How to Reduce the Gap Between Tab Layout Text and Its Indicator

How can we reduce the gap between tab layout text and its indicator

Try this

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/htab_maincontent"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">


    <android.support.design.widget.AppBarLayout
        android:id="@+id/htab_appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#2fff00"
        android:fitsSystemWindows="true"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/htab_collapse_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleMarginEnd="64dp"
            app:expandedTitleMarginStart="48dp"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:titleEnabled="false">


            <android.support.v7.widget.Toolbar
                android:id="@+id/htab_toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="@android:color/transparent"
                app:contentInsetStart="0dp"
                app:layout_collapseMode="pin"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />

            <ImageView
                android:id="@+id/htab_header"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@drawable/ic_launcher_background"
                app:layout_collapseMode="parallax" />


        </android.support.design.widget.CollapsingToolbarLayout>

        <android.support.design.widget.TabLayout
            android:id="@+id/htab_tabs"
            android:layout_width="match_parent"
            android:layout_height="35dp"
            android:layout_gravity="bottom"
            android:background="@drawable/tab_selector"
            app:layout_anchor="@+id/MyAppbar"
            app:layout_anchorGravity="bottom"
            app:tabGravity="fill"
            app:tabIndicatorColor="#F21757"
            app:tabMode="scrollable"
            app:tabSelectedTextColor="#F21757"
            app:tabTextColor="@android:color/white" />


    </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</android.support.design.widget.CoordinatorLayout>

drawable/tab_selector

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true" android:state_pressed="false">
        <layer-list xmlns:android="http://schemas.android.com/apk/res/android">

            <item android:top="-2dp" android:left="-5dp" android:right="-5dp" android:bottom="2dp">
                <shape android:shape="rectangle">

                    <solid android:color="@android:color/white"/>
                    <stroke android:color="@color/colorPrimary" android:width="2dp"/>

                </shape>
            </item>
        </layer-list>
    </item>

    <item android:state_selected="true" android:state_pressed="true">
        <layer-list xmlns:android="http://schemas.android.com/apk/res/android">

            <item android:top="-2dp" android:left="-5dp" android:right="-5dp" android:bottom="2dp">
                <shape android:shape="rectangle">

                    <solid android:color="@android:color/white"/>
                    <stroke android:color="@color/colorPrimary" android:width="2dp"/>

                </shape>
            </item>
        </layer-list>
    </item>

</selector>

TabLayout set spacing or margin each tab

Been fighting this problem for a while too, found the solution on this thread : Android Design Support Library TabLayout using custom tabs layout but layout wrapping the tabs

<!-- Add the padding to tabPaddingStart and/or tabPaddingEnd -->
<android.support.design.widget.TabLayout
        android:id="@+id/tabLayout"
        android:layout_width="match_parent"
        android:layout_height="@dimen/tab_layout_height"
        app:tabPaddingStart="10dp"
        app:tabPaddingEnd="10dp">

Reduce the gap between tablayout and view pager

Use RelativeLayout like this -

 <RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

  <android.support.v4.view.ViewPager
    android:layout_width="match_parent"
    android:layout_height="130dp"
    android:layout_marginTop="5dp"
    android:id="@+id/homeOffers"/>

  <android.support.design.widget.TabLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/indicator"
    app:tabGravity="center"
    app:tabIndicatorHeight="0dp"
    app:tabBackground="@drawable/tab_selector"
    android:layout_below="@id/homeOffers/>

 </RelativeLayout>

And remove this line from your cardview -

   app:cardUseCompatPadding="true"

Android Tab layout: Wrap tab indicator width with respect to tab title

Yes, it's possible to wrap tab indicator as title setting padding to 0

 public void wrapTabIndicatorToTitle(TabLayout tabLayout, int externalMargin, int internalMargin) {
        View tabStrip = tabLayout.getChildAt(0);
        if (tabStrip instanceof ViewGroup) {
            ViewGroup tabStripGroup = (ViewGroup) tabStrip;
            int childCount = ((ViewGroup) tabStrip).getChildCount();
            for (int i = 0; i < childCount; i++) {
                View tabView = tabStripGroup.getChildAt(i);
                //set minimum width to 0 for instead for small texts, indicator is not wrapped as expected
                tabView.setMinimumWidth(0);
                // set padding to 0 for wrapping indicator as title
                tabView.setPadding(0, tabView.getPaddingTop(), 0, tabView.getPaddingBottom());
                // setting custom margin between tabs
                if (tabView.getLayoutParams() instanceof ViewGroup.MarginLayoutParams) {
                    ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) tabView.getLayoutParams();
                    if (i == 0) {
                        // left
                        settingMargin(layoutParams, externalMargin, internalMargin);
                    } else if (i == childCount - 1) {
                        // right
                        settingMargin(layoutParams, internalMargin, externalMargin);
                    } else {
                        // internal
                        settingMargin(layoutParams, internalMargin, internalMargin);
                    }
                }
            }

            tabLayout.requestLayout();
        }
}

private void settingMargin(ViewGroup.MarginLayoutParams layoutParams, int start, int end) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        layoutParams.setMarginStart(start);
        layoutParams.setMarginEnd(end);
        layoutParams.leftMargin = start;
        layoutParams.rightMargin = end;
    } else {
        layoutParams.leftMargin = start;
        layoutParams.rightMargin = end;
    }
}

