From the second page of the article: Android applications are either written in Java, then compiled on the device to the specific required ISA before running (

From the second page of the article: Android applications are either written in Java, then compiled on the device to the specific required ISA before running (a processes called JIT compilation), or written in the Android Native Development Kit (NDK) to target a specific ISA. Apps written in Java can therefore run on any ISA that Android itself supports, including MIPS. I think it was explained pretty well, actually.