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技術社區[雲棲]
GridView重複調用getView有關問題
使用GridView控件，卻發現getView被重複調用，次數多達上百次，拖垮了係統，影響用戶體驗！ public View getView(int position, View convertView, ViewGroup parent)
{
Log.v(Tag, "<getView> position = " + position);
...
return convertView;
}
log信息：
10-12 10:43:09.880: V/GridViewAdapter(30785): <getView> position = 0 10-12 10:43:09.890: V/GridViewAdapter(30785): <getView> position = 0 10-12 10:43:09.890: V/GridViewAdapter(30785): <getView> position = 0 10-12 10:43:09.900: V/GridViewAdapter(30785): <getView> position = 0 10-12 10:43:09.910: V/GridViewAdapter(30785): <getView> position = 0
其中隻有以下五條信息是正常的，其它都是多餘。
10-12 10:43:10.160: V/GridViewAdapter(30785): <getView> position = 0 10-12 10:43:10.160: V/GridViewAdapter(30785): <getView> position = 1 10-12 10:43:10.170: V/GridViewAdapter(30785): <getView> position = 2 10-12 10:43:10.200: V/GridViewAdapter(30785): <getView> position = 3 10-12 10:43:10.220: V/GridViewAdapter(30785): <getView> position = 4
參考了網上很多的修改的方法，比如布局中高度屬性wrap_content設為固定值或者fill_parent等，但都未起作用。也許遇到問題太特殊，隻能自己想辦法了！
雖然沒有辦法阻止係統重複調用getView，但是我們有辦法讓多餘的getView什麼都不做。如此這般就可以減輕係統負擔，增加用戶體驗。
增加一個變量mCount來記錄position = 0的次數，依據mCount的值來決定執行流程。
public View getView(int position, View convertView, ViewGroup parent)
{
Log.v(Tag, "<getView> position = " + position + " mCount = " + mCount);
if (position == 0)
{
mCount++;
}
else
{
mCount = 0;
}
if (mCount > 1)
{
Log.v(Tag, "<getView> drop !!!");
return convertView;
}
...
return convertView;
}
log信息
10-12 12:57:32.436: V/GridViewAdapter(32222): <getView> position = 0 mCount = 0 10-12 12:57:32.436: V/GridViewAdapter(32222): <getView> position = 0 mCount = 1 10-12 12:57:32.436: V/GridViewAdapter(32222): <getView> drop !!! 10-12 12:57:32.446: V/GridViewAdapter(32222): <getView> position = 0 mCount = 2 10-12 12:57:32.456: V/GridViewAdapter(32222): <getView> drop !!! 10-12 12:57:32.456: V/GridViewAdapter(32222): <getView> position = 0 mCount = 3 10-12 12:57:32.456: V/GridViewAdapter(32222): <getView> drop !!! 10-12 12:57:32.466: V/GridViewAdapter(32222): <getView> position = 0 mCount = 4 10-12 12:57:32.466: V/GridViewAdapter(32222): <getView> drop !!!
最後更新：2017-04-04 07:03:27