<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="+"
        android:id="@+id/plus_btn"
        android:textSize="30dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@android:color/white"

    android:weightSum="1">
    <TextView
        android:id="@+id/dialog_main_txt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:text="@string/dialog_main_txt"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:background="@android:color/white"
        android:textColor="#0d81e0"
        android:textSize="20sp"
        android:gravity="center_vertical">
    </TextView>

    <Button
        android:layout_width="242dp"
        android:layout_height="3dp"
        android:id="@+id/button3"
        android:background="@mipmap/line"
        android:layout_gravity="center" />
    <EditText
        android:layout_width="251dp"
        android:layout_height="53dp"
        android:id="@+id/dialog_main_edit1"
        android:hint="@string/main_edit_hint1"
        android:focusable="true"
        android:textColorHighlight="#ff7eff15"
        android:textColorHint="#0d81e0"
        android:layout_marginTop="46dp"
        android:layout_below="@+id/imageView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_gravity="center_horizontal"
        android:inputType="number|numberDecimal"
        android:digits="0123456789"
        android:textAppearance="@android:style/TextAppearance.Small"
        android:text="Введите 123" />
    <EditText
        android:layout_width="243dp"
        android:layout_height="wrap_content"
        android:id="@+id/dialog_main_edit2"
        android:hint="@string/main_edit_hint2"
        android:focusable="true"
        android:textColorHighlight="#ff7eff15"
        android:textColorHint="#0d81e0"
        android:layout_marginTop="46dp"
        android:layout_below="@+id/imageView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_gravity="center_horizontal"
        android:inputType="number|numberDecimal"
        android:digits="0123456789"
        android:textAppearance="@android:style/TextAppearance.Small"
        android:text="Введите 123" />

    <EditText
        android:layout_width="243dp"
        android:layout_height="wrap_content"
        android:id="@+id/dialog_main_edit3"
        android:hint="@string/main_edit_hint2"
        android:focusable="true"
        android:textColorHighlight="#ff7eff15"
        android:textColorHint="#0d81e0"
        android:layout_marginTop="46dp"
        android:layout_below="@+id/imageView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_gravity="center_horizontal"
      
        android:text="Введите Название папки" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/textView3" />

    <LinearLayout
        android:layout_width="269dp"
        android:layout_height="wrap_content"
        android:background="@android:color/white"
        android:layout_gravity="center_horizontal">
        <Button
            android:id="@+id/dialog_main_btn1"
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:text="OK"
            
            android:layout_marginLeft="15dp">
        </Button>
        <Button
            android:id="@+id/dialog_main_btn2"
            android:layout_width="80dp"
            android:layout_height="80dp"
            android:text="Cancel"
            
            android:layout_marginLeft="90dp">
        </Button>
    </LinearLayout>
</LinearLayout>

 public class Dialog_main extends DialogFragment implements View.OnClickListener {

 public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
}