Add build script for Android armv8a (#58)

+#!/usr/bin/env bash
+set -ex
+
+dir=build-android-arm64-v8a
+
+mkdir -p $dir
+cd $dir
+
+# Note from https://github.com/Tencent/ncnn/wiki/how-to-build#build-for-android
+# (optional) remove the hardcoded debug flag in Android NDK android-ndk
+# issue: https://github.com/android/ndk/issues/243
+#
+# open $ANDROID_NDK/build/cmake/android.toolchain.cmake for ndk < r23
+# or $ANDROID_NDK/build/cmake/android-legacy.toolchain.cmake for ndk >= r23
+#
+# delete "-g" line
+#
+# list(APPEND ANDROID_COMPILER_FLAGS
+#   -g
+#   -DANDROID
+
+
+if [ -z $ANDROID_NDK ]; then
+  ANDROID_NDK=/ceph-fj/fangjun/software/android-sdk/ndk/21.0.6113669
+  # or use
+  # ANDROID_NDK=/ceph-fj/fangjun/software/android-ndk
+  #
+  # Inside the $ANDROID_NDK directory, you can find a binary ndk-build
+  # and some other files like the file "build/cmake/android.toolchain.cmake"
+
+  if [ ! -d $ANDROID_NDK ]; then
+    # For macOS, I have installed Android Studio, select the menu
+    # Tools -> SDK manager -> Android SDK
+    # and set "Android SDK location" to /Users/fangjun/software/my-android
+    ANDROID_NDK=/Users/fangjun/software/my-android/ndk/22.1.7171670
+  fi
+fi
+
+if [ ! -d $ANDROID_NDK ]; then
+  echo Please set the environment variable ANDROID_NDK before you run this script
+  exit 1
+fi
+
+echo "ANDROID_NDK: $ANDROID_NDK"
+sleep 1
+
+cmake -DCMAKE_TOOLCHAIN_FILE="$ANDROID_NDK/build/cmake/android.toolchain.cmake" \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DBUILD_SHARED_LIBS=ON \
+    -DSHERPA_ONNX_ENABLE_PYTHON=OFF \
+    -DSHERPA_ONNX_ENABLE_TESTS=OFF \
+    -DSHERPA_ONNX_ENABLE_CHECK=OFF \
+    -DSHERPA_ONNX_ENABLE_PORTAUDIO=OFF \
+    -DSHERPA_ONNX_ENABLE_JNI=ON \
+    -DCMAKE_INSTALL_PREFIX=./install \
+    -DANDROID_ABI="arm64-v8a" \
+    -DANDROID_PLATFORM=android-21 ..
+# make VERBOSE=1 -j4
+make -j4
+make install/strip
+

 function(download_onnxruntime)
   include(FetchContent)
 
-  if(CMAKE_SYSTEM_NAME STREQUAL Linux)
+  message(STATUS "CMAKE_SYSTEM_NAME: ${CMAKE_SYSTEM_NAME}")
+  message(STATUS "CMAKE_SYSTEM_PROCESSOR: ${CMAKE_SYSTEM_PROCESSOR}")
+
   if(CMAKE_SYSTEM_PROCESSOR STREQUAL aarch64)
     # For embedded systems
     set(possible_file_locations
@@ -13,8 +15,7 @@ function(download_onnxruntime)
     )
     set(onnxruntime_URL  "https://github.com/microsoft/onnxruntime/releases/download/v1.14.0/onnxruntime-linux-aarch64-1.14.0.tgz")
     set(onnxruntime_HASH "SHA256=9384d2e6e29fed693a4630303902392eead0c41bee5705ccac6d6d34a3d5db86")
-
-    else()
+  elseif(CMAKE_SYSTEM_NAME STREQUAL Linux AND CMAKE_SYSTEM_PROCESSOR STREQUAL x86_64)
     # If you don't have access to the Internet,
     # please pre-download onnxruntime
     set(possible_file_locations
@@ -33,7 +34,6 @@ function(download_onnxruntime)
     #
     # ./include
     #    It contains all the needed header files
-    endif()
   elseif(APPLE)
     # If you don't have access to the Internet,
     # please pre-download onnxruntime
@@ -69,6 +69,8 @@ function(download_onnxruntime)
     # ./include
     #    It contains all the needed header files
   else()
+    message(STATUS "CMAKE_SYSTEM_NAME: ${CMAKE_SYSTEM_NAME}")
+    message(STATUS "CMAKE_SYSTEM_PROCESSOR: ${CMAKE_SYSTEM_PROCESSOR}")
     message(FATAL_ERROR "Only support Linux, macOS, and Windows at present. Will support other OSes later")
   endif()
 
