LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := nativie
LOCAL_SRC_FILES := myNative.c

include $(BUILD_SHARED_LIBRARY)

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

jstring Java_com_gel_ndk_AndroidNDKSample_stringFromJNI(JNIEnv* env, jobject thiz) {
    return (*env)->NewStringUTF(env, "Hello World of NDK !");
}

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class AndroidNDKSample extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        TextView NDKText = (TextView)findViewById(R.id.txtTitle);
        NDKText.setText(stringFromJNI());
    }
   
    public native String  stringFromJNI();
   
    static {
        System.loadLibrary("native");
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android%22
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/txtTitle"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

</LinearLayout>