本人初學Android，最近做了一個實現安卓簡單音樂播放功能的播放器，收獲不少，于是便記錄下來自己的思路與知識總結，重溫自己的探索之路。
1 ?那么先上幾張截圖來看下程序實現效果吧
2 可以看出基本實現的功能有
暫停（播放），上（下）一首，停止播放
點擊列表中歌曲進行播放，點擊按鈕以彈出歌曲列表
屏幕上顯示歌曲名稱，演唱者，專輯圖片
顯示播放進度條，拖拽進度條以控制播放
通知欄中顯示相關信息，并可在通知欄上控制播放
3 總體開發思路
一共有兩個Activity界面（分別是主界面和播放細節界面），一個用以在后臺播放音樂的Service，一個可以和用戶進行交互Notificatication。為了能夠使得活動與活動，活動與服務，活動與通知之間通信，采取發送廣播的做法，由于我在MainActivity,PlayActivity,MusicService中都獲取了歌曲信息列表，所以在他們之間直接傳遞歌曲下標location和狀態isPlaying即可
核心是由MainActivity通過startService方法控制Service來進行播放
MainActivity中點擊事件發生后更新自己的UI，同時startService
PlayActivity中點擊事件發生后更新自己UI，發送廣播給MainActivity，讓MainActivity更新UI，startService，從而實現PlayActivity間接控制播放
Notification點擊事件發生后發生廣播給MainActivity，讓MainActivity更新UI，startService，從而實現Notification間接控制播放
4 重要功能實現
1 ?內容提供器 ContentProvider
內容提供器用法一般有兩種: 使用現有的內容提供器和創建自己的內容提供器。
在使用系統自帶的內容提供器，注意要在AndroidManifest中添加權限聲明，如果是危險權限，還要進行運行時權限聲明，這里由于本人手機低于Android6.0系統，顧沒有進行運行時申請。
這里我們使用了安卓自帶媒體庫所提供的接口來訪問數據。詳情看2
2 ?安卓MediaStore
安卓為我們提供了自帶的媒體庫，我們可以直接從中訪問到所需的數據。這個MediaStore包括了多媒體數據庫的所有信息，包括音頻，視頻和圖像,android把所有的多媒體數據庫接口進行了封裝，所有的數據庫不用自己進行創建，直接調用利用ContentResolver去掉用那些封裝好的接口就可以進行數據庫的操作了，實例如下：
1 通過genContentResolver的查詢方法獲得存儲有數據的Cursor對象
Cursor ?cursor=context.getContentResolver()
.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null)
//query方法第一個參數為 Uri：這個Uri代表要查詢的數據庫名稱加上表的名稱，這里我們獲取所有的歌曲信息，后面四個參數為查詢條件和數據排列條件，這里我們都使用null
2獲得了數據結果Cursor對象后，我們讀取數據到程序的思路是：通過移動光標的位置來遍歷cursor的
每一行，然后根據所需提取每一行相應列的信息，并添加到程序的變量中
for(int i=0;i
mp3InfoList.add(mp3Info);
3 ?界面編程
1 SeekBar的實現注意聲明android:thumb="@drawable/media_player_progress_button"http://滑動的光標
2 按鈕ImageButton背景聲明我采用如下：app:srcCompat="@drawable/play"/>
這樣在活動中便可通過button.setDateResource(R.drawable....)來實現背景的切換，如果界面編程中直接使用setBackground方法，到時候會造成按鈕背景的重疊而 ? ? ? ? ?不是切 換的效果（親測）
3 使用ListIView的時候注意要在活動中setAdapter()，并設置響應子項點擊事件(通過開啟服務來播放點擊的那首音樂)
5 Activity
1 點擊專輯圖片時使用startActivity方法由MainActivity進入PlayActivity，并由intent傳遞相關信息
Intent intent=new Intent(MainActivity.this,PlayActivity.class);
intent.putExtra("state",isPlaying);
intent.putExtra("location",location);
startActivity(intent);
2 使用startService方法開啟服務，通過intent傳遞相關信息（case 0:播放所傳遞的location下標那首歌
case 1 :暫停/播放 ? ? case 2：seekBar拖動播放 ? ? case 3： 停止播放）
//傳遞歌曲下標location并啟動服務
Intent intent=new Intent(MainActivity.this,MusicService.class);
intent.putExtra("tag",0);
intent.putExtra("location",location);
startService(intent);
6 ?實現后臺自動播放下一首音樂 ：只需為MediaPlayer對象設置setOnCompletionListener()方法即可，在方法中使歌曲下標+1，播放即可，自動播放下一首后記得發送廣播給
活動和Notification以更新UI
//設置自動播放下一首
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 實現顯示播放進度功能：在Service中創建一個繼承于AsyncTask的類，在該類子線程中線程每0.5秒發送一次帶有當前播放進度的broadcast給活動界面以更新UI
public Integer doInBackground(Void...parms){
//設置while (true)以達到循環不斷的目的
while (true){
try{
Thread.sleep(500);//線程沉睡500毫秒
}
catch (Exception e){
e.printStackTrace();
}
position=mediaPlayer.getCurrentPosition();//獲得mediaPlayer當前播放進度
if(position
Intent mIntent=new Intent("com.example.musicplayer.update_seekbar");
mIntent.putExtra("position",position);
sendBroadcast(mIntent);//發送廣播
}else{
break;
}
}
return 0;
}
8
為SeekBar設置點擊拖動事件，通知seetOnSeekBarChangeListener(...)方法，其中OnSeekBarChangeListener類對象需重寫三個方法，在?public voidonStop TrackingTouch(SeekBar seekBar)方法中發送廣播給Service（帶有Progress信息）
