I followed the recommendations on the Google developer page to create these 5 folders and filled them with icons of the correct size:

I created my tabs using TabHostas follows:
TabHost tabHost = (TabHost) findViewById(R.id.tabHost);
tabHost.setup();
TabHost.TabSpec spec1 = tabHost.newTabSpec("tab1");
spec1.setContent(R.id.tab1);
spec1.setIndicator("", getResources().getDrawable(R.drawable.homeicon));
TabHost.TabSpec spec2 = tabHost.newTabSpec("tab2");
spec2.setContent(R.id.tab2);
spec2.setIndicator("", getResources().getDrawable(R.drawable.startachainwhite48dp));
TabHost.TabSpec spec3 = tabHost.newTabSpec("tab3");
spec3.setContent(R.id.tab3);
spec3.setIndicator("", getResources().getDrawable(R.drawable.joinachainwhite48dp));
TabHost.TabSpec spec4 = tabHost.newTabSpec("tab4");
spec4.setContent(R.id.tab4);
spec4.setIndicator("", getResources().getDrawable(R.drawable.viewchainswhite48dp));
TabHost.TabSpec spec5 = tabHost.newTabSpec("tab5");
spec5.setContent(R.id.tab5);
spec5.setIndicator("", getResources().getDrawable(R.drawable.profilewhite48dp));
tabHost.addTab(spec1);
tabHost.addTab(spec2);
tabHost.addTab(spec3);
tabHost.addTab(spec4);
tabHost.addTab(spec5);
But for some reason, the icons on my tabs (bottom) appear small

Does anyone have an explanation / solution? I feel like I made a stupid mistake somewhere - send an xml layout if necessary. Thank you in advance.
EDIT: It may be worth mentioning that the getDrawable () method that I use in the above code is deprecated (API 22)
EDIT2: Full XML Layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/tool_bar_test"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#FF86B39A"
android:fitsSystemWindows="true"
android:gravity="top"
app:contentInsetLeft="0dp"
app:contentInsetStart="0dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:id="@+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center"
android:text="Test"
android:textColor="#ffffff"
android:textSize="25sp"
android:textStyle="bold" />
</LinearLayout>
</android.support.v7.widget.Toolbar>
<android.support.v4.widget.DrawerLayout xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/nav_drawer"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.sv_laptop03.myapp.Profile">
<TabHost
android:id="@+id/tabHost"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"></TabWidget>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:id="@+id/tab1"
android:layout_width="match_parent"
android:layout_height="match_parent"></RelativeLayout>
<RelativeLayout
android:id="@+id/tab2"
android:layout_width="match_parent"
android:layout_height="match_parent">
</RelativeLayout>
<RelativeLayout
android:id="@+id/tab3"
android:layout_width="match_parent"
android:layout_height="match_parent"></RelativeLayout>
<RelativeLayout
android:id="@+id/tab4"
android:layout_width="match_parent"
android:layout_height="match_parent"></RelativeLayout>
<RelativeLayout
android:id="@+id/tab5"
android:layout_width="match_parent"
android:layout_height="match_parent"></RelativeLayout>
</FrameLayout>
</RelativeLayout>
</TabHost>
</RelativeLayout>
<android.support.design.widget.NavigationView
android:id="@+id/navigation_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:headerLayout="@layout/headerview"
app:menu="@menu/drawer" />
</android.support.v4.widget.DrawerLayout>
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