bottom tabs

lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/BottomTabsController.java

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+package com.reactnativenavigation.viewcontrollers;
+
+import android.app.Activity;
+import android.graphics.Color;
+import android.support.annotation.NonNull;
+import android.support.design.widget.BottomNavigationView;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.RelativeLayout;
+
+import com.reactnativenavigation.utils.CompatUtils;
+
+import java.util.List;
+
+import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
+import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
+import static android.widget.RelativeLayout.ABOVE;
+import static android.widget.RelativeLayout.ALIGN_PARENT_BOTTOM;
+
+public class BottomTabsController extends ViewController implements BottomNavigationView.OnNavigationItemSelectedListener {
+	private BottomNavigationView bottomNavigationView;
+	private int selectedIndex = 0;
+	private List<ViewController> tabs;
+
+	public BottomTabsController(final Activity activity, final String id) {
+		super(activity, id);
+	}
+
+	@NonNull
+	@Override
+	protected RelativeLayout createView() {
+		RelativeLayout root = new RelativeLayout(getActivity());
+		bottomNavigationView = new BottomNavigationView(getActivity());
+		bottomNavigationView.setId(CompatUtils.generateViewId());
+		bottomNavigationView.setBackgroundColor(Color.DKGRAY);
+		bottomNavigationView.setOnNavigationItemSelectedListener(this);
+		RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(MATCH_PARENT, WRAP_CONTENT);
+		lp.addRule(ALIGN_PARENT_BOTTOM);
+		bottomNavigationView.setLayoutParams(lp);
+		root.addView(bottomNavigationView, lp);
+		return root;
+	}
+
+	@NonNull
+	@Override
+	public RelativeLayout getView() {
+		return (RelativeLayout) super.getView();
+	}
+
+	@Override
+	public boolean onNavigationItemSelected(@NonNull final MenuItem item) {
+		selectedIndex = item.getItemId();
+		for (ViewController tab : tabs) {
+			tab.getView().setVisibility(View.GONE);
+		}
+		tabs.get(selectedIndex).getView().setVisibility(View.VISIBLE);
+		return true;
+	}
+
+	public void setTabs(final List<ViewController> tabs) {
+		if (tabs.size() > 5) {
+			throw new RuntimeException("Too many tabs!");
+		}
+		this.tabs = tabs;
+		getView();
+		for (int i = 0; i < tabs.size(); i++) {
+			ViewController tab = tabs.get(i);
+			bottomNavigationView.getMenu().add(0, i, Menu.NONE, String.valueOf(i));
+			RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(MATCH_PARENT, MATCH_PARENT);
+			params.addRule(ABOVE, bottomNavigationView.getId());
+			getView().addView(tab.getView(), params);
+			if (i > 0) {
+				tab.getView().setVisibility(View.GONE);
+			}
+		}
+	}
+
+	public List<ViewController> getTabs() {
+		return tabs;
+	}
+
+	public int getSelectedIndex() {
+		return selectedIndex;
+	}
+}

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/BottomTabsControllerTest.java

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+package com.reactnativenavigation.viewcontrollers;
+
+import android.app.Activity;
+import android.support.annotation.NonNull;
+import android.support.design.widget.BottomNavigationView;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.RelativeLayout;
+
+import com.reactnativenavigation.BaseTest;
+import com.reactnativenavigation.mocks.SimpleViewController;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.assertj.core.api.Java6Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+public class BottomTabsControllerTest extends BaseTest {
+
+	private Activity activity;
+	private BottomTabsController uut;
+	private ViewController child1;
+	private ViewController child2;
+	private ViewController child3;
+
+	@Override
+	public void beforeEach() {
+		super.beforeEach();
+		activity = newActivity();
+		uut = new BottomTabsController(activity, "uut");
+		child1 = new SimpleViewController(activity, "child1");
+		child2 = new SimpleViewController(activity, "child2");
+		child3 = new SimpleViewController(activity, "child3");
+	}
+
+	@Test
+	public void containsRelativeLayoutView() throws Exception {
+		assertThat(uut.getView()).isInstanceOf(RelativeLayout.class);
+		assertThat(uut.getView().getChildAt(0)).isInstanceOf(BottomNavigationView.class);
+	}
+
+	@Test(expected = RuntimeException.class)
+	public void setTabs_ThrowWhenMoreThan5() throws Exception {
+		List<ViewController> tabs = createTabs();
+		tabs.add(new SimpleViewController(activity, "6"));
+		uut.setTabs(tabs);
+	}
+
+	@Test
+	public void setTabs_AddAllViewsAsGoneExceptFirst() throws Exception {
+		List<ViewController> tabs = createTabs();
+		uut.setTabs(tabs);
+		assertThat(uut.getView().getChildCount()).isEqualTo(6);
+		assertThat(uut.getView().getChildAt(1).getVisibility()).isEqualTo(View.VISIBLE);
+		assertThat(uut.getView().getChildAt(2).getVisibility()).isEqualTo(View.GONE);
+		assertThat(uut.getView().getChildAt(3).getVisibility()).isEqualTo(View.GONE);
+		assertThat(uut.getView().getChildAt(4).getVisibility()).isEqualTo(View.GONE);
+		assertThat(uut.getView().getChildAt(5).getVisibility()).isEqualTo(View.GONE);
+	}
+
+	@Test
+	public void onTabSelected_SelectsTab() throws Exception {
+		uut.setTabs(createTabs());
+		assertThat(uut.getSelectedIndex()).isZero();
+
+		MenuItem menuItem = mock(MenuItem.class);
+		when(menuItem.getItemId()).thenReturn(3);
+		assertThat(uut.onNavigationItemSelected(menuItem)).isTrue();
+
+		assertThat(uut.getSelectedIndex()).isEqualTo(3);
+		assertThat(uut.getTabs().get(0).getView().getVisibility()).isEqualTo(View.GONE);
+		assertThat(uut.getTabs().get(1).getView().getVisibility()).isEqualTo(View.GONE);
+		assertThat(uut.getTabs().get(2).getView().getVisibility()).isEqualTo(View.GONE);
+		assertThat(uut.getTabs().get(3).getView().getVisibility()).isEqualTo(View.VISIBLE);
+		assertThat(uut.getTabs().get(4).getView().getVisibility()).isEqualTo(View.GONE);
+	}
+
+	@NonNull
+	private List<ViewController> createTabs() {
+		List<ViewController> tabs = new ArrayList<>();
+		tabs.add(new SimpleViewController(activity, "1"));
+		tabs.add(new SimpleViewController(activity, "2"));
+		tabs.add(new SimpleViewController(activity, "3"));
+		tabs.add(new SimpleViewController(activity, "4"));
+		tabs.add(new SimpleViewController(activity, "5"));
+		return tabs;
+	}
+}