Add APIs to TabLayout to get selected tab position

BUG: 21796426
Change-Id: I6570a224780a37924576f62a9967cd4d8654fbb0

2 files changed, 19 insertions, 1 deletions

diff --git a/design/api/current.txt b/design/api/current.txt
index 9dc6e20b9b..b3a6a04da8 100644
--- a/design/api/current.txt
+++ b/design/api/current.txt
@@ -194,13 +194,13 @@ package android.support.design.widget {
     method public android.view.View inflateHeaderView(int);
     method public void inflateMenu(int);
     method public void removeHeaderView(android.view.View);
+    method public void setCheckedItem(int);
     method public void setItemBackground(android.graphics.drawable.Drawable);
     method public void setItemBackgroundResource(int);
     method public void setItemIconTintList(android.content.res.ColorStateList);
     method public void setItemTextAppearance(int);
     method public void setItemTextColor(android.content.res.ColorStateList);
     method public void setNavigationItemSelectedListener(android.support.design.widget.NavigationView.OnNavigationItemSelectedListener);
-    method public void setCheckedItem(int);
   }
 
   public static abstract interface NavigationView.OnNavigationItemSelectedListener {
@@ -269,6 +269,7 @@ package android.support.design.widget {
     method public void addTab(android.support.design.widget.TabLayout.Tab, int);
     method public void addTab(android.support.design.widget.TabLayout.Tab, boolean);
     method public void addTab(android.support.design.widget.TabLayout.Tab, int, boolean);
+    method public int getSelectedTabPosition();
     method public android.support.design.widget.TabLayout.Tab getTabAt(int);
     method public int getTabCount();
     method public int getTabGravity();
@@ -306,6 +307,7 @@ package android.support.design.widget {
     method public int getPosition();
     method public java.lang.Object getTag();
     method public java.lang.CharSequence getText();
+    method public boolean isSelected();
     method public void select();
     method public android.support.design.widget.TabLayout.Tab setContentDescription(int);
     method public android.support.design.widget.TabLayout.Tab setContentDescription(java.lang.CharSequence);
diff --git a/design/src/android/support/design/widget/TabLayout.java b/design/src/android/support/design/widget/TabLayout.java
index 6e0153a8e7..3639261df2 100755
--- a/design/src/android/support/design/widget/TabLayout.java
+++ b/design/src/android/support/design/widget/TabLayout.java
@@ -426,6 +426,15 @@ public class TabLayout extends HorizontalScrollView {
     }
 
     /**
+     * Returns the position of the current selected tab.
+     *
+     * @return selected tab position, or {@code -1} if there isn't a selected tab.
+     */
+    public int getSelectedTabPosition() {
+        return mSelectedTab != null ? mSelectedTab.getPosition() : -1;
+    }
+
+    /**
      * Remove a tab from the layout. If the removed tab was selected it will be deselected
      * and another tab will be selected if present.
      *
@@ -1045,6 +1054,13 @@ public class TabLayout extends HorizontalScrollView {
         }
 
         /**
+         * Returns true if this tab is currently selected.
+         */
+        public boolean isSelected() {
+            return mParent.getSelectedTabPosition() == mPosition;
+        }
+
+        /**
          * Set a description of this tab's content for use in accessibility support. If no content
          * description is provided the title will be used.
          *