本人初学Android，最近做了一个实现安卓简单音乐播放功能的播放器，收获不少，于是便记录下来自己的思路与知识总结，重温自己的探索之路。
1 那么先上几张截图来看下程序实现效果吧
2 可以看出基本实现的功能有
暂停（播放），上（下）一首，停止播放
点击列表中歌曲进行播放，点击按钮以弹出歌曲列表
屏幕上显示歌曲名称，演唱者，专辑图片
显示播放进度条，拖拽进度条以控制播放
通知栏中显示相关信息，并可在通知栏上控制播放
3 总体开发思路
一共有两个Activity界面（分别是主界面和播放细节界面），一个用以在后台播放音乐的Service，一个可以和用户进行交互Notificatication。为了能够使得活动与活动，活动与服务，活动与通知之间通信，采取发送广播的做法，由于我在MainActivity,PlayActivity,MusicService中都获取了歌曲信息列表，所以在他们之间直接传递歌曲下标location和状态isPlaying即可
核心是由MainActivity通过startService方法控制Service来进行播放
MainActivity中点击事件发生后更新自己的UI，同时startService
PlayActivity中点击事件发生后更新自己UI，发送广播给MainActivity，让MainActivity更新UI，startService，从而实现PlayActivity间接控制播放
Notification点击事件发生后发生广播给MainActivity，让MainActivity更新UI，startService，从而实现Notification间接控制播放
4 重要功能实现
1 内容提供器 ContentProvider
内容提供器用法一般有两种: 使用现有的内容提供器和创建自己的内容提供器。
在使用系统自带的内容提供器，注意要在AndroidManifest中添加权限声明，如果是危险权限，还要进行运行时权限声明，这里由于本人手机低于Android6.0系统，顾没有进行运行时申请。
这里我们使用了安卓自带媒体库所提供的接口来访问数据。详情看2
2 安卓MediaStore
安卓为我们提供了自带的媒体库，我们可以直接从中访问到所需的数据。这个MediaStore包括了多媒体数据库的所有信息，包括音频，视频和图像,android把所有的多媒体数据库接口进行了封装，所有的数据库不用自己进行创建，直接调用利用ContentResolver去掉用那些封装好的接口就可以进行数据库的操作了，实例如下：
1 通过genContentResolver的查询方法获得存储有数据的Cursor对象
Cursor cursor=context.getContentResolver()
.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null)
//query方法第一个参数为 Uri：这个Uri代表要查询的数据库名称加上表的名称，这里我们获取所有的歌曲信息，后面四个参数为查询条件和数据排列条件，这里我们都使用null
2获得了数据结果Cursor对象后，我们读取数据到程序的思路是：通过移动光标的位置来遍历cursor的
每一行，然后根据所需提取每一行相应列的信息，并添加到程序的变量中
for(int i=0;i
mp3InfoList.add(mp3Info);
3 界面编程
1 SeekBar的实现注意声明android:thumb="@drawable/media_player_progress_button"//滑动的光标
2 按钮ImageButton背景声明我采用如下：app:srcCompat="@drawable/play"/>
这样在活动中便可通过button.setDateResource(R.drawable....)来实现背景的切换，如果界面编程中直接使用setBackground方法，到时候会造成按钮背景的重叠而 不是切 换的效果（亲测）
3 使用ListIView的时候注意要在活动中setAdapter()，并设置响应子项点击事件(通过开启服务来播放点击的那首音乐)
5 Activity
1 点击专辑图片时使用startActivity方法由MainActivity进入PlayActivity，并由intent传递相关信息
Intent intent=new Intent(MainActivity.this,PlayActivity.class);
intent.putExtra("state",isPlaying);
intent.putExtra("location",location);
startActivity(intent);
2 使用startService方法开启服务，通过intent传递相关信息（case 0:播放所传递的location下标那首歌
case 1 :暂停/播放 case 2：seekBar拖动播放 case 3： 停止播放）
//传递歌曲下标location并启动服务
Intent intent=new Intent(MainActivity.this,MusicService.class);
intent.putExtra("tag",0);
intent.putExtra("location",location);
startService(intent);
6 实现后台自动播放下一首音乐 ：只需为MediaPlayer对象设置setOnCompletionListener()方法即可，在方法中使歌曲下标+1，播放即可，自动播放下一首后记得发送广播给
活动和Notification以更新UI
//设置自动播放下一首
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
if(mediaPlayer!=null){
try {
if (++location < mp3InfoList.size()) {
mediaPlayer.reset();
mediaPlayer.setDataSource(MusicService.this, Uri.parse(mp3InfoList.get(location).getUrl()));
mediaPlayer.prepare();
mediaPlayer.start();
}
}catch (Exception e){
e.printStackTrace();
}
}
7 实现显示播放进度功能：在Service中创建一个继承于AsyncTask的类，在该类子线程中线程每0.5秒发送一次带有当前播放进度的broadcast给活动界面以更新UI
public Integer doInBackground(Void...parms){
//设置while (true)以达到循环不断的目的
while (true){
try{
Thread.sleep(500);//线程沉睡500毫秒
}
catch (Exception e){
e.printStackTrace();
}
position=mediaPlayer.getCurrentPosition();//获得mediaPlayer当前播放进度
if(position
Intent mIntent=new Intent("com.example.musicplayer.update_seekbar");
mIntent.putExtra("position",position);
sendBroadcast(mIntent);//发送广播
}else{
break;
}
}
return 0;
}
8
为SeekBar设置点击拖动事件，通知seetOnSeekBarChangeListener(...)方法，其中OnSeekBarChangeListener类对象需重写三个方法，在 public voidonStop TrackingTouch(SeekBar seekBar)方法中发送广播给Service（带有Progress信息）
在Service中接收progress信息调用MediaPlayer.seekTo(progress)方法来响应拖动事件
//为SeekBar设置点击拖动事件
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
int progress=seekBar.getProgress();
Intent intent=new Intent(MainActivity.this, MusicService.class);
intent.putExtra("tag",2);
intent.putExtra("progress",progress);
startService(intent);
}
});
9
使用带有布局的通知 : 与使用普通通知无异，但给通知使用setContent(RemoteViews remoteViews)方法来设定布局，remoteViews的点击事件的响应为向MainActivity发送广播
remoteViews = new RemoteViews(getPackageName(), R.layout.remoteviews_item_dl);//设置RemoteViews的布局 remoteViews.setTextViewText(R.id.tv_filename, getPackageName()); // 设置标题 remoteViews.setTextViewText(R.id.tv_content, "this is notification"); // 设置内容
remoteViews.setImageViewBitmap(R.id.notification_imageView,bitmap);//设置控件Bitmap
remoteViews.setOnClickPendingIntent(R.id.notification_next,PendingIntent.getBroadcast(this,0,
new Intent("com.example.musicplayer.notification.next").putExtra("tag2",2), PendingIntent.FLAG_UPDATE_CURRENT));// 设置点击事件响应结果为发送广播
Notification notification=new NotificationCompat.builder(this).setContent(remotoViews).build();//构建出带有特定布局的通知
manager.notify(0,notification);//显示通知
10
实现点击按钮弹出AlertIDialog，在dialog中显示歌曲列表listView并设置点击事件，关键在于为ListView控件设置适配器：这里使用SimpleAdapter创建（要求绑定的数据是List>数据类型（String为key，第二个参数为对应数据））获得dialog框架布局LinearoutLayout和歌曲列表布局ListView，并将ListIView添加到框架布局上
建立一个数组存储listview上显示的数据
获取到集合数据
创建SimpleAdapter实例，参数解读（context,数据数组，listVIew item的布局，key数组，布局id数组），将key储存的数据赋予布局中相应id控件
为listView设置Adapter
