Android自定义view之围棋动画效果的实现

前言

废话不多说直接开始

老规矩，文章最后有源码

完成效果图

棋子加渐变色

棋子不加渐变色

一、测量

1.获取宽高

 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  mWidth = w;
  mHeight = h;
  useWidth = mWidth;
  if (mWidth > mHeight) {
   useWidth = mHeight;
  }
 }

2.定义测量最小长度

将布局分为10份。以minwidth的1，3，5，7，9的倍数为标准点。

minwidth = useWidth / 10;

二、绘制背景（棋盘）

1.初始化画笔

 mPaint = new Paint();  //创建画笔对象
  mPaint.setColor(Color.BLACK); //设置画笔颜色
  mPaint.setStyle(Paint.Style.FILL); //设置画笔模式为填充
  mPaint.setStrokeWidth(4f);  //设置画笔宽度为10px
  mPaint.setAntiAlias(true);  //设置抗锯齿
  mPaint.setAlpha(255);  //设置画笔透明度

2.画棋盘

 //细的X轴
  canvas.drawLine(minwidth, 3 * minwidth, 9 * minwidth, 3 * minwidth, mPaint);// 斜线
  canvas.drawLine(minwidth, 5 * minwidth, 9 * minwidth, 5 * minwidth, mPaint);// 斜线
  canvas.drawLine(minwidth, 7 * minwidth, 9 * minwidth, 7 * minwidth, mPaint);// 斜线
  //细的y轴
  canvas.drawLine(3 * minwidth, minwidth, 3 * minwidth, 9 * minwidth, mPaint);// 斜线
  canvas.drawLine(5 * minwidth, minwidth, 5 * minwidth, 9 * minwidth, mPaint);// 斜线
  canvas.drawLine(7 * minwidth, minwidth, 7 * minwidth, 9 * minwidth, mPaint);// 斜线
  mPaint.setStrokeWidth(8f);
  //粗的X轴（边框）
  canvas.drawLine(minwidth, minwidth, 9 * minwidth, minwidth, mPaint);// 斜线
  canvas.drawLine(minwidth, 9 * minwidth, 9 * minwidth, 9 * minwidth, mPaint);// 斜线
  //粗的y轴（边框）
  canvas.drawLine(minwidth, minwidth, minwidth, 9 * minwidth, mPaint);// 斜线
  canvas.drawLine(9 * minwidth, minwidth, 9 * minwidth, 9 * minwidth, mPaint);// 斜线

绘制完后，发现有点小瑕疵
效果图：

3.补棋盘瑕疵

canvas.drawPoint(minwidth, minwidth, mPaint);
  canvas.drawPoint(9 * minwidth, minwidth, mPaint);
  canvas.drawPoint(minwidth, 9 * minwidth, mPaint);
  canvas.drawPoint(9 * minwidth, 9 * minwidth, mPaint);

效果图：

三.画个不可改变的棋子（以便于了解动画移动位置）

位置比例
（3,3）（3,5）（3,7）
（5,3）（5,5）（5,7）
（7,3）（7,5）（7,7）

 //画围棋
  canvas.drawCircle(3*minwidth, 3*minwidth, useWidth/16, mPaint);
  canvas.drawCircle(3*minwidth, 7*minwidth, useWidth/16, mPaint);
  canvas.drawCircle(5*minwidth, 5*minwidth, useWidth/16, mPaint);
  canvas.drawCircle(7*minwidth, 3*minwidth, useWidth/16, mPaint);
  canvas.drawCircle(7*minwidth, 7*minwidth, useWidth/16, mPaint);
  mPaint.setColor(rightcolor);
  canvas.drawCircle(3*minwidth, 5*minwidth, useWidth/16, mPaint);
  canvas.drawCircle(5*minwidth, 3*minwidth, useWidth/16, mPaint);
  canvas.drawCircle(5*minwidth, 7*minwidth, useWidth/16, mPaint);
  canvas.drawCircle(7*minwidth, 5*minwidth, useWidth/16, mPaint);