@@ -91,11 +93,15 @@ function(download_onnxruntime)
   endif()
   message(STATUS "onnxruntime is downloaded to ${onnxruntime_SOURCE_DIR}")
 
+  if(ANDROID)
+    set(location_onnxruntime ${onnxruntime_SOURCE_DIR}/lib/libonnxruntime.so)
+  else()
     find_library(location_onnxruntime onnxruntime
       PATHS
       "${onnxruntime_SOURCE_DIR}/lib"
       NO_CMAKE_SYSTEM_PATH
     )
+  endif()
 
   message(STATUS "location_onnxruntime: ${location_onnxruntime}")
 

@@ -26,6 +26,10 @@ endif()
 
 add_library(sherpa-onnx-core ${sources})
 
+if(ANDROID_NDK)
+  target_link_libraries(sherpa-onnx-core android log)
+endif()
+
 target_link_libraries(sherpa-onnx-core
   onnxruntime
   kaldi-native-fbank-core

@@ -12,6 +12,11 @@
 #include <utility>
 #include <vector>
 
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#endif
+
 #include "onnxruntime_cxx_api.h"  // NOLINT
 #include "sherpa-onnx/csrc/cat.h"
 #include "sherpa-onnx/csrc/macros.h"
@@ -30,14 +35,53 @@ OnlineLstmTransducerModel::OnlineLstmTransducerModel(
   sess_opts_.SetIntraOpNumThreads(config.num_threads);
   sess_opts_.SetInterOpNumThreads(config.num_threads);
 
-  InitEncoder(config.encoder_filename);
-  InitDecoder(config.decoder_filename);
-  InitJoiner(config.joiner_filename);
+  {
+    auto buf = ReadFile(config.encoder_filename);
+    InitEncoder(buf.data(), buf.size());
+  }
+
+  {
+    auto buf = ReadFile(config.decoder_filename);
+    InitDecoder(buf.data(), buf.size());
+  }
+
+  {
+    auto buf = ReadFile(config.joiner_filename);
+    InitJoiner(buf.data(), buf.size());
+  }
+}
+
+#if __ANDROID_API__ >= 9
+OnlineLstmTransducerModel::OnlineLstmTransducerModel(
+    AAssetManager *mgr, const OnlineTransducerModelConfig &config)
+    : env_(ORT_LOGGING_LEVEL_WARNING),
+      config_(config),
+      sess_opts_{},
+      allocator_{} {
+  sess_opts_.SetIntraOpNumThreads(config.num_threads);
+  sess_opts_.SetInterOpNumThreads(config.num_threads);
+
+  {
+    auto buf = ReadFile(mgr, config.encoder_filename);
+    InitEncoder(buf.data(), buf.size());
+  }
+
+  {
+    auto buf = ReadFile(mgr, config.decoder_filename);
+    InitDecoder(buf.data(), buf.size());
+  }
+
+  {
+    auto buf = ReadFile(mgr, config.joiner_filename);
+    InitJoiner(buf.data(), buf.size());
+  }
 }
+#endif
 
