android简易音乐播放器，歌词跟随显示功能

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.parseColor("#483d8b")); paint.setAntiAlias(true); paint.setDither(true); paint.setAlpha(180); paintHL=new Paint(); paintHL.setTextAlign(Paint.Align.CENTER); paintHL.setColor(Color.GREEN); 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=18; } 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()){