Custom Popup

I’m trying to make a custom popup, similar to the one in the photo, by putting a close button at the top and centering it in the middle of the screen, does anyone know how I do it?
I searched for some codes, but nothing very complete

With DialogFragment you get that way below

mButton.setOnclickListener(new OnclickListener(){
       test();

});

public void test(){
    Dialog dialog = new Dialog(this, R.style.FullHeightDialog);
    dialog.setContentView(R.layout.seu_layout_customizado);
    dialog.show();
}

Creating XML

• Create a root LinearLayout
• Creates another LinearLayout with vertical orientation, where it will contain the X button, title, and description.
• Creates a View ( <View android_layout_width="fill_parent" android_layout_height="1dp"/> ) to represent the line. To represent this grouping of icons and text (gps, wifi and wireless network) creates a RelativeLayout.

• For the confirmation button, add in the LinearLayout root.

  <LinearLayout xmlns_android="http://schemas.android.com/apk/res/android"
  android_layout_width="match_parent"
  android_layout_height="match_parent">
  
  <ImageView
      android_layout_width="match_parent"
      android_layout_height="wrap_content"
      android_background="x"/>
  <TextView
      android_layout_width="wrap_content"
      android_layout_height="wrap_content"
      android_text="Melhore..."/>
  
  <TextView
      android_layout_width="wrap_content"
      android_layout_height="wrap_content"
      android_text="Para garantir..."/>
  <RelativeLayout
      android_layout_width="wrap_content"
      android_layout_height="wrap_content">
      gps
      rede
      wifi
      </RelativeLayout>
  <Button
      android_layout_width="wrap_content"
      android_layout_height="wrap_content" />