Support Android (#59)

2023-02-24 13:57:03 +08:00
parent 5a5d029490
commit 9064b3f016
68 changed files with 1469 additions and 220 deletions
--- a/android/SherpaOnnx/app/src/main/AndroidManifest.xml
+++ b/android/SherpaOnnx/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.SherpaOnnx"
+        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>
--- a/android/SherpaOnnx/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
+++ b/android/SherpaOnnx/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
@@ -0,0 +1,204 @@
+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.text.method.ScrollingMovementMethod
+import android.util.Log
+import android.widget.Button
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.app.ActivityCompat
+import com.k2fsa.sherpa.onnx.*
+import kotlin.concurrent.thread
+
+private const val TAG = "sherpa-onnx"
+private const val REQUEST_RECORD_AUDIO_PERMISSION = 200
+
+class MainActivity : AppCompatActivity() {
+    private val permissions: Array<String> = arrayOf(Manifest.permission.RECORD_AUDIO)
+
+    // If there is a GPU and useGPU is true, we will use GPU
+    // If there is no GPU and useGPU is true, we won't use GPU
+    private val useGPU: Boolean = true
+
+    private lateinit var model: SherpaOnnx
+    private var audioRecord: AudioRecord? = null
+    private lateinit var recordButton: Button
+    private lateinit var textView: TextView
+    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 var idx: Int = 0
+    private var lastText: String = ""
+
+    @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")
+        initModel()
+        Log.i(TAG, "Finished initializing model")
+
+        recordButton = findViewById(R.id.record_button)
+        recordButton.setOnClickListener { onclick() }
+
+        textView = findViewById(R.id.my_text)
+        textView.movementMethod = ScrollingMovementMethod()
+    }
+
+    private fun onclick() {
+        if (!isRecording) {
+            val ret = initMicrophone()
+            if (!ret) {
+                Log.e(TAG, "Failed to initialize microphone")
+                return
+            }
+            Log.i(TAG, "state: ${audioRecord?.state}")
+            audioRecord!!.startRecording()
+            recordButton.setText(R.string.stop)
+            isRecording = true
+            model.reset()
+            textView.text = ""
+            lastText = ""
+            idx = 0
+
+            recordingThread = thread(true) {
+                processSamples()
+            }
+            Log.i(TAG, "Started recording")
+        } else {
+            isRecording = false
+            audioRecord!!.stop()
+            audioRecord!!.release()
+            audioRecord = null
+            recordButton.setText(R.string.start)
+            Log.i(TAG, "Stopped recording")
+        }
+    }
+
+    private fun processSamples() {
+        Log.i(TAG, "processing samples")
+
+        val interval = 0.1 // i.e., 100 ms
+        val bufferSize = (interval * sampleRateInHz).toInt() // in samples
+        val buffer = ShortArray(bufferSize)
+
+        while (isRecording) {
+            val ret = audioRecord?.read(buffer, 0, buffer.size)
+            if (ret != null && ret > 0) {
+                val samples = FloatArray(ret) { buffer[it] / 32768.0f }
+                model.decodeSamples(samples)
+                runOnUiThread {
+                    val isEndpoint = model.isEndpoint()
+                    val text = model.text
+
+                    if(text.isNotBlank()) {
+                        if (lastText.isBlank()) {
+                            textView.text = "${idx}: ${text}"
+                        } else {
+                            textView.text = "${lastText}\n${idx}: ${text}"
+                        }
+                    }
+
+                    if (isEndpoint) {
+                        model.reset()
+                        if (text.isNotBlank()) {
+                            lastText = "${lastText}\n${idx}: ${text}"
+                            idx += 1
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    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 initModel() {
+        val config = OnlineRecognizerConfig(
+            featConfig = getFeatureConfig(sampleRate = 16000.0f, featureDim = 80),
+            modelConfig = getModelConfig(type = 1)!!,
+            endpointConfig = getEndpointConfig(),
+            enableEndpoint = true
+        )
+
+        model = SherpaOnnx(
+            assetManager = application.assets,
+            config = config,
+        )
+       /*
+        println("reading samples")
+        val samples = WaveReader.readWave(
+            assetManager = application.assets,
+            // filename = "sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/test_wavs/0.wav",
+            filename = "sherpa-onnx-lstm-zh-2023-02-20/test_wavs/0.wav",
+            // filename="sherpa-onnx-lstm-en-2023-02-17/test_wavs/1089-134686-0001.wav"
+        )
+        println("samples read done!")
