How to fill fully remaning space in linear layout? - android-layout

Question

I have a problem with layout in my app that I am writing. I want to make some domestic changes like buttons to be in one column and they should be on right hand side. Additionally EditText with Buttons should be around middle of the screen ( I attach screenshot of how it looks for now). After reading few of similar problems the main idea was to modify textView1 on layout_width="fill_parent", but that doesnt make any difference. Most of changes that I am trying doesnt seems to have any effect, do you know why ?Current Layout
I am also giving the adapter view layout xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="100">
<TextView
android:gravity="center"
android:text="TextView1"
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="#+id/textView1"
android:textSize="18sp"
android:layout_weight="66.6"/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_weight="33.3">
<Button
android:id="#+id/removeBtn"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:background="#drawable/custom_btn_remove"
android:backgroundTint="#color/black" />
<EditText
android:id="#+id/itemAmount"
android:layout_width="40dp"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center_horizontal"
android:inputType="number"
android:minEms="1"
android:text="1"
android:textAlignment="center"
android:textAllCaps="false"
android:textColor="#android:color/black"
android:textSize="20sp" />
<Button
android:id="#+id/addBtn"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:background="#drawable/custom_btn_add"
android:backgroundTint="#color/black" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/floatingActionButton"
android:layout_marginLeft="60dp"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_alignParentRight="true"
android:layout_weight="1"
android:clickable="true"
app:fabCustomSize="40dp"
app:srcCompat="?android:attr/textCheckMarkInverse" />
</LinearLayout>
</LinearLayout>