diff --git a/android/hello_world/.buckconfig b/android/hello_world/.buckconfig
new file mode 100644
index 0000000..e0d7b2a
--- /dev/null
+++ b/android/hello_world/.buckconfig
@@ -0,0 +1,11 @@
+[cache]
+ mode = dir
+ dir_max_size = 1GB
+
+[android]
+ target = android-32
+
+[java]
+ src_roots = /java/
+ source_level = 8
+ target_level = 8
diff --git a/android/hello_world/.gitignore b/android/hello_world/.gitignore
new file mode 100644
index 0000000..df00246
--- /dev/null
+++ b/android/hello_world/.gitignore
@@ -0,0 +1,35 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/app/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
+
+app/libs/*
+
+# Buck
+/.buckd
+/buck-out
+/buck-cache
+
+# Keystores
+# In Buck, all input files must live under the project root.
+# Therefore, you need to create the following files in this
+# project with your own keystore:
+keystore/debug.keystore
+# Most likely, you can use the standard debug keystore by running
+# the following:
+#
+# cp ~/.android/debug.keystore keystore/debug.keystore
+
+third-party
\ No newline at end of file
diff --git a/android/hello_world/README.md b/android/hello_world/README.md
new file mode 100644
index 0000000..0ab1776
--- /dev/null
+++ b/android/hello_world/README.md
@@ -0,0 +1,55 @@
+This is a sample Android app that can be built with gradle and buck.
+
+How to build
+-------------
+
+Define ANDROID_SDK environment variable
+```shell
+export ANDROID_SDK=/home/yourname/Android/Sdk
+```
+
+Generate a keystore:
+```shell
+cd keystore
+keytool -genkey -keystore debug.keystore -alias my_alias \
+> -keyalg RSA -keysize 2048 -validity 10000
+```
+Update the keystore password in keystore/debug.keystore.properties.
+
+Create a list of project dependencies
+```shell
+cd ..
+mkdir buck-out
+./gradlew -q :app:dependencies --configuration debugCompileClasspath > buck-out/deps.txt
+./gradlew -q :app:dependencies --configuration debugRuntimeClasspath >> buck-out/deps.txt
+./gradlew -q :app:dependencies --configuration debugAnnotationProcessorClasspath >> buck-out/deps.txt
+```
+
+Use the import_deps tool to download dependencies and generate BUCK files.
+```shell
+cd ../import_deps
+./importdeps.py --gdeps /Users/mdzyuba/whatsapp/android/tools/buck/hello_world/buck-out/deps.txt --libs third-party
+cd ../hello_world
+mv ../import_deps/third-party .
+```
+Verify the generated third-party BUCK
+```shell
+buck targets //third-party:
+buck build //third-party:core
+```
+Start an Android emulator or device. It could be based on SDK Platform v21 - v32.
+
+To build and install the app, run:
+```shell
+buck install //app:app
+```
+Then run Hello World app on the device.
+
+Hare is a list of sample buck targets:
+```shell
+buck build //app:deps
+buck build //app:lib
+buck build //keystore:debug_keystore
+buck build //app:app
+```
+
diff --git a/android/hello_world/app/BUCK b/android/hello_world/app/BUCK
new file mode 100644
index 0000000..abe3f8f
--- /dev/null
+++ b/android/hello_world/app/BUCK
@@ -0,0 +1,51 @@
+
+android_library(
+ name = "deps",
+ exported_deps = [
+ "//third-party/androidx/appcompat:appcompat",
+ "//third-party/com/google/android/material:material",
+ "//third-party/androidx/constraintlayout:constraintlayout"
+ ],
+ visibility = ["PUBLIC"],
+)
+
+android_build_config(
+ name = "build_config",
+ package = "com.example.helloworld",
+)
+
+android_resource(
+ name = 'res',
+ res = 'src/main/res',
+ package = 'com.example.helloworld',
+ visibility = [
+ "PUBLIC",
+ ],
+)
+
+android_library(
+ name = 'lib',
+ srcs = glob(['src/main/java/**/*.java']),
+ deps = [
+ ':res',
+ ':deps'
+ ],
+)
+
+android_binary(
+ name = 'app',
+ aapt_mode = 'aapt2',
+ manifest = 'src/main/AndroidManifest.xml',
+ manifest_entries = {
+ 'version_code': 1,
+ 'version_name': '1.0',
+ 'min_sdk_version': 21,
+ 'target_sdk_version': 32
+ },
+ keystore = '//keystore:debug_keystore',
+ deps = [
