简介

本文介绍一个Android手势密码开源库的使用及实现的详细过程，该开源库主要实现以下几个功能：

1. 支持手势密码的绘制，并支持密码保存功能，解锁时自动比对密码给出结果
2. 封装了绘制密码的方法，比对两次密码是否一致，可以快捷地进行手势密码的设置
3. 可以设置密码输入错误后的重试次数上限
4. 可以自定义不同状态下手势密码图案的颜色
5. 可以自定义手势密码的触摸点数量（n*n）
   

最近需要用到手势密码解锁功能，找了一些demo感觉用起来都有点麻烦，于是参考一些文章自己造了下轮子，封装了相关的一些方法，使用起来比较便捷。

github链接如下，觉得还可以请帮忙star支持下~

github链接    个人博客

使用效果

首先看下使用效果：

使用方法

XML布局文件中使用该控件

<com.syd.oden.gesturelock.view.GestureLockViewGroup
  android:id="@+id/gesturelock"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  app:preference_id="1"
  android:layout_marginTop="30dp"
  app:count="3" />

可以设置的一些参数，说明如下:

1. color_no_finger:未触摸时圆形的颜色
2. color_finger_on:触摸时圆形的颜色
3. color_finger_up_correct:输入正确时圆形的颜色
4. color_finger_up_error:出错时圆形的颜色
5. count：收拾密码的圆形数量，n*n
6. preference_id：手势密码保存的id号，不输入或输入-1则使用默认的id
   

初始化

private void initGesture() {
  mGestureLockViewGroup = (GestureLockViewGroup) findViewById(R.id.gesturelock);
  gestureEventListener();
  gesturePasswordSettingListener();
  gestureRetryLimitListener();
 }

设置手势密码监听事件

private void gestureEventListener() {
  mGestureLockViewGroup.setGestureEventListener(new GestureEventListener() {
   @Override
   public void onGestureEvent(boolean matched) {
    mylog.d("onGestureEvent matched: " + matched);
    if (!matched) {
     tv_state.setTextColor(Color.RED);
     tv_state.setText("手势密码错误");
    } else {
     if (isReset) {
      isReset = false;
      Toast.makeText(MainActivity.this, "清除成功!", Toast.LENGTH_SHORT).show();
      resetGesturePattern();
     } else {
      tv_state.setTextColor(Color.WHITE);
      tv_state.setText("手势密码正确");
     }
    }
   }
  });
 }

若已经设置有密码则会进入该回调，在这里对结果进行处理，上面的例子中加入了一个重设密码的处理。

手势密码设置

private void gesturePasswordSettingListener() {
  mGestureLockViewGroup.setGesturePasswordSettingListener(new GesturePasswordSettingListener() {
   @Override
   public boolean onFirstInputComplete(int len) {
    if (len > 3) {
     tv_state.setTextColor(Color.WHITE);
     tv_state.setText("再次绘制手势密码");
     return true;
    } else {
     tv_state.setTextColor(Color.RED);
     tv_state.setText("最少连接4个点，请重新输入!");
     return false;
    }
   }

   @Override
   public void onSuccess() {
    tv_state.setTextColor(Color.WHITE);
    Toast.makeText(MainActivity.this, "密码设置成功!", Toast.LENGTH_SHORT).show();
    tv_state.setText("请输入手势密码解锁!");
   }

   @Override
   public void onFail() {
    tv_state.setTextColor(Color.RED);
    tv_state.setText("与上一次绘制不一致，请重新绘制");
   }
  });
 }

若还未设置密码，绘制手势的时候会进入该回调，返回值为绘制的触摸点的数量，onFirstInputComplete中返回true则进入第二手势密码的绘制，两次输入一致后自动保存密码。

重试次数超过限制监听

private void gestureRetryLimitListener() {
  mGestureLockViewGroup.setGestureUnmatchedExceedListener(3, new GestureUnmatchedExceedListener() {
   @Override
   public void onUnmatchedExceedBoundary() {
    tv_state.setTextColor(Color.RED);
    tv_state.setText("错误次数过多，请稍后再试!");
   }
  });
 }

若设置了该监听事件，则输入错误有次数限制，超过上限后进入回调，在该回调中进行处理。

清除密码的逻辑自己加个判断处理下即可，具体可以看下github上的demo

其他的一些API

public void removePassword() ：清除密码
public void savePassword() : 保存密码，设置手势密码成功后会自动保存，也可以调用该接口另外设置密码
public void getPassword()： 获取密码
public void setRetryTimes(int retryTimes) ： 设置重试次数上限
public boolean isSetPassword() ： 返回现在是否已经设置有密码
public void resetView() ： 将视图Reset

