上一篇寫了個簡單的MP3播放器 ，這次寫一個可以播放網絡音頻資源的播放器

本實例可以實現音樂播放器除了來電的時候會暫停播放，通話結束后恢復播放外，打開其他的Activity都可以繼續播放音樂，享受一邊聽音樂一邊做其他的事情。該播放器可以實現進度條的顯示，拖動進度條，可以調節播放進度。

Step 1 :新建一個Android工程,命名為AudioNetPlayer

Step 2: 設計UI布局,在main.xml里放入4個ImageButton,代碼如下:

<?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的實現,代碼如下:

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("在線音樂播放---ouyangpeng編寫"); 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);}/*** 只有電話來了之后才暫停音樂的播放*/private final class MyPhoneListener extends android.telephony.PhoneStateListener{@Overridepublic void onCallStateChanged(int state, String incomingNumber) {switch (state) {case TelephonyManager.CALL_STATE_RINGING://電話來了player.callIsComing();break;case TelephonyManager.CALL_STATE_IDLE: //通話結束player.callIsDown();break;}}}class ClickEvent implements OnClickListener { @Override public void onClick(View arg0) { if (arg0 == btnPause) { boolean pause=player.pause(); if (pause) {btnPause.setText("繼續");tipsView.setText("音樂暫停播放..."); }else{btnPause.setText("暫停");tipsView.setText("音樂繼續播放..."); }} else if (arg0 == btnPlayUrl) { player.play();tipsView.setText("音樂開始播放...");} else if (arg0 == btnStop) { player.stop(); tipsView.setText("音樂停止播放..."); } else if (arg0==btnReplay) {player.replay();tipsView.setText("音樂重新播放..."); }} } 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()的參數是相對與影片時間的數字，而不是與seekBar.getMax()相對的數字 player.mediaPlayer.seekTo(progress); } } } 播放器實現功能如下：
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);}/******************************************************** 通過定時器和Handler來更新進度條******************************************************/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);}};};/*** 來電話了*/public void callIsComing() {if (mediaPlayer.isPlaying()) {playPosition = mediaPlayer.getCurrentPosition();// 獲得當前播放位置mediaPlayer.stop();}}/*** 通話結束*/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);// 從開始位置開始播放音樂} else {playNet(0);}}/*** 暫停*/public boolean pause() {if (mediaPlayer.isPlaying()) {// 如果正在播放mediaPlayer.pause();// 暫停pause = true;} else {if (pause) {// 如果處于暫停狀態mediaPlayer.start();// 繼續播放pause = false;}}return pause;}/*** 停止*/public void stop() {if (mediaPlayer != null && mediaPlayer.isPlaying()) {mediaPlayer.stop();}}@Override/** * 通過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");}/*** 播放音樂* * @param playPosition*/private void playNet(int playPosition) {try {mediaPlayer.reset();// 把各項參數恢復到初始狀態/*** 通過MediaPlayer.setDataSource()* 的方法,將URL或文件路徑以字符串的方式傳入.使用setDataSource ()方法時,要注意以下三點:* 1.構建完成的MediaPlayer 必須實現Null 對像的檢查.* 2.必須實現接收IllegalArgumentException 與IOException* 等異常,在很多情況下,你所用的文件當下并不存在. 3.若使用URL 來播放在線媒體文件,該文件應該要能支持pragressive* 下載.*/mediaPlayer.setDataSource(videoUrl);mediaPlayer.prepare();// 進行緩沖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();// 開始播放if (playPosition > 0) {mediaPlayer.seekTo(playPosition);}}}} Step 4:由于加入了監聽電話的功能，所以要在AndroidManifest.xml中配置權限
<?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：這里要加入一個監聽電話的權限 --><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: 運行效果如下,一首動聽的Avril Lavigne - Complicated.mp3在播放...

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? 作者：歐陽鵬 ?歡迎轉載，與人分享是進步的源泉！

? 轉載請保留原文地址：http://blog.csdn.net/ouyang_peng

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轉載于:https://www.cnblogs.com/ouyangpeng/archive/2013/04/09/8538413.html

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