<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 xmlns:tools="http://schemas.android.com/tools" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent" 
 android:orientation="vertical" 
 tools:context=".MainActivity" > 
 
 <TextView 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content" 
 android:gravity="center" 
 android:text="请输入密码" 
 android:id="@+id/text" 
 /> 
 
 <com.example.lockpatterview.LockPatterView 
 android:id="@+id/lock" 
 android:layout_weight="1" 
 android:layout_width="match_parent" 
 android:layout_height="0dp" /> 
 
</LinearLayout> 

package com.example.lockpatterview; 
 
import com.example.lockpatterview.LockPatterView.OnPatterChangeLister; 
 
import android.os.Bundle; 
import android.text.TextUtils; 
import android.widget.TextView; 
import android.widget.Toast; 
import android.app.Activity; 
 
public class MainActivity extends Activity implements OnPatterChangeLister { 
 
 LockPatterView lock; 
 TextView text; 
 String p = "14789"; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 text = (TextView) findViewById(R.id.text); 
 lock = (LockPatterView) findViewById(R.id.lock); 
 lock.SetOnPatterChangeLister(this); 
 } 
 
 @Override 
 public void onPatterChange(String passwordStr) { 
 if (!TextUtils.isEmpty(passwordStr)) { 
  if (passwordStr.equals(p)) { 
  text.setText(passwordStr); 
  } else { 
  text.setText("密码错误"); 
  lock.errorPoint(); 
  } 
 }else { 
  Toast.makeText(MainActivity.this, "至少连接5点", 0).show(); 
 } 
 
 } 
 
 @Override 
 public void onPatterStart(boolean isStart) { 
 if (isStart) { 
  text.setText("请绘制图案"); 
 } 
 } 
 
} 

package com.example.lockpatterview; 
 
import java.util.ArrayList; 
import java.util.List; 
 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Canvas; 
import android.graphics.Matrix; 
import android.graphics.Paint; 
import android.text.TextUtils; 
import android.util.AttributeSet; 
import android.view.MotionEvent; 
import android.view.View; 
 
public class LockPatterView extends View { 
 
 private static final int POINT_SIZE = 5; 
 
 private Point[][] points = new Point[3][3]; 
 
 private Matrix matrix = new Matrix(); 
 
 private float width, height, 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<LockPatterView.Point>(); 
 
 private OnPatterChangeLister onPatterChangeLister; 
 
 /** 
 * 构造函数 
 */ 
 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); 
 } 
 
 /********************************************************* 
 * 绘制9宫格 
 * movePoint代表鼠标在移动，但是不是9宫格里面的点 
 * isInit是否初始化过9个点 
 * isSelect 点位是否被选中状态 
 * isFinish 是否绘制完毕 
 */ 
 private boolean isInit, isSelect, isFinish, movePoint; 
 
 @Override 
 protected void onDraw(Canvas canvas) { 
 // 第一次没有初始化就进行初始化，一旦初始化就不在初始化工作了，isInit的意思是---默认没有初始化过 
 if (!isInit) { 
  // 初始化9个点 
  initPoints(); 
 } 
 // 绘制9个点 
 points2Canvas(canvas); 
 
 if (pointList.size() > 0) { 
  Point a = pointList.get(0); 
  // 绘制九宫格坐标点 
  for (int i = 0; i < pointList.size(); i++) { 
  Point b = pointList.get(i); 
  line2Canvas(canvas, a, b); 
  a = b; 
  } 
  // 绘制鼠标坐标点 
  if (movePoint) { 
  line2Canvas(canvas, a, new Point(moveX, moveY)); 
  } 
 } 
 } 
 
 /** 
 * 初始化9个点位 获取点位的3种状态 线的2种状态 以及9点的坐标位置 以及初始化密码操作 isInit= 
 * true设置状态--下次不必初始化话工作了 
 */ 
 private void initPoints() { 
 
 // 获取布局宽高 
 width = getWidth(); 
 height = getHeight(); 
 
 // 横屏和竖屏 
 
 offstartY = (height - width) / 2; 
 
 // 图片资源 
 bitmap_normal = BitmapFactory.decodeResource(getResources(), 
  R.drawable.btn_circle_normal); 
 bitmap_pressed = BitmapFactory.decodeResource(getResources(), 
  R.drawable.btn_circle_pressed); 
 bitmap_error = BitmapFactory.decodeResource(getResources(), 
  R.drawable.btn_circle_selected); 
 bitmap_line = BitmapFactory.decodeResource(getResources(), 
  R.drawable.ddd); 
 bitmap_line_error = BitmapFactory.decodeResource(getResources(), 
  R.drawable.qqq); 
 
 points[0][0] = new Point(width / 4, offstartY + width / 4); 
 points[0][1] = new Point(width / 2, offstartY + width / 4); 
 points[0][2] = new Point(width / 4 * 3, offstartY + width / 4); 
 
 points[1][0] = new Point(width / 4, offstartY + width / 4 * 2); 
 points[1][1] = new Point(width / 2, offstartY + width / 4 * 2); 
 points[1][2] = new Point(width / 4 * 3, offstartY + width / 4 * 2); 
 
 points[2][0] = new Point(width / 4, offstartY + width / 4 * 3); 
 points[2][1] = new Point(width / 2, offstartY + width / 4 * 3); 
 points[2][2] = new Point(width / 4 * 3, offstartY + width / 4 * 3); 
 
 // 设置密码1--9 
 int index = 1; 
 for (Point[] points : this.points) { 
  for (Point point : points) { 
  point.index = index; 
  index++; 
  } 
 } 
 // 初始化完成 
 isInit = true; 
 } 
 
