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android图标ic_launcher大小
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drawable-hdpi/ic_launcher.png (72x72 px)
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drawable-mdpi/ic_launcher.png (48x48 px)
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drawable-xhdpi/ic_launcher.png (96x96 px)
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drawable-xxhdpi/ic_launcher.png (144x144 px)
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String字符串的操作
/*
* String字符串的截取
*/
String string = "abcdefghijklmnopqrstuvwxyz";
String subString = string.substring(0, 3);//结果：subString="abc"