Android 自定义view的简单应用（2）毛玻璃效果

先看效果图

布局文件：

<?xml version="1.0" encoding="utf-8"?>

这里用到了RenderScript

blur.java

public class blur{    private static int width = 0;    private static int height = 0;    public static Bitmap goBlur(Bitmap bitmap,float radius,Context mContext) {        width = bitmap.getWidth();        height = bitmap.getHeight();        Bitmap result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);        //Instantiate a new Renderscript        RenderScript rs = RenderScript.create(mContext);        //Create an Intrinsic Blur Script using the Renderscript        ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));        //Create the Allocations (in/out) with the Renderscript and the in/out bitmaps        Allocation allIn = Allocation.createFromBitmap(rs, bitmap);        Allocation allOut = Allocation.createFromBitmap(rs, result);        //Set the radius of the blur: 0 < radius <= 25        blurScript.setRadius(radius);        //Perform the Renderscript        blurScript.setInput(allIn);        blurScript.forEach(allOut);        //Copy the final bitmap created by the out Allocation to the outBitmap        allOut.copyTo(result);        //After finishing everything, we destroy the Renderscript.        rs.destroy();        return result;    }}

CircleImageView.java

public class CircleImageView extends View implements View.OnTouchListener {    boolean MoveCircle = false;    boolean init = true;    int CircleCenterX = 0;    int CircleCenterY = 0;    int radius = 0;    int[] TouchMove = new int[2];    Bitmap newmap;    public CircleImageView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        this.setOnTouchListener(this);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Bitmap head = BitmapFactory.decodeResource(getResources(), R.drawable.bg);        if(init) {            int width = this.getMeasuredWidth();            int height = this.getMeasuredHeight();            CircleCenterX = width / 2;            CircleCenterY = height / 2;            radius = width / 4;            init = false;            Bitmap tmp = head;            for (int i = 0; i < 10; i++) {                newmap = blur.goBlur(tmp, 25f, getContext());                tmp = newmap;            }        }        if (newmap != null)            canvas.drawBitmap(newmap, 0, 0, new Paint());        Path path = new Path();        path.addCircle(CircleCenterX,CircleCenterY,radius, Path.Direction.CCW);        canvas.clipPath(path);        canvas.drawBitmap(head,0,0,new Paint());    }    @Override    public boolean onTouch(View view, MotionEvent motionEvent) {        if(motionEvent.getAction() == MotionEvent.ACTION_DOWN)        {            MoveCircle = false;            /*            判断按下是否在圆内 计算按下坐标到当前圆心的距离是否大于圆半径             */            int downX = (int) motionEvent.getX();            int downY = (int) motionEvent.getY();            TouchMove[0] = downX;            TouchMove[1] = downY;            int distance = (int) Math.sqrt(Math.pow((downX - CircleCenterX),2) + Math.pow((downY - CircleCenterY),2));            if(distance < radius)            {                MoveCircle = true;            }        }        if(motionEvent.getAction() == MotionEvent.ACTION_MOVE)        {            if(MoveCircle)            {                int X = (int) motionEvent.getX();                int Y = (int) motionEvent.getY();                CircleCenterX = CircleCenterX + X - TouchMove[0];                CircleCenterY = CircleCenterY + Y - TouchMove[1];                TouchMove[0] = CircleCenterX;                TouchMove[1] = CircleCenterY;                invalidate();            }        }        if(motionEvent.getAction() == MotionEvent.ACTION_UP)        {            MoveCircle = false;        }        return false;    }}

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