Ant 封装Android项目 libpng error: Not a PNG file

Ant?打包Android项目由于指定不用android sdk 工具自动生成的build.xml 文件，就自己网上搜了一堆资料，写了个ant脚本，构建过程出现了一堆错误。下面是其中最让我郁闷的错误，     [exec] libpng error: Not a PNG file     [exec] ERROR: Failure processing PNG image res\drawable-hdpi\btn_bg_blue.png     [exec] libpng error: Not a PNG file     [exec] ERROR: Failure processing PNG image res\drawable-hdpi\splash.png     [exec] res\layout\common_list_item2.xml:7: error: Error: No resource found that matches the given name (at 'background' with value [email protected]/listitem_selector').     [exec] res\layout\common_list_item2.xml:20: error: Error: No resource found that matches the given name (at 'background' with value [email protected]/cancelbing_btn_selecter').      ....(看到这个错误，理解错了方向，郁闷资源文件怎么没全部打包进去)错误的原因是btn_bg_blue.png与splash.png这两张图片格式不正确。用ps无法打开。解决方法就简单了，只需重新更新这两张图片。。