Android 图片截取人物头像(仿逗拍)

来源：互联网发布：ogg 中同步表数据变动编辑：程序博客网时间：2024/05/03 09:31

要求

根据给定的头部模板，截取资源图。背景图可支持拖动，缩放，拖动旋转

这里写图片描述

分析

定义剪切浮层，实现背景资源图的操作view

实现

绘制剪切浮层

/**     * 初始化绘制笔     */    private void initRectPaint()    {        mFloatPaint = new Paint();        mFloatPaint.setAlpha(mAlpha);        mFloatPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.XOR));        mEdgePaint = new Paint();        mEdgePaint.setColor(Color.parseColor("#ff000000"));        mEdgePaint.setAlpha(mAlpha);    }@Override    public void draw(Canvas canvas)    {        /** 绘制周围的背景色 **/        drawEdge(canvas);        /** 绘制中间浮层 **/        canvas.drawBitmap(mCropDrawable, mFloatRect.left, mFloatRect.top,                mFloatPaint);    }

操作图层手势

@Override    protected void onDraw(Canvas canvas)    {        canvas.save();        canvas.drawColor(Color.parseColor("#ff1c1c22"));        canvas.drawBitmap(mBGHeadBitmap, mFloatRect.left, mFloatRect.top, null);        canvas.drawBitmap(mBGBitmap, mBGgmatrix, null);        mFloatView.draw(canvas);        canvas.restore();    }//手势操作public boolean onTouchEvent(MotionEvent event)    {        switch (event.getAction() & MotionEvent.ACTION_MASK)        {            case MotionEvent.ACTION_DOWN :                eventMode = EventMode.DRAG;                x_down = event.getX();                y_down = event.getY();                savedMatrix.set(mBGgmatrix);                break;            case MotionEvent.ACTION_POINTER_DOWN :                eventMode = EventMode.ZOOM;                oldDist = spacing(event);                mRotation = rotation(event);                savedMatrix.set(mBGgmatrix);                midPoint(midPoint, event);                break;            case MotionEvent.ACTION_MOVE :                if (eventMode == EventMode.DRAG)                {                    matrix1.set(savedMatrix);                    matrix1.postTranslate(event.getX() - x_down, event.getY()                            - y_down);                    mBGgmatrix.set(matrix1);                    invalidate();                } else if (eventMode == EventMode.ZOOM)                {                    float rotation = rotation(event) - mRotation;                    float newDist = spacing(event);                    float scale = newDist / oldDist;                    /** 缩放 **/                    float values[] = new float[9];                    {                        matrix1.set(savedMatrix);                        matrix1.postScale(scale, scale, midPoint.x, midPoint.y);                    }                    /** 旋转 **/                    matrix1.postRotate(rotation, midPoint.x, midPoint.y);                    mBGgmatrix.set(matrix1);                    invalidate();                }                break;            case MotionEvent.ACTION_UP :            case MotionEvent.ACTION_POINTER_UP :                eventMode = EventMode.NONE;                break;        }        return true;    }

获取剪切图片

        Bitmap tmpBitmap = Bitmap.createBitmap(mScrrenWidth, mScrrenHeight,                Config.ARGB_8888); // 背景图片        Canvas canvas = new Canvas(tmpBitmap); // 新建画布        canvas.drawBitmap(mBGHeadBitmap, mFloatRect.left, mFloatRect.top, null);        canvas.drawBitmap(mBGBitmap, mBGgmatrix, null); // 画图片        canvas.save(Canvas.ALL_SAVE_FLAG); // 保存画布        canvas.restore();        Bitmap ret = Bitmap.createBitmap(tmpBitmap, mFloatRect.left,                mFloatRect.top, mFloatRect.width(), mFloatRect.height(), null,                true);        tmpBitmap.recycle();        tmpBitmap = null;        Bitmap newRet = Bitmap.createBitmap(mFloatRect.width(),                mFloatRect.height(), Config.ARGB_8888);        Canvas canvasHead = new Canvas(newRet);        canvasHead.drawBitmap(ret, 0, 0, null);        Paint paintHead = new Paint();        paintHead.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));        Bitmap crop = BitmapFactory.decodeResource(mContext.getResources(),                R.drawable.headmask);        canvasHead.drawBitmap(crop, 0, 0, paintHead);        return newRet;

效果

这里写图片描述

***基本上我不提供源代码，但是我会尽量用文字把对应的算法描述清楚****因为靠自己的努力和实践写出来的效果才真正是自己的东西如果想要源码Demo，请联系我

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