使用TabLayout遇到的几个坑

            final PagerAdapter adapter = viewPager.getAdapter();
            if (adapter != null) {
                // Now we'll populate ourselves from the pager adapter, adding an observer if
                // autoRefresh is enabled
                setPagerAdapter(adapter, autoRefresh);
            }

    void populateFromPagerAdapter() {
        removeAllTabs();
        ......
    }

tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                int i = tabLayout.getSelectedTabPosition();
                Log.e("onTabSelected", i + "");
                tab.setIcon(licons_p[i]);
                mViewPager.setCurrentItem(i);
                //tabLayout.setTabTextColors(Color.BLACK, Color.RED);
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
                int i = tabLayout.getSelectedTabPosition();
                Log.e("onTabUnselected", i + "");
                tab.setIcon(licons[i]);
                //tabLayout.setTabTextColors(Color.BLACK, Color.BLACK);
            }

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

            }
        });

public class MainActivity extends AppCompatActivity {

    private TabLayout tabLayout;
    private ViewPager mViewPager;
    private List<String> mTitleList = new ArrayList<>();//页卡标题集合
    private List<Fragment> mFragmentList = new ArrayList<>();
    //未选中状态的icon数组
    int licons[] = {R.drawable.custom, R.drawable.stock, R.drawable.order};
    //选中状态下的icon数组
    int licons_p[] = {R.drawable.custom_p, R.drawable.stock_p, R.drawable.order_p};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTitleList.add("商户");
        mTitleList.add("名字");
        mTitleList.add("出售");

        mFragmentList.add(new AFragment());
        mFragmentList.add(new BFragment());
        mFragmentList.add(new CFragment());

        mViewPager = (ViewPager) findViewById(R.id.viewpager);
        tabLayout = (TabLayout) findViewById(R.id.tabLayout);

        MyAdpter mAdapter = new MyAdpter(getSupportFragmentManager(), mFragmentList);
        mViewPager.setAdapter(mAdapter);
        mViewPager.setOffscreenPageLimit(3);
        mViewPager.setCurrentItem(0);

        forIconAndText();
    }

    /**
     * 文字图片都有的情况
     */
    private void forIconAndText() {
        tabLayout.setupWithViewPager(mViewPager);//将TabLayout和ViewPager关联起来。

        //setupWithViewPager里面有removeAllTabs，所以关联以后在添加
        tabLayout.removeAllTabs();
        for (int i = 0; i < mTitleList.size(); i++) {
            tabLayout.addTab(tabLayout.newTab().setIcon(licons[i]).setText(mTitleList.get(i)));
        }

        tabLayout.getTabAt(0).setIcon(licons_p[0]);
        tabLayout.setTabTextColors(Color.BLACK, Color.RED);

        tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                int i = tabLayout.getSelectedTabPosition();
                Log.e("onTabSelected", i + "");
                tab.setIcon(licons_p[i]);
                mViewPager.setCurrentItem(i);
                tabLayout.setTabTextColors(Color.BLACK, Color.RED);
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
                int i = tabLayout.getSelectedTabPosition();
                Log.e("onTabUnselected", i + "");
                tab.setIcon(licons[i]);
                tabLayout.setTabTextColors(Color.BLACK, Color.BLACK);
            }

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

            }
        });
    }

    /**
     * 只有文字的情况
     */
    private void onlyForText() {
        tabLayout.removeAllTabs();
        for (int i = 0; i < mTitleList.size(); i++) {
            tabLayout.addTab(tabLayout.newTab().setIcon(licons[i]).setText(mTitleList.get(i)), i == 0 ? true : false);
        }
        tabLayout.setTabTextColors(Color.BLACK, Color.RED);
        mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
    }
}