-void OnlineLstmTransducerModel::InitEncoder(const std::string &filename) {
-  encoder_sess_ = std::make_unique<Ort::Session>(
-      env_, SHERPA_MAYBE_WIDE(filename).c_str(), sess_opts_);
+void OnlineLstmTransducerModel::InitEncoder(void *model_data,
+                                            size_t model_data_length) {
+  encoder_sess_ = std::make_unique<Ort::Session>(env_, model_data,
+                                                 model_data_length, sess_opts_);
 
   GetInputNames(encoder_sess_.get(), &encoder_input_names_,
                 &encoder_input_names_ptr_);
@@ -62,9 +106,10 @@ void OnlineLstmTransducerModel::InitEncoder(const std::string &filename) {
   SHERPA_ONNX_READ_META_DATA(d_model_, "d_model");
 }
 
-void OnlineLstmTransducerModel::InitDecoder(const std::string &filename) {
-  decoder_sess_ = std::make_unique<Ort::Session>(
-      env_, SHERPA_MAYBE_WIDE(filename).c_str(), sess_opts_);
+void OnlineLstmTransducerModel::InitDecoder(void *model_data,
+                                            size_t model_data_length) {
+  decoder_sess_ = std::make_unique<Ort::Session>(env_, model_data,
+                                                 model_data_length, sess_opts_);
 
   GetInputNames(decoder_sess_.get(), &decoder_input_names_,
                 &decoder_input_names_ptr_);
@@ -86,9 +131,10 @@ void OnlineLstmTransducerModel::InitDecoder(const std::string &filename) {
   SHERPA_ONNX_READ_META_DATA(context_size_, "context_size");
 }
 
-void OnlineLstmTransducerModel::InitJoiner(const std::string &filename) {
-  joiner_sess_ = std::make_unique<Ort::Session>(
-      env_, SHERPA_MAYBE_WIDE(filename).c_str(), sess_opts_);
+void OnlineLstmTransducerModel::InitJoiner(void *model_data,
+                                           size_t model_data_length) {
+  joiner_sess_ = std::make_unique<Ort::Session>(env_, model_data,
+                                                model_data_length, sess_opts_);
 
   GetInputNames(joiner_sess_.get(), &joiner_input_names_,
                 &joiner_input_names_ptr_);

@@ -9,6 +9,11 @@
 #include <utility>
 #include <vector>
 
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#endif
+
 #include "onnxruntime_cxx_api.h"  // NOLINT
 #include "sherpa-onnx/csrc/online-transducer-model-config.h"
 #include "sherpa-onnx/csrc/online-transducer-model.h"
@@ -19,6 +24,11 @@ class OnlineLstmTransducerModel : public OnlineTransducerModel {
  public:
   explicit OnlineLstmTransducerModel(const OnlineTransducerModelConfig &config);
 
+#if __ANDROID_API__ >= 9
+  OnlineLstmTransducerModel(AAssetManager *mgr,
+                            const OnlineTransducerModelConfig &config);
+#endif
+
   std::vector<Ort::Value> StackStates(
       const std::vector<std::vector<Ort::Value>> &states) const override;
 
@@ -47,9 +57,9 @@ class OnlineLstmTransducerModel : public OnlineTransducerModel {
   OrtAllocator *Allocator() override { return allocator_; }
 
  private:
-  void InitEncoder(const std::string &encoder_filename);
-  void InitDecoder(const std::string &decoder_filename);
-  void InitJoiner(const std::string &joiner_filename);
+  void InitEncoder(void *model_data, size_t model_data_length);
+  void InitDecoder(void *model_data, size_t model_data_length);
+  void InitJoiner(void *model_data, size_t model_data_length);
 
  private:
   Ort::Env env_;

@@ -55,6 +55,17 @@ class OnlineRecognizer::Impl {
         std::make_unique<OnlineTransducerGreedySearchDecoder>(model_.get());
   }
 