+
+        model.decodeSamples(samples!!)
+
+        val tailPaddings = FloatArray(8000) // 0.5 seconds
+        model.decodeSamples(tailPaddings)
+
+        println("result is: ${model.text}")
+        model.reset()
+        */
+    }
+}
--- a/android/SherpaOnnx/app/src/main/java/com/k2fsa/sherpa/onnx/SherpaOnnx.kt
+++ b/android/SherpaOnnx/app/src/main/java/com/k2fsa/sherpa/onnx/SherpaOnnx.kt
@@ -0,0 +1,146 @@
+package com.k2fsa.sherpa.onnx
+
+import android.content.res.AssetManager
+
+data class EndpointRule(
+    var mustContainNonSilence: Boolean,
+    var minTrailingSilence: Float,
+    var minUtteranceLength: Float,
+)
+
+data class EndpointConfig(
+    var rule1: EndpointRule = EndpointRule(false, 2.4f, 0.0f),
+    var rule2: EndpointRule = EndpointRule(true, 1.4f, 0.0f),
+    var rule3: EndpointRule = EndpointRule(false, 0.0f, 20.0f)
+)
+
+data class OnlineTransducerModelConfig(
+    var encoder: String,
+    var decoder: String,
+    var joiner: String,
+    var tokens: String,
+    var numThreads: Int = 2,
+    var debug: Boolean = false,
+)
+
+data class FeatureConfig(
+    var sampleRate: Float = 16000.0f,
+    var featureDim: Int = 80,
+)
+
+data class OnlineRecognizerConfig(
+    var featConfig: FeatureConfig = FeatureConfig(),
+    var modelConfig: OnlineTransducerModelConfig,
+    var endpointConfig: EndpointConfig = EndpointConfig(),
+    var enableEndpoint: Boolean,
+)
+
+class SherpaOnnx(
+    assetManager: AssetManager, var config: OnlineRecognizerConfig
+) {
+    private val ptr: Long
+
+    init {
+        ptr = new(assetManager, config)
+    }
+
+    protected fun finalize() {
+        delete(ptr)
+    }
+
+
+    fun decodeSamples(samples: FloatArray) =
+        decodeSamples(ptr, samples, sampleRate = config.featConfig.sampleRate)
+
+    fun inputFinished() = inputFinished(ptr)
+    fun reset() = reset(ptr)
+    fun isEndpoint(): Boolean = isEndpoint(ptr)
+
+    val text: String
+        get() = getText(ptr)
+
+    private external fun delete(ptr: Long)
+
+    private external fun new(
+        assetManager: AssetManager,
+        config: OnlineRecognizerConfig,
+    ): Long
+
+    private external fun decodeSamples(ptr: Long, samples: FloatArray, sampleRate: Float)
+    private external fun inputFinished(ptr: Long)
+    private external fun getText(ptr: Long): String
+    private external fun reset(ptr: Long)
+    private external fun isEndpoint(ptr: Long): Boolean
+
+    companion object {
+        init {
+            System.loadLibrary("sherpa-onnx-jni")
+        }
+    }
+}
+
+fun getFeatureConfig(sampleRate: Float, featureDim: Int): FeatureConfig {
+    return FeatureConfig(sampleRate=sampleRate, featureDim=featureDim)
+}
+
+/*
+Please see
+https://k2-fsa.github.io/sherpa/onnx/pretrained_models/index.html
+for a list of pre-trained models.