在Service中接收progress信息調用MediaPlayer.seekTo(progress)方法來響應拖動事件
//為SeekBar設置點擊拖動事件
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
使用帶有布局的通知 : 與使用普通通知無異，但給通知使用setContent(RemoteViews remoteViews)方法來設定布局，remoteViews的點擊事件的響應為向MainActivity發送廣播
remoteViews = new RemoteViews(getPackageName(), R.layout.remoteviews_item_dl);//設置RemoteViews的布局? ? ? ? ? ? remoteViews.setTextViewText(R.id.tv_filename, getPackageName());? // 設置標題? ? ? ? ? ? remoteViews.setTextViewText(R.id.tv_content, "this is notification");? // 設置內容
remoteViews.setImageViewBitmap(R.id.notification_imageView,bitmap);//設置控件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));// 設置點擊事件響應結果為發送廣播
Notification notification=new NotificationCompat.builder(this).setContent(remotoViews).build();//構建出帶有特定布局的通知
manager.notify(0,notification);//顯示通知
10
實現點擊按鈕彈出AlertIDialog，在dialog中顯示歌曲列表listView并設置點擊事件，關鍵在于為ListView控件設置適配器：這里使用SimpleAdapter創建（要求綁定的數據是List>數據類型（String為key，第二個參數為對應數據））獲得dialog框架布局LinearoutLayout和歌曲列表布局ListView，并將ListIView添加到框架布局上
建立一個數組存儲listview上顯示的數據
獲取到集合數據
創建SimpleAdapter實例，參數解讀（context,數據數組，listVIew item的布局，key數組，布局id數組），將key儲存的數據賦予布局中相應id控件
為listView設置Adapter
dialog.setView(dialog 框架布局)，dialog.show()
listView設置點擊事件（發送帶有點擊item下標信息的廣播給MainActivity）
//通過AlertDialog顯示歌曲列表
public void showMusicList(){
Log.d("PlayActivity","showMusicList start");
LinearLayout linearLayoutMain = new LinearLayout(this);//自定義一個布局文件
linearLayoutMain.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
Log.d("PlayActivity","LinearLayout created");
ListView listView = new ListView(this);//this為獲取當前的上下文
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");
//響應子項點擊事件
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
//? ? ? ? ? 注意這里的參數第三個參數Item在適配器中的位置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()));? ? ? ? ? ? ? ? //發送廣播附帶歌曲下標給MainActivity來控制服務播放歌曲? ? ? ? ? ? ? ? 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 開發思路的實現細節
1 首先新建保存mp3音樂相關屬性信息的實體類Mp3Info（保存url，title，artist等等）
ublic class Mp3Info {
private String url;//路徑
private String title;//歌曲名
private String artist;//藝術家
private long duration;//歌曲時長
private long id;
private long albumId;//以上兩種Id用以獲取專輯圖片
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類用于從安卓媒體庫中獲取歌曲信息并保存在程序的List中，提供靜態方法給其他代碼來直接復用
public class MediaUtil {
//獲取專輯封面的Uri
private static final Uri albumArtUri = Uri.parse("content://media/external/audio/albumart");
//從安卓媒體庫中獲取歌曲信息并保存在程序的List中,并提供靜態方法給其他類來直接獲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;
}
/**
* 格式化時間，將毫秒轉換為分:秒格式//將long類型轉化為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);
}
/**
* 獲取默認專輯圖片
* @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){ //返回小圖片
return BitmapFactory.decodeStream(context.getResources().openRawResource(R.drawable.music5), null, opts);
}
return BitmapFactory.decodeStream(context.getResources().openRawResource(R.drawable.defaultalbum), null, opts);
}
/**
* 從文件當中獲取專輯封面位圖
* @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;
// 只進行大小判斷
options.inJustDecodeBounds = true;
// 調用此方法得到options得到圖片大小
BitmapFactory.decodeFileDescriptor(fd, null, options);
// 我們的目標是在800pixel的畫面上顯示
// 所以需要調用computeSampleSize得到圖片縮放的比例
options.inSampleSize = 100;