Result

EDIT:
As of com.android.support:design:28.0.0, you can adjust the indicator as label easily now setting:

app:tabIndicatorFullWidth="false"

EDIT July 2019:
Use the material dependency
com.google.android.material:material:x.x.x

Android remove space between tabs in tabwidget

For removing the grey line at the bottom of your tabbar, you can set 

tabHost.getTabWidget().setStripEnabled(false);

As of removing the gap between the tabs.. The best way would be to use your own drawable without any paddings. You can use images for this, or you can create your tabs' backgrounds via xml's, say inside a <layer_list> root element:

<layer_list>
    <item android:top="0dp" android:left="0dp" android:right="0dp" android:bottom="0dp">
        <shape android:shape="rectangle">
        [..]
        </shape>
    </item>
    [..]
</layer_list>

and set this drawable to be the background of your TabWidget.

To see how to customize your tabs, there are a lot of tutorials on the web. For example this one by Josh is short and has a nice explanation.

Update

Here I share a small sample of tabwidget using custom tabs (based on your code) to achieve the following output:

custom tabs

What you need:

  1. three new layer drawables (for
    selected, focused and unselected
    states of the tabs)
  2. two state drawables (for the text
    and background of the different
    states)
  3. a new layout for the tabs
  4. update your main.xml
  5. update your activity class
  6. update your androidManifest.xml
    (remove the style declarations)

The three layer drawables: tab_normal.xml, tab_focused.xml, tab_selected.xml

drawable/tab_normal.xml:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@color/default_back_color" />
        </shape>
    </item>
    <item android:top="2dp">
        <shape android:shape="rectangle">
            <gradient android:startColor="#AAAAAA" android:centerColor="#888888"
                android:endColor="#666666" android:angle="90" />
            <corners android:bottomRightRadius="0dp"
                android:bottomLeftRadius="0dp" android:topLeftRadius="10dp"
                android:topRightRadius="10dp" />
        </shape>
    </item>
    <item android:top="4dp" android:left="1dp" android:right="1dp"
        android:bottom="0dp">
        <shape android:shape="rectangle">
            <solid android:color="@color/default_back_color" />
            <corners android:bottomRightRadius="0dp"
                android:bottomLeftRadius="0dp" android:topLeftRadius="8dp"
                android:topRightRadius="8dp" />
        </shape>
    </item>
</layer-list>

drawable/tab_focused.xml:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@color/default_back_color" />
        </shape>
    </item>
    <item android:top="2dp">
        <shape android:shape="rectangle">
            <gradient android:startColor="#AAAAAA" android:centerColor="#888888"
                android:endColor="#666666" android:angle="90" />
            <corners android:bottomRightRadius="0dp"
                android:bottomLeftRadius="0dp" android:topLeftRadius="10dp"
                android:topRightRadius="10dp" />
        </shape>
    </item>
    <item android:top="4dp" android:left="1dp" android:right="1dp"
        android:bottom="0dp">
        <shape android:shape="rectangle">
            <gradient android:startColor="#8F8F8F" android:centerColor="#656565"
                android:endColor="#3F3F3F" android:angle="90" />
            <corners android:bottomRightRadius="0dp"
                android:bottomLeftRadius="0dp" android:topLeftRadius="8dp"
                android:topRightRadius="8dp" />
        </shape>
    </item>
</layer-list>

drawable/tab_selected.xml:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@color/default_back_color" />
        </shape>
    </item>
    <item android:top="2dp">
        <shape android:shape="rectangle">
            <gradient android:startColor="#EEEEEE" android:centerColor="#CCCCCC"
                android:endColor="#AAAAAA" android:angle="-90" />
            <corners android:bottomRightRadius="0dp"
                android:bottomLeftRadius="0dp" android:topLeftRadius="10dp"
                android:topRightRadius="10dp" />
        </shape>
    </item>
    <item android:top="4dp" android:left="1dp" android:right="1dp"
        android:bottom="0dp">
        <shape android:shape="rectangle">
            <gradient android:startColor="#EAEAEA" android:centerColor="#9F9F9F"
                android:endColor="#696969" android:angle="90" />
            <corners android:bottomRightRadius="0dp"
                android:bottomLeftRadius="0dp" android:topLeftRadius="8dp"
                android:topRightRadius="8dp" />
        </shape>
    </item>
</layer-list>

