Refactor the JNI interface to make it more modular and maintainable (#802)

android/SherpaOnnxVadAsr/app/src/main/res/layout/activity_main.xml

@@ -4,7 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".MainActivity">
+    tools:context=".vad.asr.MainActivity">
 
     <LinearLayout
         android:layout_width="match_parent"

android/SherpaOnnxVadAsr/app/src/main/res/values/strings.xml

@@ -1,5 +1,5 @@
 <resources>
-    <string name="app_name">VAD-ASR</string>
+    <string name="app_name">VAD+ASR</string>
     <string name="hint">Click the Start button to play speech-to-text with Next-gen Kaldi.
         \n
         \n\n\n