翻翻git之---自己定义邮件发送buttonSendButton(流程分析，实现思路能够学习下)

转载请注明出处：王亟亟的大牛之路

距离过春节还有1天。继续这一系列的git翻料之旅。

昨天的工具类真的非常棒，这里再推崇一下 传送门：http://blog.csdn.net/ddwhan0123/article/details/50624061 （实际去体验的小伙伴都说好）

今天上一个自己定义的Button:SendButton

效果：

比較建议把代码抠出来由于内容不多，一个类就画完了

地址：https://github.com/ddwhan0123/SendButton

由于内容不多。我们就来分析下

public class SendButton extends View

31行。继承View而不是ViewGroup(也就是不像一个Layout为底板 其中画东西了，纯画)

    int flag = 0;
    Point a, b, c, d, e;
    Path mOutlinePath, mPlanePath;
    int mButtonColor, mButtonSide, mBorderStrokeWidth, mPlaneStrokeWidth, mPlaneColor;
    Paint mBackgroundPaint, mPlanePaint;
    ValueAnimator mPlaneAnimator;
    long mDuration;
    AnimationType mAnimationType;

35-42,定义了一系列变量，动画模式啊，持续时间啊。画笔啊，尺寸什么的

public SendButton(Context context, AttributeSet attrs)
    {
        super(context, attrs);

        TypedArray a = context.getTheme().obtainStyledAttributes(
                attrs,
                R.styleable.SendButton,
                0, 0);
        try
        {
            mButtonColor = a.getColor(R.styleable.SendButton_buttonColor, Color.WHITE);
            mButtonSide = a.getDimensionPixelSize(R.styleable.SendButton_buttonSide, 200);
            mBorderStrokeWidth = a.getInteger(R.styleable.SendButton_borderStrokeWidth, 5);
            mPlaneStrokeWidth = a.getInteger(R.styleable.SendButton_planeStrokeWidth, 5);
            mPlaneColor = a.getColor(R.styleable.SendButton_planeColor, getResources().getColor(R.color.orange));
            mAnimationType = AnimationType.values()[a.getInteger(R.styleable
                    .SendButton_animationType, 0)];
            mDuration = a.getInteger(R.styleable.SendButton_duration, 3000);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        finally
        {
            a.recycle();
        }

        init();
    }

45-74,构造函数，获取标签的一系列内容，然后把前面那些变量填充了一下，然后调用了init()方法。

private void init()
    {
        mBackgroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPlanePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mBackgroundPaint.setStyle(Paint.Style.STROKE);
        mPlanePaint.setStrokeWidth(mPlaneStrokeWidth);
        mBackgroundPaint.setStrokeWidth(mBorderStrokeWidth);
        mBackgroundPaint.setColor(mButtonColor);
        mOutlinePath = new Path();
        mPlanePath = new Path();
        mPlaneAnimator = ValueAnimator.ofInt(0, 75);
        mPlaneAnimator.setDuration(mDuration);
        mPlaneAnimator.setRepeatMode(ValueAnimator.RESTART);
        mPlaneAnimator.setRepeatCount(ValueAnimator.INFINITE);

        switch (mAnimationType)
        {
            case LINEAR:
                mPlaneAnimator.setInterpolator(new LinearInterpolator());
                break;
            case ANTICIPATE:
                mPlaneAnimator.setInterpolator(new AnticipateInterpolator());
                break;
            case ANTICIPATE_OVERSHOOT:
                mPlaneAnimator.setInterpolator(new AnticipateOvershootInterpolator());
                break;
            case ACCELERATE:
                mPlaneAnimator.setInterpolator(new AccelerateInterpolator());
                break;
            case ACCELERATE_DECELERATE:
                mPlaneAnimator.setInterpolator(new AccelerateDecelerateInterpolator());
                break;
            case BOUNCE:
                mPlaneAnimator.setInterpolator(new BounceInterpolator());
                break;
            case DECELERATE:
                mPlaneAnimator.setInterpolator(new DecelerateInterpolator());
                break;
            case FASTOUTLINEARIN:
                mPlaneAnimator.setInterpolator(new FastOutLinearInInterpolator());
                break;
            case FASTOUTSLOWIN:
                mPlaneAnimator.setInterpolator(new FastOutSlowInInterpolator());
                break;
            case LINEAROUTSLOWIN:
                mPlaneAnimator.setInterpolator(new LinearOutSlowInInterpolator());
                break;
            case OVERSHOOT:
                mPlaneAnimator.setInterpolator(new OvershootInterpolator());
                break;
        }

        mPlaneAnimator.start();