dialog.setView(dialog 框架布局)，dialog.show()
listView设置点击事件（发送带有点击item下标信息的广播给MainActivity）
//通过AlertDialog显示歌曲列表
public void showMusicList(){
Log.d("PlayActivity","showMusicList start");
LinearLayout linearLayoutMain = new LinearLayout(this);//自定义一个布局文件
linearLayoutMain.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
Log.d("PlayActivity","LinearLayout created");
ListView listView = new ListView(this);//this为获取当前的上下文
listView.setFadingEdgeLength(0);
List>musicList=new ArrayList>();
for(int i=0;i
Mapitem=new HashMap();
item.put("musicName",mp3InfoList.get(i).getTitle().toString());
item.put("artist",mp3InfoList.get(i).getArtist().toString());
musicList.add(item);
}
Log.d("PlayActivity","LinearLayout created and itialized");
//
SimpleAdapter adapter=new SimpleAdapter(PlayActivity.this,musicList,R.layout.music_item
,new String[]{"musicName","artist"}
, new int[]{R.id.music_item_musicName,R.id.music_item_artist});
Log.d("PlayActivity","SimpleAdapter created");
listView.setAdapter(adapter);
linearLayoutMain.addView(listView);
Log.d("PlayActivity","listView was added to the linearLayout");
final AlertDialog dialog=new AlertDialog.Builder(this).setTitle("歌曲列表").setView(linearLayoutMain)
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.cancel();
}
}).create();
Log.d("PlayActivity","Dialog created");
dialog.show();
Log.d("PlayActivity","Dialog showed");
//响应子项点击事件
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
// 注意这里的参数第三个参数Item在适配器中的位置public void onItemClick(AdapterView adapterView, View view, int i, long l) { //更新自身UI musicNameView.setText(mp3InfoList.get(i).getTitle()); artistView.setText(mp3InfoList.get(i).getArtist()); durationView.setText(MediaUtil.formatTime(mp3InfoList.get(i).getDuration())); //发送广播附带歌曲下标给MainActivity来控制服务播放歌曲 Intent intent=new Intent("com.example.musicplayer.react_to_playactiity"); intent.putExtra("tag1",4); intent.putExtra("location",i); sendBroadcast(intent); Log.d("PlayActivity","broadcast sended"); dialog.cancel(); Log.d("PlayActivity","Dialog canceled"); } }); }
5 开发思路的实现细节
1 首先新建保存mp3音乐相关属性信息的实体类Mp3Info（保存url，title，artist等等）
ublic class Mp3Info {
private String url;//路径
private String title;//歌曲名
private String artist;//艺术家
private long duration;//歌曲时长
private long id;
private long albumId;//以上两种Id用以获取专辑图片
public Mp3Info(){
}
public Mp3Info(String url,String title,String artist,long duration,long id,long albumId){
this.url=url;
this.title=title;
this.artist=artist;
this.duration=duration;
this.id=id;
this.albumId=albumId;
}
public void setUrl(String url){
this.url=url;
}
public void setTitle(String title){
this.title=title;
}
public void setArtist(String artist){
this.artist=artist;
}
public void setDuration(long duration){
this.duration=duration;
}
public void setId(long id){this.id=id;}
public void setAlbumId(long albumId){this.albumId=albumId;}
public String getUrl(){
return url;
}
public String getTitle(){
return title;
}
public String getArtist(){
return artist;
}
public long getDuration(){
return duration;}
public long getId() {
return id;
}
public long getAlbumId() {
return albumId;
}
}
2 新建MediaUtil类用于从安卓媒体库中获取歌曲信息并保存在程序的List中，提供静态方法给其他代码来直接复用
public class MediaUtil {
//获取专辑封面的Uri
private static final Uri albumArtUri = Uri.parse("content://media/external/audio/albumart");
//从安卓媒体库中获取歌曲信息并保存在程序的List中,并提供静态方法给其他类来直接获得生成的歌曲列表信息
public static ListgetMp3InfoList(Context context){
Cursor cursor=context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,
null);
Listmp3InfoList=new ArrayList<>();
for(int i=0;i
cursor.moveToNext();
Mp3Info mp3Info=new Mp3Info();
mp3Info.setUrl(cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.DATA)));
mp3Info.setTitle(cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.TITLE)));
mp3Info.setArtist(cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Media.ARTIST)));
mp3Info.setDuration(cursor.getLong(cursor
.getColumnIndex(MediaStore.Audio.Media.DURATION)));
mp3Info.setId(cursor.getLong(cursor
.getColumnIndex(MediaStore.Audio.Media._ID)));
mp3Info.setAlbumId(cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID)));
mp3InfoList.add(mp3Info);
}
return mp3InfoList;
}
/**
* 格式化时间，将毫秒转换为分:秒格式//将long类型转化为String型，
* @param time
* @return
*/
public static String formatTime(long time) {
String min = time / (1000 * 60) + "";
String sec = time % (1000 * 60) + "";
if (min.length() < 2) {
min = "0" + time / (1000 * 60) + "";
} else {
min = time / (1000 * 60) + "";
}
if (sec.length() == 4) {
sec = "0" + (time % (1000 * 60)) + "";
} else if (sec.length() == 3) {
sec = "00" + (time % (1000 * 60)) + "";
} else if (sec.length() == 2) {
sec = "000" + (time % (1000 * 60)) + "";
} else if (sec.length() == 1) {
sec = "0000" + (time % (1000 * 60)) + "";
}
return min + ":" + sec.trim().substring(0, 2);
}
/**
* 获取默认专辑图片
* @param context
* @return
*/
public static Bitmap getDefaultArtwork(Context context,boolean small) {
