Android -- [SelfView] 自定义多行歌词滚动显示器

Android – [SelfView] 自定义多行歌词滚动显示器

流畅、丝滑的滚动歌词控件* 1. 背景透明；* 2. 外部可控制进度变化；* 3. 支持屏幕拖动调节进度（回调给外部）；

效果
在这里插入图片描述

歌词文件（.lrc）
在这里插入图片描述

一. 使用

<com.nepalese.harinetest.player.lrc.VirgoLrcViewandroid:id="@+id/lrcView"android:layout_width="match_parent"android:layout_height="match_parent"/>

private VirgoLrcView lrcView;lrcView = findViewById(R.id.lrcView);
initLrc();//==================================
private void initLrc(){
//设置歌词文件 .lrc
//lrcView.setLrc(FileUtils.readTxtResource(getApplicationContext(), R.raw.shaonian, "utf-8"));lrcView.setLrc(R.raw.shaonian);lrcView.seekTo(0);lrcView.setCallback(new VirgoLrcView.LrcCallback() {@Overridepublic void onUpdateTime(long time) {//拖动歌词返回的时间点}@Overridepublic void onFinish() {stopTask();}});
}public void onStartPlay(View view) {startTask();
}public void onStopPlay(View view) {stopTask();
}//使用计时器模拟歌曲播放时进度刷新
private long curTime = 0;
private final Runnable timeTisk = new Runnable() {@Overridepublic void run() {curTime += INTERVAL_FLASH;lrcView.seekTo(curTime);}
};private void startTask() {stopTask();handler.post(timeTisk);
}private void stopTask() {handler.removeCallbacks(timeTisk);
}private final long INTERVAL_FLASH = 400L;
private final Handler handler = new Handler(Looper.myLooper()) {@Overridepublic void handleMessage(@NonNull Message msg) {super.handleMessage(msg);}
};

二. 码源

attr.xml

<declare-styleable name="VirgoLrcView"><attr name="vlTextColorM" format="color|reference" /><attr name="vlTextColorS" format="color|reference" /><attr name="vlTextSize" format="dimension|reference" /><attr name="vlLineSpace" format="dimension|reference" />
</declare-styleable>

