开发一个简易音乐播放器
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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
//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
Cursor cursor=context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, 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<cursor.getCount();i++){ cursor.moveToNext(); Mp3Info mp3Info=new Mp3Info(); mp3Info.setUrl(cursor.getString(cursor .getColumnIndex(MediaStore.Audio.Media.DATA))); 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<mediaPlayer.getDuration()){ 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 void onStop 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
// 设置点击事件响应结果为发送广播 remoteViews.setOnClickPendingIntent(R.id.notification_next,PendingIntent.getBroadcast(this,0, new Intent("com.example.musicplayer.notification.next").putExtra("tag2",2), PendingIntent.FLAG_UPDATE_CURRENT)); 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<HashMap<String, Object>>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<Map<String,String>>musicList=new ArrayList<Map<String, String>>(); for(int i=0;i<mp3InfoList.size();i++){ Map<String,String>item=new HashMap<String,String>(); 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 List<Mp3Info>getMp3InfoList(Context context){ Cursor cursor=context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null, null); List<Mp3Info>mp3InfoList=new ArrayList<>(); for(int i=0;i<cursor.getCount();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:
<?xml version="1.0" encoding="utf-8"?><android.support.v4.widget.DrawerLayout 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"><RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <android.support.v7.widget.Toolbar 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"/><RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_below="@+id/mainActivity_toolBar" android:background="#FFF"> <ListView android:id="@+id/musicName_list" android:layout_width="match_parent" android:layout_height="440dp" android:textColor="#FFF"/> <RelativeLayout 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"> <SeekBar android:id="@+id/mainActivity_seekBar" android:layout_width="match_parent" android:layout_height="20dp" android:thumb="@drawable/media_player_progress_button" /> <TextView 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"/> <TextView 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"/> </RelativeLayout> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentBottom="true" android:background="#7e7677" android:layout_below="@+id/mainActivity_seekBarLayout"> <ImageView android:id="@+id/album_view" android:layout_width="80dp" android:layout_height="match_parent" /> <TextView 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"/> <TextView 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"/> <ImageButton 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"/> <ImageButton 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"/> <ImageButton 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" /> </RelativeLayout></RelativeLayout></RelativeLayout> <android.support.design.widget.NavigationView 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" > </android.support.design.widget.NavigationView></android.support.v4.widget.DrawerLayout>播放细节界面
<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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" > <RelativeLayout 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"> <Button android:id="@+id/playActivity_return" android:layout_width="45dp" android:layout_height="30dp" android:background="@drawable/back_return_normal"/> <TextView 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"/> <TextView 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" /> </RelativeLayout> <ScrollView 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"> </ScrollView> <RelativeLayout 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"> <SeekBar android:id="@+id/playActivity_seekBar" android:layout_width="match_parent" android:layout_height="20dp" android:thumb="@drawable/media_player_progress_button" /> <TextView 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"/> <TextView 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"/> </RelativeLayout> <RelativeLayout 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"> <ImageButton android:id="@+id/stop" android:layout_width="50dp" android:layout_margin="10dp" android:layout_height="match_parent" app:srcCompat="@drawable/stop"/> <ImageButton 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"/> <ImageButton 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" /> <ImageButton 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" /> <ImageButton 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" /> </RelativeLayout></RelativeLayout>4 MainActivity编程
public class MainActivity extends AppCompatActivity { static ListView listView; List<Mp3Info>mp3InfoList; 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<mp3InfoList.size();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)<mp3InfoList.size()){ 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; List<Mp3Info>mp3InfoList=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<Map<String,String>>musicList=new ArrayList<Map<String, String>>(); for(int i=0;i<mp3InfoList.size();i++){ Map<String,String>item=new HashMap<String,String>(); 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<Mp3Info> 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<Void,Integer,Integer>{ @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<mediaPlayer.getDuration()){ 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。
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