轻松实现Android自定义九宫格图案解锁

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,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,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,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); 
 } 
} 

package com.jackie.lockpattern; 
 
import android.graphics.Point; 
 
/** 
 * Created by Jackie on 2015/12/25. 
 * 自定义点对象 
 */ 
public class PointView extends Point { 
 //用于转化密码的下标 
 public int index; 
 
 public PointView(int x,int y) { 
  super(x,y); 
 } 
 
 public int getIndex() { 
  return index; 
 } 
 
 public void setIndex(int index) { 
  this.index = index; 
 } 
} 

package com.jackie.lockpattern; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.widget.TextView; 
 
public class MainActivity extends Activity implements LockPatternView.OnPatternChangeListener { 
 private TextView mLockPatternHint; 
 private LockPatternView mLockPatternView; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.activity_main); 
 
  mLockPatternHint = (TextView) findViewById(R.id.lock_pattern_hint); 
  mLockPatternView = (LockPatternView) findViewById(R.id.lock_pattern_view); 
  mLockPatternView.setOnPatternChangeListener(this); 
 
 } 
 
 @Override 
 public void onPatternChange(String patternPassword) { 
  if (patternPassword == null) { 
   mLockPatternHint.setText("至少5个点"); 
  } else { 
   mLockPatternHint.setText(patternPassword); 
  } 
 } 
 
 @Override 
 public void onPatternStarted(boolean isStarted) { 
  if (isStarted) { 
   mLockPatternHint.setText("请绘制图案"); 
  } 
 } 
}