Custom TextSize of BottomNavigationView support android

AndroidAndroid Support-LibraryAndroiddesignsupport

Android Problem Overview

I am trying to change the textSize of BottomNavigationView from android support library 25.0.0

<android.support.design.widget.BottomNavigationView
        android:id="@+id/bottom_navigation_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:background="@color/colorPrimaryDark"
        android:foregroundTint="@color/colorAccent"
        app:itemIconTint="@android:color/white"
        app:itemTextColor="@android:color/white"
        app:layout_anchor="@id/lyt_container"
        app:layout_anchorGravity="bottom"
        app:itemTextAppearance="@style/TextStyleBNV"
        app:menu="@menu/nav_menu" />

<style name="TextStyleBNV">
        <item name="android:textSize">@dimen/twelve_sp</item>
        <item name="android:padding">0dp</item>
        <item name="textAllCaps">false</item>
    </style>

Is there anything i am missing.

Android Solutions

Solution 1 - Android

Unfortunately this first version of BottomNavigationView came with a lot of limitations. And for now you can't change titles size just using the support design API. So to solve this limitation while google doesn't implement it, you can do:

In your dimen.xml you can put:

    <dimen name="design_bottom_navigation_text_size" tools:override="true">30sp</dimen>
    <dimen name="design_bottom_navigation_active_text_size" tools:override="true">30sp</dimen>

Doing this you are overriding the default value of dimen that the internal classes of BottomNavigationView use. So be carreful.

Solution 2 - Android

You can change BottomNavigationView text appearance by defining your own styles for Component Attributes itemTextAppearanceActive and itemTextAppearanceInactive . By default they have textAppearanceCaption check section Theme Attribute Mapping in the docs Bottom Navigation.

<android.support.design.widget.BottomNavigationView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:itemTextAppearanceActive="@style/BottomNavigationView.Active"
    app:itemTextAppearanceInactive="@style/BottomNavigationView"
    app:menu="@menu/bottom_navigation_main" />

styles.xml

<style name="BottomNavigationView" parent="@style/TextAppearance.AppCompat.Caption">
    <item name="android:textSize">10sp</item>
</style>

<style name="BottomNavigationView.Active" parent="@style/TextAppearance.AppCompat.Caption">
    <item name="android:textSize">11sp</item>
</style>

  • Next, Change Text Color selected and icon:
    Just Create bottom_nav_icon_color_selector & bottom_nav_text_color_selector on drawable to edit default value.

  • For change icon color - bottom_nav_icon_color_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@color/colorPrimary" android:state_checked="true" /> <!-- colorIcon Active -->
    <item android:color="@color/colorPrimary" android:state_enabled="true" android:state_pressed="true" /> <!-- colorIcon Active -->
    <item android:color="@color/colorIconInActive" /> <!-- colorIcon InActive -->
</selector>
  • For change text color - bottom_nav_text_color_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@color/colorPrimary" android:state_checked="true" /> <!-- colorText Active -->
    <item android:color="@color/colorPrimary" android:state_enabled="true" android:state_pressed="true" /> <!-- colorText Active -->
    <item android:color="@color/colorTextInActive" /> <!-- colorText InActive -->
</selector>

  • Note : @color/colorIconInActive is a color disable/inactive, you can set this color in your res-values-colors

  • Finish, try to see, your navigation bottom. color icon and text will be change. 

Solution 3 - Android

you can change it like this. you have to only khow the id of labels that google support used

BottomNavigationView bottomNavigationView = (BottomNavigationView) fragmentActivity.findViewById(R.id.bottom_navigation);
	TextView textView = (TextView) bottomNavigationView.findViewById(R.id.menu_item_home).findViewById(R.id.largeLabel);
	textView.setTextSize(8);

LargeLabel is the id of label that google used in its library

Solution 4 - Android

I used the snippet below to change the NavigationView style using the Material design.

<style name="MyBottomNavigationView" parent="Widget.MaterialComponents.BottomNavigationView">
    <item name="itemIconTint">@color/bottom_navigation_item_selector</item>
    <item name="itemTextColor">@color/bottom_navigation_item_selector</item>
    <item name="itemTextAppearanceActive">@style/MyBottomNavigationView.TextAppearance</item>
    <item name="itemTextAppearanceInactive">@style/MyBottomNavigationView.TextAppearance</item>
</style>

<style name="MyBottomNavigationView.TextAppearance" parent="TextAppearance.MaterialComponents.Caption">
    <item name="android:textSize">11sp</item>
    <item name="fontFamily">@font/exo2_medium</item>
</style>

Then set the style to the BottomNavigationView element

<com.google.android.material.bottomnavigation.BottomNavigationView
    ...
    style="@style/MyBottomNavigationView" />

Solution 5 - Android

Another solution is to use Spannable to adjust the size color, font or other a text attributes ....

private static class MenuSpannable extends MetricAffectingSpan{
        int color = Color.RED;
        int size = 40;

        public MenuSpannable() {
            setSelected(false);
        }

        @Override
        public void updateMeasureState(TextPaint p) {
            p.setColor(color);
            p.setTextSize(size);
            /* p.setText --- whatever --- */
        }

        @Override
        public void updateDrawState(TextPaint tp) {
            tp.setColor(color);
            tp.setTextSize(size);
            /* tp.setText --- whatever --- */
        }
        private void setSelected(boolean selected){
            if(selected){
                color = Color.RED;
                size = 40;
            }else{
                color = Color.BLUE;
                size = 20;
            }
        }
}

And then set the span for any menu item...

