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> 

Step 3 :主控制程序MainActivity.java的实现,代码如下:

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. */@Overridepublic 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{@Overridepublic 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);  }  }  }

播放器实现功能如下：

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() {@Overridepublic 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");}@Overridepublic void onCompletion(MediaPlayer arg0) {Log.e("mediaPlayer", "onCompletion");}@Overridepublic 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 implementsandroid.media.MediaPlayer.OnPreparedListener {private int playPosition;public MyPreparedListener(int playPosition) {this.playPosition = playPosition;}@Overridepublic void onPrepared(MediaPlayer mp) {mediaPlayer.start();// 开始播放if (playPosition > 0) {mediaPlayer.seekTo(playPosition);}}}}

Step 4:由于加入了监听电话的功能，所以要在AndroidManifest.xml中配置权限

<?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>

Step 5: 运行效果如下,一首动听的Avril Lavigne - Complicated.mp3在播放...

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  作者：欧阳鹏  欢迎转载，与人分享是进步的源泉！

  转载请保留原文地址：http://blog.csdn.net/ouyang_peng

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