Parakeet app skeleton (meta-pytorch#209)

Fork the Whisper demo app to create a Parakeet TDT speech recognition
demo, replacing the AsrModule streaming API with the ParakeetModule
synchronous API that returns a complete transcription string directly.

Key changes from the Whisper app:
- Use ParakeetModule instead of AsrModule/AsrCallback
- Remove preprocessor file support (not applicable to Parakeet)
- Replace 6 Whisper model presets with single Parakeet TDT 0.6B INT4
- Simplify transcription logic (no token streaming or start/end stripping)

Author: kirklandsign

parakeet/android/ParakeetApp/.gitignore

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+*.iml
+.gradle
+/local.properties
+.idea/
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

parakeet/android/ParakeetApp/README.md

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+# Parakeet Demo App
+
+This app demonstrates running the Parakeet TDT speech recognition model on Android using ExecuTorch.
+
+## Download ExecuTorch AAR
+
+Download the prebuilt ExecuTorch AAR (with Parakeet JNI bindings) and place it in `app/libs/`:
+
+```bash
+mkdir -p app/libs
+curl -L -o app/libs/executorch.aar https://gha-artifacts.s3.amazonaws.com/pytorch/executorch/21934561658/artifacts/executorch.aar
+```
+
+## Export Model Files
+
+Export the model `.pte` and tokenizer files following the instructions at:
+https://github.com/pytorch/executorch/tree/main/examples/models/parakeet
+
+This app requires a model `.pte` and a tokenizer `.model` file.
+
+## Run the App
+
+1. Download the ExecuTorch AAR (see above)
+2. Open ParakeetApp in Android Studio
+3. Build and run on device
+
+## Download Models
+
+The app includes a built-in download screen to fetch the Parakeet TDT 0.6B (INT4) model from HuggingFace:
+- Model: `parakeet_int4.pte`
+- Tokenizer: `tokenizer.model`
+
+Alternatively, push files manually:
+```bash
+adb push model.pte /data/local/tmp/parakeet/
+adb push tokenizer.model /data/local/tmp/parakeet/
+```

parakeet/android/ParakeetApp/app/.gitignore

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+/build

parakeet/android/ParakeetApp/app/build.gradle.kts

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+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
+    alias(libs.plugins.kotlin.compose)
+}
+
+val useLocalAar: Boolean? = (project.findProperty("useLocalAar") as? String)?.toBoolean()
+
+android {
+    namespace = "com.example.parakeetapp"
+    compileSdk = 35
+
+    defaultConfig {
+        applicationId = "com.example.parakeetapp"
+        minSdk = 24
+        targetSdk = 35
+        versionCode = 1
+        versionName = "1.0"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
+    }
+    kotlinOptions {
+        jvmTarget = "11"
+    }
+    buildFeatures {
+        compose = true
+    }
+}
+
+dependencies {
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.lifecycle.runtime.ktx)
+    implementation(libs.androidx.activity.compose)
+    implementation(platform(libs.androidx.compose.bom))
+    implementation(libs.androidx.ui)
+    implementation(libs.androidx.ui.graphics)
+    implementation(libs.androidx.ui.tooling.preview)
+    implementation(libs.androidx.material3)
+    debugImplementation(libs.androidx.ui.tooling)
+    if (useLocalAar == true) {
+        implementation(files("libs/executorch.aar"))
+    } else {
+        implementation("org.pytorch:executorch-android:1.1.0")
+    }
+    implementation("com.facebook.fbjni:fbjni:0.5.1")
+}

parakeet/android/ParakeetApp/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

parakeet/android/ParakeetApp/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">
+
+    <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="@android:style/Theme.Material.Light.NoActionBar"
+        android:extractNativeLibs="true">
+
+        <uses-native-library
+            android:name="libcdsprpc.so"
+            android:required="false" />
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:label="@string/app_name"
+            android:theme="@android:style/Theme.Material.Light.NoActionBar">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.INTERNET" />
+
+</manifest>