BitmapFactory.Options opts = new BitmapFactory.Options();
opts.inPreferredConfig = Bitmap.Config.RGB_565;
if(small){ //返回小图片
return BitmapFactory.decodeStream(context.getResources().openRawResource(R.drawable.music5), null, opts);
}
return BitmapFactory.decodeStream(context.getResources().openRawResource(R.drawable.defaultalbum), null, opts);
}
/**
* 从文件当中获取专辑封面位图
* @param context
* @param songid
* @param albumid
* @return
*/
private static Bitmap getArtworkFromFile(Context context, long songid, long albumid){
Bitmap bm = null;
if(albumid < 0 && songid < 0) {
throw new IllegalArgumentException("Must specify an album or a song id");
}
try {
BitmapFactory.Options options = new BitmapFactory.Options();
FileDescriptor fd = null;
if(albumid < 0){
Uri uri = Uri.parse("content://media/external/audio/media/"
+ songid + "/albumart");
ParcelFileDescriptor pfd = context.getContentResolver().openFileDescriptor(uri, "r");
if(pfd != null) {
fd = pfd.getFileDescriptor();
}
} else {
Uri uri = ContentUris.withAppendedId(albumArtUri, albumid);
ParcelFileDescriptor pfd = context.getContentResolver().openFileDescriptor(uri, "r");
if(pfd != null) {
fd = pfd.getFileDescriptor();
}
}
options.inSampleSize = 1;
// 只进行大小判断
options.inJustDecodeBounds = true;
// 调用此方法得到options得到图片大小
BitmapFactory.decodeFileDescriptor(fd, null, options);
// 我们的目标是在800pixel的画面上显示
// 所以需要调用computeSampleSize得到图片缩放的比例
options.inSampleSize = 100;
// 我们得到了缩放的比例，现在开始正式读入Bitmap数据
options.inJustDecodeBounds = false;
options.inDither = false;
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
//根据options参数，减少所需要的内存
bm = BitmapFactory.decodeFileDescriptor(fd, null, options);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return bm;
}
/**
* 获取专辑封面位图对象
* @param context
* @param song_id
* @param album_id
* @param allowdefalut
* @return
*/
public static Bitmap getArtwork(Context context, long song_id, long album_id, boolean allowdefalut, boolean small){
if(album_id < 0) {
if(song_id < 0) {
Bitmap bm = getArtworkFromFile(context, song_id, -1);
if(bm != null) {
return bm;
}
}
if(allowdefalut) {
return getDefaultArtwork(context, small);
}
return null;
}
ContentResolver res = context.getContentResolver();
Uri uri = ContentUris.withAppendedId(albumArtUri, album_id);
if(uri != null) {
InputStream in = null;
try {
in = res.openInputStream(uri);
BitmapFactory.Options options = new BitmapFactory.Options();
//先制定原始大小
options.inSampleSize = 1;
//只进行大小判断
options.inJustDecodeBounds = true;
//调用此方法得到options得到图片的大小
BitmapFactory.decodeStream(in, null, options);
/** 我们的目标是在你N pixel的画面上显示。 所以需要调用computeSampleSize得到图片缩放的比例 **/
/** 这里的target为800是根据默认专辑图片大小决定的，800只是测试数字但是试验后发现完美的结合 **/
if(small){
options.inSampleSize = computeSampleSize(options, 40);
} else{
options.inSampleSize = computeSampleSize(options, 600);
}
// 我们得到了缩放比例，现在开始正式读入Bitmap数据
options.inJustDecodeBounds = false;
options.inDither = false;
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
in = res.openInputStream(uri);
return BitmapFactory.decodeStream(in, null, options);
} catch (FileNotFoundException e) {
Bitmap bm = getArtworkFromFile(context, song_id, album_id);
if(bm != null) {
if(bm.getConfig() == null) {
bm = bm.copy(Bitmap.Config.RGB_565, false);
if(bm == null && allowdefalut) {
return getDefaultArtwork(context, small);
}
}
} else if(allowdefalut) {
bm = getDefaultArtwork(context, small);
}
return bm;
} finally {
try {
if(in != null) {
in.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
return null;
}
/**
* 对图片进行合适的缩放
* @param options
* @param target
* @return
*/
public static int computeSampleSize(BitmapFactory.Options options, int target) {
int w = options.outWidth;
int h = options.outHeight;
int candidateW = w / target;
int candidateH = h / target;
int candidate = Math.max(candidateW, candidateH);
if(candidate == 0) {
return 1;
}
if(candidate > 1) {
if((w > target) && (w / candidate) < target) {
candidate -= 1;
}
}
if(candidate > 1) {
if((h > target) && (h / candidate) < target) {
candidate -= 1;
}
}
return candidate;
}
}
3 活动界面编程，这里直接上代码
主界面：
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/mainActivity_drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
android:id="@+id/mainActivity_toolBar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:popupTheme="@style/ThemeOverlay.AppCompat.Light"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/mainActivity_toolBar"
android:background="#FFF">
android:id="@+id/musicName_list"
android:layout_width="match_parent"
android:layout_height="440dp"
android:textColor="#FFF"/>
android:id="@+id/mainActivity_seekBarLayout"
android:layout_width="match_parent"
android:layout_height="35dp"
android:layout_below="@+id/musicName_list"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:background="@drawable/drawable_bg">
android:id="@+id/mainActivity_seekBar"
android:layout_width="match_parent"
android:layout_height="20dp"
android:thumb="@drawable/media_player_progress_button"
