Android: Prevent showing mapping dialog with no device selected

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsAdapter.java

@@ -312,6 +312,15 @@ public final class SettingsAdapter extends RecyclerView.Adapter<SettingViewHolde
 
   public void onInputMappingClick(final InputMappingControlSetting item, final int position)
   {
+    if (item.getController().getDefaultDevice().isEmpty() && !mView.isMappingAllDevices())
+    {
+      new MaterialAlertDialogBuilder(mView.getActivity())
+              .setMessage(R.string.input_binding_no_device)
+              .setPositiveButton(R.string.ok, this)
+              .show();
+      return;
+    }
+
     final MotionAlertDialog dialog = new MotionAlertDialog(mView.getActivity(), item,
             mView.isMappingAllDevices());
 

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

@@ -33,6 +33,7 @@
 
     <string name="input_binding">Input Binding</string>
     <string name="input_binding_description">Press or move an input to bind it to %1$s.</string>
+    <string name="input_binding_no_device">You need to select a device first!</string>
 
     <!-- Main Preference Fragment -->
     <string name="settings">Settings</string>