v0.01

app/.gitignore

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+/build

app/build.gradle

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+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.2"
+
+    defaultConfig {
+        applicationId "it.danieleverducci.ojo"
+        minSdkVersion 17
+        targetSdkVersion 30
+        versionCode 1
+        versionName "0.0.1"
+
+        vectorDrawables.useSupportLibrary = true
+
+        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
+    }
+    buildFeatures {
+        viewBinding true
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'com.google.android.material:material:1.4.0'
+    implementation 'androidx.navigation:navigation-fragment:2.3.5'
+    implementation 'androidx.navigation:navigation-ui:2.3.5'
+    implementation 'org.videolan.android:libvlc-all:3.4.1'
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+}

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

app/src/androidTest/java/it/danieleverducci/ojo/ExampleInstrumentedTest.java

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+package it.danieleverducci.ojo;
+
+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("it.danieleverducci.ojo", 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="it.danieleverducci.ojo">
+
+    <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/Theme.Ojo">
+        <activity
+            android:name=".ui.MainActivity"
+            android:label="@string/app_name"
+            android:theme="@style/Theme.Ojo"
+            android:screenOrientation="landscape">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/it/danieleverducci/ojo/Settings.java

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+package it.danieleverducci.ojo;
+
+import android.content.Context;
+import android.util.Log;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+import it.danieleverducci.ojo.entities.Camera;
+
+/**
+ * Manages the settings persistence
+ */
+public class Settings implements Serializable {
+    private static final String FILENAME = "settings.bin";
+    private static final String TAG = "Settings";
+
+    private volatile String settingsFilePath;
+    private List<Camera> cameras = new ArrayList<>();
+
+    public static Settings fromDisk(Context context) {
+        String filePath = context.getFilesDir() + File.separator + FILENAME;
+        Settings s = new Settings();
+        try {
+            FileInputStream fin = new FileInputStream(filePath);
+            ObjectInputStream ois = new ObjectInputStream(fin);
+            s = (Settings) ois.readObject();
+        } catch (FileNotFoundException e) {
+            Log.d(TAG, "No saved settings found, will create a new one");
+        } catch (IOException e) {
+            Log.e(TAG, "Unable to load settings from disk: " + e.toString());
+        } catch (ClassNotFoundException e) {
+            Log.e(TAG, e.toString());
+        }
+        s.settingsFilePath = filePath;
+        return s;
+    }
+
+    public List<Camera> getCameras() {
+        return cameras;
+    }
+
+    public void setCameras(List<Camera> cameras) {
+        this.cameras = cameras;
+    }
+
+    public void addCamera(Camera camera) {
+        this.cameras.add(camera);
+    }
+
+    public boolean save() {
+        try {
+            FileOutputStream fout = new FileOutputStream(settingsFilePath);
+            ObjectOutputStream oos = new ObjectOutputStream(fout);
+            oos.writeObject(this);
+            fout.close();
+            oos.close();
+            return true;
+        } catch (FileNotFoundException e) {
+            Log.e(TAG, "Unable to create file " + settingsFilePath + ": " + e.toString());
+        } catch (IOException e) {
+            Log.e(TAG, "Unable to save settings: " + e.toString());
+        }
+        return false;
+    }
+}

app/src/main/java/it/danieleverducci/ojo/entities/Camera.java

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+package it.danieleverducci.ojo.entities;
+
+import java.io.Serializable;
+
+public class Camera implements Serializable {
+    private String name;
+    private String rtspUrl;
+
+    public Camera(String name, String rtspUrl) {
+        this.name = name;
+        this.rtspUrl = rtspUrl;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getRtspUrl() {
+        return rtspUrl;
+    }
+}

