NUC-11: Add Android application. Grpc is working!

NucuHub.Android/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx

NucuHub.Android/app/.gitignore

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+/build

NucuHub.Android/app/build.gradle

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+apply plugin: 'com.android.application'
+apply plugin: 'com.google.protobuf'
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.2"
+
+    defaultConfig {
+        applicationId "dev.nuculabs.nucuhub"
+        minSdkVersion 29
+        targetSdkVersion 30
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+protobuf {
+    protoc { artifact = 'com.google.protobuf:protoc:3.12.0' }
+    plugins {
+        grpc { artifact = 'io.grpc:protoc-gen-grpc-java:1.33.1' // CURRENT_GRPC_VERSION
+        }
+    }
+    generateProtoTasks {
+        all().each { task ->
+            task.builtins {
+                java { option 'lite' }
+            }
+            task.plugins {
+                grpc { // Options added to --grpc_out
+                    option 'lite' }
+            }
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: "libs", include: ["*.jar"])
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
+    implementation 'com.google.android.material:material:1.0.0'
+    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'androidx.navigation:navigation-fragment:2.1.0'
+    implementation 'androidx.navigation:navigation-ui:2.1.0'
+    implementation 'androidx.lifecycle:lifecycle-extensions:2.1.0'
+    testImplementation 'junit:junit:4.12'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    // You need to build grpc-java to obtain these libraries below.
+    implementation 'io.grpc:grpc-okhttp:1.33.1' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-protobuf-lite:1.33.1' // CURRENT_GRPC_VERSION
+    implementation 'io.grpc:grpc-stub:1.33.1' // CURRENT_GRPC_VERSION
+    compileOnly 'org.apache.tomcat:annotations-api:6.0.53' // necessary for Java 9+
+
+}

NucuHub.Android/app/proguard-rules.pro

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+# 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

NucuHub.Android/app/src/androidTest/java/dev/nuculabs/nucuhub/ExampleInstrumentedTest.java

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+package dev.nuculabs.nucuhub;
+
+import android.content.Context;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented 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() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("dev.nuculabs.nucuhub", appContext.getPackageName());
+    }
+}

NucuHub.Android/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="dev.nuculabs.nucuhub">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <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"
+                android:label="@string/app_name"
+                android:theme="@style/AppTheme.NoActionBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

NucuHub.Android/app/src/main/java/dev/nuculabs/grpc/EnvironmentSensorData.java

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+package dev.nuculabs.grpc;
+
+import NucuCarSensorsProto.NucuCarSensors;
+import android.util.Log;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+public class EnvironmentSensorData {
+    @SuppressWarnings("FieldCanBeLocal")
+    private final String TAG = EnvironmentSensorData.class.getName();
+    private double temperature;
+    private double humidity;
+    private double pressure;
+    private double volatileOrganicCompounds;
+    private NucuCarSensors.SensorStateEnum sensorState;
+
+    public EnvironmentSensorData(String data, NucuCarSensors.SensorStateEnum state) {
+        try {
+            JSONObject json = new JSONObject(data);
+            temperature = json.getDouble("Temperature");
+            humidity = json.getDouble("Humidity");
+            pressure = json.getDouble("Pressure");
+            volatileOrganicCompounds = json.getDouble("VolatileOrganicCompounds");
+            sensorState = state;
+        } catch (JSONException e) {
+            Log.e(TAG, e.getLocalizedMessage());
+            temperature = -1;
+            humidity = -1;
+            pressure = -1;
+            volatileOrganicCompounds = -1;
+            sensorState = NucuCarSensors.SensorStateEnum.Error;
+        }
+    }
+
+    public NucuCarSensors.SensorStateEnum getSensorState() {
+        return sensorState;
+    }
+
+    public double getTemperature() {
+        return temperature;
+    }
+
+    public double getHumidity() {
+        return humidity;
+    }
+
+    public double getPressure() {
+        return pressure;
+    }
+
+    public double getVolatileOrganicCompounds() {
+        return volatileOrganicCompounds;
+    }
+}

NucuHub.Android/app/src/main/java/dev/nuculabs/grpc/EnvironmentSensorService.java

