Material design Spinner using TextInputLayout.OutlinedBox styling

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I am assuming you want to have an Exposed drop-down menu inside the TextInputLayout I had the same problem, what you can do is use AutoCompleteTextView inside your TextInputLayout as in the following in the XML. here’s an example of how I approached the issue.

<LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:paddingRight="30dp"
            android:paddingEnd="30dp"
            tools:ignore="RtlSymmetry"
            android:layout_margin="5dp">

            <ImageView
                android:layout_width="30dp"
                android:layout_margin="10dp"
                android:layout_height="match_parent"
                app:srcCompat="@drawable/ic_location_city_black_24dp"
                android:layout_gravity="center"
                />




        <com.google.android.material.textfield.TextInputLayout

            style="@style/Widget.MaterialComponents.TextInputLayout.FilledBox.ExposedDropdownMenu"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="Type"
            android:orientation="horizontal"
            >



            <AutoCompleteTextView
                android:id="@+id/filled_exposed_dropdown"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:inputType="none"/>

        </com.google.android.material.textfield.TextInputLayout>


        </LinearLayout>

    </LinearLayout>

You will also need an item layout resource to populate the dropdown popup. The example below provides a layout that follows the Material Design guidelines.

res/layout/dropdown_menu_popup_item.xml

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="16dp"
    android:ellipsize="end"
    android:maxLines="1"
    android:textAppearance="?attr/textAppearanceSubtitle1"/>

In your class add the following code depending on what you want.

String[] type = new String[] {"Bed-sitter", "Single", "1- Bedroom", "2- Bedroom","3- Bedroom"};

        ArrayAdapter<String> adapter =
                new ArrayAdapter<>(
                        this,
                        R.layout.dropdown_menu_popup_item,
                        type);

        AutoCompleteTextView editTextFilledExposedDropdown =
                findViewById(R.id.filled_exposed_dropdown);
        editTextFilledExposedDropdown.setAdapter(adapter);

incase this doesn’t help kindly check Exposed Dropdown Menus in material design page.
[https://material.io/develop/android/components/menu/][1]

This is my first answer on stack overflow I hope it helps.

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