+ ':lib',
+ ':res',
+ ':deps',
+ ],
+)
diff --git a/android/hello_world/app/build.gradle b/android/hello_world/app/build.gradle
new file mode 100644
index 0000000..3b2d12c
--- /dev/null
+++ b/android/hello_world/app/build.gradle
@@ -0,0 +1,54 @@
+plugins {
+ id 'com.android.application'
+}
+
+android {
+ compileSdk 32
+
+ defaultConfig {
+ applicationId "com.example.helloworld"
+ minSdk 21
+ targetSdk 32
+ versionCode 1
+ versionName "1.0"
+
+ testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+ }
+
+ buildTypes {
+ release {
+ minifyEnabled false
+ proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+ }
+ }
+ compileOptions {
+ sourceCompatibility JavaVersion.VERSION_1_8
+ targetCompatibility JavaVersion.VERSION_1_8
+ }
+}
+
+dependencies {
+ implementation 'androidx.appcompat:appcompat:1.4.1'
+ implementation 'com.google.android.material:material:1.5.0'
+ implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
+ testImplementation 'junit:junit:4.13.2'
+ androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+ androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+}
+
+configurations {
+ toCopy
+}
+
+dependencies {
+ toCopy 'androidx.appcompat:appcompat:1.4.1'
+ toCopy 'com.google.android.material:material:1.5.0'
+ toCopy 'androidx.constraintlayout:constraintlayout:2.1.3'
+}
+
+task download(type: Copy) {
+ from configurations.toCopy
+ into 'libs'
+}
+
+
diff --git a/android/hello_world/app/proguard-rules.pro b/android/hello_world/app/proguard-rules.pro
new file mode 100644
index 0000000..481bb43
--- /dev/null
+++ b/android/hello_world/app/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+# http://developer.android.com/guide/developing/tools/proguard.html
+
+# 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
\ No newline at end of file
diff --git a/android/hello_world/app/src/androidTest/java/com/example/helloworld/ExampleInstrumentedTest.java b/android/hello_world/app/src/androidTest/java/com/example/helloworld/ExampleInstrumentedTest.java
new file mode 100644
index 0000000..f8fdd40
--- /dev/null
+++ b/android/hello_world/app/src/androidTest/java/com/example/helloworld/ExampleInstrumentedTest.java
@@ -0,0 +1,24 @@
+package com.example.helloworld;
+
+import static org.junit.Assert.*;
+
+import android.content.Context;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see Testing documentation
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+ @Test
+ public void useAppContext() {
+ // Context of the app under test.
+ Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+ assertEquals("com.example.helloworld", appContext.getPackageName());
+ }
+}
diff --git a/android/hello_world/app/src/main/AndroidManifest.xml b/android/hello_world/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..33f1bc7
--- /dev/null
+++ b/android/hello_world/app/src/main/AndroidManifest.xml
@@ -0,0 +1,23 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/android/hello_world/app/src/main/java/com/example/helloworld/MainActivity.java b/android/hello_world/app/src/main/java/com/example/helloworld/MainActivity.java
new file mode 100644
index 0000000..95b8780
--- /dev/null
+++ b/android/hello_world/app/src/main/java/com/example/helloworld/MainActivity.java
@@ -0,0 +1,13 @@
+package com.example.helloworld;
+
+import android.os.Bundle;
+import androidx.appcompat.app.AppCompatActivity;
+
+public class MainActivity extends AppCompatActivity {
+
+ @Override
+ protected void onCreate(Bundle savedInstanceState) {
+ super.onCreate(savedInstanceState);
+ setContentView(R.layout.activity_main);
+ }
+}
diff --git a/android/hello_world/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/android/hello_world/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
new file mode 100644
index 0000000..2b068d1
--- /dev/null
+++ b/android/hello_world/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -0,0 +1,30 @@
+
+
+
+
+