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+package dev.nuculabs.grpc;
+
+import NucuCarSensorsProto.EnvironmentSensorGrpcServiceGrpc;
+import NucuCarSensorsProto.NucuCarSensors;
+import android.util.Log;
+import io.grpc.ManagedChannel;
+import io.grpc.ManagedChannelBuilder;
+import io.grpc.StatusRuntimeException;
+
+import java.util.Locale;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+
+import static java.util.concurrent.TimeUnit.SECONDS;
+
+
+public class EnvironmentSensorService {
+    private final String TAG = EnvironmentSensorService.class.getName();
+    private final ManagedChannel channel;
+    private final EnvironmentSensorGrpcServiceGrpc.EnvironmentSensorGrpcServiceBlockingStub blockingStub;
+    private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
+    private ScheduledFuture<?> periodicGrpcRequestHandle = null;
+    private EnvironmentSensorData lastMeasurementData = new EnvironmentSensorData("{}", NucuCarSensors.SensorStateEnum.Uninitialized);
+
+    public EnvironmentSensorService(String host, int port) {
+        this(ManagedChannelBuilder.forAddress(host, port).usePlaintext());
+        Log.i(TAG, String.format(Locale.ENGLISH, "Initializing channel host=%s port=%d", host, port));
+    }
+
+    public EnvironmentSensorService(ManagedChannelBuilder<?> channelBuilder) {
+        channel = channelBuilder.build();
+        blockingStub = EnvironmentSensorGrpcServiceGrpc.newBlockingStub(channel);
+    }
+
+    public void start() {
+        final Runnable grpcPoolingTask = new Runnable() {
+            public void run() {
+                lastMeasurementData = getMeasurement();
+            }
+        };
+        periodicGrpcRequestHandle = scheduler.scheduleAtFixedRate(grpcPoolingTask, 5, 10, SECONDS);
+    }
+
+    public void stop() {
+        periodicGrpcRequestHandle.cancel(true);
+    }
+
+    public EnvironmentSensorData getLastMeasurementData() {
+        return lastMeasurementData;
+    }
+
+    private EnvironmentSensorData getMeasurement() {
+        try {
+            NucuCarSensors.NucuCarSensorResponse response = null;
+            response = blockingStub.getMeasurement(null);
+            Log.d(TAG, "getMeasurement " + response.getJsonData());
+            return new EnvironmentSensorData(response.getJsonData(), response.getState());
+        } catch (StatusRuntimeException e) {
+            Log.e(TAG, e.getLocalizedMessage());
+            return new EnvironmentSensorData("{}", NucuCarSensors.SensorStateEnum.Error);
+        }
+    }
+}

NucuHub.Android/app/src/main/java/dev/nuculabs/nucuhub/MainActivity.java

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+package dev.nuculabs.nucuhub;
+
+import android.os.Bundle;
+import android.view.Menu;
+import com.google.android.material.navigation.NavigationView;
+import androidx.navigation.NavController;
+import androidx.navigation.Navigation;
+import androidx.navigation.ui.AppBarConfiguration;
+import androidx.navigation.ui.NavigationUI;
+import androidx.drawerlayout.widget.DrawerLayout;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.Toolbar;
+
+public class MainActivity extends AppCompatActivity {
+
+    private AppBarConfiguration mAppBarConfiguration;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        Toolbar toolbar = findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+
+        DrawerLayout drawer = findViewById(R.id.drawer_layout);
+        NavigationView navigationView = findViewById(R.id.nav_view);
+        // Passing each menu ID as a set of Ids because each
+        // menu should be considered as top level destinations.
+        mAppBarConfiguration = new AppBarConfiguration.Builder(
+                R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow)
+                .setDrawerLayout(drawer)
+                .build();
+
+        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
+        NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
+        NavigationUI.setupWithNavController(navigationView, navController);
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        // Inflate the menu; this adds items to the action bar if it is present.
+        getMenuInflater().inflate(R.menu.main, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onSupportNavigateUp() {
+        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
+        return NavigationUI.navigateUp(navController, mAppBarConfiguration)
+                || super.onSupportNavigateUp();
+    }
+}

NucuHub.Android/app/src/main/java/dev/nuculabs/nucuhub/ui/gallery/GalleryFragment.java

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+package dev.nuculabs.nucuhub.ui.gallery;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.lifecycle.Observer;
+import androidx.lifecycle.ViewModelProviders;
+import dev.nuculabs.nucuhub.R;
+
+public class GalleryFragment extends Fragment {
+
+    private GalleryViewModel galleryViewModel;
+
+    public View onCreateView(@NonNull LayoutInflater inflater,
+                             ViewGroup container, Bundle savedInstanceState) {
+        galleryViewModel =
+                ViewModelProviders.of(this).get(GalleryViewModel.class);
+        View root = inflater.inflate(R.layout.fragment_gallery, container, false);
+        final TextView textView = root.findViewById(R.id.text_gallery);
+        galleryViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
+            @Override
+            public void onChanged(@Nullable String s) {
+                textView.setText(s);
+            }
+        });
+        return root;
+    }
+}