VirgoLrcView.java

import android.animation.Animator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.LinearInterpolator;import androidx.annotation.Nullable;
import androidx.annotation.RawRes;import com.nepalese.harinetest.R;
import com.nepalese.harinetest.utils.CommonUtil;import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;/*** Created by Administrator on 2024/11/26.* Usage:更流畅、丝滑的滚动歌词控件* 1. 背景透明；* 2. 外部可控制进度变化；* 3. 支持屏幕拖动调节进度（回调给外部）；*/public class VirgoLrcView extends View {private static final String TAG = "VirgoLrcView";private static final float PADD_VALUE = 25f;//时间线两边缩进值private static final float TEXT_RATE = 1.25f;//当前行字体放大比例private static final long INTERVAL_ANIMATION = 400L;//动画时长private static final String DEFAULT_TEXT = "暂无歌词，快去下载吧！";private final Context context;private Paint paint;//画笔, 仅一个private ValueAnimator animator;//动画private List<LrcBean> lineList;//歌词行private LrcCallback callback;//手动滑动进度刷新回调//可设置变量private int textColorMain;//选中字体颜色private int textColorSec;//其他字体颜色private float textSize;//字体大小private float lineSpace;//行间距private float selectTextSize;//当前选中行字体大小private int width, height;//控件宽高private int curLine;//当前行数private int locateLine;//滑动时居中行数private int underRows;//中分下需显示行数private float itemHeight;//一行字+行间距private float centerY;//居中yprivate float startY;//首行yprivate float oldY;//划屏时起始按压点yprivate float offsetY;//动画已偏移量private float offsetY2;//每次手动滑动偏移量private long maxTime;//歌词显示最大时间private boolean isDown;//按压界面private boolean isReverse;//往回滚动？public VirgoLrcView(Context context) {this(context, null);}public VirgoLrcView(Context context, @Nullable AttributeSet attrs) {this(context, attrs, 0);}public VirgoLrcView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);this.context = context;init(attrs);}private void init(AttributeSet attrs) {TypedArray ta = getContext().obtainStyledAttributes(attrs, R.styleable.VirgoLrcView);textColorMain = ta.getColor(R.styleable.VirgoLrcView_vlTextColorM, Color.CYAN);textColorSec = ta.getColor(R.styleable.VirgoLrcView_vlTextColorS, Color.GRAY);textSize = ta.getDimension(R.styleable.VirgoLrcView_vlTextSize, 45f);lineSpace = ta.getDimension(R.styleable.VirgoLrcView_vlLineSpace, 28f);ta.recycle();selectTextSize = textSize * TEXT_RATE;curLine = 0;maxTime = 0;isDown = false;isReverse = false;lineList = new ArrayList<>();paint = new Paint();paint.setTextSize(textSize);paint.setAntiAlias(true);calculateItem();}@Overrideprotected void onLayout(boolean changed, int left, int top, int right, int bottom) {super.onLayout(changed, left, top, right, bottom);if (width == 0 || height == 0) {initLayout();}}//控件大小变化时需重置计算private void initLayout() {width = getWidth();height = getHeight();centerY = (height - itemHeight) / 2.0f;startY = centerY;underRows = (int) Math.ceil(height / itemHeight / 3);Log.d(TAG, "itemHeight: " + itemHeight + ", underRows: " + underRows);}@Overrideprotected void onDraw(Canvas canvas) {//提示无歌词if (lineList.isEmpty()) {paint.setColor(textColorMain);paint.setTextSize(selectTextSize);canvas.drawText(DEFAULT_TEXT, getStartX(DEFAULT_TEXT, paint), centerY, paint);return;}if (isDown) {paint.setTextSize(textSize);paint.setColor(textColorSec);//画时间if (locateLine >= 0) {canvas.drawText(lineList.get(locateLine).getStrTime(), PADD_VALUE, centerY, paint);}//画选择线canvas.drawLine(PADD_VALUE, centerY, width - PADD_VALUE, centerY, paint);//手动滑动drawTexts(canvas, startY - offsetY2);} else {//自动滚动if (isReverse) {drawTexts(canvas, startY + offsetY);} else {drawTexts(canvas, startY - offsetY);}}}private void drawTexts(Canvas canvas, float tempY) {for (int i = 0; i < lineList.size(); i++) {float y = tempY + i * itemHeight;if (y < 0 || y > height) {continue;}if (curLine == i) {paint.setTextSize(selectTextSize);paint.setColor(textColorMain);} else {paint.setTextSize(textSize);paint.setColor(textColorSec);}canvas.drawText(lineList.get(i).getLrc(), getStartX(lineList.get(i).getLrc(), paint), y, paint);}}@Overridepublic boolean onTouchEvent(MotionEvent event) {super.onTouchEvent(event);switch (event.getAction()) {case MotionEvent.ACTION_DOWN:isDown = true;if (animator != null) {if (animator.isRunning()) {//停止动画animator.end();}}locateLine = -1;oldY = event.getY();break;case MotionEvent.ACTION_MOVE:offsetY2 = oldY - event.getY();calculateCurLine(oldY - event.getY());//定位时间啊invalidate();break;case MotionEvent.ACTION_UP:isDown = false;postNewLine();break;}return true;}//计算滑动后当前居中的行private void calculateCurLine(float y) {int offLine = (int) Math.floor(y / itemHeight);if (offLine == 0) {return;}locateLine = curLine + offLine;if (locateLine > lineList.size() - 1) {//最后一行locateLine = lineList.size() - 1;} else if (locateLine < 0) {//第一行locateLine = 0;}}//回调通知，自身不跳转进度private void postNewLine() {//返回当前行对应的时间线if (callback == null) {return;}if (locateLine >= 0) {callback.onUpdateTime(lineList.get(locateLine).getTime());}}@Overrideprotected void onDetachedFromWindow() {releaseBase();super.onDetachedFromWindow();}/*** 移除控件，注销资源*/private void releaseBase() {cancelAnim();if (lineList != null) {lineList.clear();lineList = null;}if (callback != null) {callback = null;}}private void calculateItem() {itemHeight = getTextHeight() + lineSpace;}//计算使文字水平居中private