Android手势锁实现

最终效果如下

整体思路

a、自定义了一个RelativeLayout(GestureLockViewGroup)在里面会根据传入的每行的个数，生成多个GestureLockView（就是上面一个个小圈圈），然后会自动进行布局，里面的宽度，间距，内圆的直径，箭头的大小神马的都是百分比实现的，所以大胆的设置你喜欢的个数，只要你没有密集恐惧症~

b、GestureLockView有三个状态，没有手指触碰、手指触碰、和手指抬起，会根据这三个状态绘制不同的效果，以及抬起时的小箭头需要旋转的角度，会根据用户选择的GestureLockView，进行计算，在GestureLockViewGroup为每个GestureLockView设置

c、GestureLockViewGroup主要就是判断用户ACTION_MOVE，ACTION_DOWN ， ACTION_UP时改变选中的GestureLockView的状态，并且记录下来，提供一定的回调。

自定义属性

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <attr name="color_no_finger_inner_circle" format="color" />
    <attr name="color_no_finger_outer_circle" format="color" />
    <attr name="color_finger_on" format="color" />
    <attr name="color_finger_up" format="color" />
    <attr name="count" format="integer" />
    <attr name="tryTimes" format="integer" />

    <declare-styleable name="GestureLockViewGroup">
        <attr name="color_no_finger_inner_circle" />
        <attr name="color_no_finger_outer_circle" />
        <attr name="color_finger_on" />
        <attr name="color_finger_up" />
        <attr name="count" />
        <attr name="tryTimes" />
    </declare-styleable>

</resources>

GestureLockView

package com.zhy.zhy_gesturelockview.view;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.view.View;

public class GestureLockView extends View
{
    private static final String TAG = "GestureLockView";
    /**
     * GestureLockView的三种状态
     */
    enum Mode
    {
        STATUS_NO_FINGER, STATUS_FINGER_ON, STATUS_FINGER_UP;
    }

    /**
     * GestureLockView的当前状态
     */
    private Mode mCurrentStatus = Mode.STATUS_NO_FINGER;

    /**
     * 宽度
     */
    private int mWidth;
    /**
     * 高度
     */
    private int mHeight;
    /**
     * 外圆半径
     */
    private int mRadius;
    /**
     * 画笔的宽度
     */
    private int mStrokeWidth = 2;

    /**
     * 圆心坐标
     */
    private int mCenterX;
    private int mCenterY;
    private Paint mPaint;

    /**
     * 箭头（小三角最长边的一半长度 = mArrawRate * mWidth / 2 ）
     */
    private float mArrowRate = 0.333f;
    private int mArrowDegree = -1;
    private Path mArrowPath;
    /**
     * 内圆的半径 = mInnerCircleRadiusRate * mRadus
     * 
     */
    private float mInnerCircleRadiusRate = 0.3F;

    /**
     * 四个颜色，可由用户自定义，初始化时由GestureLockViewGroup传入
     */
    private int mColorNoFingerInner;
    private int mColorNoFingerOutter;
    private int mColorFingerOn;
    private int mColorFingerUp;

    public GestureLockView(Context context , int colorNoFingerInner , int colorNoFingerOutter , int colorFingerOn , int colorFingerUp )
    {
        super(context);
        this.mColorNoFingerInner = colorNoFingerInner;
        this.mColorNoFingerOutter = colorNoFingerOutter;
        this.mColorFingerOn = colorFingerOn;
        this.mColorFingerUp = colorFingerUp;
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mArrowPath = new Path();

    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        mWidth = MeasureSpec.getSize(widthMeasureSpec);
        mHeight = MeasureSpec.getSize(heightMeasureSpec);

        // 取长和宽中的小值
        mWidth = mWidth < mHeight ? mWidth : mHeight;
        mRadius = mCenterX = mCenterY = mWidth / 2;
        mRadius -= mStrokeWidth / 2;

