Android实现网易Tab分类排序控件实现

<com.net168.lib.sorttablayout
  android:id="@+id/layout"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  />

//构造数据源，暂时仅支持string
list<string> data = new arraylist<string>();
for (int i = 0; i < 20; i ++) {
  data.add("item" + i);
}
//设置数据源
vsortlayout.setshowdata(data, 1);

vsortlayout.setonselectlistener(new onselectlistener() {
  //点击事件，点击tab布局里面的item触发
  @override
  public void onselect(view v, int index) {
    toast.maketext(mainactivity.this, "你点击了item ，内容为：" + ((textview)v).gettext(), toast.length_short).show();
  }
  //长按事件，长按tab布局里面的item触发
  @override
  public void onlongselect(view v) {
    toast.maketext(mainactivity.this, "长按tab，开始排列", toast.length_short).show();
  }
});

//如果参数是true的话，开始排序，也就是可以拖动
vsortlayout.setismovelist(true);
//结束排序，并且会返回选择tab的当前新位置
vsortlayout.getandfinishsortdata();

/**
 * 配置参数区域
 * mmaxrow ： 每行的个数
 * magin width tab的间隔和本身的宽度的占比
 * 例如mmaxrow = 4，则宽度会由此策略分配
 * |magin|view|magin|view|magin|view|magin|view|magin|
 * 记控件宽度为这么分配 ： 总宽度 = 5 * magin + 4 * view， 而 magin ： view = mrowmagin ： mrowwidth
 * 可以推导出各个控件的宽度，高度也如此计算
 */
private final int mmaxrow = 4;
private final int mrowmagin = 5;
private final int mrowwidth = 26;
private final int mcolumnmagin = 4;
private final int mcolumnheight = 10;

@override
protected void onlayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) {
   
  final int childcount = getchildcount();
   
  int row = 0;
  int column = 0;
  int startwidth = 0;
  int startheight = 0;
   
  for (int i = 0; i < childcount; i++) {
    view childeview = childlist.get(i);
    row = i / 4;
    column = i % 4;
    startwidth = (int) ((column * (mrowwidth + 2 * mrowmagin) + mrowmagin) * mchildeitemsize);
    startheight = (int) ((row * (mcolumnheight + 2 * mcolumnmagin) + mcolumnmagin) * mchildeitemsize);
    childeview.layout(startwidth ,startheight ,(int)(startwidth + mrowwidth * mchildeitemsize),
         (int)(startheight + mcolumnheight * mchildeitemsize));
  }
   
}

private void movechildview(float x, float y) {
  if (mmovechildview != null) {
    int left = (int) (((mchildindex % 4) * (mrowwidth + 2 * mrowmagin) + mrowmagin) * mchildeitemsize);
    int top = (int) (((mchildindex / 4) * (mcolumnheight + 2 * mcolumnmagin) + mcolumnmagin) * mchildeitemsize);
    int width = (int) (left + mrowwidth * mchildeitemsize);
    int heigth = (int) (top + mcolumnheight * mchildeitemsize);
    int movex = (int) (x - beginx);
    int movey = (int) (y - beginy);
    mmovechildview.layout(left + movex, top + movey, width + movex, heigth + movey);
    mmovechildview.invalidate();
  }
}