到底哪种类型是drawable文件夹？
which type is drawable folder exactly?
drawable文件夹是什么类型？
我知道 drawable-ldpi,drawable-mdpi,drawable-hdpi,drawable-xhdpi,drawable-xxhdpi,
drawable-xxxhdpi 和 drawable-nodpi。但是有一个名为drawable的文件夹。
那么它到底是哪一种呢？
drawable目录其实相当于drawable-mdpi。这种等效是为了保持向后兼容性（Android 的早期版本不需要支持多种屏幕密度）。
Commonsware 写道 a good blog post 提到了向后兼容性：
res/drawable/ is a synonym for res/drawable-mdpi/, for backwards compatibility with really old Android apps, written before we had density-specific resources.
如今，它对 XML 定义的可绘制对象很有用，例如形状或 vector drawables:
Because one vector drawable can be used on all pixel densities, this file goes in your default drawables directory (you don't need to use density-specific directories):
res/
drawable/
ic_android_launcher.xml
drawable文件夹是什么类型？ 我知道 drawable-ldpi,drawable-mdpi,drawable-hdpi,drawable-xhdpi,drawable-xxhdpi, drawable-xxxhdpi 和 drawable-nodpi。但是有一个名为drawable的文件夹。 那么它到底是哪一种呢？
drawable目录其实相当于drawable-mdpi。这种等效是为了保持向后兼容性（Android 的早期版本不需要支持多种屏幕密度）。
Commonsware 写道 a good blog post 提到了向后兼容性：
res/drawable/ is a synonym for res/drawable-mdpi/, for backwards compatibility with really old Android apps, written before we had density-specific resources.
如今，它对 XML 定义的可绘制对象很有用，例如形状或 vector drawables:
Because one vector drawable can be used on all pixel densities, this file goes in your default drawables directory (you don't need to use density-specific directories):
res/ drawable/ ic_android_launcher.xml