直播软件开发，Android自定义简单的音频波谱view

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package com.ysalliance.qifan.util.myview.voiceview; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Handler; import android.os.Message; import android.util.AttributeSet; import android.util.Log; import android.view.View; import android.widget.TextView; import androidx.annotation.Nullable; import com.didichuxing.doraemonkit.widget.tableview.utils.DensityUtils; import com.ysalliance.qifan.R; import java.util.ArrayList; import java.util.List; import java.util.Random; public class VoisePlayingIcon extends View { 
    //画笔 private Paint paint; //跳动指针的集合 private List<Pointer> pointers; //跳动指针的数量 private int pointerNum; //逻辑坐标 原点 private float basePointX; private float basePointY; //指针间的间隙 默认5dp private float pointerPadding; //每个指针的宽度 默认3dp private float pointerWidth; //指针的颜色 private int pointerColor = Color.RED; //控制开始/停止 private boolean isPlaying = false; //子线程 private Thread myThread; //指针波动速率 private int pointerSpeed; public VoisePlayingIcon(Context context) { 
    super(context); init(); } public VoisePlayingIcon(Context context, @Nullable AttributeSet attrs) { 
    super(context, attrs); //取出自定义属性 TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.voisePlayingIconAttr); pointerColor = ta.getColor(R.styleable.voisePlayingIconAttr_pointer_color, Color.RED); pointerNum = ta.getInt(R.styleable.voisePlayingIconAttr_pointer_num, 4);//指针的数量，默认为4 pointerWidth = DensityUtils.dp2px(getContext(), ta.getFloat(R.styleable.voisePlayingIconAttr_pointer_width, 5f));//指针的宽度，默认5dp pointerSpeed = ta.getInt(R.styleable.voisePlayingIconAttr_pointer_speed, 40); init(); } public VoisePlayingIcon(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { 
    super(context, attrs, defStyleAttr); TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.voisePlayingIconAttr); pointerColor = ta.getColor(R.styleable.voisePlayingIconAttr_pointer_color, Color.RED); pointerNum = ta.getInt(R.styleable.voisePlayingIconAttr_pointer_num, 4); pointerWidth = DensityUtils.dp2px(getContext(), ta.getFloat(R.styleable.voisePlayingIconAttr_pointer_width, 5f)); pointerSpeed = ta.getInt(R.styleable.voisePlayingIconAttr_pointer_speed, 40); init(); } / * 初始化画笔与指针的集合 */ private void init() { 
    paint = new Paint(); paint.setAntiAlias(true); paint.setColor(pointerColor); pointers = new ArrayList<>(); } / * 在onLayout中做一些，宽高方面的初始化 * * @param changed * @param left * @param top * @param right * @param bottom */ @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 
    super.onLayout(changed, left, top, right, bottom); //获取逻辑原点的，也就是画布左下角的坐标。这里减去了paddingBottom的距离 basePointY = getHeight() - getPaddingBottom(); Random random = new Random(); if (pointers != null) pointers.clear(); for (int i = 0; i < pointerNum; i++) { 
    //创建指针对象，利用0~1的随机数 乘以 可绘制区域的高度。作为每个指针的初始高度。 pointers.add(new Pointer((float) (0.1 * (random.nextInt(10) + 1) * (getHeight() - getPaddingBottom() - getPaddingTop())))); } //计算每个指针之间的间隔 总宽度 - 左右两边的padding - 所有指针占去的宽度 然后再除以间隔的数量 pointerPadding = (getWidth() - getPaddingLeft() - getPaddingRight() - pointerWidth * pointerNum) / (pointerNum - 1); } / * 开始绘画 * * @param canvas */ @Override protected void onDraw(Canvas canvas) { 
    super.onDraw(canvas); //将x坐标移动到逻辑原点，也就是左下角 basePointX = 0f + getPaddingLeft(); //循环绘制每一个指针。 for (int i = 0; i < pointers.size(); i++) { 
    //绘制指针，也就是绘制矩形 canvas.drawRect(basePointX, basePointY - pointers.get(i).getHeight(), basePointX + pointerWidth, basePointY, paint); basePointX += (pointerPadding + pointerWidth); } } / * 开始播放 */ public void start() { 
    if (!isPlaying) { 
    if (myThread == null) { 
   //开启子线程 myThread = new Thread(new MyRunnable()); myThread.start(); } isPlaying = true;//控制子线程中的循环 } } / * 停止子线程，并刷新画布 */ public void stop() { 
    isPlaying = false; invalidate(); } / * 处理子线程发出来的指令，然后刷新布局 */ private Handler myHandler = new Handler() { 
    @Override public void handleMessage(Message msg) { 
    super.handleMessage(msg); invalidate(); } }; / * 子线程，循环改变每个指针的高度 */ public class MyRunnable implements Runnable { 
    @Override public void run() { 
    for (float i = 0; i < Integer.MAX_VALUE; ) { 
   //创建一个死循环，每循环一次i+0.1 try { 
    for (int j = 0; j < pointers.size(); j++) { 
    //循环改变每个指针高度 float rate = (float) Math.abs(Math.sin(i + j));//利用正弦有规律的获取0~1的数。 try { 
    pointers.get(j).setHeight((basePointY - getPaddingTop()) * rate); //rate 乘以 可绘制高度，来改变每个指针的高度 }catch (Exception e){ 
    Log.e("VoisePlayingIcon", "run: pointers.get(j).setHeight出错："+e.getMessage().toString()); } } Thread.sleep(pointerSpeed);//休眠一下下，可自行调节 if (isPlaying) { 
    //控制开始/暂停 myHandler.sendEmptyMessage(0); i += 0.1; } } catch (InterruptedException e) { 
    e.printStackTrace(); } } } } / * 指针对象 */ public class Pointer { 
    private float height; public Pointer(float height) { 
    this.height = height; } public float getHeight() { 
    return height; } public void setHeight(float height) { 
    this.height = height; } } } 

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