The two state drawables: tab_background_selector.xml, tab_text_selector.xml

drawable/tab_background_selector.xml:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true" android:state_focused="false"
        android:state_pressed="false" android:drawable="@drawable/tab_selected"/>
    <item android:state_selected="false" android:state_focused="false"
        android:state_pressed="false" android:drawable="@drawable/tab_normal" />
    <item android:state_pressed="true" android:drawable="@drawable/tab_focused"/>
    <item android:state_focused="true" android:state_selected="true"
        android:state_pressed="false" android:drawable="@drawable/tab_selected"/>
</selector>

drawable/tab_text_selector.xml:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true" android:color="#1589FF" />
    <item android:state_focused="true" android:color="#1589FF" />
    <item android:state_pressed="true" android:color="@android:color/white" />
    <item android:color="#F0F0F0" />
</selector>

The new layout for the tabs: tab.xml

layout/tab.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="fill_parent"
    android:background="@drawable/tab_background_selector" android:gravity="center"
    android:orientation="vertical" android:padding="5dp">
    <ImageView android:id="@+id/tab_icon" android:layout_width="30dp"
        android:layout_height="30dp" android:scaleType="fitCenter" />
    <TextView android:id="@+id/tab_text" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:singleLine="true"
        android:textStyle="bold" android:gravity="center_horizontal"
        android:textSize="10sp" android:padding="3dip" android:ellipsize="marquee"
        android:textColor="@drawable/tab_text_selector" />
</LinearLayout>

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TabHost android:id="@android:id/tabhost" android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <LinearLayout android:orientation="vertical"
            android:layout_width="fill_parent" android:layout_height="fill_parent">
            <HorizontalScrollView android:scrollbars="none"
                android:layout_width="fill_parent" android:layout_height="wrap_content">
                <TabWidget android:id="@android:id/tabs" 
                    android:layout_width="fill_parent" android:layout_height="wrap_content" />
            </HorizontalScrollView>
            <FrameLayout android:id="@android:id/tabcontent"
                android:layout_width="fill_parent" android:layout_height="fill_parent"
                android:padding="5dp" />
        </LinearLayout>
    </TabHost>
</LinearLayout>

InfralineTabWidget.java:

public class InfralineTabWidget extends TabActivity
{
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final TabHost tabHost = (TabHost) getTabHost();

        tabHost.addTab(createTab(TopNewsActivity.class, 
                "topNews", "Top News", R.drawable.tab_news));
        tabHost.addTab(createTab(PowerActivity.class, 
                "power", "Power", R.drawable.tab_power));
        tabHost.addTab(createTab(EnergyActivity.class, 
                "energy", "Renewable Energy", R.drawable.tab_energy));
        tabHost.addTab(createTab(CoalActivity.class, 
                "coal", "Coal", R.drawable.tab_coal));
        tabHost.addTab(createTab(OilnGasActivity.class, 
                "oilnGas", "Oil & Gas", R.drawable.tab_oilngas));

        tabHost.setCurrentTab(0);
        tabHost.getTabWidget().getChildAt(0).getLayoutParams().width = 140;
        tabHost.getTabWidget().getChildAt(1).getLayoutParams().width = 140;
        tabHost.getTabWidget().getChildAt(2).getLayoutParams().width = 140;
        tabHost.getTabWidget().getChildAt(3).getLayoutParams().width = 140;
        tabHost.getTabWidget().getChildAt(4).getLayoutParams().width = 140;
    }

    private TabSpec createTab(final Class<?> intentClass, final String tag, 
            final String title, final int drawable)
    {
        final Intent intent = new Intent().setClass(this, intentClass);

        final View tab = LayoutInflater.from(getTabHost().getContext()).
            inflate(R.layout.tab, null);
        ((TextView)tab.findViewById(R.id.tab_text)).setText(title);
        ((ImageView)tab.findViewById(R.id.tab_icon)).setImageResource(drawable);

        return getTabHost().newTabSpec(tag).setIndicator(tab).setContent(intent);
    }
}

And this is it.

To create straight cornered tabs, just lose the corner specifications from the layer drawable xml files.

Also play around the colors, strokes, etc., to make the outcome fit your preferences.

How to remove extra space between tabs in flutter?

Had the same issue.
Make sure you set padding to zero for tabs, label and indicator.

TabBar(
   indicatorSize: TabBarIndicatorSize.label,
   isScrollable: true,
   tabs: categoriesWidgets,
   padding: EdgeInsets.zero,
   indicatorPadding: EdgeInsets.zero,
   labelPadding: EdgeInsets.zero,
   indicatorWeight: 4,
 )

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