Notificación mediante RemoteViews no funciona

Estoy intentando emitir una notificación modificada para requisitos particulares (que tiene play-pause, botones siguientes y anteriores). Pero esto no parece funcionar:

Lo que quiero : Emitir una notificación personalizada con play-pause, botones siguientes y anteriores, de mi Actividad. Esta actividad tiene un MediaPlayer activo
Cuál es el problema : La notificación NO se emite en absoluto.
Lo que he hecho : Llamar el siguiente código de mi actividad onCreate () una vez que MediaPlayer esté completo:

Cualquier ayuda es muy apreciada. Gracias !!

private void sendNotification() { Log.v(LOGTAG, "Inside sendNotification"); // Creating RemoteView and inflating it with a custom XML layout file RemoteViews notificationViews = new RemoteViews(getPackageName(), R.layout.notification); Updating some fields in the layout file notificationViews.setTextViewText(R.id.songNameTextViewNotify, trackInfo.getTrack()); notificationViews.setImageViewUri(R.id.songImageViewNotify, Uri.parse(trackInfo.getAlbumImageURL())); // Notification builder NotificationCompat.Builder builder = new NotificationCompat.Builder(this). setContent(notificationViews); // Pending intent to call my class // The intent will be caught in the onNewIntent() method Intent intent = new Intent(this, MusicPlayer.class); PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); notificationViews.setOnClickPendingIntent(R.id.playPauseButtomNotify, pendingIntent); // Issuing new Notification NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); Log.v(LOGTAG, "Sending Notification"); notificationManager.notify(NOTIFICATION_ID, builder.build()); }

Notification.xml

 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal"> <ImageView android:id="@+id/songImageViewNotify" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/no_image"/> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical"> <TextView android:id="@+id/songNameTextViewNotify" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/app_name" android:gravity="center"/> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal"> <ImageButton android:id="@+id/previousButtomNotify" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@android:drawable/ic_media_previous" android:onClick="playPreviousTrackNotify"/> <View android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" /> <ImageButton android:id="@+id/playPauseButtomNotify" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@android:drawable/ic_media_pause" android:onClick="playOrPauseNotify"/> <View android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" /> <ImageButton android:id="@+id/nextButtomNotify" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@android:drawable/ic_media_next" android:onClick="playNextTrackNotify"/> </LinearLayout> </LinearLayout> </LinearLayout>

