选项卡在平板设备上不占全宽 [使用 android.support.design.widget.TabLayout]

Question

I have setup tabs as UPDATE 29/05/2015 this post. Tabs take full width on my Nexus 4 mobile but on nexus 7 tablet it in center and not cover full screen width.

Nexus 7 screenshotNexus 4 screenshot

Answer 1

A "simpler" answer borrowed from Kaizie would just be adding app:tabMaxWidth="0dp" in your TabLayout xml:

<android.support.design.widget.TabLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabMaxWidth="0dp"
            app:tabGravity="fill"
            app:tabMode="fixed" />

Answer 2

I had the same problem and I checked the TabLayout style, and i found that its default style is Widget.Design.TabLayout which has different implementations (normal, landscape and sw600dp).

The one we need is the one for tablets (sw600dp) which has the following implementation:

<style name="Widget.Design.TabLayout" parent="Base.Widget.Design.TabLayout">
        <item name="tabGravity">center</item>
        <item name="tabMode">fixed</item>
 </style>

From this style we will use " tabGravity " (which possible values are "center" or "fill") using the "fill" value.

But we need to go deeper, and then we see that this one extends from Base.Widget.Design.TabLayout , which implementation is:

<style name="Base.Widget.Design.TabLayout" parent="android:Widget">
    <item name="tabMaxWidth">@dimen/tab_max_width</item>
    <item name="tabIndicatorColor">?attr/colorAccent</item>
    <item name="tabIndicatorHeight">2dp</item>
    <item name="tabPaddingStart">12dp</item>
    <item name="tabPaddingEnd">12dp</item>
    <item name="tabBackground">?attr/selectableItemBackground</item>
    <item name="tabTextAppearance">@style/TextAppearance.Design.Tab</item>
    <item name="tabSelectedTextColor">?android:textColorPrimary</item>
</style>

So, from this style we will need to override " tabMaxWidth ". In my case I set it to 0dp , so it has no limit.

And my style looked like this:

<style name="MyTabLayout" parent="Widget.Design.TabLayout">
        <item name="tabGravity">fill</item>
        <item name="tabMaxWidth">0dp</item>
</style>

And then the tab bar will fill the whole screen from side to side.

Answer 3

Solution for scrollable: (TabLayout.MODE_SCROLLABLE), that is when ever you need more than 2 tabs (Dynamic tabs)

Step 1 : style.xml

<style name="tabCustomStyle" parent="Widget.Design.TabLayout">
            <item name="tabGravity">fill</item>
            <item name="tabMaxWidth">0dp</item>
            <item name="tabIndicatorColor">#FFFEEFC4</item>
            <item name="tabIndicatorHeight">2dp</item>
            <item name="tabTextAppearance">@style/MyCustomTabTextAppearance</item>
            <item name="tabSelectedTextColor">#FFFEEFC4</item>
        </style>

        <style name="MyCustomTabTextAppearance" parent="TextAppearance.Design.Tab">
            <item name="android:textSize">@dimen/tab_text_size</item>
            <item name="android:textAppearance">@style/TextAppearance.roboto_medium</item>
            <item name="textAllCaps">true</item>
        </style>
        <style name="TextAppearance.roboto_medium" parent="android:TextAppearance">
            <item name="android:fontFamily">sans-serif-medium</item>
        </style>

Step 2 : Your xml layout

<android.support.design.widget.TabLayout
            android:id="@+id/sliding_tabs"
            style="@style/tabCustomStyle"
            android:layout_width="match_parent"
            android:layout_height="@dimen/tab_strip_height"
            android:background="@color/your_color"
            app:tabMode="scrollable"
            app:tabTextColor="@color/your_color" />

Step 3: In your Activity/Fragment where ever you have tabs.

/**
     * To allow equal width for each tab, while (TabLayout.MODE_SCROLLABLE)
     */
    private void allotEachTabWithEqualWidth() {

        ViewGroup slidingTabStrip = (ViewGroup) mTabLayout.getChildAt(0);
        for (int i = 0; i < mTabLayout.getTabCount(); i++) {
            View tab = slidingTabStrip.getChildAt(i);
            LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) tab.getLayoutParams();
            layoutParams.weight = 1;
            tab.setLayoutParams(layoutParams);
        }

    }

Answer 4

To force tabs to take up the full width (split into equal sizes), apply the following to the TabLayout view:

TabLayout tabLayout = (TabLayout) findViewById(R.id.your_tab_layout);
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
tabLayout.setTabMode(TabLayout.MODE_FIXED);

Answer 5

This is helpful you must try

 <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMaxWidth="0dp"
        app:tabGravity="fill"
        app:tabMode="fixed"
        app:tabIndicatorColor="@color/white"
        app:tabSelectedTextColor="@color/white"
        app:tabTextColor="@color/orange" />

Answer 6

<android.support.design.widget.TabLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabMaxWidth="0dp"
            app:tabGravity="fill"
            app:tabMode="fixed" />

work for me. This also have xmlns:app="http://schemas.android.com/apk/res-auto"

Answer 7

Just did this and worked like a charm

<com.google.android.material.tabs.TabLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:tabGravity="fill"
    app:tabMaxWidth="0dp"/>

Answer 8

For me the following code worked and was enough.

