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package com.marakana;

public class NativeLib {

  static {
    System.loadLibrary("ndk_demo");
  }
  
  /** 
   * Adds two integers, returning their sum
   */
  public native int add( int v1, int v2 );
  
  /**
   * Returns Hello World string
   */
  public native String hello();
}

NDKDemo/bin$ javah -jni com.marakana.NativeLib
NDKDemo/bin$ mv com_marakana_NativeLib.h ../jni/

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_marakana_NativeLib */

#ifndef _Included_com_marakana_NativeLib
#define _Included_com_marakana_NativeLib
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     com_marakana_NativeLib
 * Method:    add
 * Signature: (II)I
 */
JNIEXPORT jint JNICALL Java_com_marakana_NativeLib_add
  (JNIEnv *, jobject, jint, jint);

/*
 * Class:     com_marakana_NativeLib
 * Method:    hello
 * Signature: ()Ljava/lang/String;
 */
JNIEXPORT jstring JNICALL Java_com_marakana_NativeLib_hello
  (JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif

#include "com_marakana_NativeLib.h"

JNIEXPORT jstring JNICALL Java_com_marakana_NativeLib_hello
  (JNIEnv * env, jobject obj) {
		return (*env)->NewStringUTF(env, "Hello World!");
}

JNIEXPORT jint JNICALL Java_com_marakana_NativeLib_add
  (JNIEnv * env, jobject obj, jint value1, jint value2) {
		return (value1 + value2);
}

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := ndk_demo
LOCAL_SRC_FILES := ndk_demo.c

include $(BUILD_SHARED_LIBRARY)

APP_PROJECT_PATH := $(call my-dir)/project
APP_MODULES      := ndk_demo

android-ndk-1.5_r1$ make APP=ndk_demo
Android NDK: Building for application 'ndk_demo'    
Compile thumb  : ndk_demo <= sources/ndk_demo/ndk_demo.c
SharedLibrary  : libndk_demo.so
Install        : libndk_demo.so => apps/ndk_demo/project/libs/armeabi

package com.marakana;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class NDKDemo extends Activity {
  NativeLib nativeLib;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    nativeLib = new NativeLib();
    String helloText = nativeLib.hello();

    // Update the UI
    TextView outText = (TextView) findViewById(R.id.textOut);
    outText.setText(helloText);

    // Setup the UI
    Button buttonCalc = (Button) findViewById(R.id.buttonCalc);

    buttonCalc.setOnClickListener(new OnClickListener() {
      TextView result = (TextView) findViewById(R.id.result);
      EditText value1 = (EditText) findViewById(R.id.value1);
      EditText value2 = (EditText) findViewById(R.id.value2);

      public void onClick(View v) {
        int v1, v2, res = -1;
        v1 = Integer.parseInt(value1.getText().toString());
        v2 = Integer.parseInt(value2.getText().toString());

        res = nativeLib.add(v1, v2);
        result.setText(new Integer(res).toString());
      }
    });
  }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical" android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <TextView android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:text="NDK Demo"
    android:textSize="22sp" />
  <TextView android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:id="@+id/textOut"
    android:text="output"></TextView>
  <EditText android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:id="@+id/value1"
    android:hint="Value 1"></EditText>
  <TextView android:id="@+id/TextView01" android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:text="+"
    android:textSize="36sp"></TextView>
  <EditText android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:id="@+id/value2"
    android:hint="Value 2"></EditText>
  <Button android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:id="@+id/buttonCalc"
    android:text="="></Button>
  <TextView android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:text="result"
    android:textSize="36sp" android:id="@+id/result"></TextView>
</LinearLayout>