序言：前两天因为项目的原因，去做了一下仿ios的数字解锁功能，然后写了那篇快给你的app上锁吧(android数字解锁)，后来想到应用中常见的还有另外一种解锁就是绘制图案解锁，这两种解锁的布局看起来是很相似的，而且产生的结果也很相似，但是用户的操作不一样，下面我就给大家来说明一下
话不多说，先上图：
正常状态
正常状态
按下状态
按下状态
抬起错误状态
抬起错误状态
抬起正确状态
抬起正确状态
思路
这里又是一个九宫格布局，布局可以参考上一篇快给你的app上锁吧(android数字解锁)，只不过这里的九宫格上我们画的是图片(bitmap)。onDraw方法中我们需要画两个东西，一个是点，另一个是线，画点我们就不多说了，根据坐标，将圆形图片画上去即可；下面我们来看画线：
1、首先先要获得按下点的集合：
我们可以用集合来保存touch事件中按下的时候是九宫格中的点
2、然后每两个点连成一条线
首先需要判断第一个点的状态是否是正常的（这个是点的属性，可以自定义），正常的话两点之间就连正确的线，错误的话两点之间就连错误的线
布局画好之后我们还需要判断手势，即onTouch事件，按下，移动，抬起。
1、按下：
(1). 清空之前的操作，新一轮的绘制图案开始
(2). 检查当前按下的点与九宫格中的点是否吻合，如果吻合，将判断第一次是否选中九宫格中的点这个标识位置为true
2、移动：
(1). 判断第一次按下是否选中九宫格中的点
(2). 如果第一次选中九宫格中的点，将手指在移动且手指按下的点不是九宫格中的点这个标识位置为true
3、抬起：
(1). 将所有的标识位都还原成初始化
绘制结束：
1、先判断绘制成不成立
2、然后根据绘制的结果向界面发送回调
至此，相关分析就结束了，详细的释义我会在代码中给出：
public class GraphicLockView extends View {
private Point[][] points = new Point[3][3]; //创建一个3行3列的点数组
private boolean isInit; //判断有没有初始化
private boolean isSelect; //判断手指第一次按下屏幕有没有选中点
private boolean isFinishMove; //表示一次完整的图案绘制是否结束
private boolean isMoveButNotPoint; //表示手指在移动,但是并不是九宫格中的点
private float width, height; //屏幕宽高
private static final int MIN_POINT = 4; //最小能构成密码的点数
private float offsetsX, offsetsY; //偏移量(在这里偏移量等于大边减去小边再除以2)
private float bitmapR; //图片资源的半径
private float moveX, moveY; //手势移动的x,y坐标
private Bitmap bpPointNormal, bpPointPressed, bpPointError; //点的三种图片
private Bitmap bpLinePressed, bpLineError; //线的三种图片
private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private List<Point> selectPointList = new ArrayList<>(); //储存按下的点的集合
private Matrix matrix = new Matrix(); //矩阵,用来处理线的缩放
private OnGraphicLockListener onGraphicLockListener; //对外的监听器
public GraphicLockView(Context context) {
super(context);
}
public GraphicLockView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public GraphicLockView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public void setOnGraphicLockListener(OnGraphicLockListener onGraphicLockListener) {
this.onGraphicLockListener = onGraphicLockListener;
}
@Override
protected void onDraw(Canvas canvas) {
//绘制之前要先初始化一下点,所以要先判断有没有初始化过
if (!isInit) {
//初始化点
initPoints();
}
//绘制——将点绘制到画布上
pointToCanvas(canvas);
if (selectPointList.size() > 0) {
Point startPoint = selectPointList.get(0);
//绘制九宫格坐标里的点
for (int i = 0; i < selectPointList.size(); i++) {
Point endPoint = selectPointList.get(i);
lineToCanvas(canvas, startPoint, endPoint);
startPoint = endPoint;
}
//绘制九宫格坐标以外的点
if (isMoveButNotPoint) {
lineToCanvas(canvas, startPoint, new Point(moveX, moveY));
}
}
}
/**
* 初始化点
*/
private void initPoints() {
//1、先拿到画布的宽高(屏幕的宽高)
width = getWidth();
height = getHeight();
/*================================================================================*/
//2、判断横竖屏并且计算偏移量
if (width > height) { //横屏
//横屏时只有x坐标有偏移量
offsetsX = (width - height) / 2;
/**
* 将手机屏幕可以看作是一个正方形(因为九宫格是正方形,在这里比较好计算),以最小边为基准
*/
width = height;
} else { //竖屏
//竖屏时只有y坐标有偏移量
offsetsY = (height - width) / 2;
height = width;
}
/*================================================================================*/
