gallery-android/app/src/main/res/layout/activity_new_post.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:background="@color/bgColor"
    tools:context=".NewPostActivity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <LinearLayout
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:orientation="vertical"
                android:padding="32dp"
                android:background="@drawable/card_background"
                android:elevation="8dp"
                android:layout_marginTop="24dp"
                android:layout_marginBottom="24dp"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintWidth_percent="0.85"
                app:layout_constraintVertical_bias="0.5">

                <!-- Header -->
                <TextView
                    android:id="@+id/headerTV"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="Create New Post"
                    android:textSize="32sp"
                    android:textStyle="bold"
                    android:textColor="#011f4b"
                    android:gravity="center"
                    android:layout_marginBottom="40dp"/>

                <!-- Description Label -->
                <TextView
                    android:id="@+id/descriptionLabelTV"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="Description"
                    android:textSize="16sp"
                    android:textStyle="bold"
                    android:textColor="#03396c"
                    android:layout_marginBottom="8dp"/>

                <!-- Description Input -->
                <EditText
                    android:id="@+id/descriptionET"
                    android:layout_width="match_parent"
                    android:layout_height="120dp"
                    android:hint="Enter post description"
                    android:textColorHint="#6497b1"
                    android:textColor="#011f4b"
                    android:background="@drawable/edit_text_background"
                    android:padding="16dp"
                    android:inputType="textMultiLine"
                    android:gravity="top|start"
                    android:layout_marginBottom="24dp"/>

                <!-- Media Type Label -->
                <TextView
                    android:id="@+id/mediaTypeLabelTV"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="Media Type"
                    android:textSize="16sp"
                    android:textStyle="bold"
                    android:textColor="#03396c"
                    android:layout_marginBottom="8dp"/>

                <!-- Media Type Radio Group -->
                <RadioGroup
                    android:id="@+id/mediaTypeRG"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:orientation="horizontal"
                    android:layout_marginBottom="24dp">

                    <RadioButton
                        android:id="@+id/photoRB"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Photo"
                        android:textColor="#03396c"
                        android:buttonTint="#005b96"
                        android:checked="true"/>

                    <RadioButton
                        android:id="@+id/videoRB"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Video"
                        android:textColor="#03396c"
                        android:buttonTint="#005b96"
                        android:layout_marginStart="24dp"/>
                </RadioGroup>

                <!-- Category Label -->
                <TextView
                    android:id="@+id/categoryLabelTV"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="Category"
                    android:textSize="16sp"
                    android:textStyle="bold"
                    android:textColor="#03396c"
                    android:layout_marginBottom="8dp"/>

                <!-- Category Spinner -->
                <Spinner
                    android:id="@+id/categorySpinner"
                    android:layout_width="match_parent"
                    android:layout_height="56dp"
                    android:background="@drawable/edit_text_background"
                    android:padding="16dp"
                    android:layout_marginBottom="24dp"
                    android:spinnerMode="dropdown"
                    android:popupBackground="#FFFFFF"/>

                <!-- Select Media Label -->
                <TextView
                    android:id="@+id/selectMediaLabelTV"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="Select Media"
                    android:textSize="16sp"
                    android:textStyle="bold"
                    android:textColor="#03396c"
                    android:layout_marginBottom="8dp"/>

                <!-- Choose File Button -->
                <Button
                    android:id="@+id/selectMediaBtn"
                    android:layout_width="match_parent"
                    android:layout_height="56dp"
                    android:text="Choose File"
                    android:textSize="16sp"
                    android:textStyle="bold"
                    android:textColor="@color/white"
                    android:background="@drawable/button_background"
                    android:elevation="4dp"
                    android:stateListAnimator="@null"
                    android:layout_marginBottom="12dp"/>

                <!-- Selected File Text -->
                <TextView
                    android:id="@+id/selectedFileTV"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="No file selected"
                    android:textSize="14sp"
                    android:textColor="#6497b1"
                    android:gravity="center"
                    android:layout_marginBottom="16dp"/>

                <!-- Preview Image -->
                <ImageView
                    android:id="@+id/previewIV"
                    android:layout_width="match_parent"
                    android:layout_height="220dp"
                    android:layout_gravity="center"
                    android:visibility="gone"
                    android:scaleType="centerCrop"
                    android:background="@drawable/edit_text_background"
                    android:layout_marginBottom="24dp"
                    android:contentDescription="Preview"/>

                <!-- Submit Button -->
                <Button
                    android:id="@+id/submitBtn"
                    android:layout_width="match_parent"
                    android:layout_height="56dp"
                    android:text="Post"
                    android:textSize="16sp"
                    android:textStyle="bold"
                    android:textColor="@color/white"
                    android:background="@drawable/button_background"
                    android:elevation="4dp"
                    android:stateListAnimator="@null"
                    android:layout_marginBottom="12dp"/>

                <!-- Cancel Button -->
                <Button
                    android:id="@+id/cancelBtn"
                    android:layout_width="match_parent"
                    android:layout_height="56dp"
                    android:text="Cancel"
                    android:textSize="16sp"
                    android:textStyle="bold"
                    android:textColor="@color/white"
                    android:background="@drawable/button_background"
                    android:stateListAnimator="@null"/>

            </LinearLayout>

        </androidx.constraintlayout.widget.ConstraintLayout>

    </ScrollView>

</androidx.constraintlayout.widget.ConstraintLayout>