        // 绘制三角形，初始时是个默认箭头朝上的一个等腰三角形，用户绘制结束后，根据由两个GestureLockView决定需要旋转多少度
        float mArrowLength = mWidth / 2 * mArrowRate;
        mArrowPath.moveTo(mWidth / 2, mStrokeWidth + 2);
        mArrowPath.lineTo(mWidth / 2 - mArrowLength, mStrokeWidth + 2
                + mArrowLength);
        mArrowPath.lineTo(mWidth / 2 + mArrowLength, mStrokeWidth + 2
                + mArrowLength);
        mArrowPath.close();
        mArrowPath.setFillType(Path.FillType.WINDING);

    }

    @Override
    protected void onDraw(Canvas canvas)
    {

        switch (mCurrentStatus)
        {
        case STATUS_FINGER_ON:

            // 绘制外圆
            mPaint.setStyle(Style.STROKE);
            mPaint.setColor(mColorFingerOn);
            mPaint.setStrokeWidth(2);
            canvas.drawCircle(mCenterX, mCenterY, mRadius, mPaint);
            // 绘制内圆
            mPaint.setStyle(Style.FILL);
            canvas.drawCircle(mCenterX, mCenterY, mRadius
                    * mInnerCircleRadiusRate, mPaint);
            break;
        case STATUS_FINGER_UP:
            // 绘制外圆
            mPaint.setColor(mColorFingerUp);
            mPaint.setStyle(Style.STROKE);
            mPaint.setStrokeWidth(2);
            canvas.drawCircle(mCenterX, mCenterY, mRadius, mPaint);
            // 绘制内圆
            mPaint.setStyle(Style.FILL);
            canvas.drawCircle(mCenterX, mCenterY, mRadius
                    * mInnerCircleRadiusRate, mPaint);

            drawArrow(canvas);

            break;

        case STATUS_NO_FINGER:

            // 绘制外圆
            mPaint.setStyle(Style.FILL);
            mPaint.setColor(mColorNoFingerOutter);
            canvas.drawCircle(mCenterX, mCenterY, mRadius, mPaint);
            // 绘制内圆
            mPaint.setColor(mColorNoFingerInner);
            canvas.drawCircle(mCenterX, mCenterY, mRadius
                    * mInnerCircleRadiusRate, mPaint);
            break;

        }

    }

    /**
     * 绘制箭头
     * @param canvas
     */
    private void drawArrow(Canvas canvas)
    {
        if (mArrowDegree != -1)
        {
            mPaint.setStyle(Paint.Style.FILL);

            canvas.save();
            canvas.rotate(mArrowDegree, mCenterX, mCenterY);
            canvas.drawPath(mArrowPath, mPaint);

            canvas.restore();
        }

    }

    /**
     * 设置当前模式并重绘界面
     * 
     * @param mode
     */
    public void setMode(Mode mode)
    {
        this.mCurrentStatus = mode;
        invalidate();
    }

    public void setArrowDegree(int degree)
    {
        this.mArrowDegree = degree;
    }

    public int getArrowDegree()
    {
        return this.mArrowDegree;
    }
}

GestureLockViewGroup

package com.zhy.zhy_gesturelockview.view;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.RelativeLayout;

import com.zhy.zhy_gesturelockview.R;
import com.zhy.zhy_gesturelockview.view.GestureLockView.Mode;

/**
 * 整体包含n*n个GestureLockView,每个GestureLockView间间隔mMarginBetweenLockView，
 * 最外层的GestureLockView与容器存在mMarginBetweenLockView的外边距
 * 
 * 关于GestureLockView的边长（n*n）： n * mGestureLockViewWidth + ( n + 1 ) *
 * mMarginBetweenLockView = mWidth ; 得：mGestureLockViewWidth = 4 * mWidth / ( 5
 * * mCount + 1 ) 注：mMarginBetweenLockView = mGestureLockViewWidth * 0.25 ;
 * 
 * @author zhy
 * 
 */
public class GestureLockViewGroup extends RelativeLayout
{

