Refactor flutter to support Android (#1072)

flutter/sherpa_onnx_android/example/.gitignore

@@ -0,0 +1,43 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

flutter/sherpa_onnx_android/example/README.md

@@ -0,0 +1,9 @@
+# Introduction
+
+Please find examples at
+
+https://github.com/k2-fsa/sherpa-onnx/tree/master/flutter-examples
+
+and
+
+https://github.com/k2-fsa/sherpa-onnx/tree/master/dart-api-examples

flutter/sherpa_onnx_android/example/example.md

@@ -0,0 +1,18 @@
+# sherpa-onnx app example
+
+## Streaming speech recognition
+
+Please see https://github.com/k2-fsa/sherpa-onnx/tree/master/dart-api-examples/streaming-asr
+
+## Non-streaming speech recognition
+
+Please see https://github.com/k2-fsa/sherpa-onnx/tree/master/dart-api-examples/non-streaming-asr
+
+## Text to speech (TTS)
+
+Please see https://github.com/k2-fsa/sherpa-onnx/tree/master/dart-api-examples/tts
+
+## Voice activity detection (VAD)
+
+Please see https://github.com/k2-fsa/sherpa-onnx/tree/master/dart-api-examples/vad
+