手势密码状态监听
手势绘制过程中通过接口OnPatternListener中的4个监听函数来监听手势开始、结束、清除、添加等操作。接口的定义如下：
public static interface OnPatternListener {
/**
* A new pattern has begun.
*/
void onPatternStart();
/**
* The pattern was cleared.
*/
void onPatternCleared();
/**
* The user extended the pattern currently being drawn by one cell.
*
* @param pattern The pattern with newly added cell.
*/
void onPatternCellAdded(List<Cell> pattern);
/**
* A pattern was detected from the user.
*
* @param pattern The pattern.
*/
void onPatternDetected(List<Cell> pattern);
} 
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