最进想通过MediaPlayer实现播放一个视频，并且SeekBar可拖动的功能，记录下来，以便查阅！

实现效果如下：

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

android:id="@+id/surfaceview"

android:layout_width="fill_parent"

android:layout_height="600dp" />

android:id="@+id/seekBar"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:max="100"/>

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="horizontal" >

android:id="@+id/start"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="播放" />

android:id="@+id/pause"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="暂停" />

android:id="@+id/stop"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="停止" />

package com.Javen;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.SurfaceView;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.Window;

import android.widget.Button;

import android.widget.SeekBar;

import android.widget.SeekBar.OnSeekBarChangeListener;

public class VideoPlayTestActivity extends Activity implements OnClickListener{

/** Called when the activity is first created. */

private SurfaceView surfaceView = null;

private Button startButton, pauseButton, stopButton;

private SeekBar seekBar = null;

private Player player = null;

private static final String TAG = "VideoPlayTestActivity";

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.main);

findView();

player = new Player(surfaceView, seekBar);

}

private void findView()

{

surfaceView = (SurfaceView)findViewById(R.id.surfaceview);

seekBar = (SeekBar)findViewById(R.id.seekBar);

startButton = (Button)findViewById(R.id.start);

pauseButton = (Button)findViewById(R.id.pause);

stopButton = (Button)findViewById(R.id.stop);

startButton.setOnClickListener(this);

pauseButton.setOnClickListener(this);

stopButton.setOnClickListener(this);

seekBar.setOnSeekBarChangeListener(SeekBarLinstener);

}

@Override

public void onClick(View v)

{

// TODO Auto-generated method stub

int id = v.getId();

switch (id)

{

case R.id.start:

player.playPath("/mnt/usb/sda1/test.rmvb");

break;

case R.id.pause:

player.pause();

break;

case R.id.stop:

player.stop();

break;

default:

break;

}

}

OnSeekBarChangeListener SeekBarLinstener = new OnSeekBarChangeListener()

{

int progress;

@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);

}

@Override

public void onStartTrackingTouch(SeekBar seekBar)

{

}

@Override

public void onProgressChanged(SeekBar seekBar, int arg0,

boolean fromUser)

{

/**

* 这里的arg0是百分比，即拖动位置暂全部视频的百分位置

* this.progress则是相当影片的总体时间的长度

*/

this.progress = arg0 * player.mediaPlayer.getDuration()/seekBar.getMax();

Log.d(TAG,"arg0 ="+arg0+" this.progress="+this.progress);

}

};

}

package com.Javen;

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.view.SurfaceHolder;

import android.view.SurfaceView;

import android.widget.SeekBar;

public class Player implements SurfaceHolder.Callback, OnBufferingUpdateListener, OnCompletionListener, MediaPlayer.OnPreparedListener

{

public MediaPlayer mediaPlayer;

public SurfaceHolder surfaceHolder;

private SeekBar playerSeekBar;

private int videoWidth, videoHeight;

private Timer timer;

public Player(SurfaceView surfaceView, SeekBar seekBar)

{

super();

this.playerSeekBar = seekBar;

surfaceHolder = surfaceView.getHolder();

surfaceHolder.addCallback(this);

surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

timer = new Timer();

timer.schedule(timerTask, 0, 1000);//使用TimerTask实现更新seekBar的进度条

}

TimerTask timerTask = new TimerTask()

{

public void run()

{

if(mediaPlayer == null)

return;

if(mediaPlayer.isPlaying() && playerSeekBar.isPressed()== false)

{

handlerProgress.sendEmptyMessage(0);

}

};

};

Handler handlerProgress = new Handler()

{

public void handleMessage(android.os.Message msg)

{

switch (msg.what)

{

case 0:

int position = mediaPlayer.getCurrentPosition();//获取当前播放的影片文件位置

int duration = mediaPlayer.getDuration();//获取影片总文件大小位置

if(duration > 0)

{

long pos = playerSeekBar.getMax() * position/duration;

playerSeekBar.setProgress((int)pos);

}

break;

default:

break;

}

};

};

public void pause()

{

if(mediaPlayer != null)

{

mediaPlayer.pause();

}

}

public void start()

{

if(mediaPlayer != null)

{

mediaPlayer.start();

}

}

public void stop()

{

if(mediaPlayer != null)

{

mediaPlayer.stop();

mediaPlayer.release();

mediaPlayer = null;

}

}

public void playPath(String path)

{

try

{

if(mediaPlayer != null)

{

mediaPlayer.reset();

mediaPlayer.setDataSource(path);//设置播放影片路径

mediaPlayer.prepare();//做播放影片前的准备

}

} catch (IllegalArgumentException e)

{

// TODO Auto-generated catch block

e.printStackTrace();

} catch (SecurityException 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();

}

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width,

int height)

{

}

@Override

public void surfaceCreated(SurfaceHolder holder)

{

mediaPlayer = new MediaPlayer();

mediaPlayer.setDisplay(surfaceHolder);//mediaPlayer绑定surfaceHolder

mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);//设置音频流类型

mediaPlayer.setOnBufferingUpdateListener(this);//监听网络变化

mediaPlayer.setOnPreparedListener(this);//监听影片是否ready OK

mediaPlayer.setOnCompletionListener(this);//监听影片是否播放完全

}

@Override

public void surfaceDestroyed(SurfaceHolder holder)

{

}

@Override

public void onPrepared(MediaPlayer mp)

{

//影片ready好后，通过mediaPlayer的长宽判断是否有影片

videoHeight = mediaPlayer.getVideoHeight();

videoWidth = mediaPlayer.getVideoWidth();

if(videoHeight != 0 && videoWidth != 0)

{

mp.start();//start播放视频

}

}

@Override

public void onCompletion(MediaPlayer mp)

{

//播放完影片后调用

}

@Override

public void onBufferingUpdate(MediaPlayer mp, int percent)

{

// TODO Auto-generated method stub

playerSeekBar.setSecondaryProgress(percent);//seekBar的二级进度条

}

}