app/src/main/java/it/danieleverducci/ojo/ui/AddStreamFragment.java

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+package it.danieleverducci.ojo.ui;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.navigation.fragment.NavHostFragment;
+
+import com.google.android.material.snackbar.Snackbar;
+
+import it.danieleverducci.ojo.R;
+import it.danieleverducci.ojo.Settings;
+import it.danieleverducci.ojo.databinding.FragmentAddStreamBinding;
+import it.danieleverducci.ojo.entities.Camera;
+
+public class AddStreamFragment extends Fragment {
+
+    private FragmentAddStreamBinding binding;
+
+    @Override
+    public View onCreateView(
+            LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState
+    ) {
+
+        binding = FragmentAddStreamBinding.inflate(inflater, container, false);
+        return binding.getRoot();
+
+    }
+
+    public void onViewCreated(@NonNull View view, Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+
+        binding.save.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                // Check the field is filled
+                String url = binding.streamUrl.getText().toString();
+                if (!(url.startsWith("rtsp://") || url.startsWith("http://"))) {
+                    Snackbar.make(view, R.string.add_stream_invalid_url, Snackbar.LENGTH_LONG)
+                        .setAction(R.string.add_stream_invalid_url_dismiss, null).show();
+                    return;
+                }
+
+                // Load existing settings (if any)
+                Settings settings = Settings.fromDisk(getContext());
+                // Add stream to list
+                settings.addCamera(new Camera("", url));
+                // Save
+                if (!settings.save()) {
+                    Snackbar.make(view, R.string.add_stream_error_saving, Snackbar.LENGTH_LONG).show();
+                    return;
+                }
+
+                // Back to first fragment
+                NavHostFragment.findNavController(AddStreamFragment.this)
+                        .navigate(R.id.action_SecondFragment_to_FirstFragment);
+            }
+        });
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        binding = null;
+    }
+
+}

app/src/main/java/it/danieleverducci/ojo/ui/MainActivity.java

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+package it.danieleverducci.ojo.ui;
+
+import android.os.Bundle;
+
+import com.google.android.material.snackbar.Snackbar;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.view.View;
+
+import androidx.navigation.NavController;
+import androidx.navigation.Navigation;
+import androidx.navigation.ui.AppBarConfiguration;
+import androidx.navigation.ui.NavigationUI;
+
+import it.danieleverducci.ojo.R;
+import it.danieleverducci.ojo.databinding.ActivityMainBinding;
+
+import android.view.Menu;
+import android.view.MenuItem;
+
+public class MainActivity extends AppCompatActivity {
+
+    private ActivityMainBinding binding;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        binding = ActivityMainBinding.inflate(getLayoutInflater());
+        setContentView(binding.getRoot());
+
+        // Show FAB only on first fragment
+        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
+        navController.addOnDestinationChangedListener((controller, destination, arguments) -> {
+            if (destination.getId() == R.id.FirstFragment)
+                binding.fab.show();
+            else
+                binding.fab.hide();
+        });
+
+        binding.fab.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                navController.navigate(R.id.action_FirstFragment_to_SecondFragment);
+            }
+        });
+    }
+}

