android九宫格锁屏控件

public class LockView extends View {
    //半径
    private int radius;
    //中心小圆半径
    private int smallRadius;
    //一行个数
    private int column;
    //选中颜色
    private int selectColor;
    //未选中颜色
    private int normalColor;
    //阴影颜色
    private int shaderColor;
    //连线的颜色
    private int lineColor;
    //圆线宽
    private int circleStrokeWidth;
    //连线的线宽
    private int lineStrokeWidth;

    private Paint normalPaint;
    private Paint selectPaint;
    private Paint linePaint;
    private Paint centerPaint;
    private int width;
    //每个圆宽度
    private int everyWidth;
    //是否是选中绘制
    private boolean isSelect;
    //所有圆信息
    private List allCircleList = new ArrayList<>();
    //选中圆的标志
    private List selectList = new ArrayList<>();
    //是否是重置
    private boolean isReSet;
    private LockViewFinishListener lockViewFinishListener;

    public LockView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs);
    }

    public LockViewFinishListener getLockViewFinishListener() {
        return lockViewFinishListener;
    }

    public void setLockViewFinishListener(LockViewFinishListener lockViewFinishListener) {
        this.lockViewFinishListener = lockViewFinishListener;
    }

    private void init(Context context, AttributeSet attrs) {
        TypedArray typedArray = context.obtainStyledAttributes(attrs,R.styleable.LockView);
        radius = typedArray.getInteger(R.styleable.LockView_lock_radius,100);
        smallRadius = typedArray.getInteger(R.styleable.LockView_smallRadius,30);
        column = typedArray.getInteger(R.styleable.LockView_column,3);
        selectColor =typedArray.getColor(R.styleable.LockView_selectColor,Color.RED);
        normalColor = typedArray.getColor(R.styleable.LockView_lock_normalColor,Color.GRAY);
        shaderColor = typedArray.getColor(R.styleable.LockView_shaderColor,Color.argb(80, 0xff, 0x00, 0x00));
        lineColor = typedArray.getColor(R.styleable.LockView_lineColor,Color.RED);
        circleStrokeWidth = typedArray.getInteger(R.styleable.LockView_circleStrokeWidth,5);
        lineStrokeWidth = typedArray.getInteger(R.styleable.LockView_lineStrokeWidth,15);

        normalPaint = new Paint();
        normalPaint.setColor(normalColor);
        normalPaint.setAntiAlias(false);//设置为无锯齿
        normalPaint.setStrokeWidth(circleStrokeWidth);//线宽
        normalPaint.setStyle(Paint.Style.STROKE);

        selectPaint = new Paint();
        selectPaint.setColor(selectColor);
        selectPaint.setAntiAlias(false);
        selectPaint.setStrokeWidth(circleStrokeWidth);
        selectPaint.setStyle(Paint.Style.STROKE);

        centerPaint = new Paint();
        centerPaint.setColor(selectColor);
        centerPaint.setAntiAlias(false);
        centerPaint.setStrokeWidth(radius - smallRadius);
        centerPaint.setStyle(Paint.Style.FILL_AND_STROKE);

        linePaint = new Paint();
        linePaint.setColor(lineColor);
        linePaint.setAntiAlias(false);//设置为无锯齿
        linePaint.setStrokeWidth(lineStrokeWidth);//线宽
        linePaint.setAlpha(150);
        linePaint.setStyle(Paint.Style.STROKE);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        width = measureWidth(widthMeasureSpec);
        setMeasuredDimension(width, width);
        everyWidth = (width - getPaddingLeft() - getPaddingRight()) / column;
        allCircleList.clear();
        for (int i = 0; i < column; i++) {
            for (int j = 0; j < column; j++) {
                float cx = getPaddingLeft() + everyWidth / 2 * (2 * j + 1);
                float cy = getPaddingTop() + everyWidth / 2 * (2 * i + 1);
                Point point = new Point();
                point.cx = cx;
                point.cy = cy;
                allCircleList.add(point);
            }
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        for (int i = 0; i < allCircleList.size(); i++) {
            Point point = allCircleList.get(i);
            canvas.drawCircle(point.cx, point.cy, radius, normalPaint);
        }
        if (isReSet) {//重置
            isReSet = false;
            postInvalidate();
        } else {
            if (isSelect) {
                for (int i = 0; i < selectList.size(); i++) {
                    int index = selectList.get(i);
                    Point point = allCircleList.get(index);
                    canvas.drawCircle(point.cx, point.cy, radius, selectPaint);
                    Shader mShader = new RadialGradient(point.cx, point.cy, smallRadius, new int[]{selectColor, shaderColor},
                            new float[]{0.9f, 1f}, Shader.TileMode.CLAMP);
                    centerPaint.setShader(mShader);
                    canvas.drawCircle(point.cx, point.cy, smallRadius, centerPaint);
                    if (i >= 1) {
                        int lastIndex = selectList.get(i - 1);
                        Point lastPoint = allCircleList.get(lastIndex);
                        canvas.drawLine(lastPoint.cx, lastPoint.cy, point.cx, point.cy, linePaint);
                    }
                }
            }
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                isReSet = true;
                selectList.clear();

                int index = calculateWhich(event.getX(), event.getY());
                if (index != -1) {
                    selectList.add(index);
                    isSelect = true;
                }
                break;
            case MotionEvent.ACTION_MOVE:
                index = calculateWhich(event.getX(), event.getY());
                if (index != -1) {
                    if (!selectList.contains(index)) {
                        selectList.add(index);
                    }
                }
                break;
            case MotionEvent.ACTION_UP:
                if (lockViewFinishListener != null) {
                    StringBuffer result = new StringBuffer();
                    for (int i = 0; i < selectList.size(); i++) {
                        result.append(selectList.get(i));
                    }
                    lockViewFinishListener.onSuccess(result + "");
                }
                break;
        }
        postInvalidate();
        return true;
    }

    /**
     * 计算控件宽高
     *
     * @param widthMeasureSpec
     * @return
     */
    private int measureWidth(int widthMeasureSpec) {
        int result;
        int specSize = MeasureSpec.getSize(widthMeasureSpec);
        int specMode = MeasureSpec.getMode(widthMeasureSpec);
        if (specMode == MeasureSpec.EXACTLY) {
            result = specSize;
        } else {
            result = getPaddingLeft() + getPaddingRight() + radius * 2 * column ;
            if (specMode == MeasureSpec.AT_MOST) {
                result = Math.min(result, specSize);
            }
        }
        return result;
    }

    /**
     * 计算是在哪个圆中
     *
     * @return
     */
    private int calculateWhich(float lx, float ly) {
        for (int i = 0; i < allCircleList.size(); i++) {
            Point point = allCircleList.get(i);
            if (lx > point.cx - radius && lx < point.cx + radius) {
                if (ly > point.cy - radius && ly < point.cy + radius) {
                    return i;
                }
            }
        }
        return -1;
    }

    public interface LockViewFinishListener {
        void onSuccess(String result);
    }

    private class Point {
        private float cx;
        private float cy;
    }

}