Add no device pluggued message in the Browse Device Fragment

Fixes #3

app/src/main/java/fr/mobdev/lpcprog/fragment/BrowseDeviceFragment.java

@@ -26,6 +26,7 @@ import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.TextView;
 
 import java.util.List;
 
@@ -82,6 +83,12 @@ public class BrowseDeviceFragment extends Fragment {
         if(v == null)
             v = getView();
         assert v != null;
+        TextView nodevice = v.findViewById(R.id.no_device);
+        if(devices.size() == 0) {
+            nodevice.setVisibility(View.VISIBLE);
+        } else {
+            nodevice.setVisibility(View.GONE);
+        }
         DeviceAdapter adapter = new DeviceAdapter(devices,listener);
         RecyclerView view = v.findViewById(R.id.device_list);
         view.setAdapter(adapter);

app/src/main/res/layout/usb_list.xml

@@ -9,7 +9,15 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     >
+    <TextView
+        android:layout_alignParentTop="true"
+        android:id="@+id/no_device"
+        android:text="@string/no_device"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        />
     <android.support.v4.widget.SwipeRefreshLayout
+        android:layout_below="@+id/no_device"
         android:id="@+id/swipe_refresh"
         android:layout_width="match_parent"
         android:layout_height="match_parent">

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

@@ -87,6 +87,7 @@
     <string name="retry_download">Retry Download Binary</string>
     <string name="download_binary">Download Binary</string>
     <string name="informations">Informations</string>
+    <string name="no_device">No Device Pluggued, please plug one to be able to flash a binary on it.</string>
     <array name="uuencode_array">
         <item>Yes</item>
         <item>No</item>