Throw exception when adding more than 5 tabs

android/app/src/main/java/com/reactnativenavigation/layout/bottomtabs/BottomTabs.java

@@ -16,7 +16,7 @@ import static android.widget.RelativeLayout.ALIGN_PARENT_BOTTOM;
 
 public class BottomTabs implements BottomNavigationView.OnNavigationItemSelectedListener {
 
-    public interface BottomTabsSelectionListener {
+    interface BottomTabsSelectionListener {
         void onTabSelected(int index);
     }
 
@@ -35,15 +35,15 @@ public class BottomTabs implements BottomNavigationView.OnNavigationItemSelected
     }
 
     public void add(String label) {
-        int tabId = getTabsCount();
+        int tabId = size();
         bottomNavigationView.getMenu().add(0, tabId, Menu.NONE, label);
     }
 
-    public int getTabsCount() {
+    public int size() {
         return bottomNavigationView.getMenu().size();
     }
 
-    public int getViewId() {
+    int getViewId() {
         return bottomNavigationView.getId();
     }
 

android/app/src/main/java/com/reactnativenavigation/layout/bottomtabs/BottomTabsContainer.java

@@ -15,11 +15,13 @@ public class BottomTabsContainer extends RelativeLayout implements BottomTabs.Bo
 
     public BottomTabsContainer(Activity activity, BottomTabs bottomTabs) {
         super(activity);
-
         initBottomTabs(bottomTabs);
     }
 
     public void addTabContent(String label, View tabContent) {
+        if (tabsContent.size() > 5) {
+            throw new TooManyTabsException();
+        }
         bottomTabs.add(label);
         attachTabContent(tabContent);
         tabsContent.add(tabContent);

android/app/src/main/java/com/reactnativenavigation/layout/bottomtabs/TooManyTabsException.java

@@ -0,0 +1,4 @@
+package com.reactnativenavigation.layout.bottomtabs;
+
+public class TooManyTabsException extends RuntimeException {
+}

android/app/src/test/java/com/reactnativenavigation/BottomTabsContainerTest.java

@@ -5,6 +5,7 @@ import android.view.View;
 
 import com.reactnativenavigation.layout.bottomtabs.BottomTabs;
 import com.reactnativenavigation.layout.bottomtabs.BottomTabsContainer;
+import com.reactnativenavigation.layout.bottomtabs.TooManyTabsException;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -64,6 +65,15 @@ public class BottomTabsContainerTest {
         TestUtils.assertViewChildren(bottomTabsContainer, tabContent, otherTabContent);
     }
 
+    @Test (expected = TooManyTabsException.class)
+    public void throwsExceptionWhenMoreThenFiveTabs() throws Exception {
+        BottomTabsContainer bottomTabsContainer = createBottomTabsContainer();
+        for (int i = 0; i <= 6; i++) {
+            View content = new View(activity);
+            bottomTabsContainer.addTabContent("#" + i, content);
+        }
+    }
+
     @Test
     public void onlyFirstTabShouldBeVisible() throws Exception {
         View tabContent = new View(activity);

android/app/src/test/java/com/reactnativenavigation/LayoutFactoryTest.java

@@ -100,7 +100,7 @@ public class LayoutFactoryTest {
     @Test
     public void returnsSingleTabContent() throws Exception {
         BottomTabs bottomTabsMock = mock(BottomTabs.class);
-        when(bottomTabsMock.getTabsCount()).thenReturn(0);
+        when(bottomTabsMock.size()).thenReturn(0);
 
         when(rootViewCreator.createRootView(eq(VIEW_ID), eq(VIEW_NAME))).thenReturn(mockView);
         final LayoutNode containerNode = createContainerNode();
@@ -119,7 +119,7 @@ public class LayoutFactoryTest {
     @Test
     public void returnsTwoTabContent() throws Exception {
         BottomTabs bottomTabsMock = mock(BottomTabs.class);
-        when(bottomTabsMock.getTabsCount()).thenReturn(0, 1);
+        when(bottomTabsMock.size()).thenReturn(0, 1);
 
         when(rootViewCreator.createRootView(eq(VIEW_ID), eq(VIEW_NAME))).thenReturn(mockView);
         final LayoutNode firstTabRootNode = createContainerNode(VIEW_ID, VIEW_NAME);
@@ -136,6 +136,7 @@ public class LayoutFactoryTest {
         verify(bottomTabsMock).add(eq("#1"));
     }
 
+
     @Test(expected = IllegalArgumentException.class)
     public void throwsExceptionForUnknownType() throws Exception {
         when(rootViewCreator.createRootView(eq(VIEW_ID), eq(VIEW_NAME))).thenReturn(mockView);