// 我們得到了縮放的比例，現在開始正式讀入Bitmap數據
options.inJustDecodeBounds = false;
options.inDither = false;
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
//根據options參數，減少所需要的內存
bm = BitmapFactory.decodeFileDescriptor(fd, null, options);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return bm;
}
/**
* 獲取專輯封面位圖對象
* @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;
//只進行大小判斷
options.inJustDecodeBounds = true;
//調用此方法得到options得到圖片的大小
BitmapFactory.decodeStream(in, null, options);
/** 我們的目標是在你N pixel的畫面上顯示。 所以需要調用computeSampleSize得到圖片縮放的比例 **/
/** 這里的target為800是根據默認專輯圖片大小決定的，800只是測試數字但是試驗后發現完美的結合 **/
if(small){
options.inSampleSize = computeSampleSize(options, 40);
} else{
options.inSampleSize = computeSampleSize(options, 600);
}
// 我們得到了縮放比例，現在開始正式讀入Bitmap數據
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;
}
/**
* 對圖片進行合適的縮放
* @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 活動界面編程，這里直接上代碼
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="歌曲名稱"
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"
>
播放細節界面
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="歌曲名稱"
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編程
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);
//獲得各個控件并設置點擊事件
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);
//設置各控件初始視圖為上次離開時所播放的歌曲，如果進程已被Kill掉，則為第一首
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);
//專輯圖片點擊事件，進入PlayActivity中，并通過Intent傳遞location和isPlaying狀態
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);
}
});
//暫停、播放按鈕點擊事件
playOrPauseButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
playOrpause();
}
});
//下一首點擊事件
nextButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
nextMusic();
}
});
//從媒體庫中獲得音樂列表并顯示到ListView中,同時設置點擊事件
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);
}
});
//注冊監聽SeekBar變化的監聽器
IntentFilter filter=new IntentFilter();
filter.addAction("com.example.musicplayer.update_seekbar");
UpdateSeekbarBroadcast receiver=new UpdateSeekbarBroadcast();
registerReceiver(receiver,filter);
//監聽PlayActivity的點擊事件
IntentFilter filter1=new IntentFilter();
filter1.addAction("com.example.musicplayer.react_to_playactiity");
PlayActivityBroadcast receiver1=new PlayActivityBroadcast();
registerReceiver(receiver1,filter1);
//注冊監聽Notification的監聽器
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);
//注冊監聽后臺順序播放的監聽器
IntentFilter filter3=new IntentFilter();
filter3.addAction("com.example.musicplayer.order_play");
OrderPlayBroadcast receiver3=new OrderPlayBroadcast();
registerReceiver(receiver3,filter3);
//為SeekBar設置點擊拖動事件
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;
}
//設置播放某一首歌曲
public void setPlay(int location){
//切換播放狀態
isPlaying=true;
//根據要播放的音樂曲目更新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);// 獲取專輯位圖對象，為大圖
albumView.setImageBitmap(bitmap);
//切換播放狀態圖標
playOrPauseButton.setImageResource(R.drawable.pause);
seekBar.setMax((int)mp3Info.getDuration());
currentTiemView.setText("0:00");
durationView.setText(MediaUtil.formatTime(mp3Info.getDuration()));
//傳遞歌曲下標location并啟動服務
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);
}
}
//暫停或繼續播放
public void playOrpause(){
Intent intent=new Intent(MainActivity.this,MusicService.class);
