Add Shadow to Custom Shape on Android

How to add a blurred drop shadow to a button?

Well i found the solution: we need to create 9.png with blurred drop-shadow via this generator and pass it to drawable layer-list that contain button background gradient:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:drawable="@drawable/blurred_9_path_png" />
    <item>
        <shape android:shape="rectangle" android:padding="10dp">
            <corners android:radius="45dp" />
            <gradient
                android:angle="45"
                android:endColor="@color/facebook_btn_fill_grad2"
                android:startColor="@color/facebook_btn_fill_grad1"
                android:type="linear" />
            <padding
                android:bottom="0dp"
                android:left="0dp"
                android:right="0dp"
                android:top="0dp" />
        </shape>
    </item>

</layer-list> 

After that we can use such drawables with different 9.path blurred shadow to create selector.

how to add shadow effect on drawable in android

You can try by implementing a layer-list that will act as the background for the LinearLayout and add your view inside this.

Quote from an answer to this question:

Add background_with_shadow.xml file to res/drawable. Containing:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item >
        <shape 
            android:shape="rectangle">
        <solid android:color="@android:color/darker_gray" />
        <corners android:radius="5dp"/>
        </shape>
    </item>
    <item android:right="1dp" android:left="1dp" android:bottom="2dp">
        <shape 
            android:shape="rectangle">
        <solid android:color="@android:color/white"/>
        <corners android:radius="5dp"/>
        </shape>
    </item>
</layer-list>

Then add the the layer-list as background in your LinearLayout.

<LinearLayout
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:background="@drawable/background_with_shadow"/>

EDIT

You can create seprate xml for creating gray image like thsis:

----right_bubble_shdw_chat_drawable

 <?xml version="1.0" encoding="utf-8"?>
 <shape android:shape="rectangle" xmlns:android="http://schemas.android.com/apk/res/android">
        <corners android:radius="15dp" />

        <solid android:color="@android:color/darker_gray" />

        <padding
            android:bottom="10dp"
            android:left="10dp"
            android:right="10dp"
            android:top="10dp" />

        <size
            android:height="@dimen/normal_button_height"
            android:width="@dimen/normal_button_width" />

--- for corner pointer 'chat_laftarraow_shdw'

  <?xml version="1.0" encoding="utf-8"?>
   <layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item >
     <rotate
        android:fromDegrees="90"
        android:toDegrees="-90"
        android:pivotX="50%"
        android:pivotY="50%" >
    <rotate
        android:fromDegrees="45"
        android:toDegrees="45"
        android:pivotX="-40%"
        android:pivotY="86%" >
        <shape
            android:shape="rectangle"  >
            <stroke android:color="@android:color/darker_gray" android:width="1dp"/>
            <solid
                android:color="@android:color/darker_gray"  />

        </shape>
       </rotate>
       </rotate>
      </item>
    </layer-list>

------- I am using them like

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
   <View
    android:id="@+id/left_chatArror"
    android:layout_width="20dp"
    android:layout_height="20dp"
    android:layout_alignParentRight="true"
    android:layout_marginTop="6dp"
    android:background="@drawable/chat_laftarraow"/>

<RelativeLayout

    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:maxWidth="220dp"
    android:layout_marginRight="-3dp"
    android:orientation="horizontal"
    android:layout_toLