Android MediaPlayer播发网络音频的实例-网络mp3播放器

上一篇写了个简单的MP3播放器 ，这次写一个可以播放网络音频资源的播放器

本实例可以实现音乐播放器除了来电的时候会暂停播放，通话结束后恢复播放外，打开其他的Activity都可以继续播放音乐，享受一边听音乐一边做其他的事情。该播放器可以实现进度条的显示，拖动进度条，可以调节播放进度。

Step 1 :新建一个Android工程,命名为AudioNetPlayer

Step 2: 设计UI布局,在main.xml里放入4个ImageButton,代码如下:

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"	android:layout_height="fill_parent" android:layout_width="fill_parent">	<LinearLayout android:layout_height="wrap_content"		android:layout_width="fill_parent" android:orientation="vertical"		android:layout_gravity="top">				<TextView android:layout_width="wrap_content"			android:layout_height="40dp" android:text="@string/file_name"			android:id="@+id/tips" />					<EditText android:layout_width="fill_parent"			android:layout_height="wrap_content" android:id="@+id/file_name"			android:text="http://192.168.153.50:8080/Hello/Complicated.mp3" />					<LinearLayout android:orientation="horizontal"			android:layout_gravity="center_horizontal" android:layout_marginTop="4.0dip"			android:layout_height="wrap_content" android:layout_width="wrap_content">			<Button android:layout_width="80dip"				android:layout_height="wrap_content" android:id="@+id/btnPlayUrl"				android:text="@string/button_play"></Button>			<Button android:layout_height="wrap_content" android:id="@+id/btnPause"				android:text="@string/button_pause" android:layout_width="80dip"></Button>			<Button android:layout_height="wrap_content"				android:layout_width="80dip" android:text="@string/button_stop"				android:id="@+id/btnStop"></Button>			<Button android:layout_height="wrap_content"				android:layout_width="80dip" android:text="@string/button_replay"				android:id="@+id/btnReplay"></Button>		</LinearLayout>				<LinearLayout android:orientation="horizontal"			android:layout_width="fill_parent" android:layout_height="wrap_content"			android:layout_marginBottom="20dip">			<SeekBar android:paddingRight="10dip" android:layout_gravity="center_vertical"				android:paddingLeft="10dip" android:layout_weight="1.0"				android:layout_height="wrap_content" android:layout_width="wrap_content"				android:id="@+id/skbProgress" android:max="100"></SeekBar>		</LinearLayout>	</LinearLayout></FrameLayout> 

package cn.roco.netaudio.player;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.telephony.PhoneStateListener;import android.telephony.TelephonyManager;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.SeekBar;import android.widget.TextView;public class MainActivity extends Activity {	private Button btnPause, btnPlayUrl, btnStop,btnReplay;	private SeekBar skbProgress;	private Player player;	private EditText file_name_text;	private TextView tipsView;	/** Called when the activity is first created. */	@Override	public void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		this.setTitle("在线音乐播放---ouyangpeng编写");  		          btnPlayUrl = (Button) this.findViewById(R.id.btnPlayUrl);          btnPlayUrl.setOnClickListener(new ClickEvent());            btnPause = (Button) this.findViewById(R.id.btnPause);          btnPause.setOnClickListener(new ClickEvent());            btnStop = (Button) this.findViewById(R.id.btnStop);          btnStop.setOnClickListener(new ClickEvent());                 btnReplay = (Button) this.findViewById(R.id.btnReplay);          btnReplay.setOnClickListener(new ClickEvent());                  file_name_text=(EditText) this.findViewById(R.id.file_name);        tipsView=(TextView) this.findViewById(R.id.tips);                skbProgress = (SeekBar) this.findViewById(R.id.skbProgress);          skbProgress.setOnSeekBarChangeListener(new SeekBarChangeEvent());                  String url=file_name_text.getText().toString();        player = new Player(url,skbProgress);                  TelephonyManager telephonyManager=(TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);		telephonyManager.listen(new MyPhoneListener(), PhoneStateListener.LISTEN_CALL_STATE);	}		/**	 * 只有电话来了之后才暂停音乐的播放	 */	private final class MyPhoneListener extends android.telephony.PhoneStateListener{		@Override		public void onCallStateChanged(int state, String incomingNumber) {			switch (state) {			case TelephonyManager.CALL_STATE_RINGING://电话来了				player.callIsComing();				break;			case TelephonyManager.CALL_STATE_IDLE: //通话结束				player.callIsDown();				break;			}		}	}		class ClickEvent implements OnClickListener {          @Override          public void onClick(View arg0) {              if (arg0 == btnPause) {                  boolean pause=player.pause();                  if (pause) {                	btnPause.setText("继续");                	tipsView.setText("音乐暂停播放...");  				}else{					btnPause.setText("暂停");					tipsView.setText("音乐继续播放...");  				}            } else if (arg0 == btnPlayUrl) {                  player.play();                tipsView.setText("音乐开始播放...");            } else if (arg0 == btnStop) {                  player.stop();                  tipsView.setText("音乐停止播放...");              } else if (arg0==btnReplay) {				player.replay();				tipsView.setText("音乐重新播放...");  			}        }      }        class SeekBarChangeEvent implements SeekBar.OnSeekBarChangeListener {          int progress;          @Override          public void onProgressChanged(SeekBar seekBar, int progress,                  boolean fromUser) {              // 原本是(progress/seekBar.getMax())*player.mediaPlayer.getDuration()              this.progress = progress * player.mediaPlayer.getDuration()                      / seekBar.getMax();          }            @Override          public void onStartTrackingTouch(SeekBar seekBar) {            }            @Override          public void onStopTrackingTouch(SeekBar seekBar) {              // seekTo()的参数是相对与影片时间的数字，而不是与seekBar.getMax()相对的数字              player.mediaPlayer.seekTo(progress);          }      }  	}

