init commit

.gitignore

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+./deb/*

README.md

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+# android-virtual-pen

android-virtual-pen/.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
+local.properties

android-virtual-pen/app/.gitignore

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+/build

android-virtual-pen/app/build.gradle.kts

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+plugins {
+    alias(libs.plugins.androidApplication)
+}
+
+android {
+    namespace = "com.pen_input"
+    compileSdk = 34
+
+    defaultConfig {
+        applicationId = "com.pen_input"
+        minSdk = 24
+        targetSdk = 34
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+    implementation(libs.appcompat)
+    implementation(libs.material)
+    implementation(libs.activity)
+    implementation(libs.constraintlayout)
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.ext.junit)
+    androidTestImplementation(libs.espresso.core)
+}

android-virtual-pen/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

android-virtual-pen/app/src/androidTest/java/com/pen_input/ExampleInstrumentedTest.java

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+package com.pen_input;
+
+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("com.pen_input", appContext.getPackageName());
+    }
+}

android-virtual-pen/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"
+    xmlns:tools="http://schemas.android.com/tools" >
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Peninput"
+        tools:targetApi="33" >
+        <activity
+            android:name=".MainActivity"
+            android:exported="true" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".UsbConnectedActivity"
+            android:exported="true" >
+            <intent-filter>
+                <action android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED" />
+            </intent-filter>
+            <meta-data android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED"
+                android:resource="@xml/accessory_filter" />
+        </activity>
+    </application>
+
+</manifest>

android-virtual-pen/app/src/main/java/com/pen_input/MainActivity.java

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+package com.pen_input;
+
+import static android.content.ContentValues.TAG;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.hardware.usb.UsbAccessory;
+import android.hardware.usb.UsbManager;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+
+import androidx.activity.EdgeToEdge;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsCompat;
+
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+
+public class MainActivity extends AppCompatActivity {
+
+    private UsbManager usbManager;
+    private View mainView;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        EdgeToEdge.enable(this);
+        setContentView(R.layout.activity_main);
+        mainView = findViewById(R.id.main);
+        ViewCompat.setOnApplyWindowInsetsListener(mainView, (v, insets) -> {
+            Insets systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars());
+            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
+            return insets;
+        });
+        usbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
+        CompletableFuture<Optional<UsbAccessory>> usbAccessoryCompletableFuture = CompletableFuture.supplyAsync(this::acquireUsbAccessory);
+        usbAccessoryCompletableFuture.thenAcceptAsync(maybeUsbAccessory -> maybeUsbAccessory.ifPresent(usbAccessory -> UsbStreamService.streamTouchInputToUsb(usbManager, usbAccessory, mainView)));
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        UsbStreamService.closeStream();
+    }
+
+    private Optional<UsbAccessory> acquireUsbAccessory() {
+        boolean isDisplayingUsbConnectionAlert = false;
+        while (true) {
+            UsbAccessory[] accessories = usbManager.getAccessoryList();
+            if (accessories == null || accessories.length == 0) {
+                if(!isDisplayingUsbConnectionAlert){
+                    openAlertDialog("Usb link not established. Make sure your device is connected to the PC and launch the usb-host application.");
+                    isDisplayingUsbConnectionAlert = true;
+                }
+                Log.d(TAG, "Empty accessories list, you should initialize the connected PC as accessory");
+            } else {
+                UsbAccessory accessory = accessories[0];
+                if(usbManager.hasPermission(accessory)){
+                    return Optional.of(accessory);
+                }
+            }
+            try {
+                //noinspection BusyWait
+                Thread.sleep(1000);
+            } catch (InterruptedException e) {
+                return Optional.empty();
+            }
+        }
+    }
+
+    private void openAlertDialog(String message){
+        runOnUiThread(() -> {
+            new AlertDialog.Builder(mainView.getContext()).setTitle("Warning")
+                    .setMessage(message)
+                    .show();
+        });
+    }
+}