    private static final String TAG = "GestureLockViewGroup";
    /**
     * 保存所有的GestureLockView
     */
    private GestureLockView[] mGestureLockViews;
    /**
     * 每个边上的GestureLockView的个数
     */
    private int mCount = 3;
    /**
     * 存储答案
     */
    private int[] mAnswer = { 0, 1, 2, 5, 8 };
    /**
     * 保存用户选中的GestureLockView的id
     */
    private List<Integer> mChoose = new ArrayList<Integer>();

    private Paint mPaint;
    /**
     * 每个GestureLockView中间的间距 设置为：mGestureLockViewWidth * 25%
     */
    private int mMarginBetweenLockView = 30;
    /**
     * GestureLockView的边长 4 * mWidth / ( 5 * mCount + 1 )
     */
    private int mGestureLockViewWidth;

    /**
     * GestureLockView无手指触摸的状态下内圆的颜色
     */
    private int mNoFingerInnerCircleColor = 0xFF939090;
    /**
     * GestureLockView无手指触摸的状态下外圆的颜色
     */
    private int mNoFingerOuterCircleColor = 0xFFE0DBDB;
    /**
     * GestureLockView手指触摸的状态下内圆和外圆的颜色
     */
    private int mFingerOnColor = 0xFF378FC9;
    /**
     * GestureLockView手指抬起的状态下内圆和外圆的颜色
     */
    private int mFingerUpColor = 0xFFFF0000;

    /**
     * 宽度
     */
    private int mWidth;
    /**
     * 高度
     */
    private int mHeight;

    private Path mPath;
    /**
     * 指引线的开始位置x
     */
    private int mLastPathX;
    /**
     * 指引线的开始位置y
     */
    private int mLastPathY;
    /**
     * 指引下的结束位置
     */
    private Point mTmpTarget = new Point();

    /**
     * 最大尝试次数
     */
    private int mTryTimes = 4;
    /**
     * 回调接口
     */
    private OnGestureLockViewListener mOnGestureLockViewListener;

    public GestureLockViewGroup(Context context, AttributeSet attrs)
    {
        this(context, attrs, 0);
    }

    public GestureLockViewGroup(Context context, AttributeSet attrs,
            int defStyle)
    {
        super(context, attrs, defStyle);
        /**
         * 获得所有自定义的参数的值
         */
        TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
                R.styleable.GestureLockViewGroup, defStyle, 0);
        int n = a.getIndexCount();

        for (int i = 0; i < n; i++)
        {
            int attr = a.getIndex(i);
            switch (attr)
            {
            case R.styleable.GestureLockViewGroup_color_no_finger_inner_circle:
                mNoFingerInnerCircleColor = a.getColor(attr,
                        mNoFingerInnerCircleColor);
                break;
            case R.styleable.GestureLockViewGroup_color_no_finger_outer_circle:
                mNoFingerOuterCircleColor = a.getColor(attr,
                        mNoFingerOuterCircleColor);
                break;
            case R.styleable.GestureLockViewGroup_color_finger_on:
                mFingerOnColor = a.getColor(attr, mFingerOnColor);
                break;
            case R.styleable.GestureLockViewGroup_color_finger_up:
                mFingerUpColor = a.getColor(attr, mFingerUpColor);
                break;
            case R.styleable.GestureLockViewGroup_count:
                mCount = a.getInt(attr, 3);
                break;
            case R.styleable.GestureLockViewGroup_tryTimes:
                mTryTimes = a.getInt(attr, 5);
            default:
                break;
            }
        }

        a.recycle();

        // 初始化画笔
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaint.setStyle(Paint.Style.STROKE);
        // mPaint.setStrokeWidth(20);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        // mPaint.setColor(Color.parseColor("#aaffffff"));
        mPath = new Path();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        mWidth = MeasureSpec.getSize(widthMeasureSpec);
        mHeight = MeasureSpec.getSize(heightMeasureSpec);