/>
android:id="@+id/main_current_position"
android:layout_width="wrap_content"
android:layout_height="25dp"
android:layout_below="@id/mainActivity_seekBar"
android:text="0:00"
android:textColor="#060606"/>
android:id="@+id/main_final_position"
android:layout_width="wrap_content"
android:layout_height="25dp"
android:layout_alignParentRight="true"
android:layout_below="@id/mainActivity_seekBar"
android:text="3:00"
android:textColor="#090808"/>
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:background="#7e7677"
android:layout_below="@+id/mainActivity_seekBarLayout">
android:id="@+id/album_view"
android:layout_width="80dp"
android:layout_height="match_parent"
/>
android:id="@+id/mainActivity_musicName"
android:layout_width="80dp"
android:layout_toRightOf="@+id/album_view"
android:layout_marginLeft="5dp"
android:layout_height="wrap_content"
android:text="歌曲名称"
android:textColor="#090909"/>
android:id="@+id/mainActivity_artist"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_below="@+id/mainActivity_musicName"
android:layout_marginLeft="5dp"
android:layout_toRightOf="@+id/album_view"
android:text="歌曲作者"
android:textColor="#060606"/>
android:id="@+id/mainActivity_play_pause"
android:layout_width="50dp"
android:layout_height="60dp"
android:layout_centerInParent="true"
android:layout_toLeftOf="@+id/mainActivity_next"
app:srcCompat="@drawable/play"/>
android:id="@+id/mainActivity_next"
android:layout_width="50dp"
android:layout_height="60dp"
android:layout_centerInParent="true"
app:srcCompat="@drawable/next"
android:layout_toLeftOf="@+id/mainActivity_menu"/>
android:id="@+id/mainActivity_menu"
android:layout_width="50dp"
android:layout_height="60dp"
android:layout_centerInParent="true"
android:layout_alignParentRight="true"
app:srcCompat="@drawable/menu"
/>
android:id="@+id/mainActivity_nav_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="start"
app:menu="@menu/nav_menu"
app:headerLayout="@layout/nav_header"
>
播放细节界面
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#885959"
>
android:id="@+id/play_activity_toolBar1"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
>
android:layout_width="match_parent"
android:layout_height="match_parent">
android:id="@+id/playActivity_return"
android:layout_width="45dp"
android:layout_height="30dp"
android:background="@drawable/back_return_normal"/>
android:id="@+id/playActivity_musicName"
android:layout_width="match_parent"
android:layout_height="20dp"
android:layout_toRightOf="@+id/playActivity_return"
android:text="歌曲名称"
android:layout_marginLeft="5dp"
android:textColor="#fcfcfc"/>
android:id="@+id/playActivity_artist"
android:layout_width="match_parent"
android:layout_marginLeft="5dp"
android:layout_height="20dp"
android:layout_toRightOf="@+id/playActivity_return"
android:layout_below="@+id/playActivity_musicName"
android:text="演唱者"
android:textColor="#c3b9b9"
/>
android:id="@+id/playActivity_musicLyrics"
android:layout_width="match_parent"
android:layout_height="400dp"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_above="@+id/playActivity_seekbarLayout">
android:id="@+id/playActivity_seekbarLayout"
android:layout_width="match_parent"
android:layout_height="35dp"
android:background="@drawable/drawable_bg"
android:layout_above="@+id/playActivity_toolBar2">
android:id="@+id/playActivity_seekBar"
android:layout_width="match_parent"
android:layout_height="20dp"
android:thumb="@drawable/media_player_progress_button"
/>
android:id="@+id/current_position"
android:layout_width="wrap_content"
android:layout_height="25dp"
android:layout_below="@id/playActivity_seekBar"
android:text="0:00"
android:textColor="#FFF"/>
android:id="@+id/final_position"
android:layout_width="wrap_content"
android:layout_height="25dp"
android:layout_alignParentRight="true"
android:layout_below="@id/playActivity_seekBar"
android:text="3:00"
android:textColor="#FFF"/>
android:id="@+id/playActivity_toolBar2"
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
android:id="@+id/stop"
android:layout_width="50dp"
android:layout_margin="10dp"
android:layout_height="match_parent"
app:srcCompat="@drawable/stop"/>
android:id="@+id/previous"
android:layout_width="50dp"
android:layout_margin="10dp"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/stop"
app:srcCompat="@drawable/previous"/>
android:id="@+id/play_pause"
android:layout_margin="10dp"
android:layout_width="50dp"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/previous"
app:srcCompat="@drawable/play"
/>
android:id="@+id/next_music"
android:layout_width="50dp"
android:layout_margin="10dp"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/play_pause"
app:srcCompat="@drawable/next"
/>
android:id="@+id/music_menu"
android:layout_width="50dp"
android:layout_margin="10dp"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/next_music"
app:srcCompat="@drawable/playqueue"
/>
4 MainActivity编程
