項(xiàng)目要求

基于Broadcast，BroadcastReceiver等與廣播相關(guān)的知識(shí)實(shí)現(xiàn)簡(jiǎn)單的音樂播放功能，包括音樂的播放、暫停、切換、進(jìn)度選擇、音量調(diào)整。

設(shè)計(jì)效果

（進(jìn)度條時(shí)間刷新功能還沒有實(shí)現(xiàn)）

實(shí)現(xiàn)思路

音樂服務(wù)端負(fù)責(zé)播放音樂和收發(fā)廣播的功能。當(dāng)音樂服務(wù)端作為接收器時(shí)，只能接收到主頁(yè)面廣播的控制消息；作為發(fā)送器時(shí)，向主頁(yè)面發(fā)送歌曲信息更新的消息 主頁(yè)面負(fù)責(zé)進(jìn)度條以及音量按鈕的監(jiān)聽，同時(shí)也有收發(fā)廣播的功能。當(dāng)主頁(yè)面作為接收器時(shí)，只能接收到音樂服務(wù)端廣播的歌曲信息更新的消息；作為發(fā)送器時(shí)，向音樂服務(wù)端發(fā)送對(duì)歌曲播放的控制消息。

項(xiàng)目結(jié)構(gòu)圖

主要代碼

1 主頁(yè)面

package com.example.dell.musicbox3;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.media.AudioManager;import android.os.Bundle;import android.view.View;import android.view.Window;import android.widget.ImageButton;import android.widget.SeekBar;import android.widget.TextView;public class MainActivity extends Activity implements View.OnClickListener{// 獲取界面中顯示歌曲標(biāo)題、作者文本框TextView title, author;// 播放/暫停、停止按鈕ImageButton play, next, last;// 聲明音量管理器public AudioManager mAudioManager = null;// 定義進(jìn)度條public static SeekBar audioSeekBar = null;// 定義音量大小public SeekBar audioVolume = null;ActivityReceiver activityReceiver;public static final String CTL_ACTION = 'org.crazyit.action.CTL_ACTION';public static final String UPDATE_ACTION = 'org.crazyit.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[] { '龍卷風(fēng)', '可愛女人', '星晴' };String[] authorStrs = new String[] { 'JayChou', 'JayChou', 'JayChou' };@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.layout);// 獲取程序界面界面中的兩個(gè)按鈕play = (ImageButton) this.findViewById(R.id.play);last = (ImageButton) this.findViewById(R.id.last);next = (ImageButton) this.findViewById(R.id.next);audioVolume = (SeekBar) findViewById(R.id.seekBar2);audioSeekBar = (SeekBar) findViewById(R.id.seekBar1);title = (TextView) findViewById(R.id.title);author = (TextView) findViewById(R.id.author);// 為兩個(gè)按鈕的單擊事件添加監(jiān)聽器play.setOnClickListener(this);last.setOnClickListener(this);next.setOnClickListener(this);// 播放進(jìn)度監(jiān)聽audioSeekBar.setOnSeekBarChangeListener(new SeekBarChangeEvent());// 退出后再次進(jìn)去程序時(shí)，進(jìn)度條保持持續(xù)更新if (MusicService.mPlayer != null) {// 設(shè)置進(jìn)度條的最大值MainActivity.audioSeekBar.setMax(MusicService.mPlayer.getDuration());audioSeekBar.setProgress(MusicService.mPlayer.getCurrentPosition());}// 得到當(dāng)前音量對(duì)象mAudioManager = (AudioManager) getSystemService(AUDIO_SERVICE);// 把當(dāng)前音量值賦給進(jìn)度條audioVolume.setProgress(mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC));// 監(jiān)聽音量audioVolume.setOnSeekBarChangeListener(new AudioVolumeChangeEvent());activityReceiver = new ActivityReceiver();// 創(chuàng)建IntentFilterIntentFilter filter = new IntentFilter();// 指定BroadcastReceiver監(jiān)聽的Actionfilter.addAction(UPDATE_ACTION);// 注冊(cè)BroadcastReceiverregisterReceiver(activityReceiver, filter);Intent intent = new Intent(this, MusicService.class);// 啟動(dòng)后臺(tái)ServicestartService(intent);}// 音量監(jiān)聽class AudioVolumeChangeEvent implements SeekBar.OnSeekBarChangeListener {@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, progress,0);}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {}}// 播放進(jìn)度監(jiān)聽，別忘了Service里面還有個(gè)進(jìn)度條刷新class SeekBarChangeEvent implements SeekBar.OnSeekBarChangeListener {@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {// 假設(shè)改變?cè)从谟脩敉蟿?dòng)if (fromUser) {MusicService.mPlayer.seekTo(progress);// 當(dāng)進(jìn)度條的值改變時(shí)，音樂播放器從新的位置開始播放}}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {MusicService.mPlayer.pause();}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {MusicService.mPlayer.start();}}// 自定義的BroadcastReceiver，負(fù)責(zé)監(jiān)聽從Service傳回來(lái)的廣播public class ActivityReceiver extends BroadcastReceiver{@Overridepublic 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);if (current >= 0){title.setText(titleStrs[current]);author.setText(authorStrs[current]);}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;}}}@Overridepublic void onClick(View source){// 創(chuàng)建IntentIntent intent = new Intent('org.crazyit.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.last:intent.putExtra('control', 2);break;//按下上一首按鈕case R.id.next:intent.putExtra('control', 3);break;}// 發(fā)送廣播，將被Service組件中的BroadcastReceiver接收到sendBroadcast(intent);}}