NucuHub.Android/app/src/main/java/dev/nuculabs/nucuhub/ui/gallery/GalleryViewModel.java

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+package dev.nuculabs.nucuhub.ui.gallery;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+public class GalleryViewModel extends ViewModel {
+
+    private MutableLiveData<String> mText;
+
+    public GalleryViewModel() {
+        mText = new MutableLiveData<>();
+        mText.setValue("This is gallery fragment");
+    }
+
+    public LiveData<String> getText() {
+        return mText;
+    }
+}

NucuHub.Android/app/src/main/java/dev/nuculabs/nucuhub/ui/sensors/EnvironmentSensorViewModel.java

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+package dev.nuculabs.nucuhub.ui.sensors;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+import dev.nuculabs.nucuhub.R;
+
+public class EnvironmentSensorViewModel extends ViewModel {
+
+    private MutableLiveData<String> sensorStatusImageTooltip;
+    private MutableLiveData<Integer> sensorStatusImageResourceId;
+
+    public EnvironmentSensorViewModel() {
+        sensorStatusImageResourceId = new MutableLiveData<>();
+        sensorStatusImageResourceId.setValue(R.drawable.no_signal);
+        sensorStatusImageTooltip = new MutableLiveData<>();
+    }
+
+    public LiveData<Integer> getSensorStatusImageResourceId() {
+        return sensorStatusImageResourceId;
+    }
+
+    public LiveData<String> getSensorStatusImageTooltip() {
+        Integer sensorStatusImageResourceId = this.sensorStatusImageResourceId.getValue();
+        if (sensorStatusImageResourceId == null) {
+            sensorStatusImageResourceId = -1;
+        }
+
+        switch (sensorStatusImageResourceId) {
+            case R.drawable.status_good:
+                sensorStatusImageTooltip.setValue("The air quality is good.");
+            case R.drawable.status_netural:
+                sensorStatusImageTooltip.setValue("The air quality is not great, not terrible.");
+            case R.drawable.status_bad:
+                sensorStatusImageTooltip.setValue("The air quality is bad.");
+            case R.drawable.no_signal:
+            default:
+                sensorStatusImageTooltip.setValue("No signal. Please ensure device is connected!");
+                break;
+        }
+        return sensorStatusImageTooltip;
+    }
+}

NucuHub.Android/app/src/main/java/dev/nuculabs/nucuhub/ui/sensors/SensorsFragment.java

@@ -0,0 +1,59 @@
+package dev.nuculabs.nucuhub.ui.sensors;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.ImageView;
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.lifecycle.Observer;
+import androidx.lifecycle.ViewModelProviders;
+import dev.nuculabs.grpc.EnvironmentSensorService;
+import dev.nuculabs.nucuhub.R;
+
+import java.util.logging.Logger;
+
+public class SensorsFragment extends Fragment {
+    private static final Logger logger = Logger.getLogger(SensorsFragment.class.getName());
+    private View root;
+    private EnvironmentSensorViewModel environmentSensorViewModel;
+
+    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        environmentSensorViewModel = ViewModelProviders.of(this).get(EnvironmentSensorViewModel.class);
+        root = inflater.inflate(R.layout.fragment_environment_sensor, container, false);
+
+        // test button TODO: Investigate lifecycle methods and stop/start the scheduler accordingly.
+        Button testButton = root.findViewById(R.id.grpc_test_button);
+        final EnvironmentSensorService client = new EnvironmentSensorService("192.168.0.101", 8000);
+        client.start();
+        testButton.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+                logger.info("test button clicked!");
+                client.stop();
+            }
+        });
+
+        setupSensorStatusImage();
+        return root;
+    }
+
+
+    private void setupSensorStatusImage() {
+        // Dynamically observe the image of the sensor status image view.
+        final ImageView sensorStatusImageView = root.findViewById(R.id.sensorStatusImageView);
+        environmentSensorViewModel.getSensorStatusImageResourceId().observe(getViewLifecycleOwner(), new Observer<Integer>() {
+            @Override
+            public void onChanged(Integer resourceId) {
+                sensorStatusImageView.setImageResource(resourceId);
+            }
+        });
+        environmentSensorViewModel.getSensorStatusImageTooltip().observe(getViewLifecycleOwner(), new Observer<String>() {
+            @Override
+            public void onChanged(String tooltip) {
+                sensorStatusImageView.setTooltipText(tooltip);
+            }
+        });
+    }
+}

