Android多媒体之MediaPlayer

package com.example.musicplay;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SeekBar;
//import android.widget.SeekBar.OnSeekBarChangeListener;

&＃64;SuppressLint("HandlerLeak")
public class MusicActivity extends Activity
{
private MediaPlayer mp;
private Button play;
private Button pause;
private Button speed;
private Button stop;
private SeekBar seekbar;

private Handler myHandler;

&＃64;SuppressLint("HandlerLeak")
&＃64;Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_music);

initMusic();
initPlayerControl();
initHandler();

new Timer().schedule(new TimerTask()
{
&＃64;Override
public void run()
{
if(mp &＃61;&＃61; null)
return;
if(mp.isPlaying()&&!seekbar.isPressed())
{
Message msg &＃61; new Message();
msg.what &＃61; 0x123;
myHandler.sendMessage(msg);
}
}
}, 0,1000);
}

//初始化Handle
private void initHandler()
{
myHandler &＃61; new Handler()
{
&＃64;Override
public void handleMessage(Message msg)
{
if(msg.what &＃61;&＃61; 0x123)
{
int position &＃61; mp.getCurrentPosition();
seekbar.setProgress(position );
}
}

};
}
//初始化mp&＃xff0c;加载音乐
private void initMusic()
{
mp &＃61; MediaPlayer.create(this, R.raw.xxx);
mp.setLooping(false);
}
//初始化播放器控件
private void initPlayerControl()
{
play &＃61; (Button)findViewById(R.id.play);
pause &＃61; (Button)findViewById(R.id.pause);
speed &＃61; (Button)findViewById(R.id.speed);
stop &＃61; (Button)findViewById(R.id.stop);
seekbar &＃61; (SeekBar)findViewById(R.id.my_seekbar);

play.setEnabled(true);
pause.setEnabled(false);
speed.setEnabled(false);
stop.setEnabled(false);
initSeekBar();

play.setOnClickListener(new OnClickListener()
{
&＃64;Override
public void onClick(View v)
{
if(mp!&＃61;null)
{
mp.start();
play.setEnabled(false);
pause.setEnabled(true);
speed.setEnabled(true);
stop.setEnabled(true);
}
}
});

pause.setOnClickListener(new OnClickListener()
{
&＃64;Override
public void onClick(View v)
{
if(mp!&＃61;null)
{
mp.pause();
play.setEnabled(true);
pause.setEnabled(false);
speed.setEnabled(false);
stop.setEnabled(false);
}
}
});

speed.setOnClickListener(new OnClickListener()
{
&＃64;Override
public void onClick(View v)
{
if(mp!&＃61;null)
{
int positon &＃61; mp.getCurrentPosition();
int duration &＃61; mp.getDuration();
int headon &＃61; duration/20;
mp.seekTo(positon&＃43;headon);
}
}
});

stop.setOnClickListener(new OnClickListener()
{
&＃64;Override
public void onClick(View v)
{
if(mp!&＃61;null)
{
mp.stop();
play.setEnabled(true);
pause.setEnabled(false);
speed.setEnabled(false);
stop.setEnabled(false);
try
{
mp.prepare();
mp.seekTo(0);
seekbar.setProgress(0);
}
catch (IllegalStateException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
});
}

//初始化seekbar拖拽效果
private void initSeekBar()
{
seekbar.setMax(mp.getDuration());
// seekbar.setOnSeekBarChangeListener(new OnSeekBarChangeListener()
// {
// &＃64;Override
// public void onStopTrackingTouch(SeekBar seekBar)
// {
// }
//
// &＃64;Override
// public void onStartTrackingTouch(SeekBar seekBar)
// {
// }
//
// &＃64;Override
// public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser)
// {
// if(mp &＃61;&＃61; null)
// return;
// mp.seekTo(progress);
// }
// });
}
&＃64;Override
protected void onDestroy()
{
if(mp !&＃61;null)
mp.release();
}


}

<LinearLayout xmlns:android&＃61;"http://schemas.android.com/apk/res/android"
xmlns:tools&＃61;"http://schemas.android.com/tools"
android:layout_width&＃61;"match_parent"
android:layout_height&＃61;"match_parent"
android:orientation&＃61;"vertical" >
<LinearLayout
android:layout_width&＃61;"match_parent"
android:layout_height&＃61;"wrap_content"
android:orientation&＃61;"horizontal" >
<Button
android:id&＃61;"&＃64;&＃43;id/play"
android:layout_width&＃61;"wrap_content"
android:layout_height&＃61;"wrap_content"
android:layout_weight&＃61;"1"
android:text&＃61;"play" />
<Button
android:id&＃61;"&＃64;&＃43;id/pause"
android:layout_width&＃61;"wrap_content"
android:layout_height&＃61;"wrap_content"
android:layout_weight&＃61;"1"
android:text&＃61;"pause" />
<Button
android:id&＃61;"&＃64;&＃43;id/speed"
android:layout_width&＃61;"wrap_content"
android:layout_height&＃61;"wrap_content"
android:layout_weight&＃61;"1"
android:text&＃61;"speed" />
<Button
android:id&＃61;"&＃64;&＃43;id/stop"
android:layout_width&＃61;"wrap_content"
android:layout_height&＃61;"wrap_content"
android:layout_weight&＃61;"1"
android:text&＃61;"stop" />
LinearLayout>

<SeekBar
android:id&＃61;"&＃64;&＃43;id/my_seekbar"
android:paddingLeft&＃61;"10dp"
android:paddingRight&＃61;"10dp"
android:layout_width&＃61;"match_parent"
android:layout_height&＃61;"wrap_content"
android:max&＃61;"100">
SeekBar>
LinearLayout>