本文介绍MediaPlayer的使用。MediaPlayer可以播放音频和视频，另外也可以通过VideoView来播放视频，虽然VideoView比MediaPlayer简单易用，但定制性不如用MediaPlayer，要视情况选择了。MediaPlayer播放音频比较简单，但是要播放视频就需要SurfaceView。SurfaceView比普通的自定义View更有绘图上的优势，它支持完全的OpenGL ES库。
先贴出本文程序运行结果的截图，上面是播放/停止音频，可用SeekBar来调进度，下面是播放/停止视频，也是用SeekBar来调进度：
main.xml的源码:
本文程序的源码，有点长：
package com.testMedia;
import java.io.IOException;import java.util.Timer;import java.util.TimerTask;import android.app.Activity;import android.media.AudioManager;import android.media.MediaPlayer;import android.os.Bundle;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.widget.Button;import android.widget.SeekBar;import android.widget.Toast;
public class testMedia extends Activity {/** Called when the activity is first created. */
private SeekBar skb_audio=null;private Button btn_start_audio = null;private Button btn_stop_audio = null;
private SeekBar skb_video=null;private Button btn_start_video = null;private Button btn_stop_video = null;private SurfaceView surfaceView;private SurfaceHolder surfaceHolder;
private MediaPlayer m = null;private Timer mTimer;private TimerTask mTimerTask;
private boolean isChanging=false;//互斥变量，防止定时器与SeekBar拖动时进度冲突@Override public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);
//----------Media控件设置---------// m=new MediaPlayer();
//播放结束之后弹出提示m.setOnCompletionListener(new MediaPlayer.OnCompletionListener(){@Override public void onCompletion(MediaPlayer arg0) {Toast.makeText(testMedia.this, "结束", 1000).show();m.release();}});
//----------定时器记录播放进度---------// mTimer = new Timer();mTimerTask = new TimerTask() {@Override public void run() {if(isChanging==true) return;
if(m.getVideoHeight()==0) skb_audio.setProgress(m.getCurrentPosition());else skb_video.setProgress(m.getCurrentPosition());}};
mTimer.schedule(mTimerTask, 0, 10);
btn_start_audio = (Button) this.findViewById(R.id.Button01);btn_stop_audio = (Button) this.findViewById(R.id.Button02);btn_start_audio.setOnClickListener(new ClickEvent());btn_stop_audio.setOnClickListener(new ClickEvent());skb_audio=(SeekBar)this.findViewById(R.id.SeekBar01);skb_audio.setOnSeekBarChangeListener(new SeekBarChangeEvent());
btn_start_video = (Button) this.findViewById(R.id.Button03);btn_stop_video = (Button) this.findViewById(R.id.Button04);btn_start_video.setOnClickListener(new ClickEvent());btn_stop_video.setOnClickListener(new ClickEvent());skb_video=(SeekBar)this.findViewById(R.id.SeekBar02);skb_video.setOnSeekBarChangeListener(new SeekBarChangeEvent());surfaceView = (SurfaceView) findViewById(R.id.SurfaceView01);surfaceHolder = surfaceView.getHolder();surfaceHolder.setFixedSize(100, 100);surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);}
/** 按键事件处理*/ class ClickEvent implements View.OnClickListener{@Override public void onClick(View v) {if(v==btn_start_audio){m.reset();//恢复到未初始化的状态m=MediaPlayer.create(testMedia.this, R.raw.big);//读取音频skb_audio.setMax(m.getDuration());//设置SeekBar的长度try {m.prepare(); //准备} catch (IllegalStateException e) {// TODO Auto-generated catch block e.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch block e.printStackTrace();}m.start(); //播放}else if(v==btn_stop_audio || v==btn_stop_video){m.stop();}else if(v==btn_start_video){m.reset();//恢复到未初始化的状态m=MediaPlayer.create(testMedia.this, R.raw.test);//读取视频skb_video.setMax(m.getDuration());//设置SeekBar的长度m.setAudioStreamType(AudioManager.STREAM_MUSIC);m.setDisplay(surfaceHolder);//设置屏幕
try {m.prepare();
} 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();}m.start();}}}
/** SeekBar进度改变事件*/ class SeekBarChangeEvent implements SeekBar.OnSeekBarChangeListener{
@Override public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stub
}
@Override public void onStartTrackingTouch(SeekBar seekBar) {isChanging=true;}
@Override public void onStopTrackingTouch(SeekBar seekBar) {m.seekTo(seekBar.getProgress());isChanging=false;}
}
}以上就是21天学习android开发教程第一篇关于MediaPlayer的相关介绍，希望对大家的学习有所帮助。
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