//3、图片资源(图片资源自己加上)
bpPointNormal = BitmapFactory.decodeResource(getResources(), R.drawable.point_normal);
bpPointPressed = BitmapFactory.decodeResource(getResources(), R.drawable.point_pressed);
bpPointError = BitmapFactory.decodeResource(getResources(), R.drawable.point_error);
bpLinePressed = BitmapFactory.decodeResource(getResources(), R.drawable.line_pressed);
bpLineError = BitmapFactory.decodeResource(getResources(), R.drawable.line_error);
/*================================================================================*/
//4、点的坐标
//第一排
points[0][0] = new Point(offsetsX + width / 4, offsetsY + height / 4);
points[0][1] = new Point(offsetsX + width / 2, offsetsY + height / 4);
points[0][2] = new Point(offsetsX + width - width / 4, offsetsY + height / 4);
//第二排
points[1][0] = new Point(offsetsX + width / 4, offsetsY + height / 2);
points[1][1] = new Point(offsetsX + width / 2, offsetsY + height / 2);
points[1][2] = new Point(offsetsX + width - width / 4, offsetsY + height / 2);
//第三排
points[2][0] = new Point(offsetsX + width / 4, offsetsY + height - height / 4);
points[2][1] = new Point(offsetsX + width / 2, offsetsY + height - height / 4);
points[2][2] = new Point(offsetsX + width - width / 4, offsetsY + height - height / 4);
/*================================================================================*/
//5、计算图片资源的半径
bitmapR = bpPointNormal.getWidth() / 2;
/*================================================================================*/
//6、设置密码按键,初始化每个点,设置为1——9
int index = 1;
for (int i = 0; i < points.length; i++) {
for (int j = 0; j < points[i].length; j++) {
points[i][j].index = index;
index++;
}
}
/*================================================================================*/
//初始化完成
isInit = true;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
moveX = event.getX();
moveY = event.getY();
isFinishMove = false;
isMoveButNotPoint = false;
Point point = null;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
//每次手指按下的时候都表示重新绘制图案
resetPoint();
//1、检查当前按下的点与九宫格中的九个点是否吻合
point = checkSelectPoint();
if (point != null) {
isSelect = true;
}
break;
case MotionEvent.ACTION_MOVE:
if (isSelect) {
point = checkSelectPoint();
if (point == null) {
isMoveButNotPoint = true;
}
}
break;
case MotionEvent.ACTION_UP:
isFinishMove = true;
isSelect = false;
break;
}
//选中重复检查
if (!isFinishMove && isSelect && point != null) {
if (checkCrossPoint(point)) { //交叉点
isMoveButNotPoint = true;
} else { //非交叉点(新的点)
point.status = Point.STATE_PRESSED;
selectPointList.add(point);
}
}
//绘制结束
if (isFinishMove) {
//绘制不成立
if (selectPointList.size() == 1) {
resetPoint();
//绘制错误,点不够
} else if (selectPointList.size() < MIN_POINT && selectPointList.size() > 0) {
if (null != onGraphicLockListener) {
onGraphicLockListener.setPwdFailure();
}
errorPoint();
//绘制成功
} else {
if (null != onGraphicLockListener) {
String strPassword = "";
for (Point pwdPoint : selectPointList) {
strPassword += pwdPoint.index;
}
if (!TextUtils.isEmpty(strPassword)) {
onGraphicLockListener.setPwdSuccess(strPassword);
