ListView加载网络图片，防止内存溢出

int anim fade_in 0x7f040000 int anim fade_out 0x7f040001 int anim magnify_fade_in 0x7f040002 int anim magnify_fade_out 0x7f040003 int anim magnify_left_top_in 0x7f040004 int anim magnify_right_top_in 0x7f040005 int anim push_down_in 0x7f040006 int anim push_down_out 0x7f040007 int anim push_left_in 0x7f040008 int anim push_left_out 0x7f040009 int anim push_right_in 0x7f04000a int anim push_right_out 0x7f04000b int anim push_up_in 0x7f04000c int anim push_up_out 0x7f04000d int anim rotate_fade_in 0x7f04000e int anim rotate_fade_out 0x7f04000f int anim shrink_fade_in 0x7f040010 int anim shrink_fade_out 0x7f040011 int anim shrink_left_bottom_in 0x7f040012 int anim shrink_right_bottom_in 0x7f040013 int dimen activity_horizontal_margin 0x7f050000 int dimen activity_vertical_margin 0x7f050001 int drawable ic_launcher 0x7f020000 int drawable xlistview_arrow 0x7f020001 int id action_settings 0x7f09000e int id item_image 0x7f090002 int id item_number 0x7f090004 int id item_title 0x7f090003 int id list 0x7f090000 int id speak_layout 0x7f090001 int id xlistview_footer_content 0x7f090005 int id xlistview_footer_hint_textview 0x7f090007 int id xlistview_footer_progressbar 0x7f090006 int id xlistview_header_arrow 0x7f09000c int id xlistview_header_content 0x7f090008 int id xlistview_header_hint_textview 0x7f09000a int id xlistview_header_progressbar 0x7f09000d int id xlistview_header_text 0x7f090009 int id xlistview_header_time 0x7f09000b int layout activity_main 0x7f030000 int layout item_pic_list 0x7f030001 int layout xlistview_footer 0x7f030002 int layout xlistview_header 0x7f030003 int menu main 0x7f080000 int string action_settings 0x7f060001 int string app_name 0x7f060000 int string hello_world 0x7f060002 int string xlistview_footer_hint_all 0x7f060009 int string xlistview_footer_hint_normal 0x7f060007 int string xlistview_footer_hint_ready 0x7f060008 int string xlistview_header_hint_loading 0x7f060005 int string xlistview_header_hint_normal 0x7f060003 int string xlistview_header_hint_ready 0x7f060004 int string xlistview_header_last_time 0x7f060006 int style AppBaseTheme 0x7f070000 int style AppTheme 0x7f070001