app/src/main/java/it/danieleverducci/ojo/ui/SurveillanceFragment.java

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+package it.danieleverducci.ojo.ui;
+
+import android.content.Context;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.SurfaceHolder;
+import android.view.SurfaceView;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.ViewTreeObserver;
+import android.view.Window;
+import android.view.WindowInsets;
+import android.view.WindowInsetsController;
+import android.widget.LinearLayout;
+
+import androidx.fragment.app.Fragment;
+
+import org.videolan.libvlc.interfaces.IVLCVout;
+import org.videolan.libvlc.LibVLC;
+import org.videolan.libvlc.Media;
+import org.videolan.libvlc.MediaPlayer;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import it.danieleverducci.ojo.R;
+import it.danieleverducci.ojo.Settings;
+import it.danieleverducci.ojo.databinding.FragmentSurveillanceBinding;
+import it.danieleverducci.ojo.entities.Camera;
+import it.danieleverducci.ojo.utils.DpiUtils;
+
+/**
+ * Some streams to test:
+ * rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov
+ * rtsp://demo:demo@ipvmdemo.dyndns.org:5541/onvif-media/media.amp?profile=profile_1_h264&sessiontimeout=60&streamtype=unicast
+ */
+public class SurveillanceFragment extends Fragment {
+
+    final static private String TAG = "SurveillanceFragment";
+    final static private String[] VLC_OPTIONS = new String[]{
+            "--aout=opensles",
+            //"--audio-time-stretch", // time stretching
+            //"-vvv", // verbosity
+            "--avcodec-codec=h264",
+            //"--file-logging",
+            //"--logfile=vlc-log.txt"
+    };
+
+    private FragmentSurveillanceBinding binding;
+    private List<CameraView> cameraViews = new ArrayList<>();
+    int viewMargin;
+
+    @Override
+    public View onCreateView(
+            LayoutInflater inflater, ViewGroup container,
+            Bundle savedInstanceState
+    ) {
+        viewMargin = DpiUtils.DpToPixels(container.getContext(), 2);
+
+        binding = FragmentSurveillanceBinding.inflate(inflater, container, false);
+        return binding.getRoot();
+
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        // Leanback mode (fullscreen)
+        Window window = getActivity().getWindow();
+        if (window != null) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+                final WindowInsetsController controller = window.getInsetsController();
+
+                if (controller != null)
+                    controller.hide(WindowInsets.Type.statusBars());
+            } else {
+                window.getDecorView().setSystemUiVisibility(
+                        View.SYSTEM_UI_FLAG_FULLSCREEN
+                                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                                | View.SYSTEM_UI_FLAG_IMMERSIVE
+                                | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);
+            }
+        }
+
+        addAllCameras();
+
+        // Start playback for all streams
+        for (CameraView cv : cameraViews) {
+            cv.startPlayback();
+        }
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+
+        disposeAllCameras();
+    }
+
+
+    private void addAllCameras() {
+        Settings settings = Settings.fromDisk(getContext());
+        List<Camera> cc = settings.getCameras();
+
+        int elemsPerSide = calcGridSideElements(cc.size());
+        int camIdx = 0;
+        for (int r = 0; r < elemsPerSide; r++) {
+            // Create row and add to row container
+            LinearLayout row = new LinearLayout(getContext());
+            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
+                    LinearLayout.LayoutParams.MATCH_PARENT,
+                    0,
+                    1.0f
+            );
+            binding.gridRowContainer.addView(row, params);
+            // Add camera viewers to the row
+            for (int c = 0; c < elemsPerSide; c++) {
+                if ( camIdx < cc.size() ) {
+                    Camera cam = cc.get(camIdx);
+                    CameraView cv = addCameraView(cam, row);
+                    cv.startPlayback();
+                } else {
+                    // Cameras are less than the maximum number of cells in grid: fill remaining cells with empty views
+                    View ev = new View(getContext());
+                    ev.setBackgroundColor(getResources().getColor(R.color.purple_700));
+                    LinearLayout.LayoutParams evParams = new LinearLayout.LayoutParams(
+                            0,
+                            LinearLayout.LayoutParams.MATCH_PARENT,
+                            1.0f
+                    );
+                    evParams.setMargins(viewMargin,viewMargin,viewMargin,viewMargin);
+                    row.addView(ev, evParams);
+                }
+                camIdx++;
+            }
+        }
+    }
+
+    private void disposeAllCameras() {
+        // Destroy players, libs etc
+        for (CameraView cv : cameraViews) {
+            cv.destroy();
+        }
+        cameraViews.clear();
+        // Remove views
+        binding.gridRowContainer.removeAllViews();
+    }
+
+    protected void hideAllCameraViewsButNot(View cameraView) {
+        for (int i = 0; i < binding.gridRowContainer.getChildCount(); i++) {
+            LinearLayout row = (LinearLayout) binding.gridRowContainer.getChildAt(i);
+            for (int j = 0; j < row.getChildCount(); j++) {
+                View cam = row.getChildAt(j);
+                if (cameraView.getId() == cam.getId())
+                    cam.setVisibility(View.VISIBLE);
+                else
+                    cam.setVisibility(View.GONE);
+            }
+        }
+    }
+
+    protected void showAllCameras() {
+        for (int i = 0; i < binding.gridRowContainer.getChildCount(); i++) {
+            LinearLayout row = (LinearLayout) binding.gridRowContainer.getChildAt(i);
+            for (int j = 0; j < row.getChildCount(); j++) {
+                View cam = row.getChildAt(j);
+                cam.setVisibility(View.VISIBLE);
+            }
+        }
+    }
+
+    private CameraView addCameraView(Camera camera, LinearLayout rowContainer) {
+        CameraView cv = new CameraView(
+                getContext(),
+                camera
+        );
+
+        // Add to layout
+        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
+                0,
+                LinearLayout.LayoutParams.MATCH_PARENT,
+                1.0f
+        );
+        params.setMargins(viewMargin,viewMargin,viewMargin,viewMargin);
+        rowContainer.addView(cv.surfaceView, params);
+
+        cameraViews.add(cv);
+        return cv;
+    }
+
+    /**
+     * Returns the number of elements per side needed to create a grid that can contain the provided elements number.
+     * Es: to display 3 elements is needed a 4-element grid, with 2 elements per side (a 2x2 grid)
+     * Es: to display 7 elements is needed a 9-element grid, with 3 elements per side (a 3x3 grid)
+     * @param elements
+     */
+    private int calcGridSideElements(int elements) {
+        return (int)(Math.ceil(Math.sqrt(elements)));
+    }
+
+    /**
+     * Contains all entities (views and java entities) related to a camera stream viewer
+     */
+    private class CameraView {
+        protected SurfaceView surfaceView;
+        protected MediaPlayer mediaPlayer;
+        protected IVLCVout ivlcVout;
+        protected Camera camera;
+        protected LibVLC libvlc;
+
+        public CameraView(Context context, Camera camera) {
+            this.camera = camera;
+            this.libvlc = new LibVLC(context, new ArrayList<>(Arrays.asList(VLC_OPTIONS)));
+
+            surfaceView = new SurfaceView(context);
+            surfaceView.setOnClickListener(new View.OnClickListener() {
+                @Override
+                public void onClick(View v) {
+                    SurveillanceFragment.this.hideAllCameraViewsButNot(v);
+                }
+            });
+            SurfaceHolder holder = surfaceView.getHolder();
+
+            holder.setKeepScreenOn(true);
+
+            // Create media player
+            mediaPlayer = new MediaPlayer(libvlc);
+
+            // Set up video output
+            ivlcVout = mediaPlayer.getVLCVout();
+            ivlcVout.setVideoView(surfaceView);
+            ivlcVout.attachViews();
+
+            // Load media and start playing
+            Media m = new Media(libvlc, Uri.parse(camera.getRtspUrl()));
+            mediaPlayer.setMedia(m);
+
+            // Register for view resize events
+            final ViewTreeObserver observer= surfaceView.getViewTreeObserver();
+            observer.addOnGlobalLayoutListener(() -> {
+                // Set rendering size
+                ivlcVout.setWindowSize(surfaceView.getWidth(), surfaceView.getHeight());
+            });
+        }
+
+        /**
+         * Starts the playback.
+         */
+        public void startPlayback() {
+            mediaPlayer.play();
+        }
+
+        /**
+         * Destroys the object and frees the memory
+         */
+        public void destroy() {
+            if (libvlc == null) {
+                Log.e(TAG, this.toString() + " already destroyed");
+                return;
+            }
+
+            mediaPlayer.stop();
+            final IVLCVout vout = mediaPlayer.getVLCVout();
+            vout.detachViews();
+            libvlc.release();
+            libvlc = null;
+            mediaPlayer.release();
+            mediaPlayer = null;
+        }
+    }
+}