效果图：

四.为动画开始做准备以及动画

1.三个辅助类为动画做准备（参数模仿Android官方Demo）

主要为get set构造，代码会贴到最后

2.自定义该接口实例来控制动画的更新计算表达式

public class XYEvaluator implements TypeEvaluator {
 public Object evaluate(float fraction, Object startValue, Object endValue) {
  XYHolder startXY = (XYHolder) startValue;
  XYHolder endXY = (XYHolder) endValue;
  return new XYHolder(startXY.getX() + fraction * (endXY.getX() - startXY.getX()),
    startXY.getY() + fraction * (endXY.getY() - startXY.getY()));
 }
}

3.棋子的创建

private ShapeHolder createBall(float x, float y, int color) {
  OvalShape circle = new OvalShape();
  circle.resize(useWidth / 8f, useWidth / 8f);
  ShapeDrawable drawable = new ShapeDrawable(circle);
  ShapeHolder shapeHolder = new ShapeHolder(drawable);
  shapeHolder.setX(x - useWidth / 16f);
  shapeHolder.setY(y - useWidth / 16f);
  Paint paint = drawable.getPaint();
  paint.setColor(color);
  return shapeHolder;
 }

4.动画的创建

 private void createAnimation() {
  if (bounceAnim == null) {
   XYHolder lstartXY = new XYHolder(3 * minwidth - useWidth / 16f, 3 * minwidth - useWidth / 16f);
   XYHolder processXY = new XYHolder(7 * minwidth - useWidth / 16f, 3 * minwidth - useWidth / 16f);
   XYHolder lendXY = new XYHolder(7 * minwidth - useWidth / 16f, 7 * minwidth - useWidth / 16f);
   bounceAnim = ObjectAnimator.ofObject(ballHolder, "xY",
     new XYEvaluator(), lstartXY, processXY, lendXY, lstartXY);
   bounceAnim.setDuration(animaltime);
   bounceAnim.setRepeatCount(ObjectAnimator.INFINITE);
   bounceAnim.setRepeatMode(ObjectAnimator.RESTART);
   bounceAnim.addUpdateListener(this);
  }
  if (bounceAnim1 == null) {
   XYHolder lstartXY = new XYHolder(7 * minwidth - useWidth / 16f, 7 * minwidth - useWidth / 16f);
   XYHolder processXY = new XYHolder(3 * minwidth - useWidth / 16f, 7 * minwidth - useWidth / 16f);
   XYHolder lendXY = new XYHolder(3 * minwidth - useWidth / 16f, 3 * minwidth - useWidth / 16f);
   bounceAnim1 = ObjectAnimator.ofObject(ballHolder1, "xY",
     new XYEvaluator(), lstartXY, processXY, lendXY, lstartXY);
   bounceAnim1.setDuration(animaltime);
   bounceAnim1.setRepeatCount(ObjectAnimator.INFINITE);
   bounceAnim1.setRepeatMode(ObjectAnimator.RESTART);
   bounceAnim1.addUpdateListener(this);
  }
 }

5.两个动画的同步执行

AnimatorSet animatorSet = new AnimatorSet();
  animatorSet.play(bounceAnim).with(bounceAnim1);
  animatorSet.start();

6.效果图

视觉效果：感觉白子不太明显

7.解决第6步问题

在棋子的创建方法中添加渐变色

 RadialGradient gradient = new RadialGradient(useWidth / 16f, useWidth / 16f,
    useWidth / 8f, color, Color.GRAY, Shader.TileMode.CLAMP);
  paint.setShader(gradient);
  shapeHolder.setPaint(paint);

效果图：

五.自定义属性

attrs文件：

 <declare-styleable name="WeiqiView">
<!--  黑子颜色-->
  <attr name="leftscolor" format="reference|color"/>
<!--  白子颜色-->
  <attr name="rightscolor" format="reference|color"/>
<!--  棋盘颜色-->
  <attr name="qipancolor" format="reference|color"/>
<!--  动画时间-->
  <attr name="animalstime" format="integer"/>
 </declare-styleable>

java文件中获取

 /**
  * 获取自定义属性
  */
 private void initCustomAttrs(Context context, AttributeSet attrs) {
  //获取自定义属性
  TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.WeiqiView);
  //获取颜色
  leftcolor = ta.getColor(R.styleable.WeiqiView_leftscolor, Color.BLACK);
  rightcolor = ta.getColor(R.styleable.WeiqiView_rightscolor, Color.WHITE);
  qipancolor = ta.getColor(R.styleable.WeiqiView_qipancolor, Color.BLACK);
  //获取动画时间
  animaltime = ta.getInt(R.styleable.WeiqiView_animalstime, 2000);
  //回收
  ta.recycle();

