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, 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);  } } 

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");   }  } }