public class MainActivity extends AppCompatActivity {
static ListView listView;
Listmp3InfoList;
Mp3Info mp3Info;
static int location=0;
static Boolean isPlaying=false;
List musicNameList=new ArrayList<>();
static TextView musicNameView;
static TextView artistView;
static ImageView albumView;
static ImageButton playOrPauseButton;
static ImageButton nextButton;
static SeekBar seekBar;
static TextView currentTiemView;
static TextView durationView;
DrawerLayout drawerLayout;
String Tag="MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//ToolBar及DrawerLayout
Toolbar toolbar=(Toolbar)findViewById(R.id.mainActivity_toolBar);
setSupportActionBar(toolbar);
ActionBar actionBar=getSupportActionBar();
if(actionBar!=null){
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeAsUpIndicator(R.drawable.menu);
}
drawerLayout=(DrawerLayout)findViewById(R.id.mainActivity_drawer_layout);
//获得各个控件并设置点击事件
musicNameView=(TextView)findViewById(R.id.mainActivity_musicName);
artistView=(TextView)findViewById(R.id.mainActivity_artist);
playOrPauseButton=(ImageButton)findViewById(R.id.mainActivity_play_pause);
nextButton=(ImageButton)findViewById(R.id.mainActivity_next);
seekBar=(SeekBar)findViewById(R.id.mainActivity_seekBar);
currentTiemView=(TextView)findViewById(R.id.main_current_position) ;
durationView=(TextView)findViewById(R.id.main_final_position);
albumView=(ImageView)findViewById(R.id.album_view);
//设置各控件初始视图为上次离开时所播放的歌曲，如果进程已被Kill掉，则为第一首
mp3InfoList=MediaUtil.getMp3InfoList(MainActivity.this);
mp3Info=mp3InfoList.get(location);
musicNameView.setText(mp3Info.getTitle());
artistView.setText(mp3Info.getArtist());
long id=mp3Info.getId();
long albumId=mp3Info.getAlbumId();
albumView.setImageBitmap(MediaUtil.getArtwork(this, id,
albumId, true, false));
if(isPlaying)
playOrPauseButton.setImageResource(R.drawable.pause);
else playOrPauseButton.setImageResource(R.drawable.play);
//专辑图片点击事件，进入PlayActivity中，并通过Intent传递location和isPlaying状态
albumView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent=new Intent(MainActivity.this,PlayActivity.class);
intent.putExtra("state",isPlaying);
intent.putExtra("location",location);
startActivity(intent);
}
});
//暂停、播放按钮点击事件
playOrPauseButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
playOrpause();
}
});
//下一首点击事件
nextButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
nextMusic();
}
});
//从媒体库中获得音乐列表并显示到ListView中,同时设置点击事件
listView=(ListView)findViewById(R.id.musicName_list) ;
for(int i=0;i
musicNameList.add(mp3InfoList.get(i).getTitle());
ArrayAdapter aa=new ArrayAdapter(this,android.R.layout.simple_list_item_1,musicNameList);
listView.setAdapter(aa);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView adapterView, View view, int i, long l) {
location=i;
setPlay(location);
}
});
//注册监听SeekBar变化的监听器
IntentFilter filter=new IntentFilter();
filter.addAction("com.example.musicplayer.update_seekbar");
UpdateSeekbarBroadcast receiver=new UpdateSeekbarBroadcast();
registerReceiver(receiver,filter);
//监听PlayActivity的点击事件
IntentFilter filter1=new IntentFilter();
filter1.addAction("com.example.musicplayer.react_to_playactiity");
PlayActivityBroadcast receiver1=new PlayActivityBroadcast();
registerReceiver(receiver1,filter1);
//注册监听Notification的监听器
IntentFilter filter2=new IntentFilter();
filter2.addAction("com.example.musicplayer.notification.previous");
filter2.addAction("com.example.musicplayer.notification.play_pause");
filter2.addAction("com.example.musicplayer.notification.next");
NotificationBroadcast receiver2=new NotificationBroadcast();
registerReceiver(receiver2,filter2);
//注册监听后台顺序播放的监听器
IntentFilter filter3=new IntentFilter();
filter3.addAction("com.example.musicplayer.order_play");
OrderPlayBroadcast receiver3=new OrderPlayBroadcast();
registerReceiver(receiver3,filter3);
//为SeekBar设置点击拖动事件
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
int progress=seekBar.getProgress();
Intent intent=new Intent(MainActivity.this, MusicService.class);
intent.putExtra("tag",2);
intent.putExtra("progress",progress);
startService(intent);
}
});
}
public boolean onCreateOptionsMenu(Menu menu){
getMenuInflater().inflate(R.menu.toolbar,menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem menuItem){
switch (menuItem.getItemId()){
case android.R.id.home:drawerLayout.openDrawer(GravityCompat.START);
break;
case R.id.search:
Toast.makeText(MainActivity.this,"You clicked the search button",Toast.LENGTH_SHORT).show();
break;
}
return true;
}
//设置播放某一首歌曲
public void setPlay(int location){
//切换播放状态
isPlaying=true;
//根据要播放的音乐曲目更新MainActivity的UI
mp3Info=mp3InfoList.get(location);
long id=mp3Info.getId();
long albumId=mp3Info.getAlbumId();
musicNameView.setText(mp3Info.getTitle());
artistView.setText(mp3Info.getArtist());
Bitmap bitmap = MediaUtil.getArtwork(this, id,
albumId, true, false);// 获取专辑位图对象，为大图
albumView.setImageBitmap(bitmap);
//切换播放状态图标
playOrPauseButton.setImageResource(R.drawable.pause);