 }

六.自定义属性设置后运行效果

七.小改变，视觉效果就不一样了！

然后，把背景注释，像不像那些等待动画？

八.源码

WeiqiView.java

public class WeiqiView extends View implements ValueAnimator.AnimatorUpdateListener {
 private Paint mPaint;
 private int mWidth;
 private int mHeight;
 private int useWidth, minwidth;
 private int leftcolor;
 private int rightcolor;
 private int qipancolor;
 private int animaltime;
 //画一个圆（棋子）
 ValueAnimator bounceAnim, bounceAnim1 = null;
 ShapeHolder ball, ball1 = null;
 QiziXYHolder ballHolder, ballHolder1 = null;

 @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
 public WeiqiView(Context context) {
  this(context, null);
 }

 @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
 public WeiqiView(Context context, @Nullable AttributeSet attrs) {
  this(context, attrs, 0);
 }

 @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
 public WeiqiView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
  this(context, attrs, defStyleAttr, 0);
  initCustomAttrs(context, attrs);
 }

 @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
 public WeiqiView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
  super(context, attrs, defStyleAttr, defStyleRes);

 }

 private void init() {
  initPaint();
 }

 /**
  * 获取自定义属性
  */
 private void initCustomAttrs(Context context, AttributeSet attrs) {
  //获取自定义属性。
  TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.WeiqiView);
  //获取颜色
  leftcolor = ta.getColor(R.styleable.WeiqiView_leftscolor, Color.BLACK);
  rightcolor = ta.getColor(R.styleable.WeiqiView_rightscolor, Color.WHITE);
  qipancolor = ta.getColor(R.styleable.WeiqiView_qipancolor, Color.BLACK);
  animaltime = ta.getInt(R.styleable.WeiqiView_animalstime, 2000);
  //回收
  ta.recycle();

 }

 /**
  * 初始化画笔
  */
 private void initPaint() {
  mPaint = new Paint();  //创建画笔对象
  mPaint.setColor(Color.BLACK); //设置画笔颜色
  mPaint.setStyle(Paint.Style.FILL); //设置画笔模式为填充
  mPaint.setStrokeWidth(4f);  //设置画笔宽度为10px
  mPaint.setAntiAlias(true);  //设置抗锯齿
  mPaint.setAlpha(255);  //设置画笔透明度
 }

 @Override
 protected void onSizeChanged(int w, int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  mWidth = w;
  mHeight = h;
  useWidth = mWidth;
  if (mWidth > mHeight) {
   useWidth = mHeight;
  }
 }

