position value of tab selected while switching one tab to another is not changing in android tabLayout

Question

while switching tabs in tablayout position value tab is not changing.see the code below.

tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            tab.getIcon().setColorFilter(Color.parseColor("#ffffff"), PorterDuff.Mode.SRC_IN);
        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {
            tab.getIcon().setColorFilter(Color.parseColor("#40FFFFFF"), PorterDuff.Mode.SRC_IN);
        }

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

        }
    });

onTabSelected() method i took its position value as reference but while switching tabs it's position value was not changing. so i tried assign below code to take reference this also not worked with me.

viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override
        public void onPageSelected(int position) {
            tabposition=position;
        }

        @Override
        public void onPageScrollStateChanged(int state) {

            // Hide the keyboard.
            ((InputMethodManager)getSystemService(INPUT_METHOD_SERVICE))
                    .hideSoftInputFromWindow(viewPager.getWindowToken(), 0);


        }
    });

i want to use position value here

 public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.

    getMenuInflater().inflate(R.menu.main, menu);
    menu.clear();
    Log.d("position", "--------- "+tabposition);
    if (tabposition == 0) {
        getMenuInflater().inflate(R.menu.main, menu);  //  menu for alert.
    } else if (tabposition ==1){
        getMenuInflater().inflate(R.menu.transactionmenu, menu);  // menu for transactiontab
    }else {
        getMenuInflater().inflate(R.menu.notificationsmenu, menu);  // menu for notificationtab
    }
    return super.onPrepareOptionsMenu(menu);
    //return true;
}

Then you can use `fragments and FragmentPagerAdapter`. You dont need to use `addOnPageChangeListener and setOnTabSelectedListener` — Jyoti JK, Mar 07 '18 at 09:41

score 0 · Answer 1 · answered Mar 07 '18 at 09:53

If you want to use different menu for different page , You can use the following code in each fragment

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    menu.clear();
    inflater.inflate(R.menu.menu, menu);//menu for that fragment
    super.onCreateOptionsMenu(menu, inflater);
}

And also in each fragment , add setHasOptionsMenu(true);

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
    }

And use Fragment pager adapter like

public class MyAdapter extends FragmentPagerAdapter {
    static int NUM_ITEMS = 3;
    final String[] a={"one" ,"two" ,"three"};
    public MyAdapter(FragmentManager fragmentManager) {
        super(fragmentManager);

    }
    @Override
    public int getCount() {
        return NUM_ITEMS;
    }
    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                return new Fragmentone();
            case 1:
                return new Fragmenttwo();
            case 2:
                return new Fragmentthree();
            default:
                return null;
        }
    }
    @Override
    public CharSequence getPageTitle(int position) {
        return a[position];
    }
}

And in your activity , use this

mViewPager = (ViewPager) findViewById(R.id.container);
        final TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
        mSectionsPagerAdapter = new MyAdapter(getSupportFragmentManager());
        mViewPager.setAdapter(mSectionsPagerAdapter);
        tabLayout.setupWithViewPager(mViewPager);

Change tab text color using tabTextColor and tabSelectedTextColor,

<android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            app:tabIndicatorColor="#fff"
            app:tabTextColor="#80ffffff"
            app:tabSelectedTextColor="#fff"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

position value of tab selected while switching one tab to another is not changing in android tabLayout

1 Answers1