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My local.properties

sdk.dir=F\:\\SDK
ndk.dir=C\:\\NDK

Its not generating .so files ..

apply plugin: 'com.android.application'

android {
compileSdkVersion 21
buildToolsVersion "22.0.1"

defaultConfig {
    applicationId "com.example.hellojni"
    minSdkVersion 17
    targetSdkVersion 21
    sourceSets.main {
        jni.srcDirs = []
        jniLibs.srcDir 'src/main/libs'

    }

    ndk {
        moduleName "hello-jni"
        cFlags "-std=c++11 -fexceptions"
        ldLibs "log"
        stl "gnustl_shared"
        abiFilter "armeabi-v7a"
    }

    task nativeLibsToJar(type: Zip, description: 'create a jar archive of the native libs') {
        destinationDir file("$buildDir/native-libs")
        baseName 'native-libs'
        extension 'jar'
        from fileTree(dir: 'libs', include: '**/*.so')
        into 'lib/'
    }

    tasks.withType(JavaCompile) {
        compileTask -> compileTask.dependsOn(nativeLibsToJar)
    }







    testApplicationId "com.example.hellojni.tests"
    testInstrumentationRunner "android.test.InstrumentationTestRunner"
}


buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
    }
}

dependencies {
    compile fileTree(dir: "$buildDir/native-libs", include: 'native-libs.jar')
}

}

in Android.mk

include<com.example.hellojni.HelloJni.h>

#include <string.h>
 #include <jni.h>



 jstring
 Java_com_example_hellojni_HelloJni_stringFromJNI( JNIEnv* env,
                                              jobject thiz )

{ #if defined(arm) #if defined(ARM_ARCH_7A) #if defined(ARM_NEON) #if defined(__ARM_PCS_VFP) #define ABI "armeabi-v7a/NEON (hard-float)" #else #define ABI "armeabi-v7a/NEON" #endif #else #if defined(__ARM_PCS_VFP) #define ABI "armeabi-v7a (hard-float)" #else #define ABI "armeabi-v7a" #endif #endif #else #define ABI "armeabi" #endif #elif defined(i386) #define ABI "x86" #elif defined(x86_64) #define ABI "x86_64" #elif defined(__mips64) /* mips64el-* toolchain defines mips too */ #define ABI "mips64" #elif defined(mips) #define ABI "mips" #elif defined(aarch64) #define ABI "arm64-v8a" #else #define ABI "unknown" #endif

return (*env)->NewStringUTF(env, "Hello from JNI !  Compiled with ABI " ABI ".");

}

in java

  public class HelloJni extends Activity
 {
      /** Called when the activity is first created. */
      @Override
         public void onCreate(Bundle savedInstanceState)
        {
        super.onCreate(savedInstanceState);

    
    TextView  tv = new TextView(this);
    tv.setText( stringFromJNI() );
    setContentView(tv);
}


public native String  stringFromJNI();


public native String  unimplementedStringFromJNI();


static {
    System.loadLibrary("hello-jni");
}

}

apply plugin: 'com.android.application'

android {
compileSdkVersion 21
buildToolsVersion "22.0.1"

defaultConfig {
    applicationId "com.example.hellojni"
    minSdkVersion 17
    targetSdkVersion 21
    sourceSets.main {
        jni.srcDirs = []
        jniLibs.srcDir 'src/main/libs'

    }

    ndk {
        moduleName "hello-jni"
        cFlags "-std=c++11 -fexceptions"
        ldLibs "log"
        stl "gnustl_shared"
        abiFilter "armeabi-v7a"
    }

    task nativeLibsToJar(type: Zip, description: 'create a jar archive of the native libs') {
        destinationDir file("$buildDir/native-libs")
        baseName 'native-libs'
        extension 'jar'
        from fileTree(dir: 'libs', include: '**/*.so')
        into 'lib/'
    }

    tasks.withType(JavaCompile) {
        compileTask -> compileTask.dependsOn(nativeLibsToJar)
    }







    testApplicationId "com.example.hellojni.tests"
    testInstrumentationRunner "android.test.InstrumentationTestRunner"
}


buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
    }
}

dependencies {
    compile fileTree(dir: "$buildDir/native-libs", include: 'native-libs.jar')
} 


}

in Android.mk

include<com.example.hellojni.HelloJni.h>

#include <string.h>
 #include <jni.h>



 jstring
 Java_com_example_hellojni_HelloJni_stringFromJNI( JNIEnv* env,
                                              jobject thiz )
{
  #if defined(__arm__)
    #if defined(__ARM_ARCH_7A__)
      #if defined(__ARM_NEON__)
        #if defined(__ARM_PCS_VFP)
          #define ABI "armeabi-v7a/NEON (hard-float)"
        #else
          #define ABI "armeabi-v7a/NEON"
        #endif
          #else
           #if defined(__ARM_PCS_VFP)
        #define ABI "armeabi-v7a (hard-float)"
         #else
        #define ABI "armeabi-v7a"
       #endif
     #endif
   #else
   #define ABI "armeabi"
  #endif
 #elif defined(__i386__)
   #define ABI "x86"
  #elif defined(__x86_64__)
   #define ABI "x86_64"
  #elif defined(__mips64)  /* mips64el-* toolchain defines __mips__ too */
   #define ABI "mips64"
  #elif defined(__mips__)
   #define ABI "mips"
  #elif defined(__aarch64__)
   #define ABI "arm64-v8a"
#else
     #define ABI "unknown"
  #endif

    return (*env)->NewStringUTF(env, "Hello from JNI !  Compiled with ABI " ABI ".");
}

in java

  public class HelloJni extends Activity
 {
      /** Called when the activity is first created. */
      @Override
         public void onCreate(Bundle savedInstanceState)
        {
        super.onCreate(savedInstanceState);

    
    TextView  tv = new TextView(this);
    tv.setText( stringFromJNI() );
    setContentView(tv);
}


public native String  stringFromJNI();


public native String  unimplementedStringFromJNI();


static {
    System.loadLibrary("hello-jni");
}
}