 /** 
 * 将9个点绘制到画布 循环遍历9个点位， 根据3种不同的状态绘制3种不同的9个点位 
 */ 
 private void points2Canvas(Canvas canvas) { 
 // 循环遍历9个点位 
 for (int i = 0; i < points.length; i++) { 
  // 循环遍历每行的3个点位 
  for (int j = 0; j < points[i].length; j++) { 
  // 获取依次的某个点位 
  Point point = points[i][j]; 
  if (point.state == Point.STATE_PRESSED) { 
   // (Bitmap bitmap, float left, float top, Paint paint) 
   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); 
  } 
  } 
 } 
 } 
 
 /** 
 * 画线 
 */ 
 public void line2Canvas(Canvas canvas, Point a, Point b) { 
 // 线的长度--2点之间的距离 
 float linelength = (float) Point.distance(a, b); 
 // 获取2点之间的角度 
 float degress = getDegrees(a, b); 
 //根据a点进行旋转 
 canvas.rotate(degress, a.x, a.y); 
 
 if (a.state == Point.STATE_PRESSED) { 
  // xy方向上的缩放比例 
  matrix.setScale(linelength / bitmap_line.getWidth(), 1); 
  matrix.postTranslate(a.x - bitmap_line.getWidth() / 2, a.y 
   - bitmap_line.getHeight() / 2); 
  canvas.drawBitmap(bitmap_line, matrix, paint); 
 } else { 
  matrix.setScale(linelength / bitmap_line.getWidth(), 1); 
  matrix.postTranslate(a.x - bitmap_line.getWidth() / 2, a.y 
   - bitmap_line.getHeight() / 2); 
  canvas.drawBitmap(bitmap_line_error, matrix, paint); 
 } 
 //画线完毕回归角度 
 canvas.rotate(-degress, a.x, a.y); 
 } 
 
 // 获取角度 
 public float getDegrees(Point pointA, Point pointB) { 
 return (float) Math.toDegrees(Math.atan2(pointB.y - pointA.y, pointB.x 
  - pointA.x)); 
 } 
 
 /**************************************************************************** 
 * onTouch事件处理 
 */ 
 
 @Override 
 public boolean onTouchEvent(MotionEvent event) { 
 moveX = event.getX(); 
 moveY = event.getY(); 
 
 movePoint = false; 
 isFinish = false; 
 
 Point point = null; 
 
 switch (event.getAction()) { 
 //只要按下操作，就代表重新绘制界面 
 case MotionEvent.ACTION_DOWN: 
  if (onPatterChangeLister != null) { 
  onPatterChangeLister.onPatterStart(true); 
  } 
  // 每次按下，都需要清空之前的集合 
  resetPoint(); 
  // 检测是不是在九宫格内 
  point = chechSelectPoint(); 
  if (point != null) { 
  //如果按下的位置在9宫格内，就改成状态为true 
  isSelect = true; 
  } 
  break; 
 case MotionEvent.ACTION_MOVE: 
  if (isSelect) { 
  // 检测是不是在九宫格内 
  point = chechSelectPoint(); 
  if (point == null) { 
   movePoint = true; 
  } 
  } 
  break; 
 case MotionEvent.ACTION_UP: 
  //绘制完毕，点位状态改为未选中 
  isFinish = true; 
  isSelect = false; 
  break; 
 
 } 
 // 如果没有绘制完毕，如果九宫格处于选中状态 
 if (!isFinish && isSelect && point != null) { 
  // 交叉点 
  if (crossPoint(point)) { 
  movePoint = true; 
  } else {// 新点 
  point.state = Point.STATE_PRESSED; 
  pointList.add(point); 
  } 
 } 
 
 // 绘制结束 
 if (isFinish) { 
  // 绘制不成立 
  if (pointList.size() == 1) { 
  // resetPoint(); 
  errorPoint(); 
  } else if (pointList.size() < POINT_SIZE && pointList.size() > 0) {// 绘制错误 
  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; 
 } 
 
 /** 
 * 重新绘制 
 */ 
 public void resetPoint() { 
 for (int i = 0; i < pointList.size(); i++) { 
  Point point = pointList.get(i); 
  point.state = Point.STATE_NORMAL; 
 } 
 pointList.clear(); 
 } 
 
 /** 
 * 检查是否选中 
 */ 
 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; 
 } 
 
 /** 
 * 交叉点 
 */ 
 private boolean crossPoint(Point point) { 
 if (pointList.contains(point)) { 
  return true; 
 } else { 
  return false; 
 } 
 } 
 
 /** 
 * 绘制错误 
 */ 
 public void errorPoint() { 
 for (Point point : pointList) { 
  point.state = Point.STATE_ERROR; 
 } 
 } 
 
 /*********************************************************************** 
 * 自定义的点 
 */ 
 public static class Point { 
 // 正常 
 public static int STATE_NORMAL = 0; 
 // 选中 
 public static int STATE_PRESSED = 1; 
 // 错误 
 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; 
 } 
 
 /** 
  * 两点之间的距离 
  */ 
 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; 
 } 
 } 
 
 /** 
 * 图案监听器 
 */ 
 public static interface OnPatterChangeLister { 
 void onPatterChange(String passwordStr); 
 
 void onPatterStart(boolean isStart); 
 } 
 
 /** 
 * 设置图案监听器 
 */ 
 public void SetOnPatterChangeLister(OnPatterChangeLister changeLister) { 
 if (changeLister != null) { 
  this.onPatterChangeLister = changeLister; 
 } 
 } 
}