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.  * 圖案解鎖  */ public class LockPatternView extends View {  /**   * 圓的畫筆   */  private Paint mCirclePaint;  /**   * 線的畫筆   */  private Paint mLinePaint;  /**   * 圓心數組   */  private PointView[][] mPointViewArray = new PointView[3][3];  /**   * 保存選中點的集合   */  private List<PointView> mSelectedPointViewList;    /**   * 解鎖圖案的邊長   */  private int mPatternWidth;   /**   * 圖案監聽器   */  private OnPatternChangeListener mOnPatternChangeListener;   /**   * 半徑   */  private float mRadius;   /**   * 每個圓圈的下標   */  private int mIndex = 1;   /**   * 第一個點是否選中   */  private boolean mIsSelected;  /**   * 是否繪制結束   */  private boolean mIsFinished;   /**   * 正在滑動并且沒有任何點選中   */  private boolean mIsMovingWithoutCircle = false;   private float mCurrentX, mCurrentY;   /**   * 正常狀態的顏色   */  private static final int NORMAL_COLOR = 0xFF70DBDB;  /**   * 選中狀態的顏色   */  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);    //取屏幕長和寬中的較小值作為圖案的邊長   mPatternWidth = Math.min(getMeasuredWidth(), getMeasuredHeight());   setMeasuredDimension(mPatternWidth, mPatternWidth);  }   @Override  protected void onDraw(Canvas canvas) {   //畫圓   drawCircle(canvas);    //將選中的圓重新繪制一遍，將選中的點和未選中的點區別開來   for (PointView pointView : mSelectedPointViewList) {    mCirclePaint.setColor(SELECTED_COLOR);    canvas.drawCircle(pointView.x, pointView.y, mRadius, mCirclePaint);    mCirclePaint.setColor(NORMAL_COLOR); //每重新繪制一個,將畫筆的顏色重置,保證不會影響其他圓的繪制   }    //點與點畫線   if (mSelectedPointViewList.size() > 0) {    Point pointViewA = mSelectedPointViewList.get(0); //第一個選中的點為A點    for (int i = 0; i < mSelectedPointViewList.size(); i++) {     Point pointViewB = mSelectedPointViewList.get(i); //其他依次遍歷出來的點為B點     drawLine(canvas, pointViewA, pointViewB);     pointViewA = pointViewB;    }     //點與鼠標當前位置繪制軌跡    if (mIsMovingWithoutCircle & !mIsFinished) {     drawLine(canvas, pointViewA, new PointView((int)mCurrentX, (int)mCurrentY));    }   }    super.onDraw(canvas);  }   /**   * 畫圓   * @param canvas 畫布   */  private void drawCircle(Canvas canvas) {   //初始化點的位置   for (int i = 0; i < mPointViewArray.length; i++) {    for (int j = 0; j < mPointViewArray.length; j++) {     //圓心的坐標     int cx = mPatternWidth / 4 * (j + 1);     int cy = mPatternWidth / 4 * (i + 1);      //將圓心放在一個點數組中     PointView pointView = new PointView(cx, cy);     pointView.setIndex(mIndex);     mPointViewArray[i][j] = pointView;     canvas.drawCircle(cx, cy, mRadius, mCirclePaint);     mIndex++;    }   }    mIndex = 1;  }   /**   * 畫線   * @param canvas 畫布   * @param pointA 第一個點   * @param pointB 第二個點   */  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:     //重新繪制     if (mOnPatternChangeListener != null) {      mOnPatternChangeListener.onPatternStarted(true);     }      mSelectedPointViewList.clear();     mIsFinished = false;      selectedPointView = checkSelectPoint();      if (selectedPointView != null) {      //第一次按下的位置在圓內，被選中      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;   }    //將選中的點收集起來   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) {     //繪制錯誤     if (mOnPatternChangeListener != null) {      mOnPatternChangeListener.onPatternChange(null);     }    } else {     //繪制成功     String patternPassword = "";     if (mOnPatternChangeListener != null) {      for (PointView pointView : mSelectedPointViewList) {       patternPassword += pointView.getIndex();      }       if (!TextUtils.isEmpty(patternPassword)) {       mOnPatternChangeListener.onPatternChange(patternPassword);      }     }    }   }    invalidate();   return true;  }   /**   * 判斷當前按下的位置是否在圓心數組中   * @return 返回選中的點   */  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;  }   /**   * 判斷點是否在圓內   * @param x  點X軸坐標   * @param y  點Y軸坐標   * @param cx  圓心X坐標   * @param cy  圓心Y坐標   * @param radius 半徑   * @return  true表示在圓內，false表示在圓外   */  private boolean isWithinCircle(float x, float y, float cx, float cy, float radius) {   //如果點和圓心的距離小于半徑，則證明點在圓內   if (Math.sqrt(Math.pow(x - cx, 2) + Math.pow(y- cy, 2)) <= radius) {    return true;   }    return false;  }   /**   * 設置圖案監聽器   */  public void setOnPatternChangeListener(OnPatternChangeListener onPatternChangeListener) {   if (onPatternChangeListener != null) {    this.mOnPatternChangeListener = onPatternChangeListener;   }  }   /**   * 圖案監聽器   */  public interface OnPatternChangeListener {   /**    * 圖案改變    * @param patternPassword 圖案密碼    */   void onPatternChange(String patternPassword);    /**    * 圖案是否重新繪制    * @param isStarted 重新繪制    */   void onPatternStarted(boolean isStarted);  } } 

package com.jackie.lockpattern;  import android.graphics.Point;  /**  * Created by Jackie on 2015/12/25.  * 自定義點對象  */ public class PointView extends Point {  //用于轉化密碼的下標  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個點");   } else {    mLockPatternHint.setText(patternPassword);   }  }   @Override  public void onPatternStarted(boolean isStarted) {   if (isStarted) {    mLockPatternHint.setText("請繪制圖案");   }  } }