Android自定义九宫格手势锁

package com.ninegrid;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
/**
 * Created by Administrator on 2017/6/24.
 */
public class SuduView extends View {
  //定义默认常量
  private static final int DEFAULT_CELL_WIDTH = 200 ;
  private static final int DEFAULT_CELL_STROKE_WIDTH = 10 ;
  private static final int DEFAULT_SPACE = 100 ;
  //九宫格数组
  private Cell mCells[] = new Cell[9] ;
  //直径
  private int mCellWidth;
  //半径
  private int mCellRadius;
  //边框宽度
  private int mCellStrokeWidth;
  //空白部分
  private int mSpace ;
  //定义画笔
  private Paint mPaintNormal ;
  private Paint mPaintSelected ;
  private float mCurrentX ;
  private float mCurrentY ;
  //判断是否结束的标识
  private boolean mFinish = false ;
  private StringBuffer mSbSelected = new StringBuffer(20);
  public SuduView(Context context) {
    super(context);
    init();
  }
  public SuduView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
  }
  public SuduView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
  }
  private void init(){
    //初始化画笔
    mCellWidth = DEFAULT_CELL_WIDTH ;
    mCellRadius = DEFAULT_CELL_WIDTH >> 1 ;
    mCellStrokeWidth = DEFAULT_CELL_STROKE_WIDTH ;
    mSpace = DEFAULT_SPACE ;
    mPaintNormal = new Paint();
    mPaintNormal.setColor(Color.WHITE);
    mPaintNormal.setStrokeWidth(mCellStrokeWidth);
    mPaintNormal.setStyle(Paint.Style.STROKE);
    mPaintNormal.setAntiAlias(true);
    mPaintSelected = new Paint();
    mPaintSelected.setColor(Color.CYAN);
    mPaintSelected.setStrokeWidth(mCellStrokeWidth);
    mPaintSelected.setStyle(Paint.Style.STROKE);
    mPaintSelected.setAntiAlias(true);
    Cell cell ;
    float x;
    float y;
    //计算每个格子的坐标
    for( int i = 0 ; i <9 ; i ++ ){
      x = mSpace * ( i%3 + 1 ) + mCellRadius + mCellWidth * ( i%3 ) ;
      y = mSpace * ( i/3 + 1 ) + mCellRadius + mCellWidth * ( i/3 ) ;
      cell = new Cell(x , y);
      mCells[i] = cell ;
    }
  }
  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    drawCell(canvas);
    drawLine(canvas);
  }
  //绘制连接线
  private void drawLine( Canvas canvas ){
    if("".equals(mSbSelected.toString())){
      return;
    }
    String[] selectedIndexs = mSbSelected.toString().split(",");
    Cell cell = mCells[Integer.valueOf(selectedIndexs[0])];
    Cell nextCell ;
    //绘制每两个格子中心点之间的连接线
    if( selectedIndexs.length > 1) {
      for (int i = 1; i