问android studio中的渐变使用

EN

<?xml version="1.0" encoding="utf-8"?>
   <shape>
           <gradient android:startColor="@color/colorAccent"
               android:centerColor="@color/colorAccent"
               android:endColor="@color/black"
                android:angle="90"/>
            <corners android:radius="10dp"></corners>
        </shape>

    <?xml version="1.0" encoding="utf-8"?>
         <shape xmlns:android="http://schemas.android.com/apk/res/android"
             android:shape="oval">
              <gradient
                  android:angle="270"
                  android:startColor="#A70797"
                  android:endColor="#0723B5"
             />
         </shape>

Then from floating action buttons, I selected the icon ic_menu_add

Actual floating action button is described like this



    <com.google.android.material.floatingactionbutton.FloatingActionButton
            android:id="@+id/fab_1"
            style="@style/Myfbutton"
            android:focusable="true"
            app:fabSize="mini"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:srcCompat="@drawable/fback" />

    For style I have

    <style name="Myfbutton">Myfbutton
            <item name="android:shape">oval</item>item>
            <item name="android:layout_width">42dp</item>
            <item name="android:layout_height">42dp</item>
            <item name="android:clickable">true</item>
            <item name="android:layout_margin">16sp</item>
    </style>