自绘双色旋转圈View-优快云博客

本文介绍了一个自定义的Android View组件，该组件能够显示一个双色的旋转圈动画。通过设置不同的颜色、速度及宽度等属性实现个性化定制。

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废话不多说，直接上代码

public class CricleView extends View {
    /**
     * 第一圈的颜色
     */
    private int mFirstColor;
    /**
     * 第二圈的颜色
     */
    private int mSecondColor;
    /**
     * 圈的宽度
     */
    private int mCircleWidth;
    /**
     * 画笔
     */
    private Paint mPaint;
    /**
     * 当前进度
     */
    private int mProgress;

    /**
     * 速度
     */
    private int mSpeed;

    /**
     * 是否应该开始下一个
     */
    private boolean isNext = false;
    public CricleView(Context context) {
        this(context, null);
    }

    public CricleView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CricleView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CricleView, defStyleAttr, 0);
        int n = a.getIndexCount();

        for (int i = 0; i < n; i++)
        {
            int attr = a.getIndex(i);
            switch (attr)
            {
                case R.styleable.CricleView_firstColor:
                    mFirstColor = a.getColor(attr, Color.GREEN);
                    break;
                case R.styleable.CricleView_secondColor:
                    mSecondColor = a.getColor(attr, Color.RED);
                    break;
                case R.styleable.CricleView_circleWidth:
                    mCircleWidth = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(
                            TypedValue.COMPLEX_UNIT_PX, 20, getResources().getDisplayMetrics()));
                    break;
                case R.styleable.CricleView_speed:
                    mSpeed = a.getInt(attr, 20);// 默认20
                    break;
            }
        }
        a.recycle();

        mPaint = new Paint();
        // 绘图线程
        new Thread()
        {
            public void run()
            {
                while (true)
                {
                    mProgress++;
                    if (mProgress == 360)
                    {
                        mProgress = 0;
                        if (!isNext)
                            isNext = true;
                        else
                            isNext = false;
                    }
                    postInvalidate();
                    try
                    {
                        Thread.sleep(mSpeed);
                    } catch (InterruptedException e)
                    {
                        e.printStackTrace();
                    }
                }
            };
        }.start();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        int centre = getWidth() / 2; // 获取圆心的x坐标
        int radius = centre - mCircleWidth / 2;// 半径
        mPaint.setStrokeWidth(mCircleWidth); // 设置圆环的宽度
        mPaint.setAntiAlias(true); // 消除锯齿
        mPaint.setStyle(Paint.Style.STROKE); // 设置空心
        RectF oval = new RectF(centre - radius, centre - radius, centre + radius, centre + radius); // 用于定义的圆弧的形状和大小的界限
        if (!isNext)
        {// 第一颜色的圈完整，第二颜色跑
            mPaint.setColor(mFirstColor); // 设置圆环的颜色
            canvas.drawCircle(centre, centre, radius, mPaint); // 画出圆环
            mPaint.setColor(mSecondColor); // 设置圆环的颜色
            canvas.drawArc(oval, -90, mProgress, false, mPaint); // 根据进度画圆弧
        } else
        {
            mPaint.setColor(mSecondColor); // 设置圆环的颜色
            canvas.drawCircle(centre, centre, radius, mPaint); // 画出圆环
            mPaint.setColor(mFirstColor); // 设置圆环的颜色
            canvas.drawArc(oval, -90, mProgress, false, mPaint); // 根据进度画圆弧
        }

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        float x = event.getX();
        float y = event.getY();
        float v = x%y;
        this.invalidate();
        return true;

    }
}
在values下创建一个文件，内容如下