Android实现九宫格图案解锁，自带将图案转化成数字密码的功能，代码如下：

LockPatternView.java

package com.jackie.lockpattern; import android.content.Context; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Point; import android.text.TextUtils; import android.util.AttributeSet; import android.util.TypedValue; import android.view.MotionEvent; import android.view.View; import java.util.ArrayList; import java.util.List; /** * Created by Jackie on 2015/12/24. * 图案解锁 */ public class LockPatternView extends View { /** * 圆的画笔 */ private Paint mCirclePaint; /** * 线的画笔 */ private Paint mLinePaint; /** * 圆心数组 */ private PointView[][] mPointViewArray = new PointView[3][3]; /** * 保存选中点的集合 */ private List<PointView> mSelectedPointViewList; /** * 解锁图案的边长 */ private int mPatternWidth; /** * 图案监听器 */ private OnPatternChangeListener mOnPatternChangeListener; /** * 半径 */ private float mRadius; /** * 每个圆圈的下标 */ private int mIndex = 1; /** * 第一个点是否选中 */ private boolean mIsSelected; /** * 是否绘制结束 */ private boolean mIsFinished; /** * 正在滑动并且没有任何点选中 */ private boolean mIsMovingWithoutCircle = false; private float mCurrentX, mCurrentY; /** * 正常状态的颜色 */ private static final int NORMAL_COLOR = 0xFF70DBDB; /** * 选中状态的颜色 */ private static final int SELECTED_COLOR = 0xFF979797; public LockPatternView(Context context) { this(context, null); } public LockPatternView(Context context, AttributeSet attrs) { super(context, attrs); mCirclePaint = new Paint(); mCirclePaint.setAntiAlias(true); mCirclePaint.setDither(true); mCirclePaint.setColor(NORMAL_COLOR); mCirclePaint.setStyle(Paint.Style.FILL); mLinePaint = new Paint(); mLinePaint.setAntiAlias(true); mLinePaint.setDither(true); mLinePaint.setStrokeWidth(20); mLinePaint.setColor(SELECTED_COLOR); mLinePaint.setStyle(Paint.Style.STROKE); mRadius = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, getResources().getDisplayMetrics()); mSelectedPointViewList = new ArrayList<>(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); //取屏幕长和宽中的较小值作为图案的边长 mPatternWidth = Math.min(getMeasuredWidth(), getMeasuredHeight()); setMeasuredDimension(mPatternWidth, mPatternWidth); } @Override protected void onDraw(Canvas canvas) { //画圆 drawCircle(canvas); //将选中的圆重新绘制一遍，将选中的点和未选中的点区别开来 for (PointView pointView : mSelectedPointViewList) { mCirclePaint.setColor(SELECTED_COLOR); canvas.drawCircle(pointView.x, pointView.y, mRadius, mCirclePaint); mCirclePaint.setColor(NORMAL_COLOR); //每重新绘制一个,将画笔的颜色重置,保证不会影响其他圆的绘制 } //点与点画线 if (mSelectedPointViewList.size() > 0) { Point pointViewA = mSelectedPointViewList.get(0); //第一个选中的点为A点 for (int i = 0; i < mSelectedPointViewList.size(); i++) { Point pointViewB = mSelectedPointViewList.get(i); //其他依次遍历出来的点为B点 drawLine(canvas, pointViewA, pointViewB); pointViewA = pointViewB; } //点与鼠标当前位置绘制轨迹 if (mIsMovingWithoutCircle & !mIsFinished) { drawLine(canvas, pointViewA, new PointView((int)mCurrentX, (int)mCurrentY)); } } super.onDraw(canvas); } /** * 画圆 * @param canvas 画布 */ private void drawCircle(Canvas canvas) { //初始化点的位置 for (int i = 0; i < mPointViewArray.length; i++) { for (int j = 0; j < mPointViewArray.length; j++) { //圆心的坐标 int cx = mPatternWidth / 4 * (j + 1); int cy = mPatternWidth / 4 * (i + 1); //将圆心放在一个点数组中 PointView pointView = new PointView(cx, cy); pointView.setIndex(mIndex); mPointViewArray[i][j] = pointView; canvas.drawCircle(cx, cy, mRadius, mCirclePaint); mIndex++; } } mIndex = 1; } /** * 画线 * @param canvas 画布 * @param pointA 第一个点 * @param pointB 第二个点 */ private void drawLine(Canvas canvas, Point pointA, Point pointB) { canvas.drawLine(pointA.x, pointA.y, pointB.x, pointB.y, mLinePaint); } @Override public boolean onTouchEvent(MotionEvent event) { mCurrentX = event.getX(); mCurrentY = event.getY(); PointView selectedPointView = null; switch(event.getAction()) { case MotionEvent.ACTION_DOWN: //重新绘制 if (mOnPatternChangeListener != null) { mOnPatternChangeListener.onPatternStarted(true); } mSelectedPointViewList.clear(); mIsFinished = false; selectedPointView = checkSelectPoint(); if (selectedPointView != null) { //第一次按下的位置在圆内，被选中 mIsSelected = true; } break; case MotionEvent.ACTION_MOVE: if (mIsSelected) { selectedPointView = checkSelectPoint(); } if (selectedPointView == null) { mIsMovingWithoutCircle = true; } break; case MotionEvent.ACTION_UP: mIsFinished = true; mIsSelected = false; break; } //将选中的点收集起来 if (!mIsFinished && mIsSelected && selectedPointView != null) { if (!mSelectedPointViewList.contains(selectedPointView)) { mSelectedPointViewList.add(selectedPointView); } } if (mIsFinished) { if (mSelectedPointViewList.size() == 1) { mSelectedPointViewList.clear(); } else if (mSelectedPointViewList.size() < 5 && mSelectedPointViewList.size() > 0) { //绘制错误 if (mOnPatternChangeListener != null) { mOnPatternChangeListener.onPatternChange(null); } } else { //绘制成功 String patternPassword = ""; if (mOnPatternChangeListener != null) { for (PointView pointView : mSelectedPointViewList) { patternPassword += pointView.getIndex(); } if (!TextUtils.isEmpty(patternPassword)) { mOnPatternChangeListener.onPatternChange(patternPassword); } } } } invalidate(); return true; } /** * 判断当前按下的位置是否在圆心数组中 * @return 返回选中的点 */ private PointView checkSelectPoint() { for (int i = 0; i < mPointViewArray.length; i++) { for (int j = 0; j < mPointViewArray.length; j++) { PointView pointView = mPointViewArray[i][j]; if (isWithinCircle(mCurrentX, mCurrentY, pointView.x, pointView.y, mRadius)) { return pointView; } } } return null; } /** * 判断点是否在圆内 * @param x 点X轴坐标 * @param y 点Y轴坐标 * @param cx 圆心X坐标 * @param cy 圆心Y坐标 * @param radius 半径 * @return true表示在圆内，false表示在圆外 */ private boolean isWithinCircle(float x, float y, float cx, float cy, float radius) { //如果点和圆心的距离小于半径，则证明点在圆内 if (Math.sqrt(Math.pow(x - cx, 2) + Math.pow(y- cy, 2)) <= radius) { return true; } return false; } /** * 设置图案监听器 */ public void setOnPatternChangeListener(OnPatternChangeListener onPatternChangeListener) { if (onPatternChangeListener != null) { this.mOnPatternChangeListener = onPatternChangeListener; } } /** * 图案监听器 */ public interface OnPatternChangeListener { /** * 图案改变 * @param patternPassword 图案密码 */ void onPatternChange(String patternPassword); /** * 图案是否重新绘制 * @param isStarted 重新绘制 */ void onPatternStarted(boolean isStarted); } }