直播软件开发，Android自定义简单的音频波谱view
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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