Change image on Tab in TabLayout when Selected

Question

I am using Design TabLayout,

Answer 1

add the setOnTabSelectedListener to the tabLayout object

i named mine navigation

navigation.setOnTabSelectedListener(
            new TabLayout.ViewPagerOnTabSelectedListener(mainView) {

                @Override
                public void onTabSelected(TabLayout.Tab tab) {
                    super.onTabSelected(tab);

                    // 1. get the custom View you've added
                    View tabView = tab.getCustomView();

                    // get inflated children Views the icon and the label by their id
                    TextView tab_label = (TextView) tabView.findViewById(R.id.nav_label);
                    ImageView tab_icon = (ImageView) tabView.findViewById(R.id.nav_icon);

                    // change the label color, by getting the color resource value
                    tab_label.setTextColor(getResources().getColor(R.color.active_color));
                    // change the image Resource
                    // i defined all icons in an array ordered in order of tabs appearances
                    // call tab.getPosition() to get active tab index.
                    tab_icon.setImageResource(navIconsActive[tab.getPosition()]);
                }

                // do as the above the opposite way to reset tab when state is changed 
                // as it not the active one any more
                @Override
                public void onTabUnselected(TabLayout.Tab tab) {
                    super.onTabUnselected(tab);
                    View tabView = tab.getCustomView();
                    TextView tab_label = (TextView) tabView.findViewById(R.id.nav_label);
                    ImageView tab_icon = (ImageView) tabView.findViewById(R.id.nav_icon);

                    // back to the black color
                    tab_label.setTextColor(getResources().getColor(R.color.dark_grey));
                    // and the icon resouce to the old black image 
                    // also via array that holds the icon resources in order 
                    // and get the one of this tab's position
                    tab_icon.setImageResource(navIcons[tab.getPosition()]);
                }

                @Override
                public void onTabReselected(TabLayout.Tab tab) {
                    super.onTabReselected(tab);
                }
            }
    );

---

that will do the job perfectly , and you can pad yourself in the back as i did myself :D

Answer 2

As setOnTabSelectedListener is deprecated, and there is no new answer, I'll update an updated answer

Should use addOnTabSelectedListener with OnTabSelectedListener

   tabLayout.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener {
            override fun onTabReselected(p0: TabLayout.Tab?) {
            }

            override fun onTabUnselected(p0: TabLayout.Tab?) {
                (p0?.customView?.findViewById(R.id.tab) as TextView).setTextColor(
                    context!!.resources.getColor(
                        R.color.v3_tint_tab_unselected_color
                    )
                )
            }

            override fun onTabSelected(tab: TabLayout.Tab?) {
                (tab?.customView?.findViewById(R.id.tab) as TextView).setTextColor(
                    context!!.resources.getColor(
                        R.color.v3_tint_tab_selected_color
                    )
     (tab?.customView?.findViewById(R.id.tab_img) as ImageView).setImageResource(R.drawable.custom_image)

    //for getting the posiiton if needed you can use
      tab.position or tab.getPosition()
                )
            }
        })

Custom tab xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    android:id="@+id/parent_layout">

<ImageView android:layout_width="@dimen/space_45"
           android:layout_height="@dimen/space_45"
           android:id="@+id/tab_img"
           android:gravity="center"
           android:layout_gravity="center"
           android:src="@drawable/hill_icon_blue"
/>

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:id="@+id/tab"
          android:gravity="center"
          android:layout_gravity="center"
          android:text=""
          android:textColor="@color/white"
          android:textSize="@dimen/text_size_14"
          android:fontFamily="@font/roboto_medium"/>
</LinearLayout>

Answer 3

    ImageView imageView= (ImageView) findViewById(R.id.your_image_view);

    // On tab selected listener
    tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            if (tab.getPosition() == YOUR_TAB_NUMBER)
                imageView.setBackground(getDrawable(R.drawable.ic_second_background));
        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {
            if (tab.getPosition() == YOUR_TAB_NUMBER)
                imageView.setBackground(getDrawable(R.drawable.ic_first_background));
        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {

        }
    });