}
mSessionToken = freshToken;
try {
mController = new MediaControllerCompat(mService, mSessionToken);
} catch (RemoteException e) {
Log.e(TAG, "Failed to create MediaControllerCompat.", e);
}
mTransportControls = mController.getTransportControls();
if (mStarted) {
mController.registerCallback(mCb);
}
}
}
private PendingIntent createContentIntent() {
Intent openUI = new Intent(mService, MediaBrowserSupport.class);
openUI.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
return PendingIntent.getActivity(mService, REQUEST_CODE, openUI,
PendingIntent.FLAG_CANCEL_CURRENT);
}
private final MediaControllerCompat.Callback mCb = new MediaControllerCompat.Callback() {
@Override
public void onPlaybackStateChanged(PlaybackStateCompat state) {
mPlaybackState = state;
Log.d(TAG, "Received new playback state " + state);
if (state != null && (state.getState() == PlaybackStateCompat.STATE_STOPPED ||
state.getState() == PlaybackStateCompat.STATE_NONE)) {
stopNotification();
} else {
Notification notification = createNotification();
if (notification != null) {
mNotificationManager.notify(NOTIFICATION_ID, notification);
}
}
}
@Override
public void onMetadataChanged(MediaMetadataCompat metadata) {
mMetadata = metadata;
Log.d(TAG, "Received new metadata " + metadata);
Notification notification = createNotification();
if (notification != null) {
mNotificationManager.notify(NOTIFICATION_ID, notification);
}
}
@Override
public void onSessionDestroyed() {
super.onSessionDestroyed();
Log.d(TAG, "Session was destroyed, resetting to the new session token");
updateSessionToken();
}
};
private Notification createNotification() {
Log.d(TAG, "updateNotificationMetadata. mMetadata=" + mMetadata);
if (mMetadata == null || mPlaybackState == null) {
return null;
}
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(mService);
// If skip to previous action is enabled
if ((mPlaybackState.getActions() & PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS) != 0) {
notificationBuilder.addAction(R.drawable.ic_skip_previous_white_24dp,
mService.getString(R.string.label_previous), mPreviousIntent);
}
addPlayPauseAction(notificationBuilder);
// If skip to next action is enabled
if ((mPlaybackState.getActions() & PlaybackStateCompat.ACTION_SKIP_TO_NEXT) != 0) {
notificationBuilder.addAction(R.drawable.ic_skip_next_white_24dp,
mService.getString(R.string.label_next), mNextIntent);
}
MediaDescriptionCompat description = mMetadata.getDescription();
String fetchArtUrl = null;
Bitmap art = null;
if (description.getIconUri() != null) {
// This sample assumes the iconUri will be a valid URL formatted String, but
// it can actually be any valid Android Uri formatted String.
// async fetch the album art icon
String artUrl = description.getIconUri().toString();
art = AlbumArtCache.getInstance().getBigImage(artUrl);
if (art == null) {
fetchArtUrl = artUrl;
// use a placeholder art while the remote art is being downloaded
art = BitmapFactory.decodeResource(mService.getResources(),
R.drawable.ic_default_art);
}
}
notificationBuilder
.setColor(mNotificationColor)
.setSmallIcon(R.drawable.ic_notification)
.setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
.setUsesChronometer(true)
.setContentIntent(createContentIntent())
.setContentTitle(description.getTitle())
.setContentText(description.getSubtitle())
.setLargeIcon(art);
setNotificationPlaybackState(notificationBuilder);
if (fetchArtUrl != null) {
fetchBitmapFromURLAsync(fetchArtUrl, notificationBuilder);
}
return notificationBuilder.build();
}
private void addPlayPauseAction(NotificationCompat.Builder builder) {
Log.d(TAG, "updatePlayPauseAction");
String label;
int icon;
PendingIntent intent;
if (mPlaybackState.getState() == PlaybackStateCompat.STATE_PLAYING) {
label = mService.getString(R.string.label_pause);
icon = R.drawable.ic_pause_white_24dp;
intent = mPauseIntent;
} else {
label = mService.getString(R.string.label_play);
icon = R.drawable.ic_play_arrow_white_24dp;
intent = mPlayIntent;
}
builder.addAction(new NotificationCompat.Action(icon, label, intent));
}
private void setNotificationPlaybackState(NotificationCompat.Builder builder) {
Log.d(TAG, "updateNotificationPlaybackState. mPlaybackState=" + mPlaybackState);
if (mPlaybackState == null || !mStarted) {
Log.d(TAG, "updateNotificationPlaybackState. cancelling notification!");
mService.stopForeground(true);
return;
}
if (mPlaybackState.getState() == PlaybackStateCompat.STATE_PLAYING
&& mPlaybackState.getPosition() >= 0) {
Log.d(TAG, "updateNotificationPlaybackState. updating playback position to "
+ (System.currentTimeMillis() - mPlaybackState.getPosition()) / 1000
+ " seconds");
builder
.setWhen(System.currentTimeMillis() - mPlaybackState.getPosition())
.setShowWhen(true)
.setUsesChronometer(true);
} else {
Log.d(TAG, "updateNotificationPlaybackState. hiding playback position");
builder
.setWhen(0)
.setShowWhen(false)
.setUsesChronometer(false);
}
// Make sure that the notification can be dismissed by the user when we are not playing:
builder.setOngoing(mPlaybackState.getState() == PlaybackStateCompat.STATE_PLAYING);
}
private void fetchBitmapFromURLAsync(final String bitmapUrl,
final NotificationCompat.Builder builder) {
AlbumArtCache.getInstance().fetch(bitmapUrl, new AlbumArtCache.FetchListener() {
@Override
public void onFetched(String artUrl, Bitmap bitmap, Bitmap icon) {
if (mMetadata != null && mMetadata.getDescription() != null &&
artUrl.equals(mMetadata.getDescription().getIconUri().toString())) {
// If the media is still the same, update the notification:
Log.d(TAG, "fetchBitmapFromURLAsync: set bitmap to " + artUrl);
builder.setLargeIcon(bitmap);
mNotificationManager.notify(NOTIFICATION_ID, builder.build());
}
}
});
}
}