package cn.roco.netaudio.player;import java.util.Timer;import java.util.TimerTask;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnBufferingUpdateListener;import android.media.MediaPlayer.OnCompletionListener;import android.os.Handler;import android.os.Message;import android.util.Log;import android.widget.SeekBar;public class Player implements OnBufferingUpdateListener, OnCompletionListener,		MediaPlayer.OnPreparedListener {	public MediaPlayer mediaPlayer;	private SeekBar skbProgress;	private Timer mTimer = new Timer();	private String videoUrl;	private boolean pause;	private int playPosition;	public Player(String videoUrl, SeekBar skbProgress) {		this.skbProgress = skbProgress;		this.videoUrl = videoUrl;		try {			mediaPlayer = new MediaPlayer();			mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);			mediaPlayer.setOnBufferingUpdateListener(this);			mediaPlayer.setOnPreparedListener(this);		} catch (Exception e) {			Log.e("mediaPlayer", "error", e);		}		mTimer.schedule(mTimerTask, 0, 1000);	}	/*******************************************************	 * 通过定时器和Handler来更新进度条	 ******************************************************/	TimerTask mTimerTask = new TimerTask() {		@Override		public void run() {			if (mediaPlayer == null)				return;			if (mediaPlayer.isPlaying() && skbProgress.isPressed() == false) {				handleProgress.sendEmptyMessage(0);			}		}	};	Handler handleProgress = new Handler() {		public void handleMessage(Message msg) {			int position = mediaPlayer.getCurrentPosition();			int duration = mediaPlayer.getDuration();			if (duration > 0) {				long pos = skbProgress.getMax() * position / duration;				skbProgress.setProgress((int) pos);			}		};	};	/**	 * 来电话了	 */	public void callIsComing() {		if (mediaPlayer.isPlaying()) {			playPosition = mediaPlayer.getCurrentPosition();// 获得当前播放位置			mediaPlayer.stop();		}	}	/**	 * 通话结束	 */	public void callIsDown() {		if (playPosition > 0) {			playNet(playPosition);			playPosition = 0;		}	}	/**	 * 播放	 */	public void play() {		playNet(0);	}	/**	 * 重播	 */	public void replay() {		if (mediaPlayer.isPlaying()) {			mediaPlayer.seekTo(0);// 从开始位置开始播放音乐		} else {			playNet(0);		}	}	/**	 * 暂停	 */	public boolean pause() {		if (mediaPlayer.isPlaying()) {// 如果正在播放			mediaPlayer.pause();// 暂停			pause = true;		} else {			if (pause) {// 如果处于暂停状态				mediaPlayer.start();// 继续播放				pause = false;			}		}		return pause;	}	/**	 * 停止	 */	public void stop() {		if (mediaPlayer != null && mediaPlayer.isPlaying()) {			mediaPlayer.stop();		}	}	@Override	/**  	 * 通过onPrepared播放  	 */	public void onPrepared(MediaPlayer arg0) {		arg0.start();		Log.e("mediaPlayer", "onPrepared");	}	@Override	public void onCompletion(MediaPlayer arg0) {		Log.e("mediaPlayer", "onCompletion");	}	@Override	public void onBufferingUpdate(MediaPlayer arg0, int bufferingProgress) {		skbProgress.setSecondaryProgress(bufferingProgress);		int currentProgress = skbProgress.getMax()				* mediaPlayer.getCurrentPosition() / mediaPlayer.getDuration();		Log.e(currentProgress + "% play", bufferingProgress + "% buffer");	}	/**	 * 播放音乐	 * 	 * @param playPosition	 */	private void playNet(int playPosition) {		try {			mediaPlayer.reset();// 把各项参数恢复到初始状态			/**			 * 通过MediaPlayer.setDataSource()			 * 的方法,将URL或文件路径以字符串的方式传入.使用setDataSource ()方法时,要注意以下三点:			 * 1.构建完成的MediaPlayer 必须实现Null 对像的检查.			 * 2.必须实现接收IllegalArgumentException 与IOException			 * 等异常,在很多情况下,你所用的文件当下并不存在. 3.若使用URL 来播放在线媒体文件,该文件应该要能支持pragressive			 * 下载.			 */			mediaPlayer.setDataSource(videoUrl);			mediaPlayer.prepare();// 进行缓冲			mediaPlayer.setOnPreparedListener(new MyPreparedListener(					playPosition));		} catch (Exception e) {			e.printStackTrace();		}	}	private final class MyPreparedListener implements			android.media.MediaPlayer.OnPreparedListener {		private int playPosition;		public MyPreparedListener(int playPosition) {			this.playPosition = playPosition;		}		@Override		public void onPrepared(MediaPlayer mp) {			mediaPlayer.start();// 开始播放			if (playPosition > 0) {				mediaPlayer.seekTo(playPosition);			}		}	}}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"	package="cn.roco.netaudio.player" android:versionCode="1"	android:versionName="1.0">	<uses-sdk android:minSdkVersion="8" />	<uses-permission android:name="android.permission.INTERNET" />	<!-- 注意：这里要加入一个监听电话的权限 -->	<uses-permission android:name="android.permission.READ_PHONE_STATE"/>	<application android:icon="@drawable/icon" android:label="@string/app_name">		<activity android:name="MainActivity" android:label="@string/app_name">			<intent-filter>				<action android:name="android.intent.action.MAIN" />				<category android:name="android.intent.category.LAUNCHER" />			</intent-filter>		</activity>	</application></manifest>