2 音樂服務(wù)端

package com.example.dell.musicbox3;import java.io.IOException;import android.app.Service;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.res.AssetFileDescriptor;import android.content.res.AssetManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnCompletionListener;import android.os.IBinder;public class MusicService extends Service implements Runnable{MyReceiver serviceReceiver;//asset文件管理對(duì)象AssetManager am;String[] musics = new String[] { '周杰?? - 龍卷風(fēng).mp3', '周杰?? - 星晴.mp3', '周杰?? - 可愛女人.mp3' };public static 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;@Override//非綁定式服務(wù)public IBinder onBind(Intent intent){return null;}@Override//定義初始化函數(shù)public void onCreate(){super.onCreate();//獲取asset文件夾里的所有歌曲am = getAssets();// 創(chuàng)建具有篩選功能的服務(wù)端接收器serviceReceiver = new MyReceiver();// 創(chuàng)建IntentFilter過濾器IntentFilter filter = new IntentFilter();//使音樂服務(wù)端的接收器只能接收客戶端發(fā)來(lái)的CTL_ACTION消息filter.addAction(MainActivity.CTL_ACTION);//注冊(cè)帶有此篩選器且名字叫做serviceReceiver的接收器registerReceiver(serviceReceiver, filter);// 創(chuàng)建MediaPlayermPlayer = new MediaPlayer();// 為MediaPlayer播放完成事件綁定監(jiān)聽器mPlayer.setOnCompletionListener(new OnCompletionListener() // ①{@Overridepublic void onCompletion(MediaPlayer mp){current++;if (current >= 3){current = 0;}//發(fā)送廣播通知Activity更改文本框Intent sendIntent = new Intent(MainActivity.UPDATE_ACTION);sendIntent.putExtra('current', current);// 發(fā)送廣播，將被Activity組件中的BroadcastReceiver接收到sendBroadcast(sendIntent);// 準(zhǔn)備并播放音樂prepareAndPlay(musics[current]);}});}public class MyReceiver extends BroadcastReceiver{@Overridepublic void onReceive(final Context context, Intent intent){int control = intent.getIntExtra('control', -1);switch (control){// 播放或暫停case 1:// 原來(lái)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(lái)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(lái)處于暫停狀態(tài)else if (status == 0x13){// 播放mPlayer.start();// 改變狀態(tài)status = 0x12;}break;// 停止聲音case 2://上一首切換if (current <= 0) {//停止播放mPlayer.stop();//修改currentcurrent = musics.length-1;//播放prepareAndPlay(musics[current]);status = 0x12;}else{mPlayer.stop();current--;prepareAndPlay(musics[current]);status = 0x12;}break;//下一首切換case 3:if (current >= 2) {mPlayer.stop();current = 0;prepareAndPlay(musics[current]);status = 0x12;}else{mPlayer.stop();current++;prepareAndPlay(musics[current]);status = 0x12;}break;}// 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);}}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();// 設(shè)置進(jìn)度條最大值MainActivity.audioSeekBar.setMax(MusicService.mPlayer.getDuration());new Thread(this).start();} catch (IOException e) {e.printStackTrace();}}// 刷新進(jìn)度條public void run() {int CurrentPosition = 0;int total = mPlayer.getDuration();while (mPlayer != null && CurrentPosition < total) {try {Thread.sleep(1000);if (mPlayer != null) {CurrentPosition = mPlayer.getCurrentPosition();}} catch (InterruptedException e) {e.printStackTrace();}MainActivity.audioSeekBar.setProgress(CurrentPosition);}}}

倉(cāng)庫(kù)鏈接

MusicBox

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