        // Log.e(TAG, mWidth + "");
        // Log.e(TAG, mHeight + "");

        mHeight = mWidth = mWidth < mHeight ? mWidth : mHeight;

        // setMeasuredDimension(mWidth, mHeight);

        // 初始化mGestureLockViews
        if (mGestureLockViews == null)
        {
            mGestureLockViews = new GestureLockView[mCount * mCount];
            // 计算每个GestureLockView的宽度
            mGestureLockViewWidth = (int) (4 * mWidth * 1.0f / (5 * mCount + 1));
            //计算每个GestureLockView的间距
            mMarginBetweenLockView = (int) (mGestureLockViewWidth * 0.25);
            // 设置画笔的宽度为GestureLockView的内圆直径稍微小点（不喜欢的话，随便设）
            mPaint.setStrokeWidth(mGestureLockViewWidth * 0.29f);

            for (int i = 0; i < mGestureLockViews.length; i++)
            {
                //初始化每个GestureLockView
                mGestureLockViews[i] = new GestureLockView(getContext(),
                        mNoFingerInnerCircleColor, mNoFingerOuterCircleColor,
                        mFingerOnColor, mFingerUpColor);
                mGestureLockViews[i].setId(i + 1);
                //设置参数，主要是定位GestureLockView间的位置
                RelativeLayout.LayoutParams lockerParams = new RelativeLayout.LayoutParams(
                        mGestureLockViewWidth, mGestureLockViewWidth);

                // 不是每行的第一个，则设置位置为前一个的右边
                if (i % mCount != 0)
                {
                    lockerParams.addRule(RelativeLayout.RIGHT_OF,
                            mGestureLockViews[i - 1].getId());
                }
                // 从第二行开始，设置为上一行同一位置View的下面
                if (i > mCount - 1)
                {
                    lockerParams.addRule(RelativeLayout.BELOW,
                            mGestureLockViews[i - mCount].getId());
                }
                //设置右下左上的边距
                int rightMargin = mMarginBetweenLockView;
                int bottomMargin = mMarginBetweenLockView;
                int leftMagin = 0;
                int topMargin = 0;
                /**
                 * 每个View都有右外边距和底外边距 第一行的有上外边距 第一列的有左外边距
                 */
                if (i >= 0 && i < mCount)// 第一行
                {
                    topMargin = mMarginBetweenLockView;
                }
                if (i % mCount == 0)// 第一列
                {
                    leftMagin = mMarginBetweenLockView;
                }

                lockerParams.setMargins(leftMagin, topMargin, rightMargin,
                        bottomMargin);
                mGestureLockViews[i].setMode(Mode.STATUS_NO_FINGER);
                addView(mGestureLockViews[i], lockerParams);
            }

            Log.e(TAG, "mWidth = " + mWidth + " ,  mGestureViewWidth = "
                    + mGestureLockViewWidth + " , mMarginBetweenLockView = "
                    + mMarginBetweenLockView);

        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event)
    {
        int action = event.getAction();
        int x = (int) event.getX();
        int y = (int) event.getY();

        switch (action)
        {
        case MotionEvent.ACTION_DOWN:
            // 重置
            reset();
            break;
        case MotionEvent.ACTION_MOVE:
            mPaint.setColor(mFingerOnColor);
            mPaint.setAlpha(50);
            GestureLockView child = getChildIdByPos(x, y);
            if (child != null)
            {
                int cId = child.getId();
                if (!mChoose.contains(cId))
                {
                    mChoose.add(cId);
                    child.setMode(Mode.STATUS_FINGER_ON);
                    if (mOnGestureLockViewListener != null)
                        mOnGestureLockViewListener.onBlockSelected(cId);
                    // 设置指引线的起点
                    mLastPathX = child.getLeft() / 2 + child.getRight() / 2;
                    mLastPathY = child.getTop() / 2 + child.getBottom() / 2;

                    if (mChoose.size() == 1)// 当前添加为第一个
                    {
                        mPath.moveTo(mLastPathX, mLastPathY);
                    } else
                    // 非第一个，将两者使用线连上
                    {
                        mPath.lineTo(mLastPathX, mLastPathY);
                    }

