tachiyomi/app/src/main/res/layout/extension_detail_header.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="wrap_content"
    android:orientation="vertical">

    <TextView
        android:id="@+id/warning_banner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?attr/colorError"
        android:gravity="center"
        android:padding="16dp"
        android:textColor="?attr/colorOnError"
        android:visibility="gone"
        tools:visibility="visible" />

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="16dp">

        <ImageView
            android:id="@+id/icon"
            android:layout_width="56dp"
            android:layout_height="56dp"
            android:src="@mipmap/ic_launcher"
            app:layout_constraintBottom_toBottomOf="@id/pkgname"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            tools:ignore="ContentDescription" />

        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:elevation="3dp"
            android:textAppearance="?attr/textAppearanceTitleMedium"
            app:layout_constraintStart_toEndOf="@id/icon"
            app:layout_constraintTop_toTopOf="parent"
            tools:text="Tachiyomi: Extension" />

        <TextView
            android:id="@+id/version"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:elevation="3dp"
            android:gravity="center"
            android:textAppearance="?attr/textAppearanceBodySmall"
            app:layout_constraintStart_toStartOf="@id/title"
            app:layout_constraintTop_toBottomOf="@id/title"
            tools:text="Version: 1.0.0" />

        <TextView
            android:id="@+id/lang"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:elevation="3dp"
            android:gravity="center"
            android:textAppearance="?attr/textAppearanceBodySmall"
            app:layout_constraintStart_toStartOf="@id/title"
            app:layout_constraintTop_toBottomOf="@id/version"
            tools:text="Language: English" />

        <TextView
            android:id="@+id/nsfw"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:elevation="3dp"
            android:gravity="center"
            android:text="@string/ext_nsfw_warning"
            android:textAppearance="?attr/textAppearanceBodySmall"
            android:textColor="?attr/colorError"
            android:visibility="gone"
            app:layout_constraintStart_toStartOf="@id/title"
            app:layout_constraintTop_toBottomOf="@id/lang"
            tools:visibility="visible" />

        <TextView
            android:id="@+id/pkgname"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:elevation="3dp"
            android:ellipsize="middle"
            android:singleLine="true"
            android:textAppearance="?attr/textAppearanceBodySmall"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@id/title"
            app:layout_constraintTop_toBottomOf="@id/nsfw"
            tools:text="eu.kanade.tachiyomi.extension.en.myext" />

        <Button
            android:id="@+id/btn_uninstall"
            style="@style/Widget.Tachiyomi.Button.OutlinedButton"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="4dp"
            android:text="@string/ext_uninstall"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/btn_app_info"
            app:layout_constraintTop_toBottomOf="@id/pkgname" />

        <Button
            android:id="@+id/btn_app_info"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:layout_marginStart="4dp"
            android:text="@string/ext_app_info"
            app:layout_constraintStart_toEndOf="@+id/btn_uninstall"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toBottomOf="@id/pkgname" />

    </androidx.constraintlayout.widget.ConstraintLayout>

    <com.google.android.material.divider.MaterialDivider
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>