<android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabGravity="fill"/>

Answer 9

Solution for Scrollable (Kotlin)

In xml:

     <com.google.android.material.tabs.TabLayout
            android:id="@+id/home_tab_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabMaxWidth="0dp"
            app:tabMode="scrollable"
            android:fillViewport="true"
            app:tabGravity="fill" />

In Kotlin:

In my case if less than 3 tabs I allocate equal space.

Note: If condition is as per your requirement

        if(list.size <= 3){
          allotEachTabWithEqualWidth(your_tab_layout)
        }

     fun allotEachTabWithEqualWidth(tabLayout: TabLayout) {
        tabLayout.tabMode=  TabLayout.MODE_SCROLLABLE
        val slidingTabStrip = tabLayout.getChildAt(0) as ViewGroup
        for (i in 0 until tabLayout.getTabCount()) {
            val tab = slidingTabStrip.getChildAt(i)
            val layoutParams = tab.layoutParams as LinearLayout.LayoutParams
            layoutParams.weight = 1f
            tab.layoutParams = layoutParams
        }

    }

Answer 10

Check below code for solutions.

Below is layout code:

<com.yourpackage.CustomTabLayout
    android:id="@+id/tabs"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="@color/off_white"
    app:tabIndicatorColor="@color/primaryColor"
    app:tabIndicatorHeight="3dp"
    app:tabMode="scrollable"
    app:tabPaddingEnd="0dp"
    app:tabPaddingStart="0dp" />

Note, for dynamic tab count, don't forget to call setTabNumbers(tabcount).

import android.content.Context;
import android.support.design.widget.TabLayout;
import android.util.AttributeSet;
import android.util.
import java.lang.reflect.Field;

public class CustomTabLayout extends TabLayout
{
    private static final int WIDTH_INDEX = 0;
    private int DIVIDER_FACTOR = 3;
    private static final String SCROLLABLE_TAB_MIN_WIDTH = "mScrollableTabMinWidth";

    public CustomTabLayout(Context context) {
        super(context);
        initTabMinWidth();
    }

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

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

    public void setTabNumbers(int num)
    {
        this.DIVIDER_FACTOR = num;
        initTabMinWidth();
    }

    private void initTabMinWidth()
    {
        int[] wh = getScreenSize(getContext());
        int tabMinWidth = wh[WIDTH_INDEX] / DIVIDER_FACTOR;

        Log.v("CUSTOM TAB LAYOUT", "SCREEN WIDTH = " + wh[WIDTH_INDEX] + " && tabTotalWidth = " + (tabMinWidth*DIVIDER_FACTOR) + " && TotalTabs = " + DIVIDER_FACTOR);

        Field field;
        try {
            field = TabLayout.class.getDeclaredField(SCROLLABLE_TAB_MIN_WIDTH);
            field.setAccessible(true);
            field.set(this, tabMinWidth);
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static final int WIDTH_INDEX = 0;
    private static final int HEIGHT_INDEX = 1;

    public static int[] getScreenSize(Context context) {
        int[] widthHeight = new int[2];
        widthHeight[WIDTH_INDEX] = 0;
        widthHeight[HEIGHT_INDEX] = 0;

        try {
            WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
            Display display = windowManager.getDefaultDisplay();

            Point size = new Point();
            display.getSize(size);
            widthHeight[WIDTH_INDEX] = size.x;
            widthHeight[HEIGHT_INDEX] = size.y;

            if (!isScreenSizeRetrieved(widthHeight))
            {
                DisplayMetrics metrics = new DisplayMetrics();
                display.getMetrics(metrics);
                widthHeight[0] = metrics.widthPixels;
                widthHeight[1] = metrics.heightPixels;
            }

            // Last defense. Use deprecated API that was introduced in lower than API 13
            if (!isScreenSizeRetrieved(widthHeight)) {
                widthHeight[0] = display.getWidth(); // deprecated
                widthHeight[1] = display.getHeight(); // deprecated
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return widthHeight;
    }

    private static boolean isScreenSizeRetrieved(int[] widthHeight) {
        return widthHeight[WIDTH_INDEX] != 0 && widthHeight[HEIGHT_INDEX] != 0;
    }
}

Reference taken from https://medium.com/@elsenovraditya/set-tab-minimum-width-of-scrollable-tablayout-programmatically-8146d6101efe

Answer 11

Why all that hectic work ? Just put app:tabMode="scrollable" in your TabLayout in XML. Thats it.

Answer 12

In my variant of this problem, I had 3 tabs of moderate size which weren't taking up full width on tablets. I didn't need the tabs to be scrollable on tablets, since tablets are big enough to display the tabs all together without any scrolling. But I did need the tabs to be scrollable on phones, since phones are too small to display all the tabs together.

The best solution in my case was to add a res/layout-sw600dp/main_activity.xml file, where the relevant TabLayout could have app:tabGravity="fill" and app:tabMode="fixed" . But in my regular res/layout/main_activity.xml , I left out app:tabGravity="fill" and app:tabMode="fixed" , and had app:tabMode="scrollable" instead.

Answer 13

Please note that you also need to set

  app:tabPaddingStart="-1dp"
  app:tabPaddingEnd="-1dp"

to fill all space