 @RequiresApi(api = Build.VERSION_CODES.KITKAT)
 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  init();
  minwidth = useWidth / 10;
  mPaint.setColor(qipancolor);
  if (ball == null) {
   ball = createBall(3 * minwidth, 3 * minwidth, leftcolor);
   ballHolder = new QiziXYHolder(ball);
  }
  if (ball1 == null) {
   ball1 = createBall(7 * minwidth, 7 * minwidth, rightcolor);
   ballHolder1 = new QiziXYHolder(ball1);
  }
  //细的X轴
  canvas.drawLine(minwidth, 3 * minwidth, 9 * minwidth, 3 * minwidth, mPaint);// 斜线
  canvas.drawLine(minwidth, 5 * minwidth, 9 * minwidth, 5 * minwidth, mPaint);// 斜线
  canvas.drawLine(minwidth, 7 * minwidth, 9 * minwidth, 7 * minwidth, mPaint);// 斜线
  //细的y轴
  canvas.drawLine(3 * minwidth, minwidth, 3 * minwidth, 9 * minwidth, mPaint);// 斜线
  canvas.drawLine(5 * minwidth, minwidth, 5 * minwidth, 9 * minwidth, mPaint);// 斜线
  canvas.drawLine(7 * minwidth, minwidth, 7 * minwidth, 9 * minwidth, mPaint);// 斜线
  mPaint.setStrokeWidth(8f);
  //粗的X轴（边框）
  canvas.drawLine(minwidth, minwidth, 9 * minwidth, minwidth, mPaint);// 斜线
  canvas.drawLine(minwidth, 9 * minwidth, 9 * minwidth, 9 * minwidth, mPaint);// 斜线
  //粗的y轴（边框）
  canvas.drawLine(minwidth, minwidth, minwidth, 9 * minwidth, mPaint);// 斜线
  canvas.drawLine(9 * minwidth, minwidth, 9 * minwidth, 9 * minwidth, mPaint);// 斜线
  //补瑕疵
  canvas.drawPoint(minwidth, minwidth, mPaint);
  canvas.drawPoint(9 * minwidth, minwidth, mPaint);
  canvas.drawPoint(minwidth, 9 * minwidth, mPaint);
  canvas.drawPoint(9 * minwidth, 9 * minwidth, mPaint);
//  //画围棋
//  canvas.drawCircle(3*minwidth, 3*minwidth, useWidth/16, mPaint);
//  canvas.drawCircle(3*minwidth, 7*minwidth, useWidth/16, mPaint);
//  canvas.drawCircle(5*minwidth, 5*minwidth, useWidth/16, mPaint);
//  canvas.drawCircle(7*minwidth, 3*minwidth, useWidth/16, mPaint);
//  canvas.drawCircle(7*minwidth, 7*minwidth, useWidth/16, mPaint);
//  mPaint.setColor(rightcolor);
//  canvas.drawCircle(3*minwidth, 5*minwidth, useWidth/16, mPaint);
//  canvas.drawCircle(5*minwidth, 3*minwidth, useWidth/16, mPaint);
//  canvas.drawCircle(5*minwidth, 7*minwidth, useWidth/16, mPaint);
//  canvas.drawCircle(7*minwidth, 5*minwidth, useWidth/16, mPaint);

  canvas.save();
  canvas.translate(ball.getX(), ball.getY());
  ball.getShape().draw(canvas);
  canvas.restore();

  canvas.save();
  canvas.translate(ball1.getX(), ball1.getY());
  ball1.getShape().draw(canvas);
  canvas.restore();
 }

 private ShapeHolder createBall(float x, float y, int color) {
  OvalShape circle = new OvalShape();
  circle.resize(useWidth / 8f, useWidth / 8f);
  ShapeDrawable drawable = new ShapeDrawable(circle);
  ShapeHolder shapeHolder = new ShapeHolder(drawable);
  shapeHolder.setX(x - useWidth / 16f);
  shapeHolder.setY(y - useWidth / 16f);
  Paint paint = drawable.getPaint();
  paint.setColor(color);
  RadialGradient gradient = new RadialGradient(useWidth / 16f, useWidth / 16f,
    useWidth / 8f, color, Color.GRAY, Shader.TileMode.CLAMP);
  paint.setShader(gradient);
  shapeHolder.setPaint(paint);
  return shapeHolder;
 }

 private void createAnimation() {
  if (bounceAnim == null) {
   XYHolder lstartXY = new XYHolder(3 * minwidth - useWidth / 16f, 3 * minwidth - useWidth / 16f);
   XYHolder processXY = new XYHolder(7 * minwidth - useWidth / 16f, 3 * minwidth - useWidth / 16f);
   XYHolder lendXY = new XYHolder(7 * minwidth - useWidth / 16f, 7 * minwidth - useWidth / 16f);
   bounceAnim = ObjectAnimator.ofObject(ballHolder, "xY",
     new XYEvaluator(), lstartXY, processXY, lendXY, lstartXY);
   bounceAnim.setDuration(animaltime);
   bounceAnim.setRepeatCount(ObjectAnimator.INFINITE);
   bounceAnim.setRepeatMode(ObjectAnimator.RESTART);
   bounceAnim.addUpdateListener(this);
  }
  if (bounceAnim1 == null) {
   XYHolder lstartXY = new XYHolder(7 * minwidth - useWidth / 16f, 7 * minwidth - useWidth / 16f);
   XYHolder processXY = new XYHolder(3 * minwidth - useWidth / 16f, 7 * minwidth - useWidth / 16f);
   XYHolder lendXY = new XYHolder(3 * minwidth - useWidth / 16f, 3 * minwidth - useWidth / 16f);
   bounceAnim1 = ObjectAnimator.ofObject(ballHolder1, "xY",
     new XYEvaluator(), lstartXY, processXY, lendXY, lstartXY);
   bounceAnim1.setDuration(animaltime);
   bounceAnim1.setRepeatCount(ObjectAnimator.INFINITE);
   bounceAnim1.setRepeatMode(ObjectAnimator.RESTART);
   bounceAnim1.addUpdateListener(this);
  }
 }

 public void startAnimation() {
  createAnimation();
  AnimatorSet animatorSet = new AnimatorSet();
  animatorSet.play(bounceAnim).with(bounceAnim1);
  animatorSet.start();
 }

