Android仿百度地图小度语音助手的贝塞尔曲线动画

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

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