float getStartX(String str, Paint paint) {return (width - paint.measureText(str)) / 2.0f;}//获取文字高度private float getTextHeight() {Paint.FontMetrics fm = paint.getFontMetrics();return fm.descent - fm.ascent;}//解析歌词private void parseLrc(InputStreamReader inputStreamReader) {BufferedReader reader = new BufferedReader(inputStreamReader);String line;try {while ((line = reader.readLine()) != null) {parseLine(line);}} catch (IOException e) {e.printStackTrace();}try {inputStreamReader.close();} catch (IOException e) {e.printStackTrace();}try {reader.close();} catch (IOException e) {e.printStackTrace();}maxTime = lineList.get(lineList.size() - 1).getTime() + 1000;//多加一秒}private long parseTime(String time) {// 00:01.10String[] min = time.split(":");String[] sec = min[1].split("\\.");long minInt = Long.parseLong(min[0].replaceAll("\\D+", "").replaceAll("\r", "").replaceAll("\n", "").trim());long secInt = Long.parseLong(sec[0].replaceAll("\\D+", "").replaceAll("\r", "").replaceAll("\n", "").trim());long milInt = Long.parseLong(sec[1].replaceAll("\\D+", "").replaceAll("\r", "").replaceAll("\n", "").trim());return minInt * 60 * 1000 + secInt * 1000 + milInt;// * 10;}private void parseLine(String line) {Matcher matcher = Pattern.compile("\\[\\d.+].+").matcher(line);// 如果形如：[xxx]后面啥也没有的，则return空if (!matcher.matches()) {long time;String str;String con = line.replace("\\[", "").replace("\\]", "");if (con.matches("^\\d.+")) {//timetime = parseTime(con);str = " ";} else {return;}lineList.add(new LrcBean(time, str, con));return;}//[00:23.24]让自己变得快乐line = line.replaceAll("\\[", "");String[] result = line.split("]");lineList.add(new LrcBean(parseTime(result[0]), result[1], result[0]));}private void reset() {lineList.clear();curLine = 0;maxTime = 0;isReverse = false;cancelAnim();}///动画//*** 更新动画** @param lineNum 需跳转行数*/private void updateAnim(int lineNum) {if (lineNum == 0) {return;} else if (lineNum == 1) {//自然变化if (curLine >= lineList.size() - underRows) {//停止动画 仅变更颜色cancelAnim();invalidate();return;}}isReverse = lineNum < 0;cancelAnim();setAnimator(Math.abs(lineNum));doAnimation();}/*** 注销已有动画*/protected void cancelAnim() {if (animator != null) {animator.removeAllListeners();animator.end();animator = null;}}/*** 动态创建动画** @param lineNum 需跳转行数*/private void setAnimator(int lineNum) {animator = ValueAnimator.ofFloat(0, itemHeight * lineNum);//一行animator.setDuration(INTERVAL_ANIMATION);animator.setInterpolator(new LinearInterpolator());//插值器设为线性}/*** 监听动画*/private void doAnimation() {if (animator == null) {return;}animator.addListener(new Animator.AnimatorListener() {@Overridepublic void onAnimationStart(Animator animation) {offsetY = 0;}@Overridepublic void onAnimationEnd(Animator animation) {if (isReverse) {startY += offsetY;} else {startY -= offsetY;}offsetY = 0;invalidate();}@Overridepublic void onAnimationCancel(Animator animation) {}@Overridepublic void onAnimationRepeat(Animator animation) {}});animator.addUpdateListener(animation -> {float av = (float) animation.getAnimatedValue();if (av == 0) {return;}offsetY = av;invalidate();});animator.start();}public interface LrcCallback {void onUpdateTime(long time);void onFinish();}/*** 滑动监听** @param callback LrcCallback*/public void setCallback(LrcCallback callback) {this.callback = callback;}public void setTextColorMain(int textColorMain) {this.textColorMain = textColorMain;}public void setTextColorSec(int textColorSec) {this.textColorSec = textColorSec;}public void setTextSize(float textSize) {this.textSize = textSize;this.selectTextSize = textSize * TEXT_RATE;paint.setTextSize(textSize);calculateItem();}public void setLineSpace(float lineSpace) {this.lineSpace = lineSpace;calculateItem();}/*** 设置歌词** @param lrc 解析后的string*/public void setLrc(String lrc) {if (TextUtils.isEmpty(lrc)) {return;}reset();parseLrc(new InputStreamReader(new ByteArrayInputStream(lrc.getBytes())));}/*** 设置歌词** @param resId 资源文件id*/public void setLrc(@RawRes int resId) {reset();parseLrc(new InputStreamReader(context.getResources().openRawResource(resId), StandardCharsets.UTF_8));}/*** 设置歌词** @param path lrc文件路径*/public void setLrcFile(String path) {File file = new File(path);if (file.exists()) {reset();String format;if (CommonUtil.isUtf8(file)) {format = "UTF-8";} else {format = "GBK";}FileInputStream inputStream = null;try {inputStream = new FileInputStream(file);} catch (FileNotFoundException e) {e.printStackTrace();}InputStreamReader inputStreamReader = null;//'utf-8' 'GBK'try {inputStreamReader = new InputStreamReader(inputStream, format);} catch (UnsupportedEncodingException e) {e.printStackTrace();}parseLrc(inputStreamReader);}}/*** 调整播放位置** @param time ms*/public void seekTo(long time) {if (isDown) {//拖动歌词时暂不处理return;}if (time == 0) {//刷新invalidate();return;} else if (time > maxTime) {//超最大时间：通知结束if (callback != null) {callback.onFinish();}return;}for (int i = 0; i < lineList.size(); i++) {if (i < lineList.size() - 1) {if (time >= lineList.get(i).getTime() && time < lineList.get(i + 1).getTime()) {int temp = i - curLine;curLine = i;updateAnim(temp);break;}} else {//last lineint temp = i - curLine;curLine = i;updateAnim(temp);break;}}}
}