Android 侧滑关闭Activity的实例

private Activity activity;  private Scroller scroller;  //上次ACTION_MOVE时的X坐标  private int last_X;  //屏幕宽度  private int width;  //可滑动的最小X坐标，小于该坐标的滑动不处理  private int min_X;  // 页面边缘的阴影图  private Drawable left_shodow;  //页面边缘阴影的宽度默认值  private static final int SHADOW_WIDTH = 16;  // 页面边缘阴影的宽度  private int shadow_width;  // Activity finish标识符  private boolean isFinish;