ninja error:missing and no known rule to make it

[BadDateAlex]

I was trying to import your project on my Android Studio and I had this error. I don't know why there isn't a folder named imported-lib,did I miss sth? please help me, thank u.
ninja: error: 'E:/Android/SatellitePhoneCallApp-master/libcodec2-android/src/main/cpp/libcodec2-android/build/imported-lib/armeabi-v7a/libcodec2.so', needed by 'E:/Android/SatellitePhoneCallApp-master/libcodec2-android/build/intermediates/cxx/Debug/3o464q63/obj/armeabi-v7a/libCodec2JNI.so', missing and no known rule to make it

[BadDateAlex]

Have you ever import libcode2.so manually? I can't find it anywhere.

[Nenteru]

@BadDateAlex, To solve your problem, you need to download the native libraries (.so format) and add them to the project.
project/app/natives/ (arm64-v8a and armeabi-v7a .. x86 .. x86_64)

For example, for me it looks like this:

project
    app
        natives
            arm64-v8a
                lib
                    arm64-v8a
                        libcodec2.so
                        libCodec2JNI.so
            armeabi-v7a
                lib
                    armeabi-v7a
                        libcodec2.so
                        libCodec2JNI.so

Next, in gradle, specify the path to these libraries:

android {
        sourceSets {
            main {
                file("${rootDir}/app/natives").eachDir() { dir ->
                    jniLibs.srcDirs += "${dir.path}/lib"
                }
            }
        }
    }

Now you can use native libraries; to do this, specify in the Codec2 class:

import android.support.annotation.RequiresApi;

@RequiresApi(23)
public class Codec2 {

    static {
        System.loadLibrary("codec2");
        System.loadLibrary("Codec2JNI");
    }

    public static final int CODEC2_MODE_3200 = 0;
    public static final int CODEC2_MODE_2400 = 1;
    public static final int CODEC2_MODE_1600 = 2;
    public static final int CODEC2_MODE_1400 = 3;
    public static final int CODEC2_MODE_1300 = 4;
    public static final int CODEC2_MODE_1200 = 5;
    public static final int CODEC2_MODE_700 = 6;
    public static final int CODEC2_MODE_700B = 7;
    public static final int CODEC2_MODE_700C = 8;
    public static final int CODEC2_MODE_WB = 9;

    /**
     * The size of the file header that is written when using c2enc. When decoding, this must be
     * skipped.
     */
    public static final int CODEC2_FILE_HEADER_SIZE = 7;

    public native static long create(int mode);

    public native static int getSamplesPerFrame(long con);

    public native static int getBitsSize(long con);

    public native static int destroy(long con);

    public native static long encode(long con, short[] buf, char[] bits);

    /**
     * Decode one frame from codec2.
     *
     * @param con pointer long, as from the create method
     * @param outputBuffer buffer which will be filled with raw PCM audio decoded
     * @param bits input buffer containing one frame of audio
     *
     * @return 0 on successful completion
     */
    public native static long decode(long con, short[] outputBuffer, byte[] bits);
}

[BadDateAlex]

roject/app/natives/ (arm64-v8a and armeabi-v7a .. x86 .. x86_64)

For example, for me it looks like this:

thx,I finally use an aar version from my co-workers,they build it from linux system.