Ajesh R
1 month ago
parent
689ef92e41
commit
a282b3e72e
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/build
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plugins {
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id("java-library")
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alias(libs.plugins.kotlin.jvm)
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}
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java {
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sourceCompatibility = JavaVersion.VERSION_11
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targetCompatibility = JavaVersion.VERSION_11
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}
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kotlin {
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compilerOptions {
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jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_11
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}
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}
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package com.example.lib
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class MyClass {
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}
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/build
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plugins {
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alias(libs.plugins.android.library)
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alias(libs.plugins.kotlin.android)
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}
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android {
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namespace = "com.example.nativelib"
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compileSdk = 36
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defaultConfig {
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minSdk = 21
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testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
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consumerProguardFiles("consumer-rules.pro")
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externalNativeBuild {
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cmake {
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cppFlags("")
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}
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}
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}
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buildTypes {
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release {
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isMinifyEnabled = false
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proguardFiles(
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getDefaultProguardFile("proguard-android-optimize.txt"),
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"proguard-rules.pro"
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)
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}
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}
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externalNativeBuild {
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cmake {
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path("src/main/cpp/CMakeLists.txt")
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version = "3.22.1"
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}
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}
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compileOptions {
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sourceCompatibility = JavaVersion.VERSION_11
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targetCompatibility = JavaVersion.VERSION_11
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}
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kotlinOptions {
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jvmTarget = "11"
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}
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}
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dependencies {
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implementation(libs.androidx.core.ktx)
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implementation(libs.androidx.appcompat)
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implementation(libs.material)
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testImplementation(libs.junit)
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androidTestImplementation(libs.androidx.junit)
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androidTestImplementation(libs.androidx.test.espresso.core)
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}
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# Add project specific ProGuard rules here.
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# You can control the set of applied configuration files using the
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# proguardFiles setting in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}
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# Uncomment this to preserve the line number information for
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# debugging stack traces.
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#-keepattributes SourceFile,LineNumberTable
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# If you keep the line number information, uncomment this to
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# hide the original source file name.
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#-renamesourcefileattribute SourceFile
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package com.example.nativelib
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import androidx.test.platform.app.InstrumentationRegistry
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import androidx.test.ext.junit.runners.AndroidJUnit4
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import org.junit.Test
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import org.junit.runner.RunWith
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import org.junit.Assert.*
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/**
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* Instrumented test, which will execute on an Android device.
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*
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* See [testing documentation](http://d.android.com/tools/testing).
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*/
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@RunWith(AndroidJUnit4::class)
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class ExampleInstrumentedTest {
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@Test
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fun useAppContext() {
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// Context of the app under test.
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val appContext = InstrumentationRegistry.getInstrumentation().targetContext
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assertEquals("com.example.nativelib.test", appContext.packageName)
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}
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}
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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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</manifest>
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# For more information about using CMake with Android Studio, read the
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# documentation: https://d.android.com/studio/projects/add-native-code.html.
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# For more examples on how to use CMake, see https://github.com/android/ndk-samples.
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# Sets the minimum CMake version required for this project.
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cmake_minimum_required(VERSION 3.22.1)
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# Declares the project name. The project name can be accessed via ${ PROJECT_NAME},
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# Since this is the top level CMakeLists.txt, the project name is also accessible
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# with ${CMAKE_PROJECT_NAME} (both CMake variables are in-sync within the top level
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# build script scope).
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project("nativelib")
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# Creates and names a library, sets it as either STATIC
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# or SHARED, and provides the relative paths to its source code.
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# You can define multiple libraries, and CMake builds them for you.
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# Gradle automatically packages shared libraries with your APK.
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#
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# In this top level CMakeLists.txt, ${CMAKE_PROJECT_NAME} is used to define
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# the target library name; in the sub-module's CMakeLists.txt, ${PROJECT_NAME}
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# is preferred for the same purpose.
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#
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# In order to load a library into your app from Java/Kotlin, you must call
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# System.loadLibrary() and pass the name of the library defined here;
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# for GameActivity/NativeActivity derived applications, the same library name must be
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# used in the AndroidManifest.xml file.
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add_library(${CMAKE_PROJECT_NAME} SHARED
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# List C/C++ source files with relative paths to this CMakeLists.txt.
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nativelib.cpp
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)
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# Specifies libraries CMake should link to your target library. You
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# can link libraries from various origins, such as libraries defined in this
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# build script, prebuilt third-party libraries, or Android system libraries.
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target_link_libraries(${CMAKE_PROJECT_NAME}
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# List libraries link to the target library
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android
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log)
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#include <jni.h>
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#include <string>
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extern "C" JNIEXPORT jstring JNICALL
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Java_com_example_nativelib_NativeLib_stringFromJNI(
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JNIEnv* env,
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jobject /* this */) {
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std::string hello = "Hello from C++";
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return env->NewStringUTF(hello.c_str());
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}
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package com.example.nativelib
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class NativeLib {
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/**
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* A native method that is implemented by the 'nativelib' native library,
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* which is packaged with this application.
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*/
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external fun stringFromJNI(): String
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companion object {
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// Used to load the 'nativelib' library on application startup.
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init {
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System.loadLibrary("nativelib")
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}
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}
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}
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@ -0,0 +1,17 @@
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package com.example.nativelib
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import org.junit.Test
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import org.junit.Assert.*
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/**
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* Example local unit test, which will execute on the development machine (host).
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*
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* See [testing documentation](http://d.android.com/tools/testing).
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*/
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class ExampleUnitTest {
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@Test
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fun addition_isCorrect() {
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assertEquals(4, 2 + 2)
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}
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}
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@ -0,0 +1,42 @@
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/*
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* Copyright 2025 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.samples.apps.nowinandroid
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import android.util.Log
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val TAG: String = "R8"
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/**
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* A class with private members to demonstrate reflection.
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*/
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class LibraryClass {
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private val secretMessage: Message = Message("R8 will remove me")
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}
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data class Message(
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val message: String,
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val id: Int = 0
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)
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// In your app code:
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fun accessSecretMessage(instance: LibraryClass) {
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// Use Java reflection from Kotlin to access the private field
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val secretField = instance::class.java.getDeclaredField("secretMessage")
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secretField.isAccessible = true
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val message = secretField.get(instance) as Message
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Log.d(TAG, message.toString())
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}
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Reference in new issue