在项目中导入该库

仅需加入两行代码：

在工程的 build.gradle中加入：

allprojects {
  repositories {
   ...
   maven { url "https://jitpack.io" }
  }
 }

module的build.gradle中加入依赖：

dependencies {
   compile 'com.github.autume:GestureLock:1.0.0'
 }

总的使用就是这样，是不是很简单！

具体实现过程

下面讲下实现的过程，如果只是直接拿来用的话也可以略过这部分。

自定义手势密码的圆形view

这部分主要参考Hongyang大大的博客，稍微修改了一下

初始化传入参数

public GestureLockView(Context context, int colorNoFingerr, int colorFingerOn, int colorCorrect, int colorError) {
  super(context);
  this.mColorNoFinger = colorNoFingerr;
  this.mColorFingerOn = colorFingerOn;
  this.mColorFingerUpCorrect = colorCorrect;
  this.mColorFingerUpError = colorError;
  mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  mArrowPath = new Path();
 }

根据不同的触摸状态绘制不同颜色的圆

@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
    if (GestureLockViewGroup.isCorrect)
     mPaint.setColor(mColorFingerUpCorrect);
    else
     mPaint.setColor(mColorFingerUpError);
    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.STROKE);
    mPaint.setColor(mColorNoFinger);
    canvas.drawCircle(mCenterX, mCenterY, mRadius, mPaint);
    // 绘制内圆
    mPaint.setStyle(Style.FILL);
    mPaint.setColor(mColorNoFinger);
    canvas.drawCircle(mCenterX, mCenterY, mRadius * mInnerCircleRadiusRate, mPaint);
    break;
  }
 }

绘制箭头

@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);
 }

 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();
  }
 }

自定义手势密码的ViewGroup

加入自定义view的属性

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

 <attr name="color_no_finger" format="color" />
 <attr name="color_finger_on" format="color" />
 <attr name="color_finger_up_correct" format="color" />
 <attr name="color_finger_up_error" format="color" />
 <attr name="count" format="integer" />
 <attr name="preference_id" format="integer" />

 <declare-styleable name="GestureLockViewGroup">
  <attr name="color_no_finger" />
  <attr name="color_finger_on" />
  <attr name="color_finger_up_correct" />
  <attr name="color_finger_up_error" />
  <attr name="count" />
  <attr name="preference_id" />
 </declare-styleable>

</resources>

获取参数及初始化

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.obtainStyledAttributes(attrs,
    R.styleable.GestureLockViewGroup, defStyle, 0);

  mNoFingerColor = a.getColor(R.styleable.GestureLockViewGroup_color_no_finger, mNoFingerColor);
  mFingerOnColor = a.getColor(R.styleable.GestureLockViewGroup_color_finger_on, mFingerOnColor);
  mFingerUpColorCorrect = a.getColor(R.styleable.GestureLockViewGroup_color_finger_up_correct, mFingerUpColorCorrect);
  mFingerUpColorError = a.getColor(R.styleable.GestureLockViewGroup_color_finger_up_error, mFingerUpColorError);
  mCount = a.getInt(R.styleable.GestureLockViewGroup_count, mCount);
  mPrferenceId = a.getInt(R.styleable.GestureLockViewGroup_preference_id, mPrferenceId);

  a.recycle();

  /**
   * 获取密码状态
   */
  gesturePreference = new GesturePreference(context, mPrferenceId);
  password = gesturePreference.ReadStringPreference();
  Log.d(TAG, "password now is : " + password);
  isSetPassword = !password.equals("null"); //判断是否已经保存有密码
  isInPasswordSettingMode = !isSetPassword;  //当未设置密码，进入密码设置模式

  // 初始化画笔
  mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  mPaint.setStyle(Paint.Style.STROKE);
  mPaint.setStrokeCap(Paint.Cap.ROUND);
  mPaint.setStrokeJoin(Paint.Join.ROUND);
  mPath = new Path();
 }

根据参数绘制出圆

在onMeasure后调用该方法，绘制圆形矩阵

private GestureLockView[] mGestureLockViews; //保存所有的GestureLockView

private void initViews() {
  // 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
   mPaint.setStrokeWidth(mGestureLockViewWidth * 0.29f);

   for (int i = 0; i < mGestureLockViews.length; i++) {
    //初始化每个GestureLockView
    mGestureLockViews[i] = new GestureLockView(getContext(), mNoFingerColor, mFingerOnColor, mFingerUpColorCorrect, mFingerUpColorError);
    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);
   }
  }
 }

在触摸监听中处理不同事件

@Override
 public boolean onTouchEvent(MotionEvent event) {
  int action = event.getAction();
  int x = (int) event.getX();
  int y = (int) event.getY();
  Log.d(TAG, "mTryTimes : " + mTryTimes);