NucuHub.Android/app/src/main/java/dev/nuculabs/nucuhub/ui/slideshow/SlideshowFragment.java

@@ -0,0 +1,33 @@
+package dev.nuculabs.nucuhub.ui.slideshow;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.lifecycle.Observer;
+import androidx.lifecycle.ViewModelProviders;
+import dev.nuculabs.nucuhub.R;
+
+public class SlideshowFragment extends Fragment {
+
+    private SlideshowViewModel slideshowViewModel;
+
+    public View onCreateView(@NonNull LayoutInflater inflater,
+                             ViewGroup container, Bundle savedInstanceState) {
+        slideshowViewModel =
+                ViewModelProviders.of(this).get(SlideshowViewModel.class);
+        View root = inflater.inflate(R.layout.fragment_slideshow, container, false);
+        final TextView textView = root.findViewById(R.id.text_slideshow);
+        slideshowViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
+            @Override
+            public void onChanged(@Nullable String s) {
+                textView.setText(s);
+            }
+        });
+        return root;
+    }
+}

NucuHub.Android/app/src/main/java/dev/nuculabs/nucuhub/ui/slideshow/SlideshowViewModel.java

@@ -0,0 +1,19 @@
+package dev.nuculabs.nucuhub.ui.slideshow;
+
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.ViewModel;
+
+public class SlideshowViewModel extends ViewModel {
+
+    private MutableLiveData<String> mText;
+
+    public SlideshowViewModel() {
+        mText = new MutableLiveData<>();
+        mText.setValue("This is slideshow fragment");
+    }
+
+    public LiveData<String> getText() {
+        return mText;
+    }
+}

NucuHub.Android/app/src/main/proto/NucuCarSensors.proto

@@ -0,0 +1,29 @@
+syntax = "proto3";
+import "google/protobuf/empty.proto";
+
+package NucuCarSensorsProto;
+
+// General
+enum SensorStateEnum {
+    Error = 0;
+    Uninitialized = 1;
+    Initialized = 2;
+    Disabled = 3;
+    GrpcDisabled = 4;
+}
+
+// Environment Sensor
+service EnvironmentSensorGrpcService {
+    rpc GetMeasurement(google.protobuf.Empty) returns (NucuCarSensorResponse) {}
+}
+
+// Health Sensor
+service HealthSensorGrpcService {
+    rpc GetCpuTemperature(google.protobuf.Empty) returns (NucuCarSensorResponse) {}
+}
+
+// Responses
+message NucuCarSensorResponse {
+    SensorStateEnum State = 1;
+    string JsonData = 2;
+}

NucuHub.Android/app/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,31 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:aapt="http://schemas.android.com/aapt"
+        android:width="108dp"
+        android:height="108dp"
+        android:viewportWidth="108"
+        android:viewportHeight="108">
+    <path
+            android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                    android:startY="49.59793"
+                    android:startX="42.9492"
+                    android:endY="92.4963"
+                    android:endX="85.84757"
+                    android:type="linear">
+                <item
+                        android:color="#44000000"
+                        android:offset="0.0"/>
+                <item
+                        android:color="#00000000"
+                        android:offset="1.0"/>
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+            android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+            android:fillColor="#FFFFFF"
+            android:fillType="nonZero"
+            android:strokeWidth="1"
+            android:strokeColor="#00000000"/>
+</vector>

NucuHub.Android/app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        android:height="108dp"
+        android:width="108dp"
+        android:viewportHeight="108"
+        android:viewportWidth="108">
+    <path android:fillColor="#3DDC84"
+          android:pathData="M0,0h108v108h-108z"/>
+    <path android:fillColor="#00000000" android:pathData="M9,0L9,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M19,0L19,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M29,0L29,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M39,0L39,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M49,0L49,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M59,0L59,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M69,0L69,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M79,0L79,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M89,0L89,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M99,0L99,108"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M0,9L108,9"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M0,19L108,19"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M0,29L108,29"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M0,39L108,39"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M0,49L108,49"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M0,59L108,59"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M0,69L108,69"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M0,79L108,79"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M0,89L108,89"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M0,99L108,99"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M19,29L89,29"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M19,39L89,39"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M19,49L89,49"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M19,59L89,59"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M19,69L89,69"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M19,79L89,79"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M29,19L29,89"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M39,19L39,89"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M49,19L49,89"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M59,19L59,89"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M69,19L69,89"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+    <path android:fillColor="#00000000" android:pathData="M79,19L79,89"
+          android:strokeColor="#33FFFFFF" android:strokeWidth="0.8"/>
+</vector>

