Initial version

- Compiling and linking ok
- Supporting only 'armeabi' for now
- Forcing APP_PLATFORM=android-23 to avoid NDK Bugs:
  android/ndk#272
  android/ndk#410

.gitignore

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+# Built application files
+*.apk
+*.ap_
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+obj/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log Files
+*.log
+
+# Android Studio Navigation editor temp files
+.navigation/
+
+# Android Studio captures folder
+captures/
+
+# IntelliJ
+*.iml
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/gradle.xml
+.idea/dictionaries
+.idea/libraries
+
+# Keystore files
+# Uncomment the following line if you do not want to check your keystore files in.
+#*.jks
+
+# External native build folder generated in Android Studio 2.2 and later
+.externalNativeBuild
+
+# Google Services (e.g. APIs or Firebase)
+google-services.json
+
+# Freeline
+freeline.py
+freeline/
+freeline_project_description.json

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 25
+    buildToolsVersion "25.0.2"
+    defaultConfig {
+        applicationId "org.itriad.opessl.nativetests"
+        minSdkVersion 24
+        targetSdkVersion 25
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+
+        ndk {
+            abiFilters 'armeabi'
+        }
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+    externalNativeBuild {
+        ndkBuild {
+            path "src/main/jni/Android.mk"
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    })
+    compile 'com.android.support.constraint:constraint-layout:1.0.2'
+    testCompile 'junit:junit:4.12'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in /home/nick/devtools/android-sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/org/itriad/nativetests/ExampleInstrumentedTest.java

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+package org.itriad.nativetests;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("org.itriad.nativetests", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="org.itriad.nativetests">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/cpp

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+jni/

app/src/main/java/org/itriad/nativetests/MainActivity.java

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+package org.itriad.nativetests;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.widget.TextView;
+
+public class MainActivity extends Activity {
+
+    // Used to load the 'native-lib' library on application startup.
+    static {
+        System.loadLibrary("native-lib");
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        // Example of a call to a native method
+        TextView tv = (TextView) findViewById(R.id.sample_text);
+        tv.setText(stringFromJNI());
+    }
+
+    /**
+     * A native method that is implemented by the 'native-lib' native library,
+     * which is packaged with this application.
+     */
+    public native String stringFromJNI();
+}

app/src/main/jni/Android.mk

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+LOCAL_PATH := $(call my-dir)
+
+OPENSSL_DIR := $(LOCAL_PATH)/openssl
+
+# Declaring prebuilt libssl.a
+include $(CLEAR_VARS)
+LOCAL_MODULE := libssl
+LOCAL_SRC_FILES := $(OPENSSL_DIR)/lib/$(TARGET_ARCH_ABI)/libssl.a
+include $(PREBUILT_STATIC_LIBRARY)
+
+# Declaring prebuilt libssl.a
+include $(CLEAR_VARS)
+LOCAL_MODULE := libcrypto
+LOCAL_SRC_FILES := $(OPENSSL_DIR)/lib/$(TARGET_ARCH_ABI)/libcrypto.a
+include $(PREBUILT_STATIC_LIBRARY)
+
+# libnative-lib.so
+include $(CLEAR_VARS)
+LOCAL_MODULE    := native-lib
+LOCAL_SRC_FILES := native-lib.cpp
+LOCAL_LDLIBS    := -llog
+LOCAL_C_INCLUDES := $(OPENSSL_DIR)/include
+LOCAL_STATIC_LIBRARIES := libssl libcrypto
+include $(BUILD_SHARED_LIBRARY)
+

app/src/main/jni/Application.mk

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+APP_PLATFORM := android-23
+APP_ABI := armeabi
+APP_STL := stlport_static

app/src/main/jni/native-lib.cpp

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+#include <jni.h>
+#include <string>
+#include <openssl/bio.h>
+
+extern "C"
+JNIEXPORT jstring JNICALL
+Java_org_itriad_nativetests_MainActivity_stringFromJNI(
+        JNIEnv *env,
+        jobject /* this */) {
+
+    BIO *b = (BIO*) malloc(sizeof(BIO));
+    BIO_set_flags(b, 0);
+
+    std::string hello = "Hello from C++";
+    return env->NewStringUTF(hello.c_str());
+}