Add Android APK for Silero VAD (#335)

android/SherpaOnnxVad/app/src/main/AndroidManifest.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
+
+    <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.SherpaOnnxVad"
+        tools:targetApi="31">
+        <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>
+
+            <meta-data
+                android:name="android.app.lib_name"
+                android:value="" />
+        </activity>
+    </application>
+
+</manifest>

android/SherpaOnnxVad/app/src/main/assets/.gitignore

@@ -0,0 +1 @@
+*.onnx

android/SherpaOnnxVad/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt

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+package com.k2fsa.sherpa.onnx
+
+import android.Manifest
+import android.content.pm.PackageManager
+import android.media.AudioFormat
+import android.media.AudioRecord
+import android.media.MediaRecorder
+import android.os.Bundle
+import android.util.Log
+import android.view.View
+import android.widget.Button
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.app.ActivityCompat
+import kotlin.concurrent.thread
+
+
+private const val TAG = "sherpa-onnx"
+private const val REQUEST_RECORD_AUDIO_PERMISSION = 200
+
+class MainActivity : AppCompatActivity() {
+
+    private lateinit var recordButton: Button
+    private lateinit var circle: View
+
+    private lateinit var vad: Vad
+
+    private var audioRecord: AudioRecord? = null
+    private var recordingThread: Thread? = null
+    private val audioSource = MediaRecorder.AudioSource.MIC
+    private val sampleRateInHz = 16000
+    private val channelConfig = AudioFormat.CHANNEL_IN_MONO
+
+    // Note: We don't use AudioFormat.ENCODING_PCM_FLOAT
+    // since the AudioRecord.read(float[]) needs API level >= 23
+    // but we are targeting API level >= 21
+    private val audioFormat = AudioFormat.ENCODING_PCM_16BIT
+
+    private val permissions: Array<String> = arrayOf(Manifest.permission.RECORD_AUDIO)
+
+    @Volatile
+    private var isRecording: Boolean = false
+
+    override fun onRequestPermissionsResult(
+        requestCode: Int, permissions: Array<String>, grantResults: IntArray
+    ) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
+        val permissionToRecordAccepted = if (requestCode == REQUEST_RECORD_AUDIO_PERMISSION) {
+            grantResults[0] == PackageManager.PERMISSION_GRANTED
+        } else {
+            false
+        }
+
+        if (!permissionToRecordAccepted) {
+            Log.e(TAG, "Audio record is disallowed")
+            finish()
+        }
+
+        Log.i(TAG, "Audio record is permitted")
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        ActivityCompat.requestPermissions(this, permissions, REQUEST_RECORD_AUDIO_PERMISSION)
+
+        Log.i(TAG, "Start to initialize model")
+        initVadModel()
+        Log.i(TAG, "Finished initializing model")
+
+        circle= findViewById(R.id.powerCircle)
+
+        recordButton = findViewById(R.id.record_button)
+        recordButton.setOnClickListener { onclick() }
+    }
+
+    private fun onclick() {
+        if (!isRecording) {
+            val ret = initMicrophone()
+            if (!ret) {
+                Log.e(TAG, "Failed to initialize microphone")
+                return
+            }
+            Log.i(TAG, "state: ${audioRecord?.state}")
+            audioRecord!!.startRecording()
+            recordButton.setText(R.string.stop)
+            isRecording = true
+
+            vad.reset()
+            recordingThread = thread(true) {
+                processSamples()
+            }
+            Log.i(TAG, "Started recording")
+            onVad(false)
+
+        } else {
+            isRecording = false
+
+            audioRecord!!.stop()
+            audioRecord!!.release()
+            audioRecord = null
+
+            recordButton.setText(R.string.start)
+            onVad(false)
+            Log.i(TAG, "Stopped recording")
+        }
+    }
+
+    private fun onVad(isSpeech: Boolean) {
+        if(isSpeech) {
+            circle.background = resources.getDrawable(R.drawable.red_circle)
+        } else {
+            circle.background = resources.getDrawable(R.drawable.black_circle)
+        }
+    }
+
+    private  fun initVadModel() {
+        val type = 0
+        println("Select VAD model type ${type}")
+        val config = getVadModelConfig(type)
+
+        vad = Vad(
+            assetManager = application.assets,
+            config = config!!,
+        )
+    }
+
+    private fun initMicrophone(): Boolean {
+        if (ActivityCompat.checkSelfPermission(
+                this, Manifest.permission.RECORD_AUDIO
+            ) != PackageManager.PERMISSION_GRANTED
+        ) {
+            ActivityCompat.requestPermissions(this, permissions, REQUEST_RECORD_AUDIO_PERMISSION)
+            return false
+        }
+
+        val numBytes = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat)
+        Log.i(
+            TAG, "buffer size in milliseconds: ${numBytes * 1000.0f / sampleRateInHz}"
+        )
+
+        audioRecord = AudioRecord(
+            audioSource,
+            sampleRateInHz,
+            channelConfig,
+            audioFormat,
+            numBytes * 2 // a sample has two bytes as we are using 16-bit PCM
+        )
+        return true
+    }
+
+    private fun processSamples() {
+        Log.i(TAG, "processing samples")
+
+        val bufferSize = 512 // in samples
+        val buffer = ShortArray(bufferSize)
+
+        while (isRecording) {
+            val ret = audioRecord?.read(buffer, 0, buffer.size)
+            if (ret != null && ret > 0) {
+                val samples = FloatArray(ret) { buffer[it] / 32768.0f }
+
+                vad.acceptWaveform(samples)
+                while(!vad.empty()) {vad.pop();}
+
+                val isSpeechDetected = vad.isSpeechDetected()
+
+                runOnUiThread {
+                    onVad(isSpeechDetected)
+                }
+            }
+        }
+    }
+}

