Android自定义View：9宫格图形手势解锁
效果图
话不多说，上效果图。
9宫格图形解锁的实现
点
9宫格图形解锁的操作就是在9个点上进行的，所以我们先定义一个点类，该类主要用于存储点的信息：坐标，状态，位置。
public class Point {
//正常状态
public static int STATE_NORMAL = 0;
//选中状态
public static int STATE_PRESSED = 1;
//错误状态
public static int STATE_ERROR = 2;
public float x, y;
public int index = 0, status = 0;
public Point() {
}
public Point(float x, float y) {
this.x = x;
this.y = y;
}
}
自定义的View
- View的初始化先绘制9个点，点有三个状态正常，选中，错误，对应的图片资源可自由更改。并创建二维数组存储9个点的位置。
- onTouchEvent事件中，监听DOWN,MOVE,UP三个状态，判断起始点是否在9个点上，然后判断触摸移动过程中经过哪些点，是否重复，记录到List中。
- 触摸过程中使用postInvalidate()刷新View，根据List中的点绘制点与点之间的连线。
- 触摸结束后，根据点的位置，判读点的个数是否足够，密码是否正确等，使用handler发送消息postInvalidate()刷新View，重新绘制点和线的样式，返回回调结果。
ps：mPassword变量为图形解锁的密码，需要提前赋值，默认为null。
public class GraphicLockView extends View {
/**
* 图形解锁的密码
* 解锁前，请给该变量赋值为你的密码
*/
public static String mPassword;
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) {
//初始化，只执行一次即可
if (!isInit) {
//初始化点
initPoints();
}
//绘制——将点绘制到画布上
pointToCanvas(canvas);
//绘制刷新时，根据点绘制连线
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.根据屏幕尺寸，计算偏移量
width = getWidth();
height = getHeight();
if (width > height) { //横屏
//横屏时只有x坐标有偏移量
offsetsX = (width - height) / 2;
width = height;
} else { //竖屏
//竖屏时只有y坐标有偏移量
offsetsY = (height - width) / 2;
height = width;
}
//2。指定资源文件
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);
//3.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);
//4.计算图片资源的半径
bitmapR = bpPointNormal.getWidth() / 2;
//5.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();
//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 && onGraphicLockListener != null) {
//绘制不成立
if (selectPointList.size() == 1) {
resetPoint();
} else if (selectPointList.size() < MIN_POINT && selectPointList.size() > 0) { //绘制错误,点不够
onGraphicLockListener.LockShort();
errorPoint();
} else if (selectPointList.size() >= MIN_POINT) {//绘制成功
StringBuilder strPassword = new StringBuilder();
for (Point pwdPoint : selectPointList) {
strPassword.append(pwdPoint.index);
}
if (TextUtils.isEmpty(mPassword)) {
onGraphicLockListener.LockSuccess(0, strPassword.toString());
correctPoint();
} else {
if (mPassword.equals(strPassword.toString())) {
onGraphicLockListener.LockSuccess(1, strPassword.toString());
correctPoint();
} else {
onGraphicLockListener.LockFailure();
errorPoint();
}
}
}
}
//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) {
return selectPointList.contains(point);
}
/**
* 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(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
handler.sendEmptyMessage(0x001);
}
}).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(0x001);
}
}).start();
}
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == 0x001) {
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 (LockUtil.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) LockUtil.twoPointDistance(startPoint, endPoint);
float degree = LockUtil.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 if (startPoint.status == Point.STATE_ERROR) {//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 LockSuccess(int what, String password);//what=0设置密码成功回调；what=1解锁成功回调
void LockFailure();//解锁失败的回调
void LockShort();//密码太短的回调
}
}
View中使用的方法
public class LockUtil {
/**
* 两点之间的距离
*
* @param a 第一个点
* @param b 第二个点
* @return 距离
*/
public static double twoPointDistance(Point a, Point b) {
//x轴差的平方加上y轴的平方,然后取平方根
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));
}
/**
* 判断手指移动的坐标与点的坐标是否重合(默认小于点半径的一半的时候表示重合)
*
* @param pointX 点横坐标
* @param pointY 点纵坐标
* @param r 点半径
* @param moveX 手指移动的横坐标
* @param moveY 手指移动的纵坐标
* @return
*/
public static boolean isCoincide(float pointX, float pointY, float r, float moveX, float moveY) {
return Math.sqrt((pointX - moveX) * (pointX - moveX) + (pointY - moveY) * (pointY - moveY)) < r;
}
/**
* 获取角度
*
* @param pointA 第一个点
* @param pointB 第二个点
* @return
*/
public static float getDegrees(Point pointA, Point pointB) {
return (float) Math.toDegrees(Math.atan2(pointB.y - pointA.y, pointB.x - pointA.x));
}
}
设置图形密码
初始的图形密码为null，将第一次绘制成功的图形密码赋值给GraphicLockView.mPassword，作为再次绘制验证的初始密码。再次绘制成功后，使用SharedPreferences存储图形密码。
public class SettingActivity extends AppCompatActivity {
private GraphicLockView graphicLockView;
private TextView text;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_setting);
text = findViewById(R.id.tv_text);
text.setText("绘制解锁图案");
graphicLockView = findViewById(R.id.lock_view);
graphicLockView.setOnGraphicLockListener(new GraphicLockView.OnGraphicLockListener() {
@Override
public void LockSuccess(int what, String password) {
if (what == 0) {
GraphicLockView.mPassword = password;
text.setText("再次绘制解锁图案");
} else {
SPUtil.put(SettingActivity.this, "PASSWORD", password);
SettingActivity.this.finish();
}
}
@Override
public void LockFailure() {
text.setText("与上次绘制的不一致");
}
@Override
public void LockShort() {
text.setText("最少连接4个点");
}
});
}
}
解锁图形密码
图形密码设置成功后，该密码就是下次解锁的密码。根据回调结果做判断，进行相应的逻辑处理即可。
public class UnlockActivity extends AppCompatActivity {
private GraphicLockView graphicLockView;
private TextView text;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_setting);
text = findViewById(R.id.tv_text);
text.setText("请输入手势密码");
graphicLockView = findViewById(R.id.lock_view);
graphicLockView.setOnGraphicLockListener(new GraphicLockView.OnGraphicLockListener() {
@Override
public void LockSuccess(int what, String password) {
text.setText("解锁成功");
}
@Override
public void LockFailure() {
text.setText("密码错误");
}
@Override
public void LockShort() {
text.setText("最少连接4个点");
}
});
}
}
重置密码
清除SharedPreferences中密码对应的key或者直接将密码的key赋值为空，即可。
参考
https://www.jianshu.com/p/85315f428222
项目地址
https://github.com/MyAndroidDemo/GraphicUnlock