+
+We only add a few here. Please change the following code
+to add your own. (It should be straightforward to add a new model
+by following the code)
+
+@param type
+0 - sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20 (Bilingual, Chinese + English)
+    https://k2-fsa.github.io/sherpa/onnx/pretrained_models/zipformer-transducer-models.html#sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20-bilingual-chinese-english
+
+1 - csukuangfj/sherpa-onnx-lstm-zh-2023-02-20 (Chinese)
+
+    https://k2-fsa.github.io/sherpa/onnx/pretrained_models/lstm-transducer-models.html#csukuangfj-sherpa-onnx-lstm-zh-2023-02-20-chinese
+
+2 - csukuangfj/sherpa-onnx-lstm-en-2023-02-17 (English)
+    https://k2-fsa.github.io/sherpa/onnx/pretrained_models/lstm-transducer-models.html#csukuangfj-sherpa-onnx-lstm-en-2023-02-17-english
+ */
+fun getModelConfig(type: Int): OnlineTransducerModelConfig? {
+    when (type) {
+        0 -> {
+            val modelDir = "sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20"
+            return OnlineTransducerModelConfig(
+                encoder = "$modelDir/encoder-epoch-99-avg-1.onnx",
+                decoder = "$modelDir/decoder-epoch-99-avg-1.onnx",
+                joiner = "$modelDir/joiner-epoch-99-avg-1.onnx",
+                tokens = "$modelDir/tokens.txt",
+            )
+        }
+        1 -> {
+            val modelDir = "sherpa-onnx-lstm-zh-2023-02-20"
+            return OnlineTransducerModelConfig(
+                encoder = "$modelDir/encoder-epoch-11-avg-1.onnx",
+                decoder = "$modelDir/decoder-epoch-11-avg-1.onnx",
+                joiner = "$modelDir/joiner-epoch-11-avg-1.onnx",
+                tokens = "$modelDir/tokens.txt",
+            )
+        }
+
+        2 -> {
+            val modelDir = "sherpa-onnx-lstm-en-2023-02-17"
+            return OnlineTransducerModelConfig(
+                encoder = "$modelDir/encoder-epoch-99-avg-1.onnx",
+                decoder = "$modelDir/decoder-epoch-99-avg-1.onnx",
+                joiner = "$modelDir/joiner-epoch-99-avg-1.onnx",
+                tokens = "$modelDir/tokens.txt",
+            )
+        }
+    }
+    return null;
+}
+
+fun getEndpointConfig(): EndpointConfig {
+    return EndpointConfig(
+        rule1 = EndpointRule(false, 2.4f, 0.0f),
+        rule2 = EndpointRule(true, 1.4f, 0.0f),
+        rule3 = EndpointRule(false, 0.0f, 20.0f)
+    )
+}
--- a/android/SherpaOnnx/app/src/main/java/com/k2fsa/sherpa/onnx/WaveReader.kt
+++ b/android/SherpaOnnx/app/src/main/java/com/k2fsa/sherpa/onnx/WaveReader.kt
@@ -0,0 +1,17 @@
+package com.k2fsa.sherpa.onnx
+
+import android.content.res.AssetManager
+
+class WaveReader {
+    companion object {
+        // Read a mono wave file.
+        // No resampling is made.
+        external fun readWave(
+            assetManager: AssetManager, filename: String, expected_sample_rate: Float = 16000.0f
+        ): FloatArray?
