mTHMMY/app/src/main/res/layout/activity_upload.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".activities.UploadActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="@dimen/appbar_padding_top"
        android:theme="@style/ToolbarTheme">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/ToolbarTheme" />
    </android.support.design.widget.AppBarLayout>

    <ScrollView
        android:id="@+id/upload_outer_scrollview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="top|start"
        android:background="@color/background"
        android:paddingEnd="@dimen/activity_horizontal_margin"
        android:paddingStart="@dimen/activity_horizontal_margin"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        tools:context="gr.thmmy.mthmmy.activities.UploadActivity">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/background"
            android:focusableInTouchMode="true"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="6dp"
                android:layout_marginTop="6dp"
                android:gravity="center"
                android:text="@string/upload_category_pre_text"
                android:textAlignment="center"
                android:textColor="@color/accent" />

            <LinearLayout
                android:id="@+id/upload_spinners"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/background"
                android:orientation="vertical">

                <android.support.v7.widget.AppCompatSpinner
                    android:id="@+id/upload_spinner_category_root"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginBottom="6dp"
                    android:layout_marginTop="6dp"
                    android:popupBackground="@color/primary" />
            </LinearLayout>

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="6dp"
                android:gravity="center"
                android:text="@string/upload_title_description_pre_text"
                android:textAlignment="center"
                android:textColor="@color/accent" />

            <android.support.v7.widget.AppCompatButton
                android:id="@+id/upload_title_description_builder"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="6dp"
                android:gravity="center"
                android:text="@string/upload_title_description_builder"
                android:textAlignment="center"
                android:textColor="@color/accent" />

            <android.support.design.widget.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="6dp"
                android:layout_marginTop="6dp">

                <EditText
                    android:id="@+id/upload_title"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="@string/upload_title_hint"
                    android:inputType="text"
                    android:maxLength="500" />
            </android.support.design.widget.TextInputLayout>

            <android.support.design.widget.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="6dp"
                android:layout_marginTop="6dp">

                <EditText
                    android:id="@+id/upload_description"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="@string/upload_description_hint"
                    android:inputType="textMultiLine"
                    android:maxLines="3" />
            </android.support.design.widget.TextInputLayout>

            <TextView
                android:id="@+id/upload_select_file_button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:layout_marginBottom="6dp"
                android:layout_marginTop="6dp"
                android:drawablePadding="5dp"
                android:drawableStart="@drawable/ic_insert_drive_file"
                android:gravity="center_vertical"
                android:text="@string/upload_select_file"
                android:textAlignment="center"
                android:textColor="@color/primary_text" />

            <FrameLayout
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_gravity="bottom|end"
                android:layout_weight="4">

                <android.support.v7.widget.AppCompatButton
                    android:id="@+id/upload_upload_button"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="bottom|end"
                    android:text="@string/upload_upload_button" />
            </FrameLayout>

        </LinearLayout>
    </ScrollView>

    <me.zhanghai.android.materialprogressbar.MaterialProgressBar
        android:id="@+id/progressBar"
        style="@style/Widget.MaterialProgressBar.ProgressBar.Horizontal.NoPadding"
        android:layout_width="match_parent"
        android:layout_height="@dimen/progress_bar_height"
        android:indeterminate="true"
        android:visibility="invisible"
        app:layout_anchor="@id/appbar"
        app:layout_anchorGravity="bottom|center"
        app:mpb_indeterminateTint="@color/accent"
        app:mpb_progressStyle="horizontal" />
</android.support.design.widget.CoordinatorLayout>