+#if __ANDROID_API__ >= 9
+  explicit Impl(AAssetManager *mgr, const OnlineRecognizerConfig &config)
+      : config_(config),
+        model_(OnlineTransducerModel::Create(mgr, config.model_config)),
+        sym_(mgr, config.tokens),
+        endpoint_(config_.endpoint_config) {
+    decoder_ =
+        std::make_unique<OnlineTransducerGreedySearchDecoder>(model_.get());
+  }
+#endif
+
   std::unique_ptr<OnlineStream> CreateStream() const {
     auto stream = std::make_unique<OnlineStream>(config_.feat_config);
     stream->SetResult(decoder_->GetEmptyResult());
@@ -156,6 +167,13 @@ class OnlineRecognizer::Impl {
 
 OnlineRecognizer::OnlineRecognizer(const OnlineRecognizerConfig &config)
     : impl_(std::make_unique<Impl>(config)) {}
+
+#if __ANDROID_API__ >= 9
+OnlineRecognizer::OnlineRecognizer(AAssetManager *mgr,
+                                   const OnlineRecognizerConfig &config)
+    : impl_(std::make_unique<Impl>(mgr, config)) {}
+#endif
+
 OnlineRecognizer::~OnlineRecognizer() = default;
 
 std::unique_ptr<OnlineStream> OnlineRecognizer::CreateStream() const {

@@ -8,6 +8,11 @@
 #include <memory>
 #include <string>
 
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#endif
+
 #include "sherpa-onnx/csrc/endpoint.h"
 #include "sherpa-onnx/csrc/features.h"
 #include "sherpa-onnx/csrc/online-stream.h"
@@ -45,6 +50,11 @@ struct OnlineRecognizerConfig {
 class OnlineRecognizer {
  public:
   explicit OnlineRecognizer(const OnlineRecognizerConfig &config);
+
+#if __ANDROID_API__ >= 9
+  OnlineRecognizer(AAssetManager *mgr, const OnlineRecognizerConfig &config);
+#endif
+
   ~OnlineRecognizer();
 
   /// Create a stream for decoding.

@@ -3,6 +3,11 @@
 // Copyright (c)  2023  Xiaomi Corporation
 #include "sherpa-onnx/csrc/online-transducer-model.h"
 
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#endif
+
 #include <memory>
 #include <sstream>
 #include <string>
@@ -18,15 +23,16 @@ enum class ModelType {
   kUnkown,
 };
 
-static ModelType GetModelType(const OnlineTransducerModelConfig &config) {
+static ModelType GetModelType(char *model_data, size_t model_data_length,
+                              bool debug) {
   Ort::Env env(ORT_LOGGING_LEVEL_WARNING);
   Ort::SessionOptions sess_opts;
 
-  auto sess = std::make_unique<Ort::Session>(
-      env, SHERPA_MAYBE_WIDE(config.encoder_filename).c_str(), sess_opts);
+  auto sess = std::make_unique<Ort::Session>(env, model_data, model_data_length,
+                                             sess_opts);
 
   Ort::ModelMetadata meta_data = sess->GetModelMetadata();
-  if (config.debug) {
+  if (debug) {
     std::ostringstream os;
     PrintModelMetadata(os, meta_data);
     fprintf(stderr, "%s\n", os.str().c_str());
@@ -52,7 +58,9 @@ static ModelType GetModelType(const OnlineTransducerModelConfig &config) {
 
 std::unique_ptr<OnlineTransducerModel> OnlineTransducerModel::Create(
     const OnlineTransducerModelConfig &config) {
-  auto model_type = GetModelType(config);
+  auto buffer = ReadFile(config.encoder_filename);
+
+  auto model_type = GetModelType(buffer.data(), buffer.size(), config.debug);
 
   switch (model_type) {
     case ModelType::kLstm:
@@ -67,4 +75,24 @@ std::unique_ptr<OnlineTransducerModel> OnlineTransducerModel::Create(
   return nullptr;
 }
 