NucuHub.Android/app/src/main/res/drawable/ic_menu_camera.xml

@@ -0,0 +1,12 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+            android:fillColor="#FF000000"
+            android:pathData="M12,12m-3.2,0a3.2,3.2 0,1 1,6.4 0a3.2,3.2 0,1 1,-6.4 0"/>
+    <path
+            android:fillColor="#FF000000"
+            android:pathData="M9,2L7.17,4H4c-1.1,0 -2,0.9 -2,2v12c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2V6c0,-1.1 -0.9,-2 -2,-2h-3.17L15,2H9zm3,15c-2.76,0 -5,-2.24 -5,-5s2.24,-5 5,-5 5,2.24 5,5 -2.24,5 -5,5z"/>
+</vector>

NucuHub.Android/app/src/main/res/drawable/ic_menu_gallery.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+            android:fillColor="#FF000000"
+            android:pathData="M22,16V4c0,-1.1 -0.9,-2 -2,-2H8c-1.1,0 -2,0.9 -2,2v12c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2zm-11,-4l2.03,2.71L16,11l4,5H8l3,-4zM2,6v14c0,1.1 0.9,2 2,2h14v-2H4V6H2z"/>
+</vector>

NucuHub.Android/app/src/main/res/drawable/ic_menu_slideshow.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+            android:fillColor="#FF000000"
+            android:pathData="M4,6H2v14c0,1.1 0.9,2 2,2h14v-2H4V6zm16,-4H8c-1.1,0 -2,0.9 -2,2v12c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2V4c0,-1.1 -0.9,-2 -2,-2zm-8,12.5v-9l6,4.5 -6,4.5z"/>
+</vector>

NucuHub.Android/app/src/main/res/drawable/side_nav_bar.xml

@@ -0,0 +1,9 @@
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+       android:shape="rectangle">
+    <gradient
+            android:angle="135"
+            android:centerColor="#009688"
+            android:endColor="#00695C"
+            android:startColor="#4DB6AC"
+            android:type="linear"/>
+</shape>

NucuHub.Android/app/src/main/res/layout/activity_main.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.drawerlayout.widget.DrawerLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:id="@+id/drawer_layout"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:fitsSystemWindows="true"
+        tools:openDrawer="start">
+
+    <include
+            layout="@layout/app_bar_main"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"/>
+
+    <com.google.android.material.navigation.NavigationView
+            android:id="@+id/nav_view"
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:layout_gravity="start"
+            android:fitsSystemWindows="true"
+            app:headerLayout="@layout/nav_header_main"
+            app:menu="@menu/activity_main_drawer"/>
+</androidx.drawerlayout.widget.DrawerLayout>

NucuHub.Android/app/src/main/res/layout/app_bar_main.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.coordinatorlayout.widget.CoordinatorLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context=".MainActivity">
+
+    <com.google.android.material.appbar.AppBarLayout
+            android:layout_height="wrap_content"
+            android:layout_width="match_parent"
+            android:theme="@style/AppTheme.AppBarOverlay">
+
+        <androidx.appcompat.widget.Toolbar
+                android:id="@+id/toolbar"
+                android:layout_width="match_parent"
+                android:layout_height="?attr/actionBarSize"
+                android:background="?attr/colorPrimary"
+                app:popupTheme="@style/AppTheme.PopupOverlay"/>
+
+    </com.google.android.material.appbar.AppBarLayout>
+
+    <include layout="@layout/content_main"/>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

NucuHub.Android/app/src/main/res/layout/content_main.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:layout_behavior="@string/appbar_scrolling_view_behavior"
+        tools:showIn="@layout/app_bar_main">
+
+    <fragment
+            android:id="@+id/nav_host_fragment"
+            android:name="androidx.navigation.fragment.NavHostFragment"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            app:layout_constraintLeft_toLeftOf="parent"
+            app:layout_constraintRight_toRightOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            app:defaultNavHost="true"
+            app:navGraph="@navigation/mobile_navigation"
+    />
+</androidx.constraintlayout.widget.ConstraintLayout>

