[Android实例] 手写签名,画笔颜色选择器

该篇文章从eoeAndroid搬迁过来的,原文地址:[Android实例] 手写签名,画笔颜色选择器

今天没事做,突然想做一下手写签名的东西,然后就开始行动了,然后做了一天,终于完善了Demo。 在这个手写签名demo中,有以下功能:
1.选择画笔的颜色
2.使用橡皮擦
3.清除或重头开始绘制图片
4.上一步或下一步绘制的效果
5.得到当前展示的绘制效果

主要代码:

手写绘制板:

@Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.onDraw(canvas);
        if (isFirst) {
            cacheBitmap = Bitmap.createBitmap(getWidth(), getHeight(),
                    Config.ARGB_8888);
            cacheCanvas = new Canvas(cacheBitmap);
            cacheCanvas.drawColor(Color.WHITE);
            addBitmap();
            isFirst = false;
        }
        canvas.drawBitmap(cacheBitmap, 0, 0, null);
        canvas.drawPath(path, paint);
    }
@Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        int curW = cacheBitmap != null ? cacheBitmap.getWidth() : 0;
        int curH = cacheBitmap != null ? cacheBitmap.getHeight() : 0;
        if (curW >= w && curH >= h) {
            return;
        }
        if (curW < w)
            curW = w;
        if (curH < h)
            curH = h;
        Bitmap newBitmap = Bitmap.createBitmap(curW, curH,
                Bitmap.Config.ARGB_8888);
        Canvas newCanvas = new Canvas();
        newCanvas.setBitmap(newBitmap);
        if (cacheBitmap != null) {
            newCanvas.drawBitmap(cacheBitmap, 0, 0, null);
        }
        cacheBitmap = newBitmap;
        cacheCanvas = newCanvas;
    }
@Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getActionMasked()) {
        case MotionEvent.ACTION_DOWN:
            Log.i("Log", "ACTION_DOWN");
            isClear = false;
            currentX = event.getX(event.getActionIndex());
            currentY = event.getY(event.getActionIndex());
            path.moveTo(currentX, currentY);
            break;
        case MotionEvent.ACTION_MOVE:
            if (isOtherTouch) {
                return true;
            }
            float x = event.getX(event.getActionIndex());
            float y = event.getY(event.getActionIndex());
            path.quadTo(currentX, currentY, x, y);
            currentX = x;
            currentY = y;
            break;
        case MotionEvent.ACTION_UP:
            isOtherTouch = false;
            cacheCanvas.drawPath(path, paint);
            path.reset();
            while (position + 1 < bitmapList.size()) {
                bitmapList.remove(bitmapList.size() - 1);
            }
            addBitmap();
            break;
        case MotionEvent.ACTION_POINTER_DOWN:
            isOtherTouch = true;
            break;
        case MotionEvent.ACTION_POINTER_UP:
            break;

        }
        invalidate();
        return true;
    }

颜色选择器:参照这位童鞋的代码http://www.linuxidc.com/Linux/2012-01/51167.htm

[Android实例] 手写签名,画笔颜色选择器_第1张图片

下载地址:项目代码

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