Android实现九宫格图案解锁

public class LockPatterView extends View {

    private static final int POINT_SIZE = 5;
    private Point[][] points = new Point[3][3];
    private boolean isInit,isSelect,isFinish,movePoint;
    private Matrix matrix = new Matrix();
    private float width,height,offstartX,offstartY,moveX,moveY;;
    private Bitmap bitmap_pressed,bitmap_nORMal,bitmap_error,bitmap_line,bitmap_line_error;
    private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    private List<Point> pointList = new ArrayList<Point>();
    private OnPatterChangeLister onPatterChangeLister;
    public LockPatterView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public LockPatterView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public LockPatterView(Context context) {
        super(context);
    }

    @Override
    protected void onDraw(canvas canvas) {
        if (!isInit) {
            initPoints();
        }
        points2Canvas(canvas);

        if (pointList.size() > 0) {
            Point a = pointList.get(0);
            for (int i = 0; i < pointList.size(); i++) {
                Point b = pointList.get(i);
                line2Canvas(canvas, a, b);
                a = b;
            }
            if (movePoint) {
                line2Canvas(canvas, a, new Point(moveX, moveY));
            }
        }
    }

    
    private void points2Canvas(Canvas canvas) {
        for (int i = 0; i < points.length; i++) {
            for (int j = 0; j < points[i].length; j++) {
                Point point = points[i][j];
                if (point.state == Point.STATE_PRESSED) {
                    canvas.drawBitmap(bitmap_pressed, point.x - bitmap_normal.getWidth()/2, point.y - bitmap_normal.getHeight() / 2, paint);
                }else if (point.state == Point.STATE_ERROR) {
                    canvas.drawBitmap(bitmap_error, point.x - bitmap_normal.getWidth()/2, point.y - bitmap_normal.getHeight() / 2, paint);
                }else{
                    canvas.drawBitmap(bitmap_normal, point.x - bitmap_normal.getWidth()/2, point.y - bitmap_normal.getHeight() / 2, paint);
                }
            }
        }
    }


    
    public void line2Canvas(Canvas canvas,Point a,Point b){
        float linelength = (float) Point.distance(a, b);
        float degress = getDegrees(a,b);
        canvas.rotate(degress, a.x, a.y);

        if (a.state == Point.STATE_PRESSED) {
            matrix.setScale(linelength / bitmap_line.getWidth(), 1);
            matrix.postTranslate(a.x, a.y);
            canvas.drawBitmap(bitmap_line, matrix, paint);
        }else{
            matrix.setScale(linelength / bitmap_line.getWidth(), 1);
            matrix.postTranslate(a.x, a.y);
            canvas.drawBitmap(bitmap_line_error, matrix, paint);
        }
        canvas.rotate(-degress, a.x, a.y);
    }

    public float getDegrees(Point pointA, Point pointB) {
        return (float) Math.toDegrees(Math.atan2(pointB.y - pointA.y, pointB.x - pointA.x));
    }

    
    private void initPoints() {

        width = getWidth();
        height = getHeight();

        if (width > height) {
            offstartX = (width - height) / 2;
            width = height;
        }else{
            offstartY = (height - width) / 2;
            height = width;
        }

        bitmap_normal = BitmapFactory.decodeResource(getResources(), R.mipmap.normal);
        bitmap_pressed = BitmapFactory.decodeResource(getResources(), R.mipmap.press);
        bitmap_error = BitmapFactory.decodeResource(getResources(), R.mipmap.error);
        bitmap_line = BitmapFactory.decodeResource(getResources(), R.mipmap.line_normal);
        bitmap_line_error = BitmapFactory.decodeResource(getResources(), R.mipmap.line_error);

        points[0][0] = new Point(offstartX + width / 4,offstartY + height / 4);
        points[0][1] = new Point(offstartX + width / 2,offstartY + height / 4);
        points[0][2] = new Point(offstartX + width - width / 4,offstartY + height / 4);

        points[1][0] = new Point(offstartX + width / 4,offstartY + width / 2);
        points[1][1] = new Point(offstartX + width / 2,offstartY + width / 2);
        points[1][2] = new Point(offstartX + width - width / 4,offstartY + width / 2);

        points[2][0] = new Point(offstartX + width / 4,offstartY + width - width / 4);
        points[2][1] = new Point(offstartX + width / 2,offstartY + width - width / 4);
        points[2][2] = new Point(offstartX + width - width / 4,offstartY + width - width / 4);

        isInit = true;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        moveX = event.getX();
        moveY = event.getY();
        movePoint = false;
        isFinish = false;

        Point point = null;

        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
            if (onPatterChangeLister != null) {
                onPatterChangeLister.onPatterStart(true);
            }
            resetPoint();

            point = chechSelectPoint();
            if (point != null) {
                isSelect = true;
            }
            break;
        case MotionEvent.ACTION_MOVE:
            if (isSelect) {
                point = chechSelectPoint();
                if (point == null) {
                    movePoint = true;
                }
            }
            break;
        case MotionEvent.ACTION_UP:
            isFinish = true;
            isSelect = false;
            break;

        }
        if (!isFinish && isSelect && point != null) {
            if (crossPoint(point)) {
                movePoint = true;
            }else{
                point.state = Point.STATE_PRESSED;
                pointList.add(point);
            }
        }

        if (isFinish) {
            if (pointList.size() == 1) {
                errorPoint();
            }else if(pointList.size() < POINT_SIZE && pointList.size() > 0 ){
                 errorPoint();
                 if (onPatterChangeLister != null) {
                        onPatterChangeLister.onPatterChange(null);
                    }
            }else{
                if (onPatterChangeLister != null) {
                    String pass = "";
                    for (int i = 0; i < pointList.size(); i++) {
                        pass = pass + pointList.get(i).index;
                    }
                    if (!TextUtils.isEmpty(pass)) {
                        onPatterChangeLister.onPatterChange(pass);
                    }
                }
            }
        }

        postInvalidate();
        return true;
    }

    
    private boolean crossPoint(Point point){
        if (pointList.contains(point)) {
            return true;
        }else{
            return false;
        }
    }

    
    public void resetPoint(){
        for (int i = 0; i < pointList.size(); i++) {
            Point point = pointList.get(i);
            point.state = Point.STATE_NORMAL;
        }
        pointList.clear();
    }

    
    public void errorPoint(){
        for (Point point : pointList) {
            point.state = Point.STATE_ERROR;
        }
    }

    
    private Point chechSelectPoint(){
        for (int i = 0; i < points.length; i++) {
            for (int j = 0; j < points[i].length; j++) {
                Point point = points[i][j];
                if (Point.with(point.x, point.y, bitmap_normal.getWidth() / 2, moveX, moveY)) {
                    return point;
                }
            }
        }

        return null;
    }

    public static class Point{
        public static int STATE_NORMAL = 0;
        public static int STATE_PRESSED = 1;
        public static int STATE_ERROR = 2;
        public float x,y;
        public int index = 0,state = 0;
        public Point(){};

        public Point(float x,float y){
            this.x = x;
            this.y = y;
        }

        
        public static double distance(Point a,Point b){
            return Math.sqrt(Math.abs(a.x - b.x) * Math.abs(a.x - b.x) + Math.abs(a.y - b.y) * Math.abs(a.y - b.y)) ;
        }

        
        public static boolean with(float paintX,float pointY,float r,float moveX,float moveY){
            return Math.sqrt((paintX - moveX) * (paintX - moveX) + (pointY - moveY) * (pointY - moveY)) < r ;
        }
    }

}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="Http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.newdegree.mylock.LockPatterView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</RelativeLayout>