NucuHub.Android/app/src/main/res/layout/fragment_environment_sensor.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context=".ui.sensors.SensorsFragment">
+    <ImageView
+            android:layout_width="272dp"
+            android:layout_height="268dp" tools:src="@tools:sample/avatars" android:id="@+id/sensorStatusImageView"
+            android:layout_marginEnd="70dp"
+            app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent"
+            android:layout_marginStart="70dp"
+            android:contentDescription="@string/environment_status_description"
+            app:layout_constraintBottom_toBottomOf="parent" android:layout_marginBottom="376dp"
+            android:background="#00FFFFFF"
+            app:layout_constraintHorizontal_bias="1.0" app:layout_constraintTop_toTopOf="parent"
+            android:tooltipText="what is this amaaaizng"
+            android:layout_marginTop="90dp" app:srcCompat="@drawable/status_netural"
+            tools:srcCompat="@drawable/status_netural"/>
+    <Button
+            android:text="Button"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content" android:id="@+id/grpc_test_button"
+            app:layout_constraintStart_toStartOf="parent" android:layout_marginStart="161dp"
+            android:layout_marginEnd="162dp" app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintBottom_toBottomOf="parent" android:layout_marginBottom="106dp"
+            android:layout_marginTop="221dp" app:layout_constraintTop_toBottomOf="@+id/sensorStatusImageView"/>
+</androidx.constraintlayout.widget.ConstraintLayout>

NucuHub.Android/app/src/main/res/layout/fragment_gallery.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context=".ui.gallery.GalleryFragment">
+
+    <TextView
+            android:id="@+id/text_gallery"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="8dp"
+            android:layout_marginTop="8dp"
+            android:layout_marginEnd="8dp"
+            android:textAlignment="center"
+            android:textSize="20sp"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            app:layout_constraintBottom_toBottomOf="parent"/>
+</androidx.constraintlayout.widget.ConstraintLayout>

NucuHub.Android/app/src/main/res/layout/fragment_slideshow.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        tools:context=".ui.slideshow.SlideshowFragment">
+
+    <TextView
+            android:id="@+id/text_slideshow"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="8dp"
+            android:layout_marginTop="8dp"
+            android:layout_marginEnd="8dp"
+            android:textAlignment="center"
+            android:textSize="20sp"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            app:layout_constraintBottom_toBottomOf="parent"/>
+</androidx.constraintlayout.widget.ConstraintLayout>

NucuHub.Android/app/src/main/res/layout/nav_header_main.xml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+        xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
+        android:layout_width="match_parent"
+        android:layout_height="@dimen/nav_header_height"
+        android:background="@drawable/side_nav_bar"
+        android:paddingBottom="@dimen/activity_vertical_margin"
+        android:paddingLeft="@dimen/activity_horizontal_margin"
+        android:paddingRight="@dimen/activity_horizontal_margin"
+        android:paddingTop="@dimen/activity_vertical_margin"
+        android:theme="@style/ThemeOverlay.AppCompat.Dark"
+        android:orientation="vertical"
+        android:gravity="bottom">
+
+    <ImageView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:paddingTop="@dimen/nav_header_vertical_spacing"
+            app:srcCompat="@mipmap/ic_launcher_round"
+            android:contentDescription="@string/nav_header_desc"
+            android:id="@+id/imageView"/>
+
+    <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingTop="@dimen/nav_header_vertical_spacing"
+            android:text="@string/nav_header_title"
+            android:textAppearance="@style/TextAppearance.AppCompat.Body1"/>
+
+    <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/nav_header_subtitle"
+            android:id="@+id/textView"/>
+</LinearLayout>

NucuHub.Android/app/src/main/res/menu/activity_main_drawer.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:tools="http://schemas.android.com/tools"
+      tools:showIn="navigation_view">
+
+    <group android:checkableBehavior="single">
+        <item
+                android:id="@+id/nav_home"
+                android:icon="@drawable/ic_menu_camera"
+                android:title="@string/menu_home"/>
+        <item
+                android:id="@+id/nav_gallery"
+                android:icon="@drawable/ic_menu_gallery"
+                android:title="@string/menu_gallery"/>
+        <item
+                android:id="@+id/nav_slideshow"
+                android:icon="@drawable/ic_menu_slideshow"
+                android:title="@string/menu_slideshow"/>
+    </group>
+</menu>

