treewide: integrate with NDK

app/CMakeLists.txt

@@ -0,0 +1,44 @@
+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html
+
+# Sets the minimum version of CMake required to build the native library.
+
+cmake_minimum_required(VERSION 3.4.1)
+
+# Creates and names a library, sets it as either STATIC
+# or SHARED, and provides the relative paths to its source code.
+# You can define multiple libraries, and CMake builds them for you.
+# Gradle automatically packages shared libraries with your APK.
+
+add_library( # Sets the name of the library.
+             song-actions
+
+             # Sets the library as a shared library.
+             SHARED
+
+             # Provides a relative path to your source file(s).
+             src/main/cpp/song-actions.cpp )
+
+# Searches for a specified prebuilt library and stores the path as a
+# variable. Because CMake includes system libraries in the search path by
+# default, you only need to specify the name of the public NDK library
+# you want to add. CMake verifies that the library exists before
+# completing its build.
+
+find_library( # Sets the name of the path variable.
+              log-lib
+
+              # Specifies the name of the NDK library that
+              # you want CMake to locate.
+              log )
+
+# Specifies libraries CMake should link to your target library. You
+# can link multiple libraries, such as libraries you define in this
+# build script, prebuilt third-party libraries, or system libraries.
+
+target_link_libraries( # Specifies the target library.
+                       song-actions
+
+                       # Links the target library to the log library
+                       # included in the NDK.
+                       ${log-lib} )

app/build.gradle

@@ -3,6 +3,7 @@ apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 
 android {
+    ndkVersion '21.0.6113669'
     lintOptions { disable 'RestrictedApi' }
     compileSdkVersion 30
     buildToolsVersion "29.0.3"
@@ -12,6 +13,12 @@ android {
         targetSdkVersion 30
         versionCode 1
         versionName "InterdimensionalBoop"
+
+        externalNativeBuild {
+            cmake {
+                cppFlags ""
+            }
+        }
     }
 
     compileOptions {
@@ -44,6 +51,12 @@ android {
         }
     }
 
+    externalNativeBuild {
+        cmake {
+            path "CMakeLists.txt"
+        }
+    }
+
     packagingOptions {
         exclude 'lib/x86_64/**'
         exclude 'lib/armeabi-v7a/**'

app/src/main/cpp/song-actions.cpp

@@ -0,0 +1,7 @@
+#include <jni.h>
+
+// example fn:
+//extern "C" JNIEXPORT jstring JNICALL
+//Java_io_github_uditkarode_able_activities_MainActivity_getStringFromJNI( JNIEnv* env,
+//                                                  jobject thiz ) {
+//}

app/src/main/kotlin/io/github/uditkarode/able/activities/MainActivity.kt

@@ -89,6 +89,7 @@ class MainActivity : MusicClientActivity(), Search.SongCallback, ServiceResultRe
 
     override fun onCreate(savedInstanceState: Bundle?) {
         NewPipe.init(CustomDownloader.getInstance())
+        System.loadLibrary("song-actions")
 
         launch(Dispatchers.Default) {
             if (checkCallingOrSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)