Android上要显示一个表格,没有Swing那么专门的JTable可用。
搜了下,一般用GridView,有诸多不便和需要自己实现的地方:
跟ListView一样的Adapter,getView的时候要把表格的二维空间转换成一维来返回。如果表格要画线,问题就来了,返回的Cell View处在一维中的,压根不知道自己在表格中的位置,所以不知道要绘制自己的哪根边界线。于是我封装了一个Cell View的View holder,传入count, column count, position,会根据自己所处的位置自动隐藏/展示上下左右四条边界线。
所有代码在Gist: Grid item view holder for GirdView which show the border lines properly.
https://gist.github.com/Viyu/3af499b51318128d1aab
核心代码:
public void setLineVisible(int totalCount, int columnCount, int position) {
// 只有一个item
if (totalCount < 2) {
mTopLine.setVisibility(View.VISIBLE);
mBottomLine.setVisibility(View.VISIBLE);
mLeftLine.setVisibility(View.VISIBLE);
mRightLine.setVisibility(View.VISIBLE);
return;
}
// 只有一行
if (totalCount == columnCount) {
mTopLine.setVisibility(View.VISIBLE);
mBottomLine.setVisibility(View.VISIBLE);
mRightLine.setVisibility(View.VISIBLE);
if (position == 0) {// 第一个
mLeftLine.setVisibility(View.VISIBLE);
} else {// 后面的
mLeftLine.setVisibility(View.GONE);
}
return;
}
// 只有一列
if (columnCount < 2) {
mLeftLine.setVisibility(View.VISIBLE);
mRightLine.setVisibility(View.VISIBLE);
mBottomLine.setVisibility(View.VISIBLE);
if (position == 0) {// 第一个
mTopLine.setVisibility(View.VISIBLE);
} else {// 后面的
mTopLine.setVisibility(View.GONE);
}
return;
}
// 至少两行两列
if (position == 0) {// 0, 0
mLeftLine.setVisibility(View.VISIBLE);
mRightLine.setVisibility(View.VISIBLE);
mTopLine.setVisibility(View.VISIBLE);
mBottomLine.setVisibility(View.VISIBLE);
} else if (position / columnCount == 0) {// 第一行
mLeftLine.setVisibility(View.GONE);
mRightLine.setVisibility(View.VISIBLE);
mTopLine.setVisibility(View.VISIBLE);
mBottomLine.setVisibility(View.VISIBLE);
} else if(position % columnCount == 0) {//第一列
mLeftLine.setVisibility(View.VISIBLE);
mRightLine.setVisibility(View.VISIBLE);
mTopLine.setVisibility(View.GONE);
mBottomLine.setVisibility(View.VISIBLE);
} else {//其他的
mLeftLine.setVisibility(View.GONE);
mRightLine.setVisibility(View.VISIBLE);
mTopLine.setVisibility(View.GONE);
mBottomLine.setVisibility(View.VISIBLE);
}
}