Refactor flutter to support Android (#1072)

scripts/dart/non-streaming-asr-pubspec.yaml

@@ -10,7 +10,7 @@ environment:
 # Add regular dependencies here.
 dependencies:
   sherpa_onnx:
-    path: ../../sherpa-onnx/flutter
+    path: ../../flutter/sherpa_onnx
 
   path: ^1.9.0
   args: ^2.5.0

scripts/dart/sherpa-onnx-pubspec.yaml

@@ -0,0 +1,58 @@
+name: sherpa_onnx
+
+description: >
+  Speech recognition, speech synthesis, and speaker recognition using next-gen Kaldi
+  with onnxruntime without Internet connection.
+
+repository: https://github.com/k2-fsa/sherpa-onnx/tree/master/sherpa-onnx/flutter
+
+issue_tracker: https://github.com/k2-fsa/sherpa-onnx/issues
+documentation: https://k2-fsa.github.io/sherpa/onnx/
+
+topics:
+  - speech-recognition
+  - speech-synthesis
+  - speaker-identification
+  - audio-tagging
+  - voice-activity-detection
+
+# remember to change the version in ../sherpa_onnx_macos/macos/sherpa_onnx.podspec
+version: 1.10.6
+
+homepage: https://github.com/k2-fsa/sherpa-onnx
+
+environment:
+  sdk: '>=3.4.0 <4.0.0'
+  flutter: '>=3.3.0'
+
+dependencies:
+  ffi: ^2.1.0
+  flutter:
+    sdk: flutter
+
+  sherpa_onnx_android:
+    path: ../sherpa_onnx_android
+
+  sherpa_onnx_macos:
+    path: ../sherpa_onnx_macos
+
+  sherpa_onnx_linux:
+    path: ../sherpa_onnx_linux
+
+  sherpa_onnx_windows:
+    path: ../sherpa_onnx_windows
+
+flutter:
+  plugin:
+    platforms:
+      android:
+        default_package: sherpa_onnx_android
+
+      macos:
+        default_package: sherpa_onnx_macos
+
+      linux:
+        default_package: sherpa_onnx_linux
+
+      windows:
+        default_package: sherpa_onnx_windows

scripts/dart/streaming-asr-pubspec.yaml

@@ -12,7 +12,8 @@ environment:
 # Add regular dependencies here.
 dependencies:
   sherpa_onnx:
-    path: ../../sherpa-onnx/flutter
+    path: ../../flutter/sherpa_onnx
+
   path: ^1.9.0
   args: ^2.5.0
 

scripts/dart/tts-pubspec.yaml

@@ -9,7 +9,8 @@ environment:
 # Add regular dependencies here.
 dependencies:
   sherpa_onnx:
-    path: ../../sherpa-onnx/flutter
+    path: ../../flutter/sherpa_onnx
+
   path: ^1.9.0
   args: ^2.5.0
 

scripts/dart/vad-pubspec.yaml

@@ -10,7 +10,8 @@ environment:
 
 dependencies:
   sherpa_onnx:
-    path: ../../sherpa-onnx/flutter
+    path: ../../flutter/sherpa_onnx
+
   path: ^1.9.0
   args: ^2.5.0