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這篇文章將為大家詳細(xì)講解有關(guān)在Android怎么快速完成簡易的音樂播放器,小編覺得挺實(shí)用的,因此分享給大家做個(gè)參考,希望大家閱讀完這篇文章后可以有所收獲。
導(dǎo)入項(xiàng)目所需的音樂文件、圖標(biāo)、背景等
1.創(chuàng)建一個(gè)raw文件夾,將音樂文件導(dǎo)入到這個(gè)文件夾中,方便我們?cè)陧?xiàng)目中使用
2.在drawable中導(dǎo)入所需的圖片、圖標(biāo)
設(shè)計(jì)UI界面
1.設(shè)計(jì)5個(gè)button控件,分別對(duì)應(yīng)上一曲,下一曲,暫停,播放,退出
2.設(shè)計(jì)3個(gè)TextView,分別對(duì)應(yīng)歌曲的介紹信息、歌曲的進(jìn)度(歌曲的總時(shí)間和歌曲當(dāng)前播放的時(shí)間)、歌曲的名字
service服務(wù)的編寫
創(chuàng)建一個(gè)MusicService對(duì)象繼承Service
MusicService所需要的成員變量
MyReceiver serviceReceiver; Thread processThread; AssetManager am;//是附件管理器,用于根據(jù)文件名找到文件所在并打開文件 String[] musics = new String[]{"legendsneverdie.mp3", "promise.mp3", "beautiful.mp3"};//默認(rèn)顯示的歌曲信息 MediaPlayer mPlayer; // 當(dāng)前的狀態(tài),0x11代表沒有播放;0x12代表正在播放;0x13代表暫停 int status = 0x11; // 記錄當(dāng)前正在播放的音樂 int current = 0;
實(shí)現(xiàn)循環(huán)播放
public void onCreate() { super.onCreate(); am = getAssets(); // 創(chuàng)建BroadcastReceiver serviceReceiver = new MyReceiver(); // 創(chuàng)建IntentFilter IntentFilter filter = new IntentFilter(); filter.addAction(MainActivity.CTL_ACTION); registerReceiver(serviceReceiver, filter); // 創(chuàng)建MediaPlayer mPlayer = new MediaPlayer(); // 為MediaPlayer播放完成事件綁定監(jiān)聽器 mPlayer.setOnCompletionListener(new OnCompletionListener() { @Override public void onCompletion(MediaPlayer mp) { Log.d("musicService", "播放完成"); current++; if (current >= 3) { current = 0; } // 準(zhǔn)備并播放音樂 prepareAndPlay(musics[current]); //發(fā)送廣播通知Activity更改文本框 Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION); sendIntent.putExtra("current", current); sendIntent.putExtra("currentTime", mPlayer.getCurrentPosition()); sendIntent.putExtra("totalTime", mPlayer.getDuration()); // 發(fā)送廣播,將被Activity組件中的BroadcastReceiver接收到 sendBroadcast(sendIntent); } }); private void prepareAndPlay(String music) { try { // 打開指定音樂文件 AssetFileDescriptor afd = am.openFd(music); mPlayer.reset(); // 使用MediaPlayer加載指定的聲音文件。 mPlayer.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength()); // 準(zhǔn)備聲音 mPlayer.prepare(); // 播放 mPlayer.start(); } catch (IOException e) { e.printStackTrace(); } }
實(shí)現(xiàn)刷新進(jìn)度條
processThread = new Thread(new Runnable() { @Override public void run() { while (true) { if (status == 0x12) { try { Thread.sleep(1000); Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION); sendIntent.putExtra("current", current); sendIntent.putExtra("currentTime", mPlayer.getCurrentPosition()); sendIntent.putExtra("totalTime", mPlayer.getDuration()); // 發(fā)送廣播,將被Activity組件中的BroadcastReceiver接收到 sendBroadcast(sendIntent); } catch (InterruptedException e) { e.printStackTrace(); } } } } }); processThread.start(); }
廣播通信接收器的實(shí)現(xiàn)(用于實(shí)現(xiàn)和activity的通信)
public class MyReceiver extends BroadcastReceiver { @Override public void onReceive(final Context context, Intent intent) { int control = intent.getIntExtra("control", -1); Log.d("musicReceiver", "收到廣播, control=" + control); switch (control) { // 播放或暫停 case 1: // 原來處于沒有播放狀態(tài) if (status == 0x11) { // 準(zhǔn)備并播放音樂 prepareAndPlay(musics[current]); status = 0x12; } // 原來處于播放狀態(tài) else if (status == 0x12) { // 暫停 mPlayer.pause(); // 改變?yōu)闀和顟B(tài) status = 0x13; } // 原來處于暫停狀態(tài) else if (status == 0x13) { // 播放 mPlayer.start(); // 改變狀態(tài) status = 0x12; } break; // 下一首 case 2: if (status == 0x12 || status == 0x13) { mPlayer.stop(); if (current + 1 >= musics.length) { current = 0; } else { current++; } prepareAndPlay(musics[current]); status = 0x12; break; } // 上一首 case 3: if (status == 0x12 || status == 0x13) { mPlayer.stop(); if (current - 1 < 0) { current = musics.length - 1; } else { current--; } prepareAndPlay(musics[current]); status = 0x12; } } // 廣播通知Activity更改圖標(biāo)、文本框 Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION); sendIntent.putExtra("update", status); sendIntent.putExtra("current", current); // 發(fā)送廣播,將被Activity組件中的BroadcastReceiver接收到 sendBroadcast(sendIntent); } }
activity的實(shí)現(xiàn)
初始化和動(dòng)態(tài)綁定接收器
// 獲取界面中顯示歌曲標(biāo)題、作者文本框 TextView title, author, currentTime, totalTime; // 播放/暫停、停止按鈕 ImageButton play; ImageView lastMusic, nextMusic; // 進(jìn)度條 ProgressBar progressBar; ActivityReceiver activityReceiver; public static final String CTL_ACTION = "org.xr.action.CTL_ACTION"; public static final String UPDATE_ACTION = "org.xr.action.UPDATE_ACTION"; // 定義音樂的播放狀態(tài),0x11代表沒有播放;0x12代表正在播放;0x13代表暫停 int status = 0x11; String[] titleStrs = new String[]{"Legends Never Die", "約定", "美麗新世界"}; String[] authorStrs = new String[]{"英雄聯(lián)盟", "周蕙", "伍佰"}; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // 獲取程序界面界面中的兩個(gè)按鈕 play = (ImageButton) this.findViewById(R.id.play); lastMusic = this.findViewById(R.id.lastMusic); nextMusic = this.findViewById(R.id.nextMusic); title = (TextView) findViewById(R.id.title); author = (TextView) findViewById(R.id.author); currentTime = findViewById(R.id.currentTime); totalTime = findViewById(R.id.totalTime); progressBar = findViewById(R.id.progressBar); // 為兩個(gè)按鈕的單擊事件添加監(jiān)聽器 play.setOnClickListener(this); lastMusic.setOnClickListener(this); nextMusic.setOnClickListener(this); activityReceiver = new ActivityReceiver(); // 創(chuàng)建IntentFilter IntentFilter filter = new IntentFilter(); // 指定BroadcastReceiver監(jiān)聽的Action filter.addAction(UPDATE_ACTION); // 注冊(cè)BroadcastReceiver registerReceiver(activityReceiver, filter); Intent intent = new Intent(this, MusicService.class); // 啟動(dòng)后臺(tái)Service startService(intent); }
設(shè)置activity的廣播接收器(接收service發(fā)送過來的廣播)
public void onReceive(Context context, Intent intent) { // 獲取Intent中的update消息,update代表播放狀態(tài) int update = intent.getIntExtra("update", -1); // 獲取Intent中的current消息,current代表當(dāng)前正在播放的歌曲 int current = intent.getIntExtra("current", -1); int totalPosition = intent.getIntExtra("totalTime", -1); int currentPosition = intent.getIntExtra("currentTime", -1); Log.d("activityReceiver", "收到廣播"); Log.d("activityReceiver", "current:" + current + " totalPosition:" + totalPosition + " currentPosition:" + currentPosition + " update:" + update); if (current >= 0) { title.setText(titleStrs[current]); author.setText(authorStrs[current]); } if (totalPosition >= 0) { SimpleDateFormat simpleDateFormat = new SimpleDateFormat("mm:ss", Locale.CHINA); Date date = new Date(totalPosition); String formatTime = simpleDateFormat.format(date); totalTime.setText(formatTime); } if (currentPosition >= 0) { double process = ((double)currentPosition / totalPosition)*100; Log.d("activityReceiver", "當(dāng)前進(jìn)度:" + (double)currentPosition/totalPosition); SimpleDateFormat simpleDateFormat = new SimpleDateFormat("mm:ss", Locale.CHINA); Date date = new Date(currentPosition); String formatTime = simpleDateFormat.format(date); progressBar.setProgress((int) process); currentTime.setText(formatTime); } switch (update) { case 0x11: play.setImageResource(R.drawable.play); status = 0x11; break; // 控制系統(tǒng)進(jìn)入播放狀態(tài) case 0x12: // 播放狀態(tài)下設(shè)置使用暫停圖標(biāo) play.setImageResource(R.drawable.pause); // 設(shè)置當(dāng)前狀態(tài) status = 0x12; break; // 控制系統(tǒng)進(jìn)入暫停狀態(tài) case 0x13: // 暫停狀態(tài)下設(shè)置使用播放圖標(biāo) play.setImageResource(R.drawable.play); // 設(shè)置當(dāng)前狀態(tài) status = 0x13; break; } }
實(shí)現(xiàn)圖標(biāo)的點(diǎn)擊功能
// 創(chuàng)建Intent Intent intent = new Intent("org.xr.action.CTL_ACTION"); switch (source.getId()) { // 按下播放/暫停按鈕 case R.id.play: intent.putExtra("control", 1); break; case R.id.lastMusic: intent.putExtra("control", 3); case R.id.nextMusic: intent.putExtra("control", 2); } // 發(fā)送廣播,將被Service組件中的BroadcastReceiver接收到 sendBroadcast(intent); }
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