sample UI fix

Author: guaishouN

sample/src/main/java/com/gyso/gysotreeviewapplication/MainActivity.java

@@ -117,11 +117,6 @@ void doYourOwnJobs(TreeViewEditor editor, AnimalTreeViewAdapter adapter){
             editor.removeNode(toRemoveNode);
         });
 
-        //remove node
-        binding.removeChildrenBt.setOnClickListener(v->{
-            editor.removeNodeChildren(parentToRemoveChildren);
-        });
-
         adapter.setOnItemListener((item, node)-> {
             Animal animal = node.getValue();
             Toast.makeText(this,"you click the head of "+animal,Toast.LENGTH_SHORT).show();

sample/src/main/res/layout/activity_main.xml

@@ -67,20 +67,6 @@
                 android:foreground="?attr/selectableItemBackground"
                 app:layout_constraintLeft_toRightOf="@+id/add_nodes_bt"
                 app:layout_constraintTop_toTopOf="parent" />
-            <TextView
-                android:id="@+id/remove_children_bt"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_margin="5dp"
-                android:padding="6dp"
-                android:checked="false"
-                android:text="REMOVE C"
-                android:textStyle="bold"
-                android:textColor="@android:color/white"
-                android:background="@drawable/drag_mode_bg"
-                android:foreground="?attr/selectableItemBackground"
-                app:layout_constraintLeft_toRightOf="@+id/add_nodes_bt"
-                app:layout_constraintTop_toTopOf="parent" />
         </LinearLayout>
         <com.google.android.material.switchmaterial.SwitchMaterial
             android:id="@+id/drag_edit_mode_rd"