Add two-pass speech recognition Android/iOS demo (#304)

sherpa-onnx/csrc/offline-ctc-model.h

@@ -8,6 +8,11 @@
 #include <string>
 #include <utility>
 
+#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/offline-model-config.h"
 
@@ -16,9 +21,15 @@ namespace sherpa_onnx {
 class OfflineCtcModel {
  public:
   virtual ~OfflineCtcModel() = default;
+
   static std::unique_ptr<OfflineCtcModel> Create(
       const OfflineModelConfig &config);
 
+#if __ANDROID_API__ >= 9
+  static std::unique_ptr<OfflineCtcModel> Create(
+      AAssetManager *mgr, const OfflineModelConfig &config);
+#endif
+
   /** Run the forward method of the model.
    *
    * @param features  A tensor of shape (N, T, C). It is changed in-place.