}
correctPoint();
}
}
}
//刷新view,会调用onDraw方法
postInvalidate();
return true;
}
/**
* 检查交叉点
*
* @param point 点
* @return 是否交叉
*/
private boolean checkCrossPoint(Point point) {
if (selectPointList.contains(point)) {
return true;
}
return false;
}
/**
* 设置绘制不成立
*/
public void resetPoint() {
//将点的状态还原
for (Point point : selectPointList) {
point.status = Point.STATE_NORMAL;
}
selectPointList.clear();
}
/**
* 设置绘制错误,将点的状态还原
*/
public void errorPoint() {
for (Point point : selectPointList) {
point.status = Point.STATE_ERROR;
}
new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
e.printStackTrace();
}
handler.sendEmptyMessage(0);
}
}).start();
}
/**
* 设置绘制成功,将点的状态还原
*/
private void correctPoint() {
new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
handler.sendEmptyMessage(0);
}
}).start();
}
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
for (Point point : selectPointList) {
point.status = Point.STATE_NORMAL;
}
selectPointList.clear();
postInvalidate();
}
};
private Point checkSelectPoint() {
for (int i = 0; i < points.length; i++) {
for (int j = 0; j < points[i].length; j++) {
Point point = points[i][j];
if (AppUtil.isCoincide(point.x, point.y, bitmapR, moveX, moveY)) {
return point;
}
}
}
return null;
}
/**
* 将点绘制到画布上
*
* @param canvas 画布
*/
private void pointToCanvas(Canvas canvas) {
//遍历点的集合
for (int i = 0; i < points.length; i++) {
for (int j = 0; j < points[i].length; j++) {
Point point = points[i][j];
if (points[i][j].status == Point.STATE_PRESSED) {
canvas.drawBitmap(bpPointPressed, point.x - bitmapR, point.y - bitmapR, mPaint);
} else if (points[i][j].status == Point.STATE_ERROR) {
canvas.drawBitmap(bpPointError, point.x - bitmapR, point.y - bitmapR, mPaint);
} else {
canvas.drawBitmap(bpPointNormal, point.x - bitmapR, point.y - bitmapR, mPaint);
}
}
}
}
/**
* 将线绘制到画布上
*
* @param canvas 画布
* @param startPoint 开始的点
* @param endPoint 结束的点
*/
private void lineToCanvas(Canvas canvas, Point startPoint, Point endPoint) {
float lineLength = (float) AppUtil.twoPointDistance(startPoint, endPoint);
float degree = AppUtil.getDegrees(startPoint, endPoint);
canvas.rotate(degree, startPoint.x, startPoint.y); //旋转
if (startPoint.status == Point.STATE_PRESSED) { //按下的状态
//设置线的缩放比例,在这里线是往一个方向缩放的,即x轴,我们只需要设置x轴的缩放比例即可,y轴默认为1
matrix.setScale(lineLength / bpLinePressed.getWidth(), 1);
matrix.postTranslate(startPoint.x - bpLinePressed.getWidth() / 2, startPoint.y - bpLinePressed.getHeight() / 2);
canvas.drawBitmap(bpLinePressed, matrix, mPaint);
} else { //错误的状态
matrix.setScale(lineLength / bpLineError.getWidth(), 1);
matrix.postTranslate(startPoint.x - bpLineError.getWidth() / 2, startPoint.y - bpLineError.getHeight() / 2);
canvas.drawBitmap(bpLineError, matrix, mPaint);
}
canvas.rotate(-degree, startPoint.x, startPoint.y); //把旋转的角度转回来
}
/**
* 图案监听器
*/
public interface OnGraphicLockListener {
void setPwdSuccess(String password);
void setPwdFailure();
}
}
来看一波gif动图：
Github下载地址：传送门
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