API目录支持安卓编译，输出libmk_api.a (#1854)

* API目录支持安卓编译，输出libmk_api.a

* API目录支持安卓编译，输出libmk_api.a[参考 wasphin大佬的指导改进了一些地方]

* update ndk version

Co-authored-by: 夏楚 <771730766@qq.com>

Android/app/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 28
-    ndkVersion "21.4.7075529"
+    ndkVersion "25.0.8775105"
     defaultConfig {
         applicationId "com.zlmediakit.demo"
         minSdkVersion 15
@@ -14,7 +14,7 @@ android {
             externalNativeBuild {
                 cmake {
                     cppFlags "-std=c++11 -frtti -fexceptions"
-                    arguments "-DENABLE_API=off", "-DENABLE_TESTS=off", "-DENABLE_PLAYER=off", "-DENABLE_SERVER_LIB=on"
+                    arguments "-DENABLE_API=on", "-DENABLE_API_STATIC_LIB=on", "-DENABLE_TESTS=off", "-DENABLE_PLAYER=off", "-DENABLE_SERVER_LIB=on"
                 }
             }
             ndk {

api/CMakeLists.txt

@@ -58,6 +58,9 @@ target_include_directories(mk_api
 
 if(CMAKE_SYSTEM_NAME MATCHES "Linux")
   target_link_libraries(mk_api -Wl,--start-group ${LINK_LIBRARIES} -Wl,--end-group)
+elseif(CMAKE_SYSTEM_NAME MATCHES "Android")
+  include_directories("${CMAKE_BINARY_DIR}")
+  target_link_libraries(mk_api log -Wl,--start-group ${LINK_LIBRARIES} -Wl,--end-group)
 else()
   target_link_libraries(mk_api jsoncpp ${LINK_LIBRARIES})
 endif()