public class AudioPlay extends Activity {
    private MediaPlayer mediaPlayer;
    private Button playButton;
    private int currentPosition;
    private SeekBar seekBar;
    Boolean mWorking;
    private static final String TAG = "MediaActivity";
    String path = "";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.audio_paly);
        seekBar = (SeekBar) findViewById(R.id.playSeekBar);
        playButton = (Button) findViewById(R.id.playButton);
        path = getIntent().getStringExtra("path");
        mediaPlayer = new MediaPlayer();
        playButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mediaPlayer.isPlaying()) {
                    if (mediaPlayer.isPlaying()) {
                        mediaPlayer.stop();
                        clearData();
                    }
                } else {
                    playMusic(path);
                }
            }
        });
        // 监听播放完成
        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                clearData();
            }
        });
        // 监听触摸
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            public void onProgressChanged(SeekBar seekBar, int progress,
                                          boolean fromUser) {
            }

            // 触摸的时候,做好标记,
            public void onStartTrackingTouch(SeekBar seekBar) {
                mWorking = false;
                updateSeekBar();
            }

            // 触摸结束
            public void onStopTrackingTouch(SeekBar seekBar) {
                if(mediaPlayer.isPlaying()){
                    mWorking = true;
                    mediaPlayer.seekTo(seekBar.getProgress());// 通知触摸位置到播放位置
                    updateSeekBar();
                }else {
                    clearData();
                }
            }
        });
    }

    /**
     * 播放音乐
     *
     * @param path 播放文件的路径
     */
    public void playMusic(String path) {
        try {
            mediaPlayer.reset();
            mediaPlayer.setDataSource(path);
            mediaPlayer.setLooping(false);// 循环播放
            mediaPlayer.prepare();
            mediaPlayer.start();
            seekBar.setMax(mediaPlayer.getDuration());
            playButton.setText("播放中");
            updateSeekBar();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 中途停止,或者播放完毕清空相关数据
     */
    public void clearData() {
            // 延迟
            Handler handler=new Handler();
            Runnable runnable=new Runnable() {
                @Override
                public void run() {
                    currentPosition=0;
                    seekBar.setProgress(currentPosition);
                }
            };
            handler.postDelayed(runnable, 300);
            mWorking=false;// 停止计时
            playButton.setText("开始");

    }

    /**
     * 更新SeekBar
     */
    private void updateSeekBar() {
        mWorking = true;
        final int duration = mediaPlayer.getDuration();
        new Thread() {
            @Override
            public void run() {
                while (mWorking) {
                    try {
                        Thread.sleep(50);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    if (mediaPlayer == null) return;
                    int currentPosition = mediaPlayer.getCurrentPosition();
                    //发送数据给ui
                    Message message = Message.obtain();
                    Bundle bundle = new Bundle();
                    bundle.putInt("currentPosition", currentPosition);
                    message.setData(bundle);
                    handler.sendMessage(message);
                }
            }
        }.start();
    }

    public Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            Bundle data = msg.getData();
            //int duration = data.getInt("duration");
            int currentPosition = data.getInt("currentPosition");
            seekBar.setProgress(currentPosition);
        }
    };


    @Override
    protected void onDestroy() {
        mediaPlayer.stop();
        clearData();
        mediaPlayer.release();
        mediaPlayer = null;
        super.onDestroy();
    }
}

// 布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="音乐播放器" />

    <EditText
        android:id="@+id/mediaFileName"
        android:layout_width="match_parent"
        android:text="播放.mp3"
        android:layout_height="wrap_content" >
        <requestFocus />
    </EditText>


    <LinearLayout
        android:id="@+id/linearButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center_vertical"
        >

        <Button
            android:id="@+id/playButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="开始" />
        <SeekBar
            android:id="@+id/playSeekBar"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:maxHeight="2dp"
            android:minHeight="2dp"
            android:paddingBottom="3dp"
            android:paddingLeft="12dp"
            android:max="200"
            android:paddingRight="12dp"
            android:paddingTop="3dp"
            android:progressDrawable="@drawable/layer_progress"
            android:thumb="@drawable/shape_circle" />

    </LinearLayout>
</LinearLayout>

//layer_progress
<?xml version="1.0" encoding="utf-8"?>
<layer-list
    xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background">
        <shape>
            <corners android:radius="3dp" />
            <solid android:color="#ECF0F1" />
        </shape>
    </item>
    <item android:id="@android:id/secondaryProgress">
        <clip>
            <shape>
                <corners android:radius="3dp" />
                <solid android:color="#C6CACE" />
            </shape>
        </clip>
    </item>
    <item android:id="@android:id/progress">
        <clip>
            <shape>
                <corners android:radius="3dp" />
                <solid android:color="#16BC5C" />
            </shape>
        </clip>
    </item>
</layer-list>

//shape_circle
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <!-- solid表示远的填充色 -->
    <solid android:color="#16BC5C" />
    <!-- stroke则代表远的边框线 -->
    <stroke
        android:width="1dp"
        android:color="#16BC5C" />
    <!-- size控制高宽 -->
    <size
        android:height="20dp"
        android:width="20dp" />
</shape>