This blog will help you to Create shapes,Border,selector and Drawable using xml in Android.

1.Selector for a button: Create xml file named background_selector.xml in res/drawable and write the bellow code in that

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- Non focused states -->
    <item
        android:state_focused="false"
        android:state_selected="false"
        android:state_pressed="false"
        android:drawable="@drawable/home_unselected" />
    <item
        android:state_focused="false"
        android:state_selected="true"
        android:state_pressed="false"
        android:drawable="@drawable/home" />
    <!-- Focused states -->
    <item
        android:state_focused="true"
        android:state_selected="true"
        android:state_pressed="false"
        android:drawable="@drawable/home" />
    <!-- Pressed state -->
    <item
        android:state_pressed="true"
        android:drawable="@drawable/home" />
</selector>

Then put this as background:

<ImageView
  android:id="@+id/imageView"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:src="@drawable/background_selector"
  android:gravity="center" />

2.Selector for CheckBox: Create xml file named checkbox_selector.xml in res/drawable and write the following code in that

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/tick" android:state_checked="true"/>
    <item android:drawable="@drawable/un_tick" android:state_checked="false"/>

</selector>

then put this as background:

<CheckBox
android:id="@+id/do_not_show_checkbox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:button="@drawable/checkbox_selector" />

3.Create List row selector: Create xml file named list_selector.xml in res/drawable and write the following code in this

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@android:color/transparent" android:state_pressed="false" android:state_selected="false"/>
    <item android:drawable="#9DCAF1" android:state_pressed="true"/>
    <item android:drawable="#9DCAF1" android:state_pressed="false" android:state_selected="true"/>

</selector>

then use this as background in your layout that you want to set as list row as below:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/messages_list_rows"
    android:layout_width="fill_parent"
    android:layout_height="90dip"
    android:background="@drawable/list_selector" >

    <TextView
            android:id="@+id/name"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:textColor="#B3FFFF"
            android:textSize="14dip" />
</RelativeLayout>

4.Create a border with round edges: Create xml file named layout_background.xml in res/drawable and write the following code in this

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:padding="10dp"
    android:shape="rectangle" >

    <gradient
        android:angle="270"
        android:endColor="#d9dff9"
        android:startColor="#d9dff9" />

    <corners
        android:bottomLeftRadius="10dp"
        android:bottomRightRadius="10dp"
        android:topLeftRadius="10dp"
        android:topRightRadius="10dp" />

</shape>

then use this as background in your layout as below:

<RelativeLayout
android:id="@+id/user_image_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/layout_background">
</RelativeLayout>

5.Create red circle : Create xml file named custom_circle.xml in res/drawable and write the following code in this

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval" >

    <solid android:color="#C4110C" />

    <size
        android:height="20dp"
        android:width="20dp" />

</shape>

Hope this will help you :)