  //重试次数超过限制，直接返回
  if (mTryTimes <= 0 && isRetryTimeLimit) { 
   return true;
  }

  switch (action) {
   case MotionEvent.ACTION_DOWN:
    reset();  // 重置
    break;
   case MotionEvent.ACTION_MOVE:
    drawAndGetSelectedWhenTouchMove(x, y);
    break;
   case MotionEvent.ACTION_UP:
    if (isInPasswordSettingMode) {
     if (gesturePasswordSettingListener != null)
      setPasswordHandle(); //设置密码
    } else {
     if (mChoose.size() > 0) {
      isCorrect = checkAnswer();
     } else {
      return true;
     }

     if (gestureEventListener != null) {
      gestureEventListener.onGestureEvent(isCorrect); //将结果回调
     }
     if (this.mTryTimes == 0) {
      gestureUnmatchedExceedListener.onUnmatchedExceedBoundary(); //超出重试次数，进入回调
     }
    }
    drawWhenTouchUp();
    break;
  }
  invalidate();
  return true;
 }

 private void drawAndGetSelectedWhenTouchMove(int x, int y) {
  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);
    mChooseString = mChooseString + cId;
    child.setMode(Mode.STATUS_FINGER_ON);
    // 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;
 }

 private void drawWhenTouchUp() {
  if (isCorrect) {
   mPaint.setColor(mFingerUpColorCorrect);
  } else {
   mPaint.setColor(mFingerUpColorError);
  }
  mPaint.setAlpha(50);
  Log.d(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
  setItemModeUp();

  // 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);
  }
 }

 设置密码处理:

private void setPasswordHandle() {
  if (isWaitForFirstInput) {
   if (gesturePasswordSettingListener.onFirstInputComplete(mChooseString.length())) {
    firstInputPassword = mChooseString;
    isWaitForFirstInput = false;
   }
  } else {
   if (firstInputPassword.equals(mChooseString)) {
    gesturePasswordSettingListener.onSuccess();
    savePassword(mChooseString);
    isInPasswordSettingMode = false;
   } else {
    gesturePasswordSettingListener.onFail();
   }
  }
  reset();
 }

检查手势密码是否正确:

public boolean checkAnswer() {
  if (password.equals(mChooseString)) {
   return true;
  } else {
   if (isRetryTimeLimit)
    this.mTryTimes--;
   return false;
  }
 }

重置：

private void reset() {
  mChoose.clear();
  mChooseString = "";
  mPath.reset();
  for (GestureLockView gestureLockView : mGestureLockViews) {
   gestureLockView.setMode(Mode.STATUS_NO_FINGER);
   gestureLockView.setArrowDegree(-1);
  }
 }

对外公开的一些方法

public void setGestureEventListener(GestureEventListener gestureEventListener) {
  this.gestureEventListener = gestureEventListener;
 }

 public void setGestureUnmatchedExceedListener(int retryTimes, GestureUnmatchedExceedListener gestureUnmatchedExceedListener) {
  isRetryTimeLimit = true;
  this.mTryTimes = retryTimes;
  this.gestureUnmatchedExceedListener = gestureUnmatchedExceedListener;
 }

 public void setGesturePasswordSettingListener(GesturePasswordSettingListener gesturePasswordSettingListener) {
  this.gesturePasswordSettingListener = gesturePasswordSettingListener;
 }

 public void removePassword() {
  gesturePreference.WriteStringPreference("null");
  this.isSetPassword = false;
  isWaitForFirstInput = true;
  isInPasswordSettingMode = true;
 }

 public void savePassword(String password) {
  this.password = password;
  gesturePreference.WriteStringPreference(password);
 }

 public String getPassword() {
  return password;
 }

 public void resetView() {
  reset();
  invalidate();
 }

 public void setRetryTimes(int retryTimes) {
  this.mTryTimes = retryTimes;
 }

 public boolean isSetPassword() {
  return isSetPassword;
 }

定义密码存储的Preference

就是简单的存和读

public GesturePreference(Context context, int nameTableId) {
  this.context = context;
  if (nameTableId != -1)
   this.nameTable = nameTable + nameTableId;
 }

 public void WriteStringPreference(String data) {
  SharedPreferences preferences = context.getSharedPreferences(fileName, Context.MODE_PRIVATE);
  SharedPreferences.Editor editor = preferences.edit();
  editor.putString(nameTable, data);
  editor.commit();
 }

 public String ReadStringPreference() {
  SharedPreferences preferences = context.getSharedPreferences(fileName, Context.MODE_PRIVATE);
  return preferences.getString(nameTable, "null");
 }

总结

ok，至此，整个手势密码的实现就完成了。

以上就是小编对Android实现简易手势密码的资料整理，后续继续整理相关资料，谢谢大家对本站的支持！