app/src/main/java/it/danieleverducci/ojo/utils/DpiUtils.java

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+package it.danieleverducci.ojo.utils;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.util.TypedValue;
+
+public class DpiUtils {
+    public static int DpToPixels(Context context, int dp) {
+        Resources r = context.getResources();
+        return (int) TypedValue.applyDimension(
+                TypedValue.COMPLEX_UNIT_DIP,
+                dp,
+                r.getDisplayMetrics()
+        );
+    }
+}

app/src/main/res/drawable/ic_add_camera.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M3,4V1h2v3h3v2H5v3H3V6H0V4H3zM6,10V7h3V4h7l1.83,2H21c1.1,0 2,0.9 2,2v12c0,1.1 -0.9,2 -2,2H5c-1.1,0 -2,-0.9 -2,-2V10H6zM13,19c2.76,0 5,-2.24 5,-5s-2.24,-5 -5,-5s-5,2.24 -5,5S10.24,19 13,19zM9.8,14c0,1.77 1.43,3.2 3.2,3.2s3.2,-1.43 3.2,-3.2s-1.43,-3.2 -3.2,-3.2S9.8,12.23 9.8,14z"/>
+</vector>

app/src/main/res/drawable/ic_launcher_foreground.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108"
+    android:tint="#FFFFFF">
+  <group android:scaleX="2.61"
+      android:scaleY="2.61"
+      android:translateX="22.68"
+      android:translateY="22.68">
+    <path
+        android:fillColor="@android:color/white"
+        android:pathData="M12,4.5C7,4.5 2.73,7.61 1,12c1.73,4.39 6,7.5 11,7.5s9.27,-3.11 11,-7.5c-1.73,-4.39 -6,-7.5 -11,-7.5zM12,17c-2.76,0 -5,-2.24 -5,-5s2.24,-5 5,-5 5,2.24 5,5 -2.24,5 -5,5zM12,9c-1.66,0 -3,1.34 -3,3s1.34,3 3,3 3,-1.34 3,-3 -1.34,-3 -3,-3z"/>
+  </group>
+</vector>

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

@@ -0,0 +1,20 @@
+<?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=".ui.MainActivity">
+
+    <include layout="@layout/content_main" />
+
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
+        android:id="@+id/fab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|end"
+        android:layout_margin="@dimen/fab_margin"
+        app:srcCompat="@drawable/ic_add_camera"
+        app:tint="@color/purple_500"/>
+
+</androidx.coordinatorlayout.widget.CoordinatorLayout>

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

@@ -0,0 +1,19 @@
+<?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"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    app:layout_behavior="@string/appbar_scrolling_view_behavior">
+
+    <fragment
+        android:id="@+id/nav_host_fragment_content_main"
+        android:name="androidx.navigation.fragment.NavHostFragment"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:defaultNavHost="true"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:navGraph="@navigation/nav_graph" />
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/fragment_add_stream.xml

@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView 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.SurveillanceFragment">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:padding="50dp"
+        android:orientation="vertical"
+        android:gravity="center_horizontal">
+
+        <ImageView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginBottom="50dp"
+            android:src="@mipmap/ic_launcher_round"/>
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/add_stream"/>
+
+        <EditText
+            android:id="@+id/stream_url"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="10dp"
+            android:hint="@string/add_stream_placeholder_url"
+            android:lines="1"
+            android:maxLines="1"
+            android:inputType="textUri"/>
+
+        <Button
+            android:id="@+id/save"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="30dp"
+            android:text="@string/add_stream_save"/>
+
+        <View
+            android:layout_width="match_parent"
+            android:layout_height="1dp"
+            android:layout_margin="50dp"
+            android:background="@color/purple_200"/>
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="center_horizontal"
+            android:textAppearance="@style/TextAppearance.AppCompat.Title"
+            android:textColor="@color/purple_500"
+            android:text="@string/app_info_title"/>
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="20dp"
+            android:text="@string/app_info_creator_desc"
+            android:autoLink="web"/>
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="20dp"
+            android:text="@string/app_info_license_desc"
+            android:autoLink="web"/>
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="20dp"
+            android:text="@string/app_info_repo_desc"
+            android:autoLink="web"/>
+
+        <TextView
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="20dp"
+            android:text="@string/app_info_lib_desc"
+            android:autoLink="web"/>
+
+    </LinearLayout>
+
+</ScrollView>

app/src/main/res/layout/fragment_surveillance.xml

@@ -0,0 +1,12 @@
+<?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"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/grid_row_container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    tools:context=".ui.AddStreamFragment"
+    android:background="@color/purple_500">
+
+</LinearLayout>

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="@color/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>

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="@color/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>

app/src/main/res/navigation/nav_graph.xml

@@ -0,0 +1,28 @@
+<?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/nav_graph"
+    app:startDestination="@id/FirstFragment">
+
+    <fragment
+        android:id="@+id/FirstFragment"
+        android:name="it.danieleverducci.ojo.ui.SurveillanceFragment"
+        android:label="@string/first_fragment_label"
+        tools:layout="@layout/fragment_surveillance">
+
+        <action
+            android:id="@+id/action_FirstFragment_to_SecondFragment"
+            app:destination="@id/SecondFragment" />
+    </fragment>
+    <fragment
+        android:id="@+id/SecondFragment"
+        android:name="it.danieleverducci.ojo.ui.AddStreamFragment"
+        android:label="@string/second_fragment_label"
+        tools:layout="@layout/fragment_add_stream">
+
+        <action
+            android:id="@+id/action_SecondFragment_to_FirstFragment"
+            app:destination="@id/FirstFragment" />
+    </fragment>
+</navigation>

app/src/main/res/values-en/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- The english locale is defined in the default strings file -->
+</resources>

