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Android自定义view之围棋动画

很久不见，最近粉丝要求上新一篇有点难度的自定义view文章，因此它来了！！android

干货文,建议收藏canvas

前言

废话很少说直接开始api

文章最后有源码markdown

完成效果图

棋子加渐变色ide

棋子不加渐变色布局

1、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;
        }
    }
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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。post

minwidth = useWidth / 10;
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2、绘制背景（棋盘）

1.初始化画笔

mPaint = new Paint();        //建立画笔对象
        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
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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
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绘制完后，发现有点小瑕疵动画

效果图：ui

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);
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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);
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效果图：

四.为动画开始作准备以及动画

1.三个辅助类为动画作准备（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()));
    }
}
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3.棋子的建立

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;
    }
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4.动画的建立

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);
        }
    }
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5.两个动画的同步执行

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

视觉效果：感受白子不太明显

7.解决第6步问题

在棋子的建立方法中添加渐变色

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

    }
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六.自定义属性设置后运行效果

七.小改变，视觉效果就不同了！

而后，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();        //建立画笔对象
        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();
    }
}
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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());
    }
}
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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;
    }
}
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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()));
    }
}
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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;
    }
}
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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>
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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"/>
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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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总结

但愿对您有所帮助，欢迎留言。若有问题可联系计蒙。