Use dll files in android Application

DLL stands for "Dynamic Link Library" and is a Windows concept. The equivalent in linux is SO (Shared Object).

You can refer to this article in CodeProject for similarities and differences between the two.

This Stackoverflow question is pretty similar.

Android runs on a Linux system - DLL files are usually bytecode compiled for Windows.

If you have the src files for the DLL, try recompiling as an ELF32 shared object, then link that instead into your Android code (- below is a Windows solution):

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set NDK_HOME=C:\Android\android-ndk-r9c   // customize this var for your own location   
set LD_LIBRARY_PATH=%NDK_HOME%\platforms\android-18\arch-arm\usr\lib
cd <C_SOURCE_DIRECTORY>

REM -- TEMPORARILY COPY SOME LIBS COMPILER MAY NEED  
copy %NDK_HOME%\platforms\android-18\arch-arm\usr\lib\crtbegin*.o .   
copy %NDK_HOME%\platforms\android-18\arch-arm\usr\lib\crtend*.o .

REM -- GENERATE YOUR OBJ FILE  
%NDK_HOME%\toolchains\arm-linux-androideabi-4.8\prebuilt\windows-x86_64\bin\arm-linux-androideabi-gcc.exe -g -I%NDK_HOME%\platforms\android-18\arch-arm\usr\include -c -fPIC YourLib.c -o YourLib.o

REM -- GENERATE SHARED OBJ FROM OBJ FILE  
%NDK_HOME%\toolchains\arm-linux-androideabi-4.8\prebuilt\windows-x86_64\bin\arm-linux-androideabi-gcc.exe -g -L%NDK_HOME%\platforms\android-18\arch-arm\usr\lib -shared -o YourLib_so.so YourLib_so.o

REM -- finally, remove the libraries previously copied to src directory

del .\crtbegin*.o     
del .\crtend*.o

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You should now be able to use the resulting .so file in your Android project.