package com.ndk.hello;public class Classs {    public native String say_hello();    static    {        System.loadLibrary("HelloAndroidNDK");    }}

javah -classpath ../bin/classes com.ndk.hello.Classs

/* DO NOT EDIT THIS FILE - it is machine generated */#include <jni.h>/* Header for class com_ndk_hello_Classs */#ifndef _Included_com_ndk_hello_Classs#define _Included_com_ndk_hello_Classs#ifdef __cplusplusextern "C" {#endif/* * Class:     com_ndk_hello_Classs * Method:    say_hello * Signature: ()Ljava/lang/String; */JNIEXPORT jstring JNICALL Java_com_ndk_hello_Classs_say_1hello  (JNIEnv *, jobject);#ifdef __cplusplus}#endif#endif

#include "com_ndk_hello_Classs.h"JNIEXPORT jstring JNICALL Java_com_ndk_hello_Classs_say_1hello(JNIEnv * env, jobject this){    return (*env)->NewStringUTF(env,"Hello Java NDK!");}

# Copyright (C) 2009 The Android Open Source Project## Licensed under the Apache License, Version 2.0 (the "License");# you may not use this file except in compliance with the License.# You may obtain a copy of the License at##      http://www.apache.org/licenses/LICENSE-2.0## Unless required by applicable law or agreed to in writing, software# distributed under the License is distributed on an "AS IS" BASIS,# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.# See the License for the specific language governing permissions and# limitations under the License.#LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE    := HelloAndroidNDKLOCAL_SRC_FILES := com_ndk_hello_Classs.cinclude $(BUILD_SHARED_LIBRARY)

$NDK/ndk-build

package com.ndk.hello;import com.ndk.hello.Classs;import android.app.Activity;import android.os.Bundle;import android.widget.TextView;public class HelloAndroidNDK extends Activity{    @Override    public void onCreate(Bundle s)    {        super.onCreate(s);                Classs c = new Classs();                String say = c.say_hello();        TextView tv = new TextView(this);          tv.setText(say);          setContentView(tv);      }}