Android实现歌曲播放时歌词同步显示具体思路

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 {

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 blo ck
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<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();
}

@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);
}

@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);
}

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);
}

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;
}

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;
}

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) {
}

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);
}
}
}

public static boolean isBlLrc() {
return blLrc;
}

public float getOffsetY() {
return offsetY;
}

public void setOffsetY(float offsetY) {
this.offsetY = offsetY;
}

public int getSIZEWORD() {
return SIZEWORD;
}

public void setSIZEWORD(int sIZEWORD) {
SIZEWORD = sIZEWORD;
}
}

xml布局文件如下：
代码如下:
<SPAN style="FONT-SIZE: 18px"><STRONG><?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> </STRONG></SPAN>
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