Fixes selection on multi-link that doesn't work and cause crash

Fixes 19,20

app/src/main/java/fr/mobdev/goblim/MultiLinkAdapter.java

@@ -69,9 +69,9 @@ public class MultiLinkAdapter extends RecyclerView.Adapter<MultiLinkViewHolder>{
                     box = (CheckBox) v.findViewById(R.id.selected);
                 }
                 if(box.isChecked() && !selecteds.contains(holder.index)) {
-                    selecteds.add(holder.index);
-                } else {
-                    selecteds.remove(holder.index);
+                    selecteds.set(holder.index,holder.index);
+                } else if (!box.isChecked() && selecteds.contains(holder.index)) {
+                    selecteds.set(holder.index,-1);
                 }
                 selectionListener.onSelectionChanged();
             }
@@ -95,7 +95,9 @@ public class MultiLinkAdapter extends RecyclerView.Adapter<MultiLinkViewHolder>{
             holder.progress.setVisibility(View.VISIBLE);
             holder.thumb.setVisibility(View.GONE);
         }
-        holder.box.setChecked(selecteds.contains(position));
+
+        holder.box.setChecked(selecteds.get(position) != -1);
+        holder.index = position;
     }
 
     @Override

app/src/main/java/fr/mobdev/goblim/activity/MultiLinkActivity.java

@@ -210,7 +210,8 @@ public class MultiLinkActivity extends AppCompatActivity {
                                 List<Integer> selected = adapter.getSelecteds();
                                 List<String> urls = new ArrayList<>();
                                 for(Integer index : selected) {
-                                    urls.add(deleteUrls.get(index));
+                                    if(index != -1)
+                                        urls.add(deleteUrls.get(index));
                                 }
                                 NetworkManager.getInstance(listener).deleteMultiple(MultiLinkActivity.this, urls);
                             }
@@ -230,7 +231,8 @@ public class MultiLinkActivity extends AppCompatActivity {
         List<Integer> selected = adapter.getSelecteds();
         String output = baseUrl;
         for(Integer index : selected) {
-            output += sharedHashs.get(index)+",";
+            if(index != -1)
+                output += sharedHashs.get(index)+",";
         }
         return output;
     }

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

@@ -5,14 +5,6 @@
     android:layout_margin="5dp"
     >
 
-    <CheckBox
-        android:layout_alignParentTop="true"
-        android:layout_alignParentEnd="true"
-        android:layout_alignParentRight="true"
-        android:id="@+id/selected"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content" />
-
     <ProgressBar
         android:id="@+id/progress"
         android:layout_centerVertical="true"
@@ -29,4 +21,13 @@
         android:layout_gravity="center_horizontal"
         />
 
+
+    <CheckBox
+        android:layout_alignParentTop="true"
+        android:layout_alignParentEnd="true"
+        android:layout_alignParentRight="true"
+        android:id="@+id/selected"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
 </RelativeLayout>