我正在尝试发出自定义通知（具有播放暂停，下一个和上一个按钮）。但这似乎不起作用：
我想要的内容：从我的活动中发出带有播放暂停，下一个和上一个按钮的自定义通知。此活动有一个有效的MediaPlayer
有什么问题：根本不会发出通知。
我做了什么：MediaPlayer完成后，从我的Activity onCreate（）调用以下代码：
非常感谢任何帮助。谢谢!!
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>
MusicPlayer.java的完整内容
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();
}
}