I have a few button in cardview but i can't drag it to anywhere i want.
in fact i want set , "next" button of media player to right of "play" button .

this is my xml code :

```html
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="90dp"
        app:cardBackgroundColor="?attr/colorPrimaryDark"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        app:cardCornerRadius="0dp"
        app:cardElevation="12dp">

    <Button
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_gravity="center_horizontal|center_vertical"
        android:background="@mipmap/play" />

        <Button
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:background="@mipmap/next"
            android:layout_gravity="center_vertical|end"/>

        <Button
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:background="@mipmap/previous"
            android:layout_gravity="center_vertical|start"/>

        <SeekBar
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/seekBar2"
            android:max="100"/>

    </android.support.v7.widget.CardView>

</RelativeLayout>
```

it's result :

[pic result](https://i.stack.imgur.com/AEFtA.png)

and what i want is :

[what i want image](https://i.stack.imgur.com/jWZzi.jpg)