Do you want to create a tab button with rotatable image view? I wanted to create a button for Playgong's "Explore" tab with spinning compass icon, so I created `RotatableTabButtonImageView` which not only fades in/out icon, but also rotates it as pages are scrolled. Look to `setVividness` method. This method is called from `TabsToolbar` method `…

RotatableTabButtonImageView.java

package com.playgong.view;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;

/**
 * @author Vilius Kraujutis
 * @since 2015-04-29 01:50.
 */
public class RotatableTabButtonImageView extends TabButtonImageView {

    public static final int FULL_CIRCLE_DEGREES = 360;

    public RotatableTabButtonImageView(Context context) {
        super(context);
    }

    public RotatableTabButtonImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public RotatableTabButtonImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public RotatableTabButtonImageView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    public void setVividness(float vividness) {
        super.setVividness(vividness);
        setRotation(FULL_CIRCLE_DEGREES * vividness);
    }
}

TabButtonImageView.java

package com.playgong.view;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * @author Vilius Kraujutis
 * @since 2015-04-29 01:50.
 */
public class TabButtonImageView extends ImageView implements Vividnessable {
    public TabButtonImageView(Context context) {
        super(context);
    }

    public TabButtonImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public TabButtonImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public TabButtonImageView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    public void setVividness(float vividness) {
        setAlpha(Vividnessable.TAB_INACTIVE_ALPHA + vividness * (TAB_ACTIVE_ALPHA - TAB_INACTIVE_ALPHA));
    }
}

TabsToolbar.java

package com.playgong.view;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.View;
import android.widget.RelativeLayout;

import com.playgong.R;
import com.playgong.fragment.TabNavigationFragment;

import butterknife.ButterKnife;
import butterknife.InjectView;
import butterknife.OnClick;

/**
 * @author Vilius Kraujutis
 * @since 2015-01-14 12:50
 */
public class TabsToolbar extends RelativeLayout implements ViewPager.OnPageChangeListener {

    @InjectView(R.id.tabnav_tabs_explore_tab)
    TabButtonImageView discover;
    @InjectView(R.id.tabnav_tabs_playgong_tab)
    TabButtonImageView playgong;
    @InjectView(R.id.tabnav_tabs_profile_tab)
    TabButtonImageView profile;
    @InjectView(R.id.tabnav_tabs_indicator)
    TabsIndicatorView indicator;

    private ViewPager pager;

    public TabsToolbar(Context context) {
        super(context);
    }

    public TabsToolbar(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public TabsToolbar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public TabsToolbar(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        ButterKnife.inject(this);
    }

    @OnClick(R.id.tabnav_tabs_explore_tab)
    public void onDiscoverTabClicked(View tabButton) {
        pager.setCurrentItem(TabNavigationFragment.TAB_EXPLORE);
    }

    @OnClick(R.id.tabnav_tabs_playgong_tab)
    public void onPlaygongTabClicked(View tabButton) {
        pager.setCurrentItem(TabNavigationFragment.TAB_PLAYGONG);
    }

    @OnClick(R.id.tabnav_tabs_profile_tab)
    public void onProfileTabClicked(View tabButton) {
        pager.setCurrentItem(TabNavigationFragment.TAB_DASHBOARD);
    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        TabButtonImageView leftTab = getTabButton(position);
        TabButtonImageView rightTab = getTabButton(position + 1);
        indicator.onPageSwiped(leftTab, 1 - positionOffset, rightTab, positionOffset);

        rightTab.setVividness(positionOffset);
        leftTab.setVividness(1 - positionOffset);
    }

    @Override
    public void onPageSelected(@TabNavigationFragment.TAB int position) {
        discover.setAlpha(position == TabNavigationFragment.TAB_EXPLORE ? Vividnessable.TAB_ACTIVE_ALPHA : Vividnessable.TAB_INACTIVE_ALPHA);
        playgong.setAlpha(position == TabNavigationFragment.TAB_PLAYGONG ? Vividnessable.TAB_ACTIVE_ALPHA : Vividnessable.TAB_INACTIVE_ALPHA);
        profile.setAlpha(position == TabNavigationFragment.TAB_DASHBOARD ? Vividnessable.TAB_ACTIVE_ALPHA : Vividnessable.TAB_INACTIVE_ALPHA);
    }

    @Override
    public void onPageScrollStateChanged(int state) {

    }

    private TabButtonImageView getTabButton(int pageIndex) {
        switch (pageIndex) {
            case TabNavigationFragment.TAB_EXPLORE:
                return discover;
            case TabNavigationFragment.TAB_PLAYGONG:
                return playgong;
            default:
            case TabNavigationFragment.TAB_DASHBOARD:
                return profile;
        }
    }

    public void setPager(ViewPager pager) {
        this.pager = pager;
    }
}

Vividnessable.java

package com.playgong.view;

/**
 * @author Vilius Kraujutis
 * @since 2015-04-29 01:53.
 */
public interface Vividnessable {
    float TAB_ACTIVE_ALPHA = 1f;
    float TAB_INACTIVE_ALPHA = 0.3f;

    void setVividness(float vividness);
}