這是我們為大家提供的一篇關於MediaPlayer播放網絡音頻的詳解的文章,接下來就讓我們一起來了解一下吧!
先來看看本文程序運行的結果:
main.xml的源碼如下:
[xhtml] view plaincopyprint?
android:layout_height="fill_parent" android:layout_width="fill_parent">
android:layout_width="fill_parent" android:orientation="vertical"
android:layout_gravity="top">
android:layout_gravity="center_horizontal" android:layout_marginTop="4.0dip"
android:layout_height="wrap_content" android:layout_width="wrap_content">
android:layout_height="wrap_content" android:id="@+id/btnPlayUrl"
android:text="播放網絡音頻">
android:text="暫停" android:layout_width="80dip">
android:layout_width="80dip" android:text="停止" android:id="@+id/btnStop">
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:layout_marginBottom="20dip">
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">
Player.java是本文的核心,Player.java實現了“進度條更新”、“數據緩沖”等功能,雖然不是很復雜的功能,但卻是非常有用的功能。Player.java源碼如下:
[java] view plaincopyprint?
package com.musicplayer;
import java.io.IOException;
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();
public Player(SeekBar skbProgress)
{
this.skbProgress=skbProgress;
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() {
@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);
}
};
};
//*****************************************************
public void play()
{
mediaPlayer.start();
}
public void playUrl(String videoUrl)
{
try {
mediaPlayer.reset();
mediaPlayer.setDataSource(videoUrl);
mediaPlayer.prepare();//prepare之後自動播放
//mediaPlayer.start();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void pause()
{
mediaPlayer.pause();
}
public void stop()
{
if (mediaPlayer != null) {
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = null;
}
}
@Override
/**
* 通過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");
}
}
test_musicplayer.java是主程序,負責調用Player類,其中關鍵部分是SeekBarChangeEvent這個SeekBar拖動的事件:SeekBar的Progress是0~SeekBar.getMax()之內的數,而MediaPlayer.seekTo()的參數是0~MediaPlayer.getDuration()之內數,所以MediaPlayer.seekTo()的參數是(progress/seekBar.getMax())*player.mediaPlayer.getDuration()。
test_musicplayer.java源碼如下:
[java] view plaincopyprint?
package com.musicplayer;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SeekBar;
public class test_musicplayer extends Activity {
private Button btnPause, btnPlayUrl, btnStop;
private SeekBar skbProgress;
private Player player;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.setTitle("在線音樂播放---hellogv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);
bt