android/SherpaOnnxVad/app/src/main/java/com/k2fsa/sherpa/onnx/Vad.kt

@@ -0,0 +1,101 @@
+// Copyright (c)  2023  Xiaomi Corporation
+package com.k2fsa.sherpa.onnx
+
+import android.content.res.AssetManager
+
+data class SileroVadModelConfig(
+    var model: String,
+    var threshold: Float = 0.5F,
+    var minSilenceDuration: Float = 0.25F,
+    var minSpeechDuration: Float = 0.25F,
+    var windowSize: Int = 512,
+)
+
+data class VadModelConfig(
+    var sileroVadModelConfig: SileroVadModelConfig,
+    var sampleRate: Int = 16000,
+    var numThreads: Int = 1,
+    var provider: String = "cpu",
+    var debug: Boolean = false,
+)
+
+class Vad(
+    assetManager: AssetManager? = null,
+    var config: VadModelConfig,
+) {
+    private val ptr: Long
+
+    init {
+        if (assetManager != null) {
+            ptr = new(assetManager, config)
+        } else {
+            ptr = newFromFile(config)
+        }
+    }
+
+    protected fun finalize() {
+        delete(ptr)
+    }
+
+    fun acceptWaveform(samples: FloatArray) = acceptWaveform(ptr, samples)
+
+    fun empty(): Boolean = empty(ptr)
+    fun pop() = pop(ptr)
+
+    // return an array containing
+    // [start: Int, samples: FloatArray]
+    fun front() = front(ptr)
+
+    fun isSpeechDetected(): Boolean = isSpeechDetected(ptr)
+
+    fun reset() = reset(ptr)
+
+    private external fun delete(ptr: Long)
+
+    private external fun new(
+        assetManager: AssetManager,
+        config: VadModelConfig,
+    ): Long
+
+    private external fun newFromFile(
+        config: VadModelConfig,
+    ): Long
+
+    private external fun acceptWaveform(ptr: Long, samples: FloatArray)
+    private external fun empty(ptr: Long): Boolean
+    private external fun pop(ptr: Long)
+    private external fun front(ptr: Long): Array<Any>
+    private external fun isSpeechDetected(ptr: Long): Boolean
+    private external fun reset(ptr: Long)
+
+    companion object {
+        init {
+            System.loadLibrary("sherpa-onnx-jni")
+        }
+    }
+}
+
+// Please visit
+// https://github.com/snakers4/silero-vad/blob/master/files/silero_vad.onnx
+// to download silero_vad.onnx
+// and put it inside the assets/
+// directory
+fun getVadModelConfig(type: Int): VadModelConfig? {
+    when (type) {
+        0 -> {
+            return VadModelConfig(
+                sileroVadModelConfig = SileroVadModelConfig(
+                    model = "silero_vad.onnx",
+                    threshold = 0.5F,
+                    minSilenceDuration = 0.25F,
+                    minSpeechDuration = 0.25F,
+                    windowSize = 512,
+                ),
+                sampleRate = 16000,
+                numThreads = 1,
+                provider = "cpu",
+            )
+        }
+    }
+    return null;
+}