 @Override
 public void onAnimationUpdate(ValueAnimator animation) {
  invalidate();
 }
}

QiziXYHolder.java

public class QiziXYHolder {

 private ShapeHolder mBall;

 public QiziXYHolder(ShapeHolder ball) {
  mBall = ball;
 }

 public void setXY(XYHolder xyHolder) {
  mBall.setX(xyHolder.getX());
  mBall.setY(xyHolder.getY());
 }

 public XYHolder getXY() {
  return new XYHolder(mBall.getX(), mBall.getY());
 }
}

ShapeHolder.java

public class ShapeHolder {
 private float x = 0, y = 0;
 private ShapeDrawable shape;
 private int color;
 private RadialGradient gradient;
 private float alpha = 1f;
 private Paint paint;

 public void setPaint(Paint value) {
  paint = value;
 }
 public Paint getPaint() {
  return paint;
 }

 public void setX(float value) {
  x = value;
 }
 public float getX() {
  return x;
 }
 public void setY(float value) {
  y = value;
 }
 public float getY() {
  return y;
 }
 public void setShape(ShapeDrawable value) {
  shape = value;
 }
 public ShapeDrawable getShape() {
  return shape;
 }
 public int getColor() {
  return color;
 }
 public void setColor(int value) {
  shape.getPaint().setColor(value);
  color = value;
 }
 public void setGradient(RadialGradient value) {
  gradient = value;
 }
 public RadialGradient getGradient() {
  return gradient;
 }

 public void setAlpha(float alpha) {
  this.alpha = alpha;
  shape.setAlpha((int)((alpha * 255f) + .5f));
 }

 public float getWidth() {
  return shape.getShape().getWidth();
 }
 public void setWidth(float width) {
  Shape s = shape.getShape();
  s.resize(width, s.getHeight());
 }

 public float getHeight() {
  return shape.getShape().getHeight();
 }
 public void setHeight(float height) {
  Shape s = shape.getShape();
  s.resize(s.getWidth(), height);
 }

 public ShapeHolder(ShapeDrawable s) {
  shape = s;
 }
}

XYEvaluator.java

public class XYEvaluator implements TypeEvaluator {
 public Object evaluate(float fraction, Object startValue, Object endValue) {
  XYHolder startXY = (XYHolder) startValue;
  XYHolder endXY = (XYHolder) endValue;
  return new XYHolder(startXY.getX() + fraction * (endXY.getX() - startXY.getX()),
    startXY.getY() + fraction * (endXY.getY() - startXY.getY()));
 }
}

XYHolder.java

public class XYHolder {
 private float mX;
 private float mY;

 public XYHolder(float x, float y) {
  mX = x;
  mY = y;
 }

 public float getX() {
  return mX;
 }

 public void setX(float x) {
  mX = x;
 }

 public float getY() {
  return mY;
 }

 public void setY(float y) {
  mY = y;
 }
}

attrs.xml

<resources>
 <declare-styleable name="WeiqiView">
<!--  黑子颜色-->
  <attr name="leftscolor" format="reference|color"/>
<!--  白子颜色-->
  <attr name="rightscolor" format="reference|color"/>
<!--  棋盘颜色-->
  <attr name="qipancolor" format="reference|color"/>
<!--  动画时间-->
  <attr name="animalstime" format="integer"/>
 </declare-styleable>
</resources>

布局调用

<com.shenzhen.jimeng.lookui.UI.WeiqiView
 android:layout_centerInParent="true"
 android:id="@+id/weiqi"
 android:layout_width="400dp"
 android:layout_height="400dp"/>

activity文件中开启动画

weiqi = (WeiqiView) findViewById(R.id.weiqi);
  weiqi.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    weiqi.startAnimation();
   }
  });

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