Android实现歌曲播放时歌词同步显示

我们需要读取以上歌词文件的每一行转换成成一个个歌词实体：

public class LyricObject {   

    public int begintime; // 开始时间
    public int endtime; // 结束时间
    public int timeline; // 单句歌词用时
    public String lrc; // 单句歌词
}

可根据当前播放器的播放进度与每句歌词的开始时间，得到当前屏幕中央高亮显示的那句歌词。在 UI线程中另起线程，通过回调函数 onDraw() 每隔100ms重新绘制屏幕，实现歌词平滑滚动的动画效果。 MainActivity代码如下：

import java.io.IOException;
import android.app.Activity;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;    

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    private LyricView lyricView;
    private MediaPlayer mediaPlayer;
    private Button button;
    private SeekBar seekBar;
    private String mp3Path;
    private int INTERVAL=45;//歌词每行的间隔    

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        // getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.main);    

        mp3Path = Environment.getExternalStorageDirectory().getAbsolutePath() + 

"/LyricSync/1.mp3";    

        lyricView = (LyricView) findViewById(R.id.mylrc);
        mediaPlayer = new MediaPlayer();
        // this.requestWindowFeature(Window.FEATURE_NO_TITLE);    

        ResetMusic(mp3Path);
        SerchLrc();
        lyricView.SetTextSize();    

        button = (Button) findViewById(R.id.button);
        button.setText("播放");    

        seekBar = (SeekBar) findViewById(R.id.seekbarmusic);
        seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {    

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub    

            }    

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub    

            }    

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {
                // TODO Auto-generated method stub
                if (fromUser) {
                    mediaPlayer.seekTo(progress);
                    lyricView.setOffsetY(220 - lyricView.SelectIndex(progress)
                            * (lyricView.getSIZEWORD() + INTERVAL-1));    

                }
            }
        });    

        button.setOnClickListener(new OnClickListener() {    

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if (mediaPlayer.isPlaying()) {
                    button.setText("播放");
                    mediaPlayer.pause();
                } else {
                    button.setText("暂停");
                    mediaPlayer.start();
                    lyricView.setOffsetY(220 - lyricView.SelectIndex(mediaPlayer.getCurrentPosition())
                            * (lyricView.getSIZEWORD() + INTERVAL-1));    

                }
            }
        });    

        mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                ResetMusic(mp3Path);
                lyricView.SetTextSize();
                lyricView.setOffsetY(200);
                mediaPlayer.start();
            }
        });
        seekBar.setMax(mediaPlayer.getDuration());
        new Thread(new runable()).start();
    }    

    public void SerchLrc() {
        String lrc = mp3Path;
        lrc = lrc.substring(0, lrc.length() - 4).trim() + ".lrc".trim();
        LyricView.read(lrc);
        lyricView.SetTextSize();
        lyricView.setOffsetY(350);
    }    

    public void ResetMusic(String path) {    

        mediaPlayer.reset();
        try {    

            mediaPlayer.setDataSource(mp3Path);
            mediaPlayer.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();
        }
    }    

    class runable implements Runnable {    

        @Override
        public void run() {
            // TODO Auto-generated method stub
            while (true) {    

                try {
                    Thread.sleep(100);
                    if (mediaPlayer.isPlaying()) {
                        lyricView.setOffsetY(lyricView.getOffsetY() - lyricView.SpeedLrc());
                        lyricView.SelectIndex(mediaPlayer.getCurrentPosition());
                        seekBar.setProgress(mediaPlayer.getCurrentPosition());
                        mHandler.post(mUpdateResults);
                    }
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }    

    Handler mHandler = new Handler();
    Runnable mUpdateResults = new Runnable() {
        public void run() {
            lyricView.invalidate(); // 更新视图
        }
    };
}

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