Android 歌词同步滚动效果(转)

歌词是播放器类App必不可少的组件，而一般的歌词组件都需要做到歌词的显示与播放进度同步。我们知道，歌词是如下所示的文件：

lrc 

[ti:原来爱情这么伤]
[ar:梁咏琪]
[al:给自己的情歌]


[00:00.55]梁咏琪 - 原来爱情这么伤
[00:05.43]作词:彭学斌
[00:06.68]作曲:彭学斌
[00:09.63]
[00:22.27]我睁开眼睛 却感觉不到天亮
[00:29.74]东西吃一半 莫名其妙哭一场
[00:37.06]我忍住不想 时间变得更漫长
[00:44.09]也与你有关 否则又开始胡思乱想
[00:53.81]我日月无光 忙得不知所以然
[00:59.96]找朋友交谈 其实全帮不上忙
[01:07.49]以为会习惯 有你在才是习惯
[01:14.62]你曾住在我心上 现在空了一个地方
[01:21.89]原来爱情这么伤 比想象中还难
[01:29.90]泪水总是不听话 幸福躲起来不声不响
[01:37.43]太多道理太牵强 道理全是一样
[01:44.34]说的时候很简单 爱上后却正巧打乱
[02:00.00]我日月无光 忙得不知所以然
[02:07.41]找朋友交谈 其实全帮不上忙
[02:15.07]以为会习惯 有你在才是习惯
[02:21.88]你曾住在我心上 现在空了一个地方
[02:29.38]原来爱情这么伤 比想象中还难
[02:36.60]泪水总是不听话 幸福躲起来不声不响
[02:44.22]太多道理太牵强 道理全是一样
[02:50.78]说的时候很简单 爱上后却正巧打乱
[03:00.32]只想变的坚强 强到能够去忘
[03:07.29]无所谓悲伤 只要学会抵抗
[03:14.19]原来爱情这么伤
[03:20.78]原来爱情是这样 这样峰回路转
[03:28.12]泪水明明流不干 瞎了眼还要再爱一趟
[03:35.83]有一天终于打完 思念的一场战
[03:43.45]回过头再看一看 原来爱情那么伤
[03:54.76]下次还会不会这样
[88:88.88]

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：

package com.music.lyricsync;

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：

package com.music.lyricsync;

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：

package com.music.lyricsync;

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<Integer, LyricObject> 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<0){
                    break;
                }
                canvas.drawText(temp.lrc, mX, offsetY+(SIZEWORD+INTERVAL)*i, paint);
            }
            // 画当前歌词之后的歌词
            for(int i=lrcIndex+1;i<lrc_map.size();i++){
                temp=lrc_map.get(i);
                if(offsetY+(SIZEWORD+INTERVAL)*i>600){
                    break;
                }
                canvas.drawText(temp.lrc, mX, offsetY+(SIZEWORD+INTERVAL)*i, paint);
            }
        }
        else{
            paint.setTextSize(25);
            canvas.drawText("找不到歌词", mX, 310, paint);
        }
        super.onDraw(canvas);
    }

    /* (non-Javadoc)
     * @see android.view.View#onTouchEvent(android.view.MotionEvent)
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        System.out.println("bllll==="+blScrollView);
        float tt=event.getY();
        if(!blLrc){
            //return super.onTouchEvent(event);

            return super.onTouchEvent(event);
        }
        switch(event.getAction()){
        case MotionEvent.ACTION_DOWN:
            touchX=event.getX();
            break;
        case MotionEvent.ACTION_MOVE:
            touchY=tt-touchY;
            offsetY=offsetY+touchY;
            break;
        case MotionEvent.ACTION_UP:
            blScrollView=false;
            break;
        }
        touchY=tt;
        return true;
    }

    public void init(){
        lrc_map = new TreeMap<Integer, LyricObject>();
        offsetY=320;

        paint=new Paint();
        paint.setTextAlign(Paint.Align.CENTER);
        paint.setColor(Color.GREEN);
        paint.setAntiAlias(true);
        paint.setDither(true);
        paint.setAlpha(180);


        paintHL=new Paint();
        paintHL.setTextAlign(Paint.Align.CENTER);

        paintHL.setColor(Color.RED);
        paintHL.setAntiAlias(true);
        paintHL.setAlpha(255);
    }

    /**
     * 根据歌词里面最长的那句来确定歌词字体的大小
     */

    public void SetTextSize(){
        if(!blLrc){
            return;
        }
        int max=lrc_map.get(0).lrc.length();
        for(int i=1;i<lrc_map.size();i++){
            LyricObject lrcStrLength=lrc_map.get(i);
            if(max<lrcStrLength.lrc.length()){
                max=lrcStrLength.lrc.length();
            }
        }
        SIZEWORD=320/max;

    }

    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        mX = w * 0.5f;
        super.onSizeChanged(w, h, oldw, oldh);
    }

    /**
     *  歌词滚动的速度
     *
     * @return 返回歌词滚动的速度
     */
    public Float SpeedLrc(){
        float speed=0;
        if(offsetY+(SIZEWORD+INTERVAL)*lrcIndex>220){
            speed=((offsetY+(SIZEWORD+INTERVAL)*lrcIndex-220)/20);

        } else if(offsetY+(SIZEWORD+INTERVAL)*lrcIndex < 120){
            Log.i("speed", "speed is too fast!!!");
            speed = 0;
        }
//      if(speed<0.2){
//          speed=0.2f;
//      }
        return speed;
    }

