我的Android进阶之旅------>Android MediaPlayer播放网络音频的实例--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>

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. */
@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);
}
}

}

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() {
@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);
}
}
}

}

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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