@Override
protected void onCreate(Bundle savedInstanceState) {
		BottomNavigationView mBottomNavigationView = (BottomNavigationView)findViewById(R.id.bottom_menu);
		final Menu menu = mBottomNavigationView.getMenu();
		final Font font = Font.getFromContext(this);
		for(int i = 0; i < menu.size(); i++) {
			SpannableString spannableString = new SpannableString(menu.getItem(i).getTitle());
			spannableString.setSpan(new MenuSpannable(),0,spannableString.length(),0);
			menu.getItem(i).setTitle(spannableString);
		}
}

In case you want the text to change with the selection state

mBottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
			 Menu menu = mBottomNavigationView.getMenu();
   			 for(int i = 0; i < menu.size(); i++) {
				MenuSpannable menuSpannable = new MenuSpannable();
				menuSpannable.setSelected(item.getItemId() == menu.getItem(i).getItemId());
				SpannableString sString = new SpannableString(menu.getItem(i).getTitle());
				sString.setSpan(menuSpannable,0,sString.length(),0);
				menu.getItem(i).setTitle(sString);
				}
            return false;
            }
        });

Solution 6 - Android

To do this, I just decided to override the navigation item layout :

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
    <ImageView
        android:id="@+id/icon"
        android:layout_width="24dp"
        android:layout_height="24dp"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="@dimen/design_bottom_navigation_margin"
        android:layout_marginBottom="@dimen/design_bottom_navigation_margin"
        android:duplicateParentState="true" />
    <android.support.design.internal.BaselineLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|center_horizontal"
        android:clipToPadding="false"
        android:paddingBottom="10dp"
        android:duplicateParentState="true">
        <TextView
            android:id="@+id/smallLabel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="@dimen/design_bottom_navigation_text_size"
            android:singleLine="true"
            android:duplicateParentState="true" />
        <TextView
            android:id="@+id/largeLabel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:visibility="invisible"
            android:textSize="@dimen/design_bottom_navigation_active_text_size"
            android:singleLine="true"
            android:duplicateParentState="true" />
    </android.support.design.internal.BaselineLayout>
</merge>

Just make sure you name it design_bottom_navigation_item

Solution 7 - Android

Add the TabTextStyle code inside the UpdateBarTextColor (this void exist in BottomBarPageRenderer)

 void UpdateBarTextColor()
    {
        if (_disposed || _bottomBar == null)
        {
            return;
        }
        //This is linked to styles.xml to set size of text
        _bottomBar.SetTextAppearance(Resource.Style.TabTextStyle);
        //Set color of text and icon in BottomNavBar
        _bottomBar.SetActiveTabColor(Element.BarTextColor.ToAndroid(Color.FromHex("#0094F0")));
        // The problem SetActiveTabColor does only work in fiexed mode // haven't found yet how to set text color for tab items on_bottomBar, doesn't seem to have a direct way
    }

And then add this inside the styles.xml:

<style name="TabTextStyle" parent="@android:style/TextAppearance.Medium"> 
    <item name="android:textSize">8dp</item> 
</style>

Solution 8 - Android

Unfortunately overriding dimen did not work for me at com.android.support:design:28.0.0

Finally I was able to change the text size by using <font size="8"></font> tag for each title string resource used in menu.xml.

For example I have a menu declared here menu_bottom_navigation.xml, which has item like:

<item
  ...
  android:title="@string/main_navi_item_home"
  .../>

In string.xml, set the target resource like:

<string name="main_navi_item_home"><font size="8">Home</font></string>
Categories
Recommended Android Solutions
Recommended Android Support-Library Solutions
Recommended Androiddesignsupport Solutions

Previous Solution:

How to specify if a field is optional or required in OpenAPI/Swagger?

SwaggerOpenapi

Next Solution:

pandas concat generates nan values

PythonPandasDataframeConcatenationNan

Attributions

All content for this solution is sourced from the original question on Stackoverflow.

The content on this page is licensed under the Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionsilentsudoView Question on Stackoverflow
Solution 1 - AndroidSanf0rdView Answer on Stackoverflow
Solution 2 - AndroidVolodymyrView Answer on Stackoverflow
Solution 3 - AndroidBoshRaView Answer on Stackoverflow
Solution 4 - AndroidPedro RomãoView Answer on Stackoverflow
Solution 5 - AndroidYanView Answer on Stackoverflow
Solution 6 - AndroidPafoidView Answer on Stackoverflow
Solution 7 - AndroidpetteranderssonView Answer on Stackoverflow
Solution 8 - AndroidKinoPView Answer on Stackoverflow