NucuHub.Android/app/src/main/res/menu/main.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+      xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item android:id="@+id/action_settings"
+          android:title="@string/action_settings"
+          android:orderInCategory="100"
+          app:showAsAction="never"/>
+</menu>

NucuHub.Android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>

NucuHub.Android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>

NucuHub.Android/app/src/main/res/navigation/mobile_navigation.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<navigation xmlns:android="http://schemas.android.com/apk/res/android"
+            xmlns:app="http://schemas.android.com/apk/res-auto"
+            xmlns:tools="http://schemas.android.com/tools"
+            android:id="@+id/mobile_navigation"
+            app:startDestination="@+id/nav_home">
+
+    <fragment
+            android:id="@+id/nav_home"
+            android:name="dev.nuculabs.nucuhub.ui.sensors.SensorsFragment"
+            android:label="@string/menu_home"
+            tools:layout="@layout/fragment_environment_sensor"/>
+
+    <fragment
+            android:id="@+id/nav_gallery"
+            android:name="dev.nuculabs.nucuhub.ui.gallery.GalleryFragment"
+            android:label="@string/menu_gallery"
+            tools:layout="@layout/fragment_gallery"/>
+
+    <fragment
+            android:id="@+id/nav_slideshow"
+            android:name="dev.nuculabs.nucuhub.ui.slideshow.SlideshowFragment"
+            android:label="@string/menu_slideshow"
+            tools:layout="@layout/fragment_slideshow"/>
+</navigation>

NucuHub.Android/app/src/main/res/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#6200EE</color>
+    <color name="colorPrimaryDark">#3700B3</color>
+    <color name="colorAccent">#03DAC5</color>
+</resources>

NucuHub.Android/app/src/main/res/values/dimens.xml

@@ -0,0 +1,8 @@
+<resources>
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="activity_horizontal_margin">16dp</dimen>
+    <dimen name="activity_vertical_margin">16dp</dimen>
+    <dimen name="nav_header_vertical_spacing">8dp</dimen>
+    <dimen name="nav_header_height">176dp</dimen>
+    <dimen name="fab_margin">16dp</dimen>
+</resources>

NucuHub.Android/app/src/main/res/values/strings.xml

@@ -0,0 +1,14 @@
+<resources>
+    <string name="app_name">NucuHub</string>
+    <string name="environment_status_description">Temperature sensor status</string>
+    <string name="navigation_drawer_open">Open navigation drawer</string>
+    <string name="navigation_drawer_close">Close navigation drawer</string>
+    <string name="nav_header_title">Android Studio</string>
+    <string name="nav_header_subtitle">android.studio@android.com</string>
+    <string name="nav_header_desc">Navigation header</string>
+    <string name="action_settings">Settings</string>
+
+    <string name="menu_home">Home</string>
+    <string name="menu_gallery">Gallery</string>
+    <string name="menu_slideshow">Slideshow</string>
+</resources>

NucuHub.Android/app/src/main/res/values/styles.xml

@@ -0,0 +1,16 @@
+<resources>
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+    </style>
+    <style name="AppTheme.NoActionBar">
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+    </style>
+    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar"/>
+    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light"/>
+
+</resources>

NucuHub.Android/app/src/test/java/dev/nuculabs/nucuhub/ExampleUnitTest.java

@@ -0,0 +1,17 @@
+package dev.nuculabs.nucuhub;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+}

NucuHub.Android/build.gradle

@@ -0,0 +1,28 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath "com.android.tools.build:gradle:4.0.0"
+        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.13"
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        jcenter()
+        // Some grpc-java releases may be missing in JCenter.
+        // See https://github.com/grpc/grpc-java/issues/5782
+        mavenCentral()
+        mavenLocal()
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

NucuHub.Android/gradle.properties

@@ -0,0 +1,19 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app"s APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true

NucuHub.Android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Sat Nov 21 15:56:16 EET 2020
+distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip
+distributionPath=wrapper/dists
+zipStorePath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME

NucuHub.Android/gradlew

@@ -0,0 +1,172 @@
+#!/usr/bin/env sh
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS=""
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"

NucuHub.Android/gradlew.bat

@@ -0,0 +1,84 @@
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

NucuHub.Android/settings.gradle

@@ -0,0 +1,2 @@
+include ':app'
+rootProject.name = "NucuHub"