app/src/main/res/values-it/strings.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Ojo</string>
+    <!-- Strings used for fragments for navigation -->
+    <string name="first_fragment_label">First Fragment</string>
+    <string name="second_fragment_label">Second Fragment</string>
+
+    <string name="add_stream_placeholder_url">rtsp://username:password@192.168.1.123:554</string>
+    <string name="add_stream">Inserisci l\'url dello stream RTSP della tua IP Camera. Nota che questo differisce tra un modello e l\'altro. Consulta il pannello di configurazione o il manuale della tua IP Camera.</string>
+    <string name="add_stream_save">Salva</string>
+    <string name="add_stream_invalid_url">L\'URL RTSP non è valido</string>
+    <string name="add_stream_invalid_url_dismiss">Chiudi</string>
+    <string name="add_stream_error_saving">Si è verificato un errore durante il salvataggio della configurazione.</string>
+
+    <string name="app_info_title">Informazioni su Ojo</string>
+    <string name="app_info_creator_desc">Creato da Daniele Verducci.</string>
+    <string name="app_info_license_desc">Questa app è rilasciata sotto licenza GNU GENERAL PUBLIC LICENSE v3+. Puoi ottenerne una copia qui: https://raw.githubusercontent.com/penguin86/ojo/master/LICENSE</string>
+    <string name="app_info_repo_desc">Puoi trovare il codice sorgente al repository: https://github.com/penguin86/ojo</string>
+    <string name="app_info_lib_desc">Questa app è resa possibile dal magnifico lavoro dei team vlc and vlc-android! Per saperne di più o ottenere il codice sorgente: https://code.videolan.org/videolan/vlc-android</string>
+</resources>

app/src/main/res/values-night/themes.xml

@@ -0,0 +1,15 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.Ojo" parent="Theme.MaterialComponents.DayNight.NoActionBar">
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/purple_200</item>
+        <item name="colorPrimaryVariant">@color/purple_700</item>
+        <item name="colorOnPrimary">@color/black</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/purple_200</item>
+        <item name="colorSecondaryVariant">@color/purple_200</item>
+        <item name="colorOnSecondary">@color/black</item>
+    </style>
+</resources>

app/src/main/res/values-v27/themes.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <style name="Theme.Ojo" parent="Theme.MaterialComponents.DayNight.NoActionBar">
+        <item name="android:windowLayoutInDisplayCutoutMode">shortEdges</item>
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/purple_500</item>
+        <item name="colorPrimaryVariant">@color/purple_700</item>
+        <item name="colorOnPrimary">@color/white</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/purple_200</item>
+        <item name="colorSecondaryVariant">@color/purple_700</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>

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

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="purple_200">#FFBB86FC</color>
+    <color name="purple_500">#FF6200EE</color>
+    <color name="purple_700">#FF3700B3</color>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+</resources>

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

@@ -0,0 +1,3 @@
+<resources>
+    <dimen name="fab_margin">16dp</dimen>
+</resources>

app/src/main/res/values/ic_launcher_background.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#6200EE</color>
+</resources>

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

@@ -0,0 +1,19 @@
+<resources>
+    <string name="app_name">Ojo</string>
+    <!-- Strings used for fragments for navigation -->
+    <string name="first_fragment_label">First Fragment</string>
+    <string name="second_fragment_label">Second Fragment</string>
+
+    <string name="add_stream_placeholder_url">rtsp://username:password@192.168.1.123:554</string>
+    <string name="add_stream">Please insert your camera\'s RTSP stream. Note that the URL differs from camera to camera: you can find the complete URL in your camera\'s settings or user manual.</string>
+    <string name="add_stream_save">Save</string>
+    <string name="add_stream_invalid_url">Invalid RTSP url</string>
+    <string name="add_stream_invalid_url_dismiss">Dismiss</string>
+    <string name="add_stream_error_saving">An error has occurred while saving configuration</string>
+
+    <string name="app_info_title">About Ojo</string>
+    <string name="app_info_creator_desc">Created by Daniele Verducci.</string>
+    <string name="app_info_license_desc">This application is licensed under the GNU GENERAL PUBLIC LICENSE v3+. You can obtain a copy here: https://raw.githubusercontent.com/penguin86/ojo/master/LICENSE</string>
+    <string name="app_info_repo_desc">The source code can be obtained at the github repository: https://github.com/penguin86/ojo</string>
+    <string name="app_info_lib_desc">This app is made possible by the gourgeous vlc and vlc-android teams effort! You can know more or obtain the source code at https://code.videolan.org/videolan/vlc-android</string>
+</resources>

app/src/main/res/values/themes.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.Ojo" parent="Theme.MaterialComponents.DayNight.NoActionBar">
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/purple_500</item>
+        <item name="colorPrimaryVariant">@color/purple_700</item>
+        <item name="colorOnPrimary">@color/white</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/purple_500</item>
+        <item name="colorSecondaryVariant">@color/purple_700</item>
+        <item name="colorOnSecondary">@color/white</item>
+    </style>
+
+</resources>

app/src/test/java/it/danieleverducci/ojo/ExampleUnitTest.java

@@ -0,0 +1,17 @@
+package it.danieleverducci.ojo;
+
+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);
+    }
+}