java/android/app/src/main/res/layout/activity_helloworld.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
              android:layout_height="match_parent"
              tools:context=".MainActivity"
              android:orientation="vertical" >

    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
        <EditText
                android:id="@+id/host_edit_text"
                android:layout_weight="2"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:hint="Enter Host" />
        <EditText
                android:id="@+id/port_edit_text"
                android:layout_weight="1"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:inputType="numberDecimal"
                android:hint="Enter Port" />
    </LinearLayout>


    <EditText
            android:id="@+id/message_edit_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Enter message to send" />

    <Button
            android:id="@+id/send_button"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:onClick="sendMessage"
            android:text="Send Grpc Request" />

    <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingTop="12dp"
            android:paddingBottom="12dp"
            android:textSize="16dp"
            android:text="Response:" />

    <TextView
            android:id="@+id/grpc_response_text"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:textSize="16dp" />

</LinearLayout>