本文为大家分享了Android仿小度语音助手的贝塞尔曲线动画，供大家参考，具体内容如下

废话不多说，看下面的动图，和百度的还是有点点差别，我也不修改了，很简单，我实在是没有多余的时间，还要学习其他的东西。

package com.example.helang.volumewave;

import android.animation.ValueAnimator;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.LinearGradient;

import android.graphics.Paint;

import android.graphics.Path;

import android.graphics.Shader;

import android.support.annotation.Nullable;

import android.util.AttributeSet;

import android.view.View;

import android.view.animation.DecelerateInterpolator;

import java.util.Random;

/**

* 仿百度的语音助手--波浪动画控件

*/

public class VolumeWaveView extends View {

private static final String TAG = "VolumeWaveView";

private static final int HEIGHT = 400;//整个控件的高度

private static final int HEIGHT1 = 200;//第一层曲线的高度

private static final int HEIGHT2 = 400;//第二层曲线的高度

private static final int HEIGHT3 = 350;//第三层曲线的高度

private float h1 = 200,h2 = 200, h3 = 300,h4 = 300,h5 = 200;

private int range = 0;//波动的幅度,你可以动态改变这个值，比如麦克风录入的音量的高低

private static final int splitWidth = -200;//扇形的交错距离

private Path path;

private Paint paint1,paint2,paint3,paint4;

private LinearGradient linearGradient1,linearGradient2,linearGradient3,linearGradient4;//四种渐变色

private ValueAnimator animator1,animator2,animator3,animator4,animator5;//五种动画

public VolumeWaveView(Context context) {

this(context,null);

}

public VolumeWaveView(Context context, @Nullable AttributeSet attrs) {

this(context,attrs,0);

}

public VolumeWaveView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {

super(context, attrs,defStyleAttr);

initPaint();

}

private void initPaint(){

path = new Path();

paint1 = new Paint();

paint1.setStyle(Paint.Style.FILL);

paint1.setAntiAlias(true);//抗锯齿

//渐变色1

linearGradient1 = new LinearGradient(0, 0, 0, HEIGHT1,

Color.parseColor("#e652a6d2"), Color.parseColor("#e652d5a1"), Shader.TileMode.MIRROR);

paint1.setShader(linearGradient1);

paint2 = new Paint();

paint2.setAntiAlias(true);//抗锯齿

paint2.setStyle(Paint.Style.FILL);

//渐变色2

linearGradient2 = new LinearGradient(0, 0, 0, HEIGHT2,

Color.parseColor("#e68952d5"), Color.parseColor("#e6525dd5"), Shader.TileMode.MIRROR);

paint2.setShader(linearGradient2);

paint3 = new Paint();

paint3.setAntiAlias(true);//抗锯齿

paint3.setStyle(Paint.Style.FILL);

//渐变色3

linearGradient3 = new LinearGradient(0, 0, 0, HEIGHT3,

Color.parseColor("#e66852d5"), Color.parseColor("#e651b9d2"), Shader.TileMode.MIRROR);

paint3.setShader(linearGradient3);

paint4 = new Paint();

paint4.setAntiAlias(true);//抗锯齿

paint4.setStyle(Paint.Style.FILL);

//渐变色4

linearGradient4 = new LinearGradient(0, 0, 0, HEIGHT2,

Color.parseColor("#e6d5527e"), Color.parseColor("#e6bf52d5"), Shader.TileMode.MIRROR);

paint4.setShader(linearGradient4);

}

/**

* draw方法中不要创建大量对象，尽量复用对象

* @param canvas

*/

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

drawLayer3(canvas);

drawLayer2(canvas);

drawLayer1(canvas);

}

/**

* 绘制第一层

* @param canvas

*/

private void drawLayer1(Canvas canvas){

path.reset();//重置path

path.moveTo(0, HEIGHT);//起点

path.quadTo(getWidth()/4, HEIGHT-h1, getWidth()/2, HEIGHT);//第一条二阶贝塞尔曲线

path.moveTo(getWidth()/2+splitWidth,HEIGHT);

path.quadTo(getWidth()/2+splitWidth+getWidth()/4, HEIGHT-h2, getWidth(), HEIGHT);//第二条二阶贝塞尔曲线

canvas.drawPath(path,paint1);