+#if __ANDROID_API__ >= 9
+std::unique_ptr<OnlineTransducerModel> OnlineTransducerModel::Create(
+    AAssetManager *mgr, const OnlineTransducerModelConfig &config) {
+  auto buffer = ReadFile(mgr, config.encoder_filename);
+  auto model_type = GetModelType(buffer.data(), buffer.size(), config.debug);
+
+  switch (model_type) {
+    case ModelType::kLstm:
+      return std::make_unique<OnlineLstmTransducerModel>(mgr, config);
+    case ModelType::kZipformer:
+      return std::make_unique<OnlineZipformerTransducerModel>(mgr, config);
+    case ModelType::kUnkown:
+      return nullptr;
+  }
+
+  // unreachable code
+  return nullptr;
+}
+#endif
+
 }  // namespace sherpa_onnx

@@ -8,6 +8,11 @@
 #include <utility>
 #include <vector>
 
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#endif
+
 #include "onnxruntime_cxx_api.h"  // NOLINT
 #include "sherpa-onnx/csrc/online-transducer-model-config.h"
 
@@ -22,6 +27,11 @@ class OnlineTransducerModel {
   static std::unique_ptr<OnlineTransducerModel> Create(
       const OnlineTransducerModelConfig &config);
 
+#if __ANDROID_API__ >= 9
+  static std::unique_ptr<OnlineTransducerModel> Create(
+      AAssetManager *mgr, const OnlineTransducerModelConfig &config);
+#endif
+
   /** Stack a list of individual states into a batch.
    *
    * It is the inverse operation of `UnStackStates`.

@@ -13,6 +13,11 @@
 #include <utility>
 #include <vector>
 
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#endif
+
 #include "onnxruntime_cxx_api.h"  // NOLINT
 #include "sherpa-onnx/csrc/cat.h"
 #include "sherpa-onnx/csrc/macros.h"
@@ -32,14 +37,53 @@ OnlineZipformerTransducerModel::OnlineZipformerTransducerModel(
   sess_opts_.SetIntraOpNumThreads(config.num_threads);
   sess_opts_.SetInterOpNumThreads(config.num_threads);
 
-  InitEncoder(config.encoder_filename);
-  InitDecoder(config.decoder_filename);
-  InitJoiner(config.joiner_filename);
+  {
+    auto buf = ReadFile(config.encoder_filename);
+    InitEncoder(buf.data(), buf.size());
+  }
+
+  {
+    auto buf = ReadFile(config.decoder_filename);
+    InitDecoder(buf.data(), buf.size());
+  }
+
+  {
+    auto buf = ReadFile(config.joiner_filename);
+    InitJoiner(buf.data(), buf.size());
+  }
+}
+
+#if __ANDROID_API__ >= 9
+OnlineZipformerTransducerModel::OnlineZipformerTransducerModel(
+    AAssetManager *mgr, const OnlineTransducerModelConfig &config)
+    : env_(ORT_LOGGING_LEVEL_WARNING),
+      config_(config),
+      sess_opts_{},
+      allocator_{} {
+  sess_opts_.SetIntraOpNumThreads(config.num_threads);
+  sess_opts_.SetInterOpNumThreads(config.num_threads);
+
+  {
+    auto buf = ReadFile(mgr, config.encoder_filename);
+    InitEncoder(buf.data(), buf.size());
+  }
+
+  {
+    auto buf = ReadFile(mgr, config.decoder_filename);
+    InitDecoder(buf.data(), buf.size());
+  }
+
+  {
+    auto buf = ReadFile(mgr, config.joiner_filename);
+    InitJoiner(buf.data(), buf.size());
+  }
 }
+#endif
 
