Android实现歌词滑动显示

继承TextView自定义LyricView

import java.util.List;  
  
import com.anjoyo.musicplayer.bean.LyricBean;  
  
import android.content.Context;  
import android.graphics.Canvas;  
import android.graphics.Color;  
import android.graphics.LinearGradient;  
import android.graphics.Paint;  
import android.graphics.Shader;  
import android.graphics.Typeface;  
import android.graphics.Paint.Align;  
import android.graphics.Shader.TileMode;  
import android.util.AttributeSet;  
import android.widget.TextView;  
  
public class LyricView extends TextView {  
  
    /** 控件的高 */  
    private float mHeight;  
    /** 控件的宽 */  
    private float mWidth;  
    private Paint mPaint;  
    private Paint prePaint;  
    private Paint nextPaint;  
      
    /** 当前歌曲的歌词 */  
    private List<LyricBean> lyricBeanList;  
    /** 歌词进度，List中的位置 */  
    private int index;  
      
    private float heightSign;  
    private boolean start;  
      
    private Shader inShader = new LinearGradient(0, 0, 0, LYRIC_ONE_HEIGHT,   
            Color.argb(0xcc, 0xcc, 0xcc, 0xcc),   
            Color.argb(0xff, 0xff, 0xff, 0xff), TileMode.MIRROR);  
    private Shader outShader = new LinearGradient(0, LYRIC_ONE_HEIGHT, 0, 0,   
            Color.argb(0xcc, 0xcc, 0xcc, 0xcc),   
            Color.argb(0xff, 0xff, 0xff, 0xff), TileMode.MIRROR);  
      
    /** 歌词显示的字体大小 */  
    private static final int LYRIC_TEXT_SIZE = 36;  
    /** 每行歌词的高度 */  
    private static final int LYRIC_ONE_HEIGHT = 60;  
      
    public LyricView(Context context) {  
        super(context);  
        initView();  
    }  
  
    public LyricView(Context context, AttributeSet attrs, int defStyle) {  
        super(context, attrs, defStyle);  
        initView();  
    }  
  
    public LyricView(Context context, AttributeSet attrs) {  
        super(context, attrs);  
        initView();  
          
        new UpdateThread().start();  
    }  
      
    private void initView() {  
        setFocusable(true);  
           
        mPaint = new Paint();  
        mPaint.setAntiAlias(true);// 设置画笔的锯齿效果  
        mPaint.setTextAlign(Align.CENTER);  
        mPaint.setTextSize(LYRIC_TEXT_SIZE);  
        mPaint.setTypeface(Typeface.SERIF);  
          
        prePaint = new Paint(mPaint);  
        prePaint.setShader(outShader);  
        nextPaint = new Paint(mPaint);  
        nextPaint.setShader(inShader);  
    }  
      
    @Override  
    protected void onDraw(Canvas canvas) {  
        super.onDraw(canvas);  
        if (canvas == null) {  
            return;  
        }  
        mPaint.setColor(Color.argb(0xff, 0xff, 0xff, 0xff));//当前歌词词句颜色  
        if (lyricBeanList == null || lyricBeanList.size() < 1 || index > lyricBeanList.size() - 1) {  
            canvas.drawText("好音质，MusicPlayer！", mWidth / 2, mHeight / 2, mPaint);  
            return;  
        }  
        canvas.drawText(lyricBeanList.get(index).getLyric(), mWidth / 2, heightSign, mPaint);  
          
        mPaint.setColor(Color.argb(0xcc, 0xcc, 0xcc, 0xcc));//非当前歌词词句颜色  
          
        float currentY = heightSign;  
        //画出本句之前的歌词  
        for (int i = index - 1; i >= 0; i--) {  
            currentY -= LYRIC_ONE_HEIGHT;  
            if (i == index - 1) {  
                canvas.drawText(lyricBeanList.get(i).getLyric(), mWidth / 2,  
                        currentY, prePaint);  
            } else {  
                canvas.drawText(lyricBeanList.get(i).getLyric(), mWidth / 2,  
                        currentY, mPaint);  
            }  
        }  
        currentY = heightSign;  
        //画出本句之后的歌词  
        for (int i = index + 1; i < lyricBeanList.size(); i++) {  
            currentY += LYRIC_ONE_HEIGHT;  
            if (i == index + 1) {  
                canvas.drawText(lyricBeanList.get(i).getLyric(), mWidth / 2,  
                        currentY, nextPaint);     
            } else {  
                canvas.drawText(lyricBeanList.get(i).getLyric(), mWidth / 2,  
                        currentY, mPaint);        
            }  
        }  
    }  
      
    public void setLyricList(List<LyricBean> lyricBeanList) {  
        this.lyricBeanList = lyricBeanList;  
    }  
      
    public void setStart(boolean start) {  
        this.start = start;  
    }  
      
    public boolean getStart() {  
        return this.start;  
    }  
      
    public void setIndex(int index) {  
        if (this.index != index) {  
            this.index = index;  
            heightSign = mHeight / 2 + LYRIC_ONE_HEIGHT / 2;  
        }  
    }  
      
    private class UpdateThread extends Thread {  
        @Override  
        public void run() {  
            while (true) {  
                if (start && lyricBeanList.size() > index + 1) {  
                    if (heightSign > mHeight / 2f - LYRIC_ONE_HEIGHT / 2f) {  
                        heightSign -= LYRIC_ONE_HEIGHT /   
                                (float)(lyricBeanList.get(index + 1).getLyricTime()   
                                        - lyricBeanList.get(index).getLyricTime()) * 50;  
                    }  
                    postInvalidate();  
                }  
                try {  
                    sleep(50);  
                } catch (InterruptedException e) {  
                    e.printStackTrace();  
                }  
            }  
        }  
    }  
      
    @Override  
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {  
        super.onSizeChanged(w, h, oldw, oldh);  
        mWidth = w;  
        mHeight = h;  
        heightSign = h / 2f + LYRIC_ONE_HEIGHT / 2f;  
    }  
  
      
}

LyricBean.java如下

import java.util.List;  
  
/** 
 * 一句歌词 
 *  
 * @author HLP 
 */  
public class LyricBean {  
  
    /** 一句歌词 */  
    private String lyric;  
    /** 本句歌词开始的时间 */  
    private int lyricTime;  
    /** 本句歌词每个字的持续时间 ，构成数组 */  
    private List<Integer> wordsTime;  
  
    public LyricBean(String lyric, int lyricTime, List<Integer> wordsTime) {  
        super();  
        this.lyric = lyric;  
        this.lyricTime = lyricTime;  
        this.wordsTime = wordsTime;  
    }  
  
    public String getLyric() {  
        return lyric;  
    }  
  
    public void setLyric(String lyric) {  
        this.lyric = lyric;  
    }  
  
    public int getLyricTime() {  
        return lyricTime;  
    }  
  
    public void setLyricTime(int lyricTime) {  
        this.lyricTime = lyricTime;  
    }  
  
    public List<Integer> getWordsTime() {  
        return wordsTime;  
    }  
  
    public void setWordsTime(List<Integer> wordsTime) {  
        this.wordsTime = wordsTime;  
    }  
  
}

有个模拟【天天动听】的项目在GitHub上，需要手机中有MP3歌曲和天天动听格式的歌词，
歌曲和歌词文件名一致，查看请点击