android– 更改绘画颜色时,现有笔划也会更改

概述参见英文答案>Changingstrokecolorchangespreviousstrokescolor                                    1个我正在使用下面的代码捕获绘图.为了更改笔触颜色或宽度,我调用了setPaintAttribute()方法.但是当我改变颜色时,整个绘图都会改

参见英文答案 > Changing stroke color changes previous strokes color                                    1个
我正在使用下面的代码捕获绘图.为了更改笔触颜色或宽度,我调用了setPaintAttribute()方法.但是当我改变颜色时,整个绘图都会改变,包括我之前绘制的线条.如何更改颜料的颜色并保持以前的图纸不变？我试图创建一个新路径,但之前的绘图消失了.

public voID setPaintAttributes(float stroke_WIDTH, int color)    {        paint=new Paint();        paint.setAntiAlias(true);        paint.setcolor(color);        paint.setStyle(Paint.Style.stroke);        paint.setstrokeJoin(Paint.Join.ROUND);        paint.setstrokeWIDth(stroke_WIDTH);    } public boolean ontouchEvent(MotionEvent event) {        scrollVIEw.requestdisallowIntercepttouchEvent(true);        btnSaveSignature.setEnabled(true);        btnSaveSignature.setBackgroundResource(R.drawable.save);        float eventX = event.getX();        float eventY = event.getY();                   switch (event.getAction()) {        case MotionEvent.ACTION_DOWN:            path.moveto(eventX, eventY);            lasttouchX = eventX;            lasttouchY = eventY;            return true;        case MotionEvent.ACTION_MOVE:        case MotionEvent.ACTION_UP:            resetDirtyRect(eventX, eventY);            int historySize = event.getHistorySize();            for (int i = 0; i < historySize; i++) {                float historicalX = event.getHistoricalX(i);                float historicalY = event.getHistoricalY(i);                path.lineto(historicalX, historicalY);            }            path.lineto(eventX, eventY);            break;        }        invalIDate((int) (dirtyRect.left - HALF_stroke_WIDTH),                (int) (dirtyRect.top - HALF_stroke_WIDTH),                (int) (dirtyRect.right + HALF_stroke_WIDTH),                (int) (dirtyRect.bottom + HALF_stroke_WIDTH));        lasttouchX = eventX;        lasttouchY = eventY;        return true;    }    private voID resetDirtyRect(float eventX, float eventY) {        dirtyRect.left = Math.min(lasttouchX, eventX);        dirtyRect.right = Math.max(lasttouchX, eventX);        dirtyRect.top = Math.min(lasttouchY, eventY);        dirtyRect.bottom = Math.max(lasttouchY, eventY);    }

解决方法:

创建一个包含路径和绘画对的arrayList,然后将每个路径添加到arrayList,它对我有用,

ArrayList<Pair<Path, Paint>> paths = new ArrayList<Pair<Path, Paint>>();

使用方法如下：

    mCanvas = new Canvas();    mPath = new Path();    Paint newPaint = new Paint(mPaint);    paths.add(new Pair<Path, Paint>(mPath, newPaint));

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