Android Ndk - Gradle Build Error

I've successfully compiled the SoundTouch library and copied the resulting files into my project's libs folder. within each one of this folders there is a libsoundtouch.so file. i

Solution 1:

I see you have problems building libsoundtouch.so in Android Studio. This happens, e.g. when the build scripts of a third-part library require special environment. E.g. the only supported way to build webrtc for Android is on 64-bit Linux.

In this case, you can use the prebuilt libraries. Put them in a jniLibs folder under your project (jniLibs/armeabi-v7a/libsoundtouch.soetc.), or set a custom folder for jniLibs in build.gradle (in android {} block):

sourceSets.main.jniLibs.srcDir 'libs'

You should not use externalNativeBuild.ndkBuild.path together with this.

Solution 2:

You should setup your gradle project to build the C++ library.

Please add to your build.gradle the following line (inside the android {} block):

externalNativeBuild.ndkBuild.path = 'jni/Android.mk'

(assuming paths ~/AndroidStudioProjects/Chords2/app/build.gradle and ~/AndroidStudioProjects/Chords2/app/jni/Android.mk).

To reduce compilation time and APK size, you can filter out the ABIs that you don't use, at least while debugging:

ndk { abiFilters 'armeabi-v7a' }

This line goes inside the defaultConfig {} block.

At any rate, after the APK is ready, you can use Build/Analyze APK from Android Studio's menu and check that all .so files are packed into it.