-void OnlineZipformerTransducerModel::InitEncoder(const std::string &filename) {
-  encoder_sess_ = std::make_unique<Ort::Session>(
-      env_, SHERPA_MAYBE_WIDE(filename).c_str(), sess_opts_);
+void OnlineZipformerTransducerModel::InitEncoder(void *model_data,
+                                                 size_t model_data_length) {
+  encoder_sess_ = std::make_unique<Ort::Session>(env_, model_data,
+                                                 model_data_length, sess_opts_);
 
   GetInputNames(encoder_sess_.get(), &encoder_input_names_,
                 &encoder_input_names_ptr_);
@@ -84,9 +128,10 @@ void OnlineZipformerTransducerModel::InitEncoder(const std::string &filename) {
   }
 }
 
-void OnlineZipformerTransducerModel::InitDecoder(const std::string &filename) {
-  decoder_sess_ = std::make_unique<Ort::Session>(
-      env_, SHERPA_MAYBE_WIDE(filename).c_str(), sess_opts_);
+void OnlineZipformerTransducerModel::InitDecoder(void *model_data,
+                                                 size_t model_data_length) {
+  decoder_sess_ = std::make_unique<Ort::Session>(env_, model_data,
+                                                 model_data_length, sess_opts_);
 
   GetInputNames(decoder_sess_.get(), &decoder_input_names_,
                 &decoder_input_names_ptr_);
@@ -108,9 +153,10 @@ void OnlineZipformerTransducerModel::InitDecoder(const std::string &filename) {
   SHERPA_ONNX_READ_META_DATA(context_size_, "context_size");
 }
 
-void OnlineZipformerTransducerModel::InitJoiner(const std::string &filename) {
-  joiner_sess_ = std::make_unique<Ort::Session>(
-      env_, SHERPA_MAYBE_WIDE(filename).c_str(), sess_opts_);
+void OnlineZipformerTransducerModel::InitJoiner(void *model_data,
+                                                size_t model_data_length) {
+  joiner_sess_ = std::make_unique<Ort::Session>(env_, model_data,
+                                                model_data_length, sess_opts_);
 
   GetInputNames(joiner_sess_.get(), &joiner_input_names_,
                 &joiner_input_names_ptr_);

@@ -9,6 +9,11 @@
 #include <utility>
 #include <vector>
 
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#endif
+
 #include "onnxruntime_cxx_api.h"  // NOLINT
 #include "sherpa-onnx/csrc/online-transducer-model-config.h"
 #include "sherpa-onnx/csrc/online-transducer-model.h"
@@ -20,6 +25,11 @@ class OnlineZipformerTransducerModel : public OnlineTransducerModel {
   explicit OnlineZipformerTransducerModel(
       const OnlineTransducerModelConfig &config);
 
+#if __ANDROID_API__ >= 9
+  OnlineZipformerTransducerModel(AAssetManager *mgr,
+                                 const OnlineTransducerModelConfig &config);
+#endif
+
   std::vector<Ort::Value> StackStates(
       const std::vector<std::vector<Ort::Value>> &states) const override;
 
@@ -48,9 +58,9 @@ class OnlineZipformerTransducerModel : public OnlineTransducerModel {
   OrtAllocator *Allocator() override { return allocator_; }
 
  private:
-  void InitEncoder(const std::string &encoder_filename);
-  void InitDecoder(const std::string &decoder_filename);
-  void InitJoiner(const std::string &joiner_filename);
+  void InitEncoder(void *model_data, size_t model_data_length);
+  void InitDecoder(void *model_data, size_t model_data_length);
+  void InitJoiner(void *model_data, size_t model_data_length);
 
  private:
   Ort::Env env_;

@@ -3,9 +3,16 @@
 // Copyright (c)  2023  Xiaomi Corporation
 #include "sherpa-onnx/csrc/onnx-utils.h"
 
+#include <fstream>
 #include <string>
 #include <vector>
 
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#include "android/log.h"
+#endif
+
 #include "onnxruntime_cxx_api.h"  // NOLINT
 
 namespace sherpa_onnx {
@@ -116,4 +123,30 @@ void Print3D(Ort::Value *v) {
   fprintf(stderr, "\n");
 }
 