}

/**

* 绘制第二层

* @param canvas

*/

private void drawLayer2(Canvas canvas){

path.reset();//重置path

path.moveTo(0, HEIGHT);//起点

path.quadTo(getWidth()/4, HEIGHT-h3, getWidth()/2, HEIGHT);//第一条二阶贝塞尔曲线

canvas.drawPath(path,paint2);

path.reset();

path.moveTo(getWidth()/2+splitWidth,HEIGHT);

path.quadTo(getWidth()/2+getWidth()/4, HEIGHT-h4, getWidth(), HEIGHT);//第二条二阶贝塞尔曲线

canvas.drawPath(path,paint4);

}

/**

* 绘制第三层

* @param canvas

*/

private void drawLayer3(Canvas canvas){

path.reset();//重置path

path.moveTo(200,HEIGHT);

path.quadTo(200+getWidth()/3, HEIGHT-h5, getWidth(), HEIGHT);//二阶贝塞尔曲线

canvas.drawPath(path,paint3);

}

/**

* 添加属性动画

*/

public void startAnimation() {

Random random = new Random();

range = random.nextInt(100)%(100-10+1) + 10;//波动的幅度，模拟动态音量输入，你可以自己设置

animator1 = ValueAnimator.ofInt(0,HEIGHT1,0);

animator1.setDuration(1400);

animator1.setInterpolator(new DecelerateInterpolator());

//无限循环

animator1.setRepeatCount(ValueAnimator.INFINITE);

animator1.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

@Override

public void onAnimationUpdate(ValueAnimator animation) {

h1 = (int) animation.getAnimatedValue();

invalidate();

}

});

animator1.start();

animator2 = ValueAnimator.ofInt(0,HEIGHT1,0);

animator2.setDuration(1700);

animator2.setInterpolator(new DecelerateInterpolator());

//无限循环

animator2.setRepeatCount(ValueAnimator.INFINITE);

animator2.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

@Override

public void onAnimationUpdate(ValueAnimator animation) {

h2 = (int) animation.getAnimatedValue();

invalidate();

}

});

animator2.start();

animator3 = ValueAnimator.ofInt(0,HEIGHT2,0);

animator3.setDuration(1600);

animator3.setInterpolator(new DecelerateInterpolator());

//无限循环

animator3.setRepeatCount(ValueAnimator.INFINITE);

animator3.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

@Override

public void onAnimationUpdate(ValueAnimator animation) {

h3 = (int) animation.getAnimatedValue() + range;

invalidate();

}

});

animator3.start();

animator4 = ValueAnimator.ofInt(0,HEIGHT2,0);

animator4.setDuration(1300);

animator4.setInterpolator(new DecelerateInterpolator());

//无限循环

animator4.setRepeatCount(ValueAnimator.INFINITE);

animator4.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

@Override

public void onAnimationUpdate(ValueAnimator animation) {

h4 = (int) animation.getAnimatedValue();

invalidate();

}

});

animator4.start();

animator5 = ValueAnimator.ofInt(0,HEIGHT2,0);

animator5.setDuration(1250);

animator5.setInterpolator(new DecelerateInterpolator());

//无限循环

animator5.setRepeatCount(ValueAnimator.INFINITE);

animator5.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

@Override

public void onAnimationUpdate(ValueAnimator animation) {

h5 = (int) animation.getAnimatedValue();

invalidate();

}

});

animator5.start();

}

/**

* 关闭动画

*/

public void removeAnimation(){

if (animator1 != null){

animator1.cancel();

animator1 = null;

}

if (animator2 != null){

animator2.cancel();

animator2 = null;

}

if (animator3 != null){

animator3.cancel();

animator3 = null;

}

if (animator4 != null){

animator4.cancel();

animator4 = null;

}

if (animator5 != null){

animator5.cancel();

animator5 = null;

}

}

}

主要是利用Path中的贝塞尔曲线，然后加上属性动画，动态改变曲线的高度就可以了

喜欢的话，就去github给个star吧

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。