                }
            }
            // 指引线的终点
            mTmpTarget.x = x;
            mTmpTarget.y = y;
            break;
        case MotionEvent.ACTION_UP:

            mPaint.setColor(mFingerUpColor);
            mPaint.setAlpha(50);
            this.mTryTimes--;

            // 回调是否成功
            if (mOnGestureLockViewListener != null && mChoose.size() > 0)
            {
                mOnGestureLockViewListener.onGestureEvent(checkAnswer());
                if (this.mTryTimes == 0)
                {
                    mOnGestureLockViewListener.onUnmatchedExceedBoundary();
                }
            }

            Log.e(TAG, "mUnMatchExceedBoundary = " + mTryTimes);
            Log.e(TAG, "mChoose = " + mChoose);
            // 将终点设置位置为起点，即取消指引线
            mTmpTarget.x = mLastPathX;
            mTmpTarget.y = mLastPathY;

            // 改变子元素的状态为UP
            changeItemMode();

            // 计算每个元素中箭头需要旋转的角度
            for (int i = 0; i + 1 < mChoose.size(); i++)
            {
                int childId = mChoose.get(i);
                int nextChildId = mChoose.get(i + 1);

                GestureLockView startChild = (GestureLockView) findViewById(childId);
                GestureLockView nextChild = (GestureLockView) findViewById(nextChildId);

                int dx = nextChild.getLeft() - startChild.getLeft();
                int dy = nextChild.getTop() - startChild.getTop();
                // 计算角度
                int angle = (int) Math.toDegrees(Math.atan2(dy, dx)) + 90;
                startChild.setArrowDegree(angle);
            }
            //reset();
            break;

        }
        invalidate();
        return true;
    }

    private void changeItemMode()
    {
        for (GestureLockView gestureLockView : mGestureLockViews)
        {
            if (mChoose.contains(gestureLockView.getId()))
            {
                gestureLockView.setMode(Mode.STATUS_FINGER_UP);
            }
        }
    }

    /**
     * 
     * 做一些必要的重置
     */
    private void reset()
    {
        mChoose.clear();
        mPath.reset();
        for (GestureLockView gestureLockView : mGestureLockViews)
        {
            gestureLockView.setMode(Mode.STATUS_NO_FINGER);
            gestureLockView.setArrowDegree(-1);
        }
    }
    /**
     * 检查用户绘制的手势是否正确
     * @return
     */
    private boolean checkAnswer()
    {
        if (mAnswer.length != mChoose.size())
            return false;

        for (int i = 0; i < mAnswer.length; i++)
        {
            if (mAnswer[i] != mChoose.get(i))
                return false;
        }

        return true;
    }

    /**
     * 检查当前左边是否在child中
     * @param child
     * @param x
     * @param y
     * @return
     */
    private boolean checkPositionInChild(View child, int x, int y)
    {

        //设置了内边距，即x,y必须落入下GestureLockView的内部中间的小区域中，可以通过调整padding使得x,y落入范围不变大，或者不设置padding
        int padding = (int) (mGestureLockViewWidth * 0.15);

        if (x >= child.getLeft() + padding && x <= child.getRight() - padding
                && y >= child.getTop() + padding
                && y <= child.getBottom() - padding)
        {
            return true;
        }
        return false;
    }

    /**
     * 通过x,y获得落入的GestureLockView
     * @param x
     * @param y
     * @return
     */
    private GestureLockView getChildIdByPos(int x, int y)
    {
        for (GestureLockView gestureLockView : mGestureLockViews)
        {
            if (checkPositionInChild(gestureLockView, x, y))
            {
                return gestureLockView;
            }
        }

        return null;