+std::vector<char> ReadFile(const std::string &filename) {
+  std::ifstream input(filename, std::ios::binary);
+  std::vector<char> buffer(std::istreambuf_iterator<char>(input), {});
+  return buffer;
+}
+
+#if __ANDROID_API__ >= 9
+std::vector<char> ReadFile(AAssetManager *mgr, const std::string &filename) {
+  AAsset *asset = AAssetManager_open(mgr, filename.c_str(), AASSET_MODE_BUFFER);
+  if (!asset) {
+    __android_log_print(ANDROID_LOG_FATAL, "sherpa-onnx",
+                        "Read binary file: Load %s failed", filename.c_str());
+    exit(-1);
+  }
+
+  auto p = reinterpret_cast<const char *>(AAsset_getBuffer(asset));
+  size_t asset_length = AAsset_getLength(asset);
+
+  AAsset_close(asset);
+
+  std::vector<char> buffer(p, p + asset_length);
+
+  return buffer;
+}
+#endif
+
 }  // namespace sherpa_onnx

@@ -14,6 +14,11 @@
 #include <string>
 #include <vector>
 
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#endif
+
 #include "onnxruntime_cxx_api.h"  // NOLINT
 
 namespace sherpa_onnx {
@@ -74,6 +79,12 @@ void Fill(Ort::Value *tensor, T value) {
   std::fill(p, p + n, value);
 }
 
+std::vector<char> ReadFile(const std::string &filename);
+
+#if __ANDROID_API__ >= 9
+std::vector<char> ReadFile(AAssetManager *mgr, const std::string &filename);
+#endif
+
 }  // namespace sherpa_onnx
 
 #endif  // SHERPA_ONNX_CSRC_ONNX_UTILS_H_

@@ -7,11 +7,32 @@
 #include <cassert>
 #include <fstream>
 #include <sstream>
+#include <strstream>
+
+#include "sherpa-onnx/csrc/onnx-utils.h"
+
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#endif
 
 namespace sherpa_onnx {
 
 SymbolTable::SymbolTable(const std::string &filename) {
   std::ifstream is(filename);
+  Init(is);
+}
+
+#if __ANDROID_API__ >= 9
+SymbolTable::SymbolTable(AAssetManager *mgr, const std::string &filename) {
+  auto buf = ReadFile(mgr, filename);
+
+  std::istrstream is(buf.data(), buf.size());
+  Init(is);
+}
+#endif
+
+void SymbolTable::Init(std::istream &is) {
   std::string sym;
   int32_t id;
   while (is >> sym >> id) {

@@ -8,6 +8,11 @@
 #include <string>
 #include <unordered_map>
 
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#endif
+
 namespace sherpa_onnx {
 
 /// It manages mapping between symbols and integer IDs.
@@ -22,6 +27,10 @@ class SymbolTable {
   /// Fields are separated by space(s).
   explicit SymbolTable(const std::string &filename);
 
+#if __ANDROID_API__ >= 9
+  SymbolTable(AAssetManager *mgr, const std::string &filename);
+#endif
+
   /// Return a string representation of this symbol table
   std::string ToString() const;
 
@@ -37,6 +46,9 @@ class SymbolTable {
   bool contains(const std::string &sym) const;
 
  private:
+  void Init(std::istream &is);
+
+ private:
   std::unordered_map<std::string, int32_t> sym2id_;
   std::unordered_map<int32_t, std::string> id2sym_;
 };

@@ -20,7 +20,7 @@
 #endif
 
 #if __ANDROID_API__ >= 8
-#include <android/log.h>
+#include "android/log.h"
 #define SHERPA_ONNX_LOGE(...)                                            \
   do {                                                                   \
     fprintf(stderr, ##__VA_ARGS__);                                      \