        /**
         * The coordinates position calculated by percentage of button side.
         */
        a = new Point((mButtonSide * 10) / 100, (mButtonSide * 55) / 100); // Point a : (10% of mButtonSide, 55% of mButtonSide)
        b = new Point((mButtonSide * 80) / 100, (mButtonSide * 20) / 100); // Point b : (80% of mButtonSide, 20% of mButtonSide)
        c = new Point((mButtonSide * 45) / 100, (mButtonSide * 90) / 100); // Point c : (45% of mButtonSide, 90% of mButtonSide)
        d = new Point((mButtonSide * 30) / 100, (mButtonSide * 70) / 100); // Point d : (30% of mButtonSide, 70% of mButtonSide)
        e = new Point(mButtonSide / 2, mButtonSide / 2); // Point e : (10% of mButtonSide, 55% of mButtonSide)

    }

76-139,给画笔着色，然后选定插值器模式（就是突然加速啊，缓慢啊。一系列模式这个我之前View的文章里有，传送门：http://blog.csdn.net/ddwhan0123/article/details/50464283）

再一个就是计算各个坐标点，画圆画三角都用的。（算法这部分不研究了。反正就是依据控件大小操作）

public void setPath()
    {
        mPlanePath = new Path();

        mPlanePath.moveTo(a.x, a.y); //Set the starting point to A
        mPlanePath.lineTo(a.x, a.y);
        mPlanePath.lineTo(b.x, b.y);
        mPlanePath.lineTo(c.x, c.y);
        mPlanePath.lineTo(d.x, d.y);
        mPlanePath.lineTo(e.x, e.y);
        mPlanePath.lineTo(d.x, d.y);
        mPlanePath.lineTo(a.x, a.y);
    }

164-174，画轨迹用的

private void translate()
    {
        a.set((mButtonSide * 10) / 100, (mButtonSide * 55) / 100); // Point a : (10% of mButtonSide,
        // 55% of mButtonSide)
        b.set((mButtonSide * 80) / 100, (mButtonSide * 20) / 100); // Point b : (80% of mButtonSide,
        // 20% of mButtonSide)
        c.set((mButtonSide * 45) / 100, (mButtonSide * 90) / 100); // Point c : (45% of mButtonSide,
        // 90% of mButtonSide)
        d.set((mButtonSide * 30) / 100, (mButtonSide * 70) / 100); // Point d : (30% of mButtonSide,
        // 70% of mButtonSide)
        e.set(mButtonSide / 2, mButtonSide / 2); // Point e : (10% of mButtonSide, 55% of
        // mButtonSide)


        int change = 3 * (int) mPlaneAnimator.getAnimatedValue();

        Log.i(LOGTAG, "Animated Value: " + change + ", Flag: " + flag++);

        a.x += change;
        a.y -= change;
        b.x += change;
        b.y -= change;
        c.x += change;
        c.y -= change;
        d.x += change;
        d.y -= change;
        e.x += change;
        e.y -= change;

        invalidate();

    }

178-209，画三角用的，这个三角有一个内凹的角度问题，计算起来还是有点搞脑子了（算法差，心酸）

    private enum AnimationType
    {
        LINEAR,
        ANTICIPATE,
        ANTICIPATE_OVERSHOOT,
        ACCELERATE,
        ACCELERATE_DECELERATE,
        BOUNCE,
        DECELERATE,
        FASTOUTLINEARIN,
        FASTOUTSLOWIN,
        LINEAROUTSLOWIN,
        OVERSHOOT
    }

211-224，各类插值器做的枚举

@Override
    protected void onDraw(Canvas canvas)
    {
        super.onDraw(canvas);
        mBackgroundPaint.setAlpha(255);
        mOutlinePath.addRoundRect(new RectF(0, 0, mButtonSide, mButtonSide),
                mButtonSide / 3, mButtonSide / 3, Path.Direction.CCW);
        canvas.drawPath(mOutlinePath, mBackgroundPaint);
        canvas.clipPath(mOutlinePath);
        // for different color of Fill and Stroke,
        // first painted in Fill style and then Stroke style with different color
        mPlanePaint.setStyle(Paint.Style.FILL);
        mPlanePaint.setColor(mPlaneColor);
        mPlanePaint.setAlpha(255 - ((int) mPlaneAnimator.getAnimatedValue() * 25) / 10);
        translate();
        setPath();
        canvas.drawPath(mPlanePath, mPlanePaint);
        mPlanePaint.setStyle(Paint.Style.STROKE);
        mPlanePaint.setColor(Color.WHITE);
        mPlanePaint.setAlpha(255 - ((int) mPlaneAnimator.getAnimatedValue() * 25) / 10);
        canvas.drawPath(mPlanePath, mPlanePaint);
    }

142-162,详细的绘画实现，这部分来读一读

首先给画笔做了一些圆角的操作。然后画方，画圆。然后用Direction去掉不须要的部分。出现了我们的外圈白线

再之后就是画三角。画三角也是依据位置和动画位置一直在刷UI的。

所以 这控件持续时间多了，可能会有卡顿的现象。。

背景啊，大小啊，三角颜色这些都能够改。可是要在XML里改，作者没有提供一系列set方法。

OK，就到这。明天我休假了。家里有点事可能停更，之后放假在家没事做的时候再补吧，新年快乐。！

！！