自定义View--操作动画

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计算

这里写图片描述

import android.animation.ValueAnimator;import android.annotation.TargetApi;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PointF;import android.os.Build;import android.util.AttributeSet;import android.view.View;import java.util.ArrayList;import java.util.List;import app.hanks.com.customanimateview.R;/** * Created by Hanks on 2015/5/27. */public class OpAnimationView extends View {    private Paint paint;    private Paint paintShadow;    private int width;    private int height;    private int c;    private boolean isAnimating  = false;    //is isAnimating?    private boolean isRgihtShape = false;    //is in right_shap?    private float progress;        //animation‘s progress    private int DURATION = 300;      // animation DURATION    private int r;        //randius    private int shadowWidth;        //shadow randius    private int defaultShapeWidth;    private int shapeWidth;    public OpAnimationView(Context context) {        this(context, null);    }    public OpAnimationView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public OpAnimationView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init(context, attrs, defStyleAttr);    }    @TargetApi(Build.VERSION_CODES.LOLLIPOP)    public OpAnimationView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {        super(context, attrs, defStyleAttr, defStyleRes);    }    /**     * init paint     *     * @param context     * @param attrs     * @param defStyleAttr     */    private void init(Context context, AttributeSet attrs, int defStyleAttr) {        defaultShapeWidth = dp2px(4);        paint = new Paint(Paint.ANTI_ALIAS_FLAG);        paintShadow = new Paint(Paint.ANTI_ALIAS_FLAG);        setLayerType(LAYER_TYPE_SOFTWARE, paintShadow);        shadowWidth = dp2px(4);        paintShadow.setShadowLayer(shadowWidth, 0.0f, dp2px(2), Color.parseColor("#66000000"));        // load the styled attributes and set their properties        TypedArray attributes = context.obtainStyledAttributes(attrs, R.styleable.OpAnimationView, defStyleAttr, 0);        setBackgroundColor(attributes.getColor(R.styleable.OpAnimationView_backgroundColor, Color.parseColor("#FF4081")));        setShapeColor(attributes.getColor(R.styleable.OpAnimationView_shapeColor,Color.parseColor("#ffffff")));        shapeWidth = attributes.getDimensionPixelOffset(R.styleable.OpAnimationView_shapeWidth, defaultShapeWidth);        setShapeWidth(shapeWidth);        // We no longer need our attributes TypedArray, give it back to cache        attributes.recycle();    }    private List<PointF> points = new ArrayList<>();    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        width = w;        height = h;        r = Math.min(w, h) / 2 - shadowWidth;        float g2 = (float) Math.sqrt(2);        c = (int) (r / g2);        float dis = r - c + dp2px(4);        points.clear();        points.add(new PointF(c + dis, c / 3f + dis));        points.add(new PointF(c + dis, c * 5f / 3f + dis));        points.add(new PointF(c / 3f + dis, c + dis));        points.add(new PointF(c * 5f / 3f + dis, c + dis));        points.add(new PointF(c * (1 + 3 * g2) / 3f + dis, c * (3 - g2) / 3f + dis));        points.add(new PointF(c * (1 + g2) / 3f + shapeWidth / g2 / 2 + dis,c * (3 + g2) / 3f + shapeWidth / g2 / 2 + dis));        points.add(new PointF(c * (1 + g2) / 3f - shapeWidth / g2 / 2 + dis,c * (3 + g2) / 3f + shapeWidth / g2 / 2 + dis));    }    //set background circle color    public void setBackgroundColor(int color) {        paintShadow.setColor(color);    }    //set center shape color    public void setShapeColor(int color) {        paint.setColor(color);    }    public void setShapeWidth(int width) {        paint.setStrokeWidth(width);    }    @Override    protected void onDraw(Canvas canvas) {        canvas.drawCircle(width / 2, height / 2, r, paintShadow);        if (isRgihtShape) { // right --> add            float x0 = (points.get(0).x - points.get(4).x) * progress + points.get(4).x;            float y0 = (points.get(0).y - points.get(4).y) * progress + points.get(4).y;            float x1 = (points.get(1).x - points.get(6).x) * progress + points.get(6).x;            float y1 = (points.get(1).y - points.get(6).y) * progress + points.get(6).y;            float x2 = points.get(2).x;            float y2 = points.get(2).y;            float x3 = (points.get(3).x - points.get(5).x) * progress + points.get(5).x;            float y3 = (points.get(3).y - points.get(5).y) * progress + points.get(5).y;            canvas.drawLine(x0, y0, x1, y1, paint);            canvas.drawLine(x2, y2, x3, y3, paint);        } else { //add --> right            float x0 = (points.get(4).x - points.get(0).x) * progress + points.get(0).x;            float y0 = (points.get(4).y - points.get(0).y) * progress + points.get(0).y;            float x1 = (points.get(6).x - points.get(1).x) * progress + points.get(1).x;            float y1 = (points.get(6).y - points.get(1).y) * progress + points.get(1).y;            float x2 = points.get(2).x;            float y2 = points.get(2).y;            float x3 = (points.get(5).x - points.get(3).x) * progress + points.get(3).x;            float y3 = (points.get(5).y - points.get(3).y) * progress + points.get(3).y;            canvas.drawLine(x0, y0, x1, y1, paint);            canvas.drawLine(x2, y2, x3, y3, paint);        }    }    public boolean isRightShape() {        return isRgihtShape;    }    /**     * add_shape to right_shape     */    public void add2right() {        if (isAnimating) {            return;        }        progress = 0f;        isAnimating = true;        ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, 1);        valueAnimator.setDuration(DURATION);        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                progress = (float) animation.getAnimatedValue();                if (progress >= 1) {                    isRgihtShape = true;                    isAnimating = false;                } else {                    invalidate();                }            }        });        valueAnimator.start();    }    /**     * right_shape  to add_shape     */    public void right2add() {        if (isAnimating) {            return;        }        progress = 0f;        isAnimating = true;        ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, 1);        valueAnimator.setDuration(DURATION);        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                progress = (float) animation.getAnimatedValue();                if (progress >= 1) {                    isRgihtShape = false;                    isAnimating = false;                } else {                    invalidate();                }            }        });        valueAnimator.start();    }    /**     * dp×ª px.     *     * @param value the value     * @return the int     */    public int dp2px(float value) {        final float scale = getResources().getDisplayMetrics().densityDpi;        return (int) (value * (scale / 160) + 0.5f);    }}

attrs.xml：

<resources>    <declare-styleable name="OpAnimationView">        <attr name="backgroundColor" format="color"></attr>        <attr name="shapeColor" format="color"></attr>        <attr name="shapeWidth" format="dimension"></attr>    </declare-styleable></resources>

源码

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