seekBar.setMax((int)mp3Info.getDuration());
currentTiemView.setText("0:00");
durationView.setText(MediaUtil.formatTime(mp3Info.getDuration()));
//传递歌曲下标location并启动服务
Intent intent=new Intent(MainActivity.this,MusicService.class);
intent.putExtra("tag",0);
intent.putExtra("location",location);
startService(intent);
}
//播放下一首歌曲
public void nextMusic(){
if((++location)
setPlay(location);
}
}
//播放上一首歌曲
public void previousMusic(){
if ((--location)>=0){
setPlay(location);
}
}
//暂停或继续播放
public void playOrpause(){
Intent intent=new Intent(MainActivity.this,MusicService.class);
//切换播放状态并改变状态图标
isPlaying=!isPlaying;
if(isPlaying)
playOrPauseButton.setImageResource(R.drawable.pause);
else playOrPauseButton.setImageResource(R.drawable.play);
intent.putExtra("tag",1);
intent.putExtra("state",isPlaying);
startService(intent);
}
//停止播放此首音乐，并将进度条滑至开始处
public void stopMusic(){
Intent intent=new Intent(MainActivity.this,MusicService.class);
intent.putExtra("tag",3);
if(isPlaying)
playOrPauseButton.setImageResource(R.drawable.play);
else playOrPauseButton.setImageResource(R.drawable.pause);
startService(intent);
}
//监听来自Service的SeekBar变化
class UpdateSeekbarBroadcast extends BroadcastReceiver{
@Override
public void onReceive(Context context,Intent intent){
int position=intent.getIntExtra("position",0);
currentTiemView.setText(MediaUtil.formatTime(position));
seekBar.setProgress(position);
}
}
//接收来自PlayActivity的广播
class PlayActivityBroadcast extends BroadcastReceiver{
@Override
public void onReceive(Context context,Intent intent){
int tag1=intent.getIntExtra("tag1",-1);
switch (tag1){
case 0: {
playOrpause();
}
break;
case 1:previousMusic();
break;
case 2:nextMusic();
break;
case 3:stopMusic();
default:
break;
case 4:{
location=intent.getIntExtra("location",5);
setPlay(location);
}
}
}
}
//接收来自Notification的广播
class NotificationBroadcast extends BroadcastReceiver{
@Override
public void onReceive(Context context,Intent intent){
int tag2=intent.getIntExtra("tag2",-1);
LogUtil.d(Tag,"received the broadcast from notification");
switch (tag2){
case 0:previousMusic();
break;
case 1:{
playOrpause();
isPlaying=intent.getBooleanExtra("state",false);
}
break;
case 2:nextMusic();
break;
default:
break;
}
}
}
//接收来自后台自动播放的广播以更新UI
class OrderPlayBroadcast extends BroadcastReceiver{
@Override
public void onReceive(Context context,Intent intent){
LogUtil.d(Tag,"update ui according to the orderly play");
location=intent.getIntExtra("location",-1);
mp3Info=mp3InfoList.get(location);
long id=mp3Info.getId();
long albumId=mp3Info.getAlbumId();
musicNameView.setText(mp3Info.getTitle());
artistView.setText(mp3Info.getArtist());
Bitmap bitmap = MediaUtil.getArtwork(MainActivity.this, id,
albumId, true, false);// 获取专辑位图对象，为大图
albumView.setImageBitmap(bitmap);
seekBar.setMax((int)mp3Info.getDuration());
currentTiemView.setText("0:00");
durationView.setText(MediaUtil.formatTime(mp3Info.getDuration()));
}
}
}
PlayActivity
public class PlayActivity extends AppCompatActivity implements View.OnClickListener {
TextView musicNameView,artistView;
Button returnBack;
ImageButton stop,previousMusic,playOrPauseButton,nextMusic,musicList;
SeekBar seekBar;
TextView currentTimeView,durationView;
Intent intent;
static int location=0;
static Boolean isPlaying=false;
Mp3Info mp3Info;
Listmp3InfoList=new ArrayList<>();
String[]musicNameList;
String Tag="PlayActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_play);
//获得歌曲列表信息
mp3InfoList=MediaUtil.getMp3InfoList(PlayActivity.this);
//获得各控件实例
musicNameView=(TextView)findViewById(R.id.playActivity_musicName) ;
artistView=(TextView)findViewById(R.id.playActivity_artist);
stop=(ImageButton)findViewById(R.id.stop);
previousMusic=(ImageButton)findViewById(R.id.previous);
playOrPauseButton=(ImageButton)findViewById(R.id.play_pause);
nextMusic=(ImageButton)findViewById(R.id.next_music);
musicList=(ImageButton)findViewById(R.id.music_menu);
returnBack=(Button)findViewById(R.id.playActivity_return);
seekBar=(SeekBar)findViewById(R.id.playActivity_seekBar);
currentTimeView=(TextView)findViewById(R.id.current_position);
durationView=(TextView)findViewById(R.id.final_position);
//从MainActivity中传递过来的数据
Intent intent1=getIntent();
location=intent1.getIntExtra("location",0);
isPlaying=intent1.getBooleanExtra("state",false);
//根据传递过来的数据更新UI视图
seekBar.setMax((int)(mp3InfoList.get(location).getDuration()));
currentTimeView.setText("0:00");
durationView.setText(MediaUtil.formatTime(mp3InfoList.get(location).getDuration()));
musicNameView.setText(mp3InfoList.get(location).getTitle());
artistView.setText(mp3InfoList.get(location).getArtist());
durationView.setText(MediaUtil.formatTime(mp3InfoList.get(location).getDuration()));
if(isPlaying)
playOrPauseButton.setImageResource(R.drawable.pause);
else playOrPauseButton.setImageResource(R.drawable.play);
//注册seekBar监听器
IntentFilter filter=new IntentFilter();