    }

    /**
     * 设置回调接口
     * 
     * @param listener
     */
    public void setOnGestureLockViewListener(OnGestureLockViewListener listener)
    {
        this.mOnGestureLockViewListener = listener;
    }

    /**
     * 对外公布设置答案的方法
     * 
     * @param answer
     */
    public void setAnswer(int[] answer)
    {
        this.mAnswer = answer;
    }

    /**
     * 设置最大实验次数
     * 
     * @param boundary
     */
    public void setUnMatchExceedBoundary(int boundary)
    {
        this.mTryTimes = boundary;
    }

    @Override
    public void dispatchDraw(Canvas canvas)
    {
        super.dispatchDraw(canvas);
        //绘制GestureLockView间的连线
        if (mPath != null)
        {
            canvas.drawPath(mPath, mPaint);
        }
        //绘制指引线
        if (mChoose.size() > 0)
        {
            if (mLastPathX != 0 && mLastPathY != 0)
                canvas.drawLine(mLastPathX, mLastPathY, mTmpTarget.x,
                        mTmpTarget.y, mPaint);
        }

    }

    public interface OnGestureLockViewListener
    {
        /**
         * 单独选中元素的Id
         * 
         * @param position
         */
        public void onBlockSelected(int cId);

        /**
         * 是否匹配
         * 
         * @param matched
         */
        public void onGestureEvent(boolean matched);

        /**
         * 超过尝试次数
         */
        public void onUnmatchedExceedBoundary();
    }
}

布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:zhy="http://schemas.android.com/apk/res/com.zhy.zhy_gesturelockview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.zhy.zhy_gesturelockview.view.GestureLockViewGroup
        android:id="@+id/id_gestureLockViewGroup"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="#F2F2F7"
        android:gravity="center_vertical"
        zhy:count="3"
        zhy:tryTimes="5" />
<!--   zhy:color_no_finger_inner_circle="#ff085D58"
        zhy:color_no_finger_outer_circle="#ff08F0E0"
        zhy:color_finger_on="#FF1734BF" -->

</RelativeLayout>

调用

package com.zhy.zhy_gesturelockview;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;

import com.zhy.zhy_gesturelockview.view.GestureLockViewGroup;
import com.zhy.zhy_gesturelockview.view.GestureLockViewGroup.OnGestureLockViewListener;

public class MainActivity extends Activity
{

    private GestureLockViewGroup mGestureLockViewGroup;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mGestureLockViewGroup = (GestureLockViewGroup) findViewById(R.id.id_gestureLockViewGroup);
        mGestureLockViewGroup.setAnswer(new int[] { 1, 2, 3 });
        mGestureLockViewGroup
                .setOnGestureLockViewListener(new OnGestureLockViewListener()
                {

                    @Override
                    public void onUnmatchedExceedBoundary()
                    {
                        Toast.makeText(MainActivity.this, "错误5次...",
                                Toast.LENGTH_SHORT).show();
                        mGestureLockViewGroup.setUnMatchExceedBoundary(5);
                    }

                    @Override
                    public void onGestureEvent(boolean matched)
                    {
                        Toast.makeText(MainActivity.this, matched+"",
                                Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onBlockSelected(int cId)
                    {
                    }
                });
    }

}

ondraw() 和dispatchdraw（）的区别

本文中用到了dispatchdraw,
绘制VIew本身的内容，通过调用View.onDraw(canvas)函数实现

绘制自己的孩子通过dispatchDraw（canvas）实现

参考链接

ondraw() 和dispatchdraw（）的区别 - scorplopan的专栏 - 博客频道 - CSDN.NET

在计算箭头应该转化的角度时用到了atan2

atan2 返回的是方位角，也可以理解为计算复数 x+yi 的辐角

参考链接

atan2_百度百科

本文主要参考链接

Android 手势锁的实现 让自己的应用更加安全吧 - Hongyang - 博客频道 - CSDN.NET

源代码下载

源代码下载

完成