android/SherpaOnnxVad/app/src/main/jniLibs/.gitignore

@@ -0,0 +1 @@
+*.so

android/SherpaOnnxVad/app/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<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:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                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:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        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:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

android/SherpaOnnxVad/app/src/main/res/drawable/black_circle.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+  <item>
+    <shape  android:shape="oval">
+
+    <solid  android:color="#FF000000"/>
+
+    <size
+        android:width="300dp"
+        android:height="300dp"/>
+    </shape>
+  </item>
+</selector>

android/SherpaOnnxVad/app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

android/SherpaOnnxVad/app/src/main/res/drawable/red_circle.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+  <item>
+    <shape  android:shape="oval">
+
+    <solid  android:color="#FFFF0000"/>
+
+    <size
+        android:width="300dp"
+        android:height="300dp"/>
+    </shape>
+  </item>
+</selector>

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

@@ -0,0 +1,43 @@
+<?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=".MainActivity">
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:gravity="bottom"
+        android:orientation="vertical"
+        >
+
+        <Space
+            android:layout_width="match_parent"
+            android:layout_height="10dp" />
+
+        <LinearLayout
+            android:id="@+id/powerCircle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_horizontal"
+            android:background="@drawable/black_circle"
+            android:orientation="vertical" />
+
+        <Space
+            android:layout_width="match_parent"
+            android:layout_height="200dp" />
+
+        <Button
+            android:id="@+id/record_button"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="@string/start" />
+
+
+
+    </LinearLayout>
+
+
+
+</androidx.constraintlayout.widget.ConstraintLayout>

android/SherpaOnnxVad/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>

android/SherpaOnnxVad/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>

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

@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.SherpaOnnxVad" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- 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/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_200</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>

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

@@ -0,0 +1,10 @@
+<?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="teal_200">#FF03DAC5</color>
+    <color name="teal_700">#FF018786</color>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+</resources>

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

@@ -0,0 +1,7 @@
+<resources>
+    <string name="app_name">Next-gen Kaldi: SileroVAD</string>
+
+    <string name="hint">Click the Start button to play Silero VAD with Next-gen Kaldi.</string>
+    <string name="start">Start</string>
+    <string name="stop">Stop</string>
+</resources>

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

@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.SherpaOnnxVad" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- 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/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_700</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>

android/SherpaOnnxVad/app/src/main/res/xml/backup_rules.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample backup rules file; uncomment and customize as necessary.
+   See https://developer.android.com/guide/topics/data/autobackup
+   for details.
+   Note: This file is ignored for devices older that API 31
+   See https://developer.android.com/about/versions/12/backup-restore
+-->
+<full-backup-content>
+    <!--
+   <include domain="sharedpref" path="."/>
+   <exclude domain="sharedpref" path="device.xml"/>
+-->
+</full-backup-content>

android/SherpaOnnxVad/app/src/main/res/xml/data_extraction_rules.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample data extraction rules file; uncomment and customize as necessary.
+   See https://developer.android.com/about/versions/12/backup-restore#xml-changes
+   for details.
+-->
+<data-extraction-rules>
+    <cloud-backup>
+        <!-- TODO: Use <include> and <exclude> to control what is backed up.
+        <include .../>
+        <exclude .../>
+        -->
+    </cloud-backup>
+    <!--
+    <device-transfer>
+        <include .../>
+        <exclude .../>
+    </device-transfer>
+    -->
+</data-extraction-rules>