filter.addAction("com.example.musicplayer.update_seekbar");
UpdateSeekbarBroadcast receiver=new UpdateSeekbarBroadcast();
registerReceiver(receiver,filter);
//注册后台顺序播放的监听器
IntentFilter filter1=new IntentFilter();
filter1.addAction("com.example.musicplayer.order_play");
OrderPlayBroadcast receiver1=new OrderPlayBroadcast();
registerReceiver(receiver1,filter1);
//为SeekBar设置点击拖动事件
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
int progress=seekBar.getProgress();
Intent intent=new Intent(PlayActivity.this, MusicService.class);
intent.putExtra("tag",2);
intent.putExtra("progress",progress);
startService(intent);
}
});
//设置各按钮点击事件
stop.setOnClickListener(this);
previousMusic.setOnClickListener(this);
playOrPauseButton.setOnClickListener(this);
nextMusic.setOnClickListener(this);
musicList.setOnClickListener(this);
}
//监听来自Service的SeekBar变化
class UpdateSeekbarBroadcast extends BroadcastReceiver{
@Override
public void onReceive(Context context,Intent intent){
int position=intent.getIntExtra("position",0);
currentTimeView.setText(MediaUtil.formatTime(position));
seekBar.setProgress(position);
}
}
//接收来自后台自动播放的广播以更新UI
class OrderPlayBroadcast extends BroadcastReceiver{
@Override
public void onReceive(Context context,Intent intent){
LogUtil.d(Tag,"PlayActivity receive broadcast from service orderly play to update UI ");
location=intent.getIntExtra("location",-1);
mp3Info=mp3InfoList.get(location);
musicNameView.setText(mp3Info.getTitle());
artistView.setText(mp3Info.getArtist());
seekBar.setMax((int)mp3Info.getDuration());
currentTimeView.setText("0:00");
durationView.setText(MediaUtil.formatTime(mp3Info.getDuration()));
}
}
@Override
public void onClick(View view){
Intent intent=new Intent("com.example.musicplayer.react_to_playactiity");
switch (view.getId()){
case R.id.stop :{
intent.putExtra("tag1",3);
}
break;
case R.id.previous: {
isPlaying=!isPlaying;
previousMusic();
intent.putExtra("tag1", 1);
}
break;
case R.id.play_pause:{
isPlaying=!isPlaying;
if(isPlaying) {
playOrPauseButton.setImageResource(R.drawable.pause);
}
else {
playOrPauseButton.setImageResource(R.drawable.play);
}
intent.putExtra("tag1",0);
intent.putExtra("state",isPlaying);
}
break;
case R.id.next_music:{
nextMusic();
intent.putExtra("tag1",2);
}
break;
case R.id.music_menu:
Log.d("PlayActivity","press the button music_menu");
showMusicList();
break;
default:
break;
}
sendBroadcast(intent);
}
//根据点击事件更新UI视图
public void previousMusic(){
if((--location)>=0)
{
seekBar.setMax((int)(mp3InfoList.get(location).getDuration()));
currentTimeView.setText("0:00");
durationView.setText(MediaUtil.formatTime(mp3InfoList.get(location).getDuration()));
musicNameView.setText(mp3InfoList.get(location).getTitle());
artistView.setText(mp3InfoList.get(location).getArtist());
playOrPauseButton.setImageResource(R.drawable.pause);
}
}
public void nextMusic(){
if((++location)>=0)
{
seekBar.setMax((int)(mp3InfoList.get(location).getDuration()));
currentTimeView.setText("0:00");
durationView.setText(MediaUtil.formatTime(mp3InfoList.get(location).getDuration()));
musicNameView.setText(mp3InfoList.get(location).getTitle());
artistView.setText(mp3InfoList.get(location).getArtist());
playOrPauseButton.setImageResource(R.drawable.pause);
}
}
//通过AlertDialog显示歌曲列表
public void showMusicList(){
Log.d("PlayActivity","showMusicList start");
LinearLayout linearLayoutMain = new LinearLayout(this);//自定义一个布局文件
linearLayoutMain.setLayoutParams(new LinearLayoutCompat.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
Log.d("PlayActivity","LinearLayout created");
ListView listView = new ListView(this);//this为获取当前的上下文
listView.setFadingEdgeLength(0);
List>musicList=new ArrayList>();
for(int i=0;i
Mapitem=new HashMap();
item.put("musicName",mp3InfoList.get(i).getTitle().toString());
item.put("artist",mp3InfoList.get(i).getArtist().toString());
musicList.add(item);
}
Log.d("PlayActivity","LinearLayout created and itialized");
SimpleAdapter adapter=new SimpleAdapter(PlayActivity.this,musicList,R.layout.music_item
,new String[]{"musicName","artist"}
, new int[]{R.id.music_item_musicName,R.id.music_item_artist});
Log.d("PlayActivity","SimpleAdapter created");
listView.setAdapter(adapter);
linearLayoutMain.addView(listView);
Log.d("PlayActivity","listView was added to the linearLayout");
final AlertDialog dialog=new AlertDialog.Builder(this).setTitle("歌曲列表").setView(linearLayoutMain)
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
dialog.cancel();
}
}).create();
Log.d("PlayActivity","Dialog created");
dialog.show();
Log.d("PlayActivity","Dialog showed");
//响应子项点击事件
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView adapterView, View view, int i, long l) {
//更新自身UI
musicNameView.setText(mp3InfoList.get(i).getTitle());
artistView.setText(mp3InfoList.get(i).getArtist());
durationView.setText(MediaUtil.formatTime(mp3InfoList.get(i).getDuration()));
//发送广播附带歌曲下标给MainActivity来控制服务播放歌曲
