Android怎么实现九宫格图案解锁

今天小编给大家分享一下Android怎么实现九宫格图案解锁的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。

效果图如下：

第一步

自定义九宫格View。

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 ;        }    }}

第二步

编写布局文件activity_main.xml，在主布局文件中引入自定义的View。

<?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>

最后，运行程序就能看到九宫格图案了。

以上就是“Android怎么实现九宫格图案解锁”这篇文章的所有内容，感谢各位的阅读！相信大家阅读完这篇文章都有很大的收获，小编每天都会为大家更新不同的知识，如果还想学习更多的知识，请关注编程网行业资讯频道。