Contenido completo de MusicPlayer.java

  package com.example.deep.musico; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.Context; import android.content.Intent; import android.media.AudioManager; import android.media.MediaPlayer; import android.net.Uri; import android.net.wifi.WifiManager; import android.os.Handler; import android.os.PowerManager; import android.support.v4.app.NotificationCompat; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.RemoteViews; import android.widget.SeekBar; import android.widget.TextView; import com.squareup.picasso.Picasso; import java.io.IOException; import java.util.ArrayList; import java.util.concurrent.TimeUnit; public class MusicPlayer extends ActionBarActivity implements MediaPlayer.OnPreparedListener { private int playTrack; private ArrayList<TrackInfo> trackList ; public static final String PLAY_URL = "url"; private static final String LOGTAG = "MusicPlayer"; private static int elapsedTime ; private static int remainingTime; TextView artistName; TextView albumName; ImageView albumImage; TextView songName; SeekBar songProgress; TextView startTime; TextView endTime; ImageButton previousSong; ImageButton playPause; ImageButton nextSong; TrackInfo trackInfo; MediaPlayer mediaPlayer; WifiManager.WifiLock wifiLock; Handler seekBarHandler = new Handler(); private int NOTIFICATION_ID = 1; private Runnable seekBarUpdate = new Runnable() { @Override public void run() { if(mediaPlayer != null) { elapsedTime = (int) mediaPlayer.getCurrentPosition(); remainingTime = (int) mediaPlayer.getDuration() - elapsedTime; // Log.v(LOGTAG, "Elapsed time from runnable : " + mediaPlayer.getCurrentPosition()); // Log.v(LOGTAG, "Remaining time from runnable : " + remainingTime); String formatTimeStart = String.format("%d:%d", TimeUnit.MILLISECONDS.toMinutes(elapsedTime), TimeUnit.MILLISECONDS.toSeconds(elapsedTime) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(elapsedTime))); String formatTimeEnd = String.format("%d:%d", TimeUnit.MILLISECONDS.toMinutes(remainingTime), TimeUnit.MILLISECONDS.toSeconds(remainingTime) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(remainingTime))); Log.v(LOGTAG, "Formatted start time : " + formatTimeStart); Log.v(LOGTAG, "Formatted end time : " + formatTimeEnd); startTime.setText(formatTimeStart); endTime.setText(formatTimeEnd); songProgress.setProgress(elapsedTime); seekBarHandler.postDelayed(seekBarUpdate, 50); } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_music_player); playTrack = getIntent().getIntExtra(SongsActivityFragment.PLAY_TRACK, 0); trackList = getIntent().getParcelableArrayListExtra(SongsActivityFragment.ALL_TRACKS); init(); init(playTrack); sendNotification(); // Intent intent = new Intent(this, PlayMusicService.class); // intent.putExtra(PLAY_URL, trackList.get(playTrack).getPreviewURL()); // startService(intent); } @Override protected void onNewIntent(Intent intent) { super.onNewIntent(intent); Log.v(LOGTAG, "In new Pending Intent "); } private void sendNotification() { Log.v(LOGTAG, "Inside sendNotification"); RemoteViews notificationViews = new RemoteViews(getPackageName(), R.layout.notification); notificationViews.setTextViewText(R.id.songNameTextViewNotify, trackInfo.getTrack()); notificationViews.setImageViewUri(R.id.songImageViewNotify, Uri.parse(trackInfo.getAlbumImageURL())); NotificationCompat.Builder builder = new NotificationCompat.Builder(this). setContent(notificationViews); Intent intent = new Intent(this, MusicPlayer.class); PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); notificationViews.setOnClickPendingIntent(R.id.playPauseButtomNotify, pendingIntent); NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); Log.v(LOGTAG, "Sending Notification"); notificationManager.notify(NOTIFICATION_ID, builder.build()); } private void init() { artistName = (TextView) findViewById(R.id.artistNameTextView); albumName = (TextView) findViewById(R.id.albumNameTextView); albumImage = (ImageView) findViewById(R.id.albumImageView); songName = (TextView) findViewById(R.id.songNameTextView); songProgress = (SeekBar) findViewById(R.id.songProgressBar); startTime = (TextView) findViewById(R.id.startTimeTextView); endTime = (TextView) findViewById(R.id.endTimeTextView); previousSong = (ImageButton) findViewById(R.id.previousButtom); playPause = (ImageButton) findViewById(R.id.playPauseButtom); nextSong = (ImageButton) findViewById(R.id.nextButtom); mediaPlayer = new MediaPlayer(); mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); mediaPlayer.setWakeMode(this, PowerManager.PARTIAL_WAKE_LOCK); mediaPlayer.setOnPreparedListener(this); wifiLock = ((WifiManager) getSystemService(WIFI_SERVICE)). createWifiLock(WifiManager.WIFI_MODE_FULL, "MusicLock"); wifiLock.acquire(); } private void init(int trackNumber){ if(mediaPlayer != null && mediaPlayer.isPlaying()){ mediaPlayer.stop(); } trackInfo = trackList.get(trackNumber); artistName.setText(trackInfo.getArtist()); albumName.setText(trackInfo.getAlbum()); if(! (trackInfo.getAlbumImageURL().equals(""))) { Picasso.with(this).load(trackInfo.getAlbumImageURL()).into(albumImage); } elapsedTime = 0; startTime.setText(String.valueOf(elapsedTime)); remainingTime = (int) mediaPlayer.getDuration(); endTime.setText(String.valueOf(remainingTime)); songName.setText(trackInfo.getTrack()); songProgress.setProgress(elapsedTime); // Moving below line to Runnable because mediaPlayer.getDuration() does not return right value songProgress.setMax(30 * 1000); Log.v(LOGTAG, "Duration from track info : " + String.valueOf(trackInfo.getDuration())); Log.v(LOGTAG, "Duration from mediaPlayer : " +String.valueOf(mediaPlayer.getDuration())); Log.v(LOGTAG, trackInfo.getPreviewURL()); try { mediaPlayer.setDataSource(trackInfo.getPreviewURL()); } catch (IOException e) { e.printStackTrace(); } mediaPlayer.prepareAsync(); songProgress.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { if(fromUser){ mediaPlayer.seekTo(progress); } elapsedTime = (int) mediaPlayer.getCurrentPosition(); remainingTime = (int) mediaPlayer.getDuration() - elapsedTime; // Log.v(LOGTAG, "Elapsed time from runnable : " + mediaPlayer.getCurrentPosition()); // Log.v(LOGTAG, "Remaining time from runnable : " + remainingTime); String formatTimeStart = String.format("%d:%d", TimeUnit.MILLISECONDS.toMinutes(elapsedTime), TimeUnit.MILLISECONDS.toSeconds(elapsedTime) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(elapsedTime))); String formatTimeEnd = String.format("%d:%d", TimeUnit.MILLISECONDS.toMinutes(remainingTime), TimeUnit.MILLISECONDS.toSeconds(remainingTime) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(remainingTime))); Log.v(LOGTAG, "Formatted start time : " + formatTimeStart); Log.v(LOGTAG, "Formatted end time : " + formatTimeEnd); startTime.setText(formatTimeStart); endTime.setText(formatTimeEnd); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { } }); } public void playPreviousTrack(View view){ mediaPlayer.reset(); if(playTrack == 0) { playTrack = trackList.size() - 1; } else { playTrack = playTrack - 1; } init(playTrack); } public void playNextTrack(View view){ mediaPlayer.reset(); if(playTrack == trackList.size() - 1) { playTrack = 0; } else { playTrack = playTrack + 1; } init(playTrack); } public void playOrPause(View view){ if(mediaPlayer.isPlaying()) { playPause.setImageResource(android.R.drawable.ic_media_play); mediaPlayer.pause(); } else { playPause.setImageResource(android.R.drawable.ic_media_pause); mediaPlayer.start(); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_music_player, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } @Override public void onPrepared(MediaPlayer mp) { mediaPlayer.start(); seekBarHandler.postDelayed(seekBarUpdate, 50); } @Override protected void onDestroy() { super.onDestroy(); mediaPlayer.release(); mediaPlayer = null; wifiLock.release(); } }