Intent intent=new Intent("com.example.musicplayer.react_to_playactiity");
intent.putExtra("tag1",4);
intent.putExtra("location",i);
sendBroadcast(intent);
Log.d("PlayActivity","broadcast sended");
dialog.cancel();
Log.d("PlayActivity","Dialog canceled");
}
});
}
}
5 MusicService 创建服务类
public class MusicService extends Service {
List mp3InfoList = new ArrayList<>();
MediaPlayer mediaPlayer;
Mp3Info mp3Info;
Notification notification;
static int location;
int position;
static Boolean isPlaying=false;
RemoteViews contecntViews;
public MusicService() {
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
mediaPlayer=new MediaPlayer();
//获得歌曲Mp3Info类列表
mp3InfoList = MediaUtil.getMp3InfoList(MusicService.this);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.d("MusicService", "service onStartommand");
int tag= intent.getIntExtra("tag", -1);
switch (tag) {
case 0: {
isPlaying=true;
location=intent.getIntExtra("location",-1);
mp3Info=mp3InfoList.get(location);
String url = mp3Info.getUrl();
String title=mp3Info.getTitle();
String artist=mp3Info.getArtist();
long id=mp3Info.getId();
long albumId=mp3Info.getAlbumId();
try {
if (mediaPlayer != null) {
mediaPlayer.reset();
}
mediaPlayer.setDataSource(this, Uri.parse(url));
mediaPlayer.prepare();
mediaPlayer.start();
showNotification(title,artist,id,albumId);
} catch (IOException e) {
e.printStackTrace();
}
}break;
case 1:{
if(mediaPlayer!=null) {
if (mediaPlayer.isPlaying()) {
mediaPlayer.pause();
} else mediaPlayer.start();
}
isPlaying=intent.getBooleanExtra("state",false);
if(isPlaying==true)
isPlaying=false;
else
isPlaying=true;
}break;
case 2:{
isPlaying=true;
int progress=intent.getIntExtra("progress",0);
if(mediaPlayer!=null){
mediaPlayer.seekTo(progress);
}
}break;
case 3:{
mediaPlayer.stop();
try{
mediaPlayer.prepare();
mediaPlayer.seekTo(0);}
catch (Exception e){
e.printStackTrace();
}
} break;
}
//
new PlayProgress().execute();
//设置自动播放下一首
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
if(mediaPlayer!=null){
try {
if (++location < mp3InfoList.size()) {
mediaPlayer.reset();
mediaPlayer.setDataSource(MusicService.this, Uri.parse(mp3InfoList.get(location).getUrl()));
mediaPlayer.prepare();
mediaPlayer.start();
}
}catch (Exception e){
e.printStackTrace();
}
}
//通过发送广播让MainActivity,PlayActivity更新UI
Intent intent=new Intent("com.example.musicplayer.order_play");
intent.putExtra("location",location);
sendBroadcast(intent);
//后台更新NotificationUI
isPlaying=true;
mp3Info=mp3InfoList.get(location);
String title=mp3Info.getTitle();
String artist=mp3Info.getArtist();
long id=mp3Info.getId();
long albumId=mp3Info.getAlbumId();
showNotification(title,artist,id,albumId);
}
});
return super.onStartCommand(intent, flags, startId);
}
public class PlayProgress extends AsyncTask{
@Override
public void onPreExecute(){
super.onPreExecute();
}
@Override
public Integer doInBackground(Void...parms){
while (true){
try{
Thread.sleep(500);
}
catch (Exception e){
e.printStackTrace();
}
position=mediaPlayer.getCurrentPosition();
if(position
Intent mIntent=new Intent("com.example.musicplayer.update_seekbar");
mIntent.putExtra("position",position);
sendBroadcast(mIntent);
}else{
break;
}
}
return 0;
}
@Override
protected void onPostExecute(Integer integer) {
Log.d("===","异步类执行完毕");
super.onPostExecute(integer);
}
}
//通知栏
public void showNotification(String title, String artist, long id, long albumId){
NotificationManager manager=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
NotificationCompat.Builder builder= new NotificationCompat.Builder(this);
contecntViews =new RemoteViews(getPackageName(),R.layout.notification_music);
contecntViews.setTextViewText(R.id.notification_musicName,title);
contecntViews.setTextViewText(R.id.notification_artist,artist);
Bitmap bitmap = MediaUtil.getArtwork(this, id,
albumId, true, false);// 获取专辑位图对象，为大图
contecntViews.setImageViewBitmap(R.id.notification_imageView,bitmap);
contecntViews.setOnClickPendingIntent(R.id.notification_previousMusic,PendingIntent.getBroadcast(this,0,
new Intent("com.example.musicplayer.notification.previous").putExtra("tag2",0), PendingIntent.FLAG_UPDATE_CURRENT));
contecntViews.setOnClickPendingIntent(R.id.notification_play_pause,PendingIntent.getBroadcast(this,0,
new Intent("com.example.musicplayer.notification.play_pause").putExtra("tag2",1).putExtra("state",!isPlaying), PendingIntent.FLAG_UPDATE_CURRENT));
contecntViews.setOnClickPendingIntent(R.id.notification_next,PendingIntent.getBroadcast(this,0,
new Intent("com.example.musicplayer.notification.next").putExtra("tag2",2), PendingIntent.FLAG_UPDATE_CURRENT));
notification=builder.setContent(contecntViews).setSmallIcon(R.mipmap.ic_launcher).build();
manager.notify(0,notification);
}
@Override
public void onDestroy(){
super.onDestroy();
mediaPlayer.stop();
mediaPlayer.release();
}
}
上面就是这个Demo的全部内容，还有很多不足（也可以说是不少bug）和程序运行期间会出现一些闪退的现象，限于本人目前水平有限，希望日后经过更深入学习能回来解决现在留下的问题。