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：

代码如下:

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：

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

}

};

}

歌词View的代码如下：

代码如下:

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.Iterator;

import java.util.TreeMap;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.util.AttributeSet;

import android.util.Log;

import android.view.MotionEvent;

import android.view.View;

public class LyricView extends View{

private static TreeMap lrc_map;

private float mX; //屏幕X轴的中点，此值固定，保持歌词在X中间显示

private float offsetY; //歌词在Y轴上的偏移量，此值会根据歌词的滚动变小

private static boolean blLrc=false;

private float touchY; //当触摸歌词View时，保存为当前触点的Y轴坐标

private float touchX;

private boolean blScrollView=false;

private int lrcIndex=0; //保存歌词TreeMap的下标

private int SIZEWORD=0;//显示歌词文字的大小值

private int INTERVAL=45;//歌词每行的间隔

Paint paint=new Paint();//画笔，用于画不是高亮的歌词

Paint paintHL=new Paint(); //画笔，用于画高亮的歌词，即当前唱到这句歌词

public LyricView(Context context){

super(context);

init();

}

public LyricView(Context context, AttributeSet attrs) {

super(context, attrs);

init();

}

/* (non-Javadoc)

* @see android.view.View#onDraw(android.graphics.Canvas)

*/

@Override

protected void onDraw(Canvas canvas) {

if(blLrc){

paintHL.setTextSize(SIZEWORD);

paint.setTextSize(SIZEWORD);

LyricObject temp=lrc_map.get(lrcIndex);

canvas.drawText(temp.lrc, mX, offsetY+(SIZEWORD+INTERVAL)*lrcIndex, paintHL);

// 画当前歌词之前的歌词

for(int i=lrcIndex-1;i>=0;i--){

temp=lrc_map.get(i);

if(offsetY+(SIZEWORD+INTERVAL)*i