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小编给大家分享一下Android如何实现仿百度地图小度语音助手的贝塞尔曲线动画，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
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具体内容如下
效果图
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 h2 = 200,h3 = 200, h4 = 300,h5 = 300,h6 = 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-h2, 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-h3, 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-h4, 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-h5, 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-h6, 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) {
h2 = (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) {
h3 = (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) {
h4 = (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) {
h5 = (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) {
h6 = (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
以上是“Android如何实现仿百度地图小度语音助手的贝塞尔曲线动画”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注创新互联行业资讯频道！