    /**
     * 按当前的歌曲的播放时间，从歌词里面获得那一句
     * @param time 当前歌曲的播放时间
     * @return 返回当前歌词的索引值
     */
    public int SelectIndex(int time){
        if(!blLrc){
            return 0;
        }
        int index=0;
        for(int i=0;i<lrc_map.size();i++){
            LyricObject temp=lrc_map.get(i);
            if(temp.begintime<time){
                ++index;
            }
        }
        lrcIndex=index-1;
        if(lrcIndex<0){
            lrcIndex=0;
        }
        return lrcIndex;

    }

    /**
     * 读取歌词文件
     * @param file 歌词的路径
     *
     */
    public static void read(String file) {
        TreeMap<Integer, LyricObject> lrc_read =new TreeMap<Integer, LyricObject>();
        String data = "";
        try {
          File saveFile=new File(file);
         // System.out.println("是否有歌词文件"+saveFile.isFile());
          if(!saveFile.isFile()){
              blLrc=false;
              return;
          }
          blLrc=true;

          //System.out.println("bllrc==="+blLrc);
          FileInputStream stream = new FileInputStream(saveFile);//  context.openFileInput(file);


          BufferedReader br = new BufferedReader(new InputStreamReader(stream,"GB2312"));
          int i = 0;
          Pattern pattern = Pattern.compile("\d{2}");
          while ((data = br.readLine()) != null) {
             // System.out.println("++++++++++++>>"+data);
                data = data.replace("[","");//将前面的替换成后面的
                data = data.replace("]","@");
                String splitdata[] =data.split("@");//分隔
                if(data.endsWith("@")){
                    for(int k=0;k<splitdata.length;k++){
                        String str=splitdata[k];

                        str = str.replace(":",".");
                        str = str.replace(".","@");
                        String timedata[] =str.split("@");
                        Matcher matcher = pattern.matcher(timedata[0]);
                        if(timedata.length==3 && matcher.matches()){
                            int m = Integer.parseInt(timedata[0]);  //分
                            int s = Integer.parseInt(timedata[1]);  //秒
                            int ms = Integer.parseInt(timedata[2]); //毫秒
                            int currTime = (m*60+s)*1000+ms*10;
                            LyricObject item1= new LyricObject();
                            item1.begintime = currTime;
                            item1.lrc       = "";
                            lrc_read.put(currTime,item1);
                        }
                    }

                }
                else{
                    String lrcContenet = splitdata[splitdata.length-1];

                    for (int j=0;j<splitdata.length-1;j++)
                    {
                        String tmpstr = splitdata[j];

                        tmpstr = tmpstr.replace(":",".");
                        tmpstr = tmpstr.replace(".","@");
                        String timedata[] =tmpstr.split("@");
                        Matcher matcher = pattern.matcher(timedata[0]);
                        if(timedata.length==3 && matcher.matches()){
                            int m = Integer.parseInt(timedata[0]);  //分
                            int s = Integer.parseInt(timedata[1]);  //秒
                            int ms = Integer.parseInt(timedata[2]); //毫秒
                            int currTime = (m*60+s)*1000+ms*10;
                            LyricObject item1= new LyricObject();
                            item1.begintime = currTime;
                            item1.lrc       = lrcContenet;
                            lrc_read.put(currTime,item1);// 将currTime当标签  item1当数据 插入TreeMap里
                            i++;
                        }
                    }
                }

          }
         stream.close();
        }
        catch (FileNotFoundException e) {
        }
        catch (IOException e) {
        }

        /*
         * 遍历hashmap 计算每句歌词所需要的时间
        */
        lrc_map.clear();
        data ="";
        Iterator<Integer> iterator = lrc_read.keySet().iterator();
        LyricObject oldval  = null;
        int i =0;
        while(iterator.hasNext()) {
            Object ob =iterator.next();

            LyricObject val = (LyricObject)lrc_read.get(ob);

            if (oldval==null)
                oldval = val;
            else
            {
                LyricObject item1= new LyricObject();
                item1  = oldval;
                item1.timeline = val.begintime-oldval.begintime;
                lrc_map.put(new Integer(i), item1);
                i++;
                oldval = val;
            }
            if (!iterator.hasNext()) {
                lrc_map.put(new Integer(i), val);
            }

        }

    }

    /**
     * @return the blLrc
     */
    public static boolean isBlLrc() {
        return blLrc;
    }

    /**
     * @return the offsetY
     */
    public float getOffsetY() {
        return offsetY;
    }

    /**
     * @param offsetY the offsetY to set
     */
    public void setOffsetY(float offsetY) {
        this.offsetY = offsetY;
    }

    /**
     * @return 返回歌词文字的大小
     */
    public int getSIZEWORD() {
        return SIZEWORD;
    }

    /**
     * 设置歌词文字的大小
     * @param sIZEWORD the sIZEWORD to set
     */
    public void setSIZEWORD(int sIZEWORD) {
        SIZEWORD = sIZEWORD;
    }
}

 

xml布局文件如下：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FFFFFF" >

    <com.music.lyricsync.LyricView
        android:id="@+id/mylrc"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginBottom="50dip"
        android:layout_marginTop="50dip" />

    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <SeekBar
            android:id="@+id/seekbarmusic"
            android:layout_width="205px"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginBottom="5px"
            android:progress="0" />
    </LinearLayout>

</RelativeLayout>

 

程序运行后如下图所示：

运行程序前，先在SDCard根目录下新建LyricSync目录，将 歌曲和歌词.zip 中的 1.mp3 和 1.lrc 文件解压放入LyricSync目录下即可。

• 歌曲和歌词.zip (3.9 MB)
• 下载次数: 163

• src.zip (179.2 KB)
• 下载次数: 186

• 查看图片附件