直播商城系统源码，自定义View实现方向控制控件，可拖拽中间圆

public class DirectionView extends View implements View.OnTouchListener {<br>    private int width;<br>    private int height;<br>    private int halfWidth;<br>    private int halfHeight;<br>    private int smallCircleRadius;<br> <br>    private int sideWidth = 4;//外层边框宽度<br> <br>    private Paint paintCircleSide;<br>    private Paint paintCircleBg;<br>    private Paint paintCircleCenter;<br>    private Paint paintDirection;<br> <br>    private int pressDirectionH = 0;<br>    private int pressDirectionV = 0;<br> <br>    private int smallCircleCenterX = -1;<br>    private int smallCircleCenterY = -1;<br>    private int halfTouchWidth = 65;<br> <br>    private BlurMaskFilter blurMaskFilter;<br>    private Path path = new Path();<br> <br>    public DirectionView(Context context) {<br>        super(context);<br>        init(context);<br>    }<br> <br>    public DirectionView(Context context, @Nullable AttributeSet attrs) {<br>        super(context, attrs);<br>        init(context);<br>    }<br> <br>    public DirectionView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {<br>        super(context, attrs, defStyleAttr);<br>        init(context);<br>    }<br> <br>    private void init(Context context)<br>    {<br>        paintCircleSide = createPaintWithCommon(sideWidth, "#66ffffff", Paint.Style.STROKE);<br>        paintCircleBg = createPaintWithCommon(2, "#662a3845", Paint.Style.FILL);<br>        paintCircleCenter = createPaintWithCommon(2, "#ffffff", Paint.Style.FILL);<br>        paintDirection = createPaintWithCommon(6, "#ffffff", Paint.Style.STROKE);<br> <br>        blurMaskFilter = new BlurMaskFilter(20, BlurMaskFilter.Blur.SOLID);<br> <br>        this.setOnTouchListener(this);<br>    }<br> <br>    private Paint createPaintWithCommon(int strokeWidth, String color, Paint.Style style)<br>    {<br>        Paint paint = new Paint();<br>        paint.setStrokeWidth(strokeWidth);<br>        paint.setColor(Color.parseColor(color));<br>        paint.setStyle(style);<br>        paint.setAntiAlias(true);<br>        paint.setStrokeJoin(Paint.Join.ROUND);<br>        paint.setStrokeCap(Paint.Cap.ROUND);<br>        return paint;<br>    }<br> <br>    @Override<br>    protected void onDraw(Canvas canvas) {<br>        super.onDraw(canvas);<br> <br>        canvas.drawCircle(halfWidth, halfHeight, halfWidth - sideWidth / 2, paintCircleBg);<br>        canvas.drawCircle(halfWidth, halfHeight, halfWidth - sideWidth, paintCircleSide);<br> <br>        if(this.smallCircleCenterY != -1)<br>        {<br>//            paintCircleCenter.setMaskFilter(blurMaskFilter);<br>            canvas.drawCircle(smallCircleCenterX, smallCircleCenterY, smallCircleRadius, paintCircleCenter);<br>        }<br>        else<br>        {<br>//            paintCircleCenter.setMaskFilter(null);<br>            canvas.drawCircle(halfWidth, halfHeight, smallCircleRadius, paintCircleCenter);<br>        }<br> <br>        int offsetSize = 25;<br>        int offsetPosition = 20;<br> <br>        //上<br>        if(pressDirectionV == PtzAction.Direction.Up)<br>            paintDirection.setColor(Color.parseColor("#0000ff"));<br>        else<br>            paintDirection.setColor(Color.parseColor("#ffffff"));<br> <br>        path.reset();<br>        path.moveTo(halfWidth - offsetSize, halfHeight / 2 - offsetPosition);<br>        path.lineTo(halfWidth, halfHeight / 2 - offsetSize - offsetPosition);<br>        path.lineTo(halfWidth + offsetSize, halfHeight / 2 - offsetPosition);<br>        canvas.drawPath(path, paintDirection);<br> <br>        //右<br>        if(pressDirectionH == PtzAction.Direction.Right)<br>            paintDirection.setColor(Color.parseColor("#0000ff"));<br>        else<br>            paintDirection.setColor(Color.parseColor("#ffffff"));<br> <br>        path.reset();<br>        path.moveTo(halfWidth + halfWidth / 2 + offsetPosition, halfHeight - offsetSize);<br>        path.lineTo(halfWidth + halfWidth / 2 + offsetPosition + offsetSize, halfHeight);<br>        path.lineTo(halfWidth + halfWidth / 2 + offsetPosition, halfHeight + offsetSize);<br>        canvas.drawPath(path, paintDirection);<br> <br>        //下<br>        if(pressDirectionV == PtzAction.Direction.Down)<br>            paintDirection.setColor(Color.parseColor("#0000ff"));<br>        else<br>            paintDirection.setColor(Color.parseColor("#ffffff"));<br> <br>        path.reset();<br>        path.moveTo(halfWidth - offsetSize, halfHeight + halfHeight / 2 + offsetPosition);<br>        path.lineTo(halfWidth, halfHeight + halfHeight / 2 + offsetSize + offsetPosition);<br>        path.lineTo(halfWidth + offsetSize, halfHeight + halfHeight / 2 + offsetPosition);<br>        canvas.drawPath(path, paintDirection);<br> <br>        //左<br>        if(pressDirectionH == PtzAction.Direction.Left)<br>            paintDirection.setColor(Color.parseColor("#0000ff"));<br>        else<br>            paintDirection.setColor(Color.parseColor("#ffffff"));<br> <br>        path.reset();<br>        path.moveTo(halfWidth / 2 - offsetPosition, halfHeight - offsetSize);<br>        path.lineTo(halfWidth / 2 - offsetPosition - offsetSize, halfHeight);<br>        path.lineTo(halfWidth / 2 - offsetPosition, halfHeight + offsetSize);<br>        canvas.drawPath(path, paintDirection);<br>    }