Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := v8hi
LOCAL_CFLAGS	:= -I/Users/marshall/Source/v8/include -g
LOCAL_LDLIBS	:= -L$(SYSROOT)/usr/lib -ldl -llog -L$(TARGET_OUT)
LOCAL_SRC_FILES := v8hi.cpp
PRIVATE_WHOLE_STATIC_LIBRARIES := $(TARGET_OUT)/libv8.a

$(TARGET_OUT)/libv8.a:
	cp $(LOCAL_PATH)/libv8.a $(TARGET_OUT)

include $(BUILD_SHARED_LIBRARY)

build_v8_android.sh

#!/bin/sh

# NDK r4
ANDROID_NDK=/home/marshall/Apps/android-ndk-r4

# android checkout dir on the android-sdk-2.1_r1 tag
TOP=/home/marshall/Source/android

ABI_BIN=$ANDROID_NDK/build/prebuilt/linux-x86/arm-eabi-4.4.0/bin
CC=$ABI_BIN/arm-eabi-gcc
CXX=$ABI_BIN/arm-eabi-g++
RANLIB=$ABI_BIN/arm-eabi-ranlib
AR=$ABI_BIN/arm-eabi-ar

TOP=$TOP CC=$CC CXX=$CXX RANLIB=$RANLIB AR=$AR scons os=android arch=arm $@

v8hi.cpp

#include <v8.h>
#include <string.h>
#include <jni.h>
#include <android/log.h>

#define LOG_TAG "V8Hi"
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)

const char* ToCString(const v8::String::Utf8Value& value) {
  return *value ? *value : "<string conversion failed>";
}

extern "C" {
    JNIEXPORT jstring JNICALL
    Java_com_example_v8hi_V8Hi_evalJS( JNIEnv* env, jobject thiz, jstring str );
}

JNIEXPORT jstring JNICALL
Java_com_example_v8hi_V8Hi_evalJS( JNIEnv* env, jobject thiz, jstring str )
{
    LOGD("in execJS");
    v8::HandleScope handle_scope;
    v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New();
    v8::Handle<v8::Context> context = v8::Context::New(NULL, global);
    v8::Context::Scope context_scope(context);

    const char* sourceStr = env->GetStringUTFChars(str, NULL);
    LOGD("got source str: %s", sourceStr);

    v8::Handle<v8::String> source = v8::String::New(sourceStr);
    v8::Handle<v8::Script> script = v8::Script::Compile(source);
    v8::Handle<v8::Value> result = script->Run();
    env->ReleaseStringUTFChars(str, sourceStr);

    v8::String::Utf8Value resultStr(result);
    const char* cstr = ToCString(resultStr);
    return env->NewStringUTF(cstr);
}

V8Hi.java

package com.example.v8hi;

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

public class V8Hi extends Activity {
	public static final String TAG = "V8HiActivity";

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

		/*
		 * Create a TextView and set its content. the text is retrieved by
		 * calling a native function.
		 */
		TextView tv = new TextView(this);
		
		Log.d(TAG, "evalJS!");
		tv.setText(evalJS("(function() { return 'hello from JS!'})();"));
		setContentView(tv);
	}

	/*
	 * A native method that is implemented by the 'v8hi' native library,
	 * which is packaged with this application.
	 */
	public native String evalJS(String source);

	static {
		Log.d(TAG, "Loading v8 library..");
		System.loadLibrary("v8hi");
		Log.d(TAG, "Loaded.");
	}
}