+
+        init {
+            System.loadLibrary("sherpa-onnx-jni")
+        }
+    }
+}
--- a/android/SherpaOnnx/app/src/main/jniLibs/.gitignore
+++ b/android/SherpaOnnx/app/src/main/jniLibs/.gitignore
@@ -0,0 +1,4 @@
+*.so
+*.txt
+*.onnx
+*.wav
--- a/android/SherpaOnnx/app/src/main/jniLibs/arm64-v8a/.gitkeep
+++ b/android/SherpaOnnx/app/src/main/jniLibs/arm64-v8a/.gitkeep
--- a/android/SherpaOnnx/app/src/main/jniLibs/armeabi-v7a/.gitkeep
+++ b/android/SherpaOnnx/app/src/main/jniLibs/armeabi-v7a/.gitkeep
--- a/android/SherpaOnnx/app/src/main/jniLibs/x86_64/.gitkeep
+++ b/android/SherpaOnnx/app/src/main/jniLibs/x86_64/.gitkeep
--- a/android/SherpaOnnx/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/android/SherpaOnnx/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>
--- a/android/SherpaOnnx/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/android/SherpaOnnx/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>
--- a/android/SherpaOnnx/app/src/main/res/layout/activity_main.xml
+++ b/android/SherpaOnnx/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,38 @@
+<?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="center"
+        android:orientation="vertical">
+
+        <TextView
+            android:id="@+id/my_text"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:layout_weight="2.5"
+            android:padding="24dp"
+            android:scrollbars="vertical"
+            android:singleLine="false"
+            android:text="@string/hint"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent" />
+
+        <Button
+            android:id="@+id/record_button"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_weight="0.5"
+            android:text="@string/start" />
+    </LinearLayout>
+
+
+</androidx.constraintlayout.widget.ConstraintLayout>
--- a/android/SherpaOnnx/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/android/SherpaOnnx/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>
--- a/android/SherpaOnnx/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/android/SherpaOnnx/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>
--- a/android/SherpaOnnx/app/src/main/res/mipmap-hdpi/ic_launcher.webp
+++ b/android/SherpaOnnx/app/src/main/res/mipmap-hdpi/ic_launcher.webp
--- a/android/SherpaOnnx/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp
+++ b/android/SherpaOnnx/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp
--- a/android/SherpaOnnx/app/src/main/res/mipmap-mdpi/ic_launcher.webp
+++ b/android/SherpaOnnx/app/src/main/res/mipmap-mdpi/ic_launcher.webp
--- a/android/SherpaOnnx/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp
+++ b/android/SherpaOnnx/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp
--- a/android/SherpaOnnx/app/src/main/res/mipmap-xhdpi/ic_launcher.webp
+++ b/android/SherpaOnnx/app/src/main/res/mipmap-xhdpi/ic_launcher.webp
--- a/android/SherpaOnnx/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp
+++ b/android/SherpaOnnx/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp
--- a/android/SherpaOnnx/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp
+++ b/android/SherpaOnnx/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp
--- a/android/SherpaOnnx/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp
+++ b/android/SherpaOnnx/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp
--- a/android/SherpaOnnx/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp
+++ b/android/SherpaOnnx/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp
--- a/android/SherpaOnnx/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp
+++ b/android/SherpaOnnx/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp
--- a/android/SherpaOnnx/app/src/main/res/values-night/themes.xml
+++ b/android/SherpaOnnx/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.SherpaOnnx" 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>
--- a/android/SherpaOnnx/app/src/main/res/values/colors.xml
+++ b/android/SherpaOnnx/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>
--- a/android/SherpaOnnx/app/src/main/res/values/strings.xml
+++ b/android/SherpaOnnx/app/src/main/res/values/strings.xml
@@ -0,0 +1,11 @@
+<resources>
+    <string name="app_name">ASR with Next-gen Kaldi</string>
+    <string name="hint">Click the Start button to play speech-to-text with Next-gen Kaldi.
+        \n
+        \n\n\n
+        The source code and pre-trained models are publicly available.
+        Please see https://github.com/k2-fsa/sherpa-onnx for details.
+    </string>
+    <string name="start">Start</string>
+    <string name="stop">Stop</string>
+</resources>
--- a/android/SherpaOnnx/app/src/main/res/values/themes.xml
+++ b/android/SherpaOnnx/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.SherpaOnnx" 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>
--- a/android/SherpaOnnx/app/src/main/res/xml/backup_rules.xml
+++ b/android/SherpaOnnx/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>
--- a/android/SherpaOnnx/app/src/main/res/xml/data_extraction_rules.xml
+++ b/android/SherpaOnnx/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>