//切換播放狀態并改變狀態圖標
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);
}
//停止播放此首音樂，并將進度條滑至開始處
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);
}
//監聽來自Service的SeekBar變化
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);
}
}
//接收來自PlayActivity的廣播
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);
}
}
}
}
//接收來自Notification的廣播
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;
}
}
}
//接收來自后臺自動播放的廣播以更新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);// 獲取專輯位圖對象，為大圖
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);
//獲得歌曲列表信息
mp3InfoList=MediaUtil.getMp3InfoList(PlayActivity.this);
//獲得各控件實例
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);
//從MainActivity中傳遞過來的數據
Intent intent1=getIntent();
location=intent1.getIntExtra("location",0);
isPlaying=intent1.getBooleanExtra("state",false);
//根據傳遞過來的數據更新UI視圖
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);
//注冊seekBar監聽器
IntentFilter filter=new IntentFilter();
filter.addAction("com.example.musicplayer.update_seekbar");
UpdateSeekbarBroadcast receiver=new UpdateSeekbarBroadcast();
registerReceiver(receiver,filter);
//注冊后臺順序播放的監聽器
IntentFilter filter1=new IntentFilter();
filter1.addAction("com.example.musicplayer.order_play");
OrderPlayBroadcast receiver1=new OrderPlayBroadcast();
registerReceiver(receiver1,filter1);
//為SeekBar設置點擊拖動事件
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);
}
});
//設置各按鈕點擊事件
stop.setOnClickListener(this);
previousMusic.setOnClickListener(this);
playOrPauseButton.setOnClickListener(this);
nextMusic.setOnClickListener(this);
musicList.setOnClickListener(this);
}
//監聽來自Service的SeekBar變化
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);
}
}
//接收來自后臺自動播放的廣播以更新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);
}
//根據點擊事件更新UI視圖
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);
}
}
//通過AlertDialog顯示歌曲列表
public void showMusicList(){
Log.d("PlayActivity","showMusicList start");
LinearLayout linearLayoutMain = new LinearLayout(this);//自定義一個布局文件
linearLayoutMain.setLayoutParams(new LinearLayoutCompat.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
Log.d("PlayActivity","LinearLayout created");
ListView listView = new ListView(this);//this為獲取當前的上下文
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");
//響應子項點擊事件
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()));
//發送廣播附帶歌曲下標給MainActivity來控制服務播放歌曲
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 創建服務類
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();
//獲得歌曲Mp3Info類列表
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();
//設置自動播放下一首
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();
}
}
//通過發送廣播讓MainActivity,PlayActivity更新UI
Intent intent=new Intent("com.example.musicplayer.order_play");
intent.putExtra("location",location);
sendBroadcast(intent);
//后臺更新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("===","異步類執行完畢");
super.onPostExecute(integer);
}
}
//通知欄
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);// 獲取專輯位圖對象，為大圖
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();
}
}
上面就是這個Demo的全部內容，還有很多不足（也可以說是不少bug）和程序運行期間會出現一些閃退的現象，限于本人目前水平有限，希望日后經過更深入學習能回來解決現在留下的問題。
