example app with event-based or direct read

usbSerialExamples/src/main/res/layout/fragment_terminal.xml

@@ -93,6 +93,12 @@
         android:textAppearance="@style/TextAppearance.AppCompat.Medium"
         android:typeface="monospace" />
 
+    <Button
+        android:id="@+id/receive_btn"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Read" />
+
     <View
         android:layout_width="match_parent"
         android:background="?android:attr/listDivider"

usbSerialExamples/src/main/res/menu/menu_devices.xml

@@ -6,4 +6,7 @@
     <item
         android:id="@+id/baud_rate"
         android:title="Baud rate" />
+    <item
+        android:id="@+id/read_mode"
+        android:title="Read mode" />
 </menu>

usbSerialExamples/src/main/res/values/arrays.xml

@@ -7,4 +7,8 @@
         <item>57600</item>
         <item>115200</item>
     </string-array>
+    <string-array name="read_modes">
+        <item>event: SerialInputOutputManager.onNewData()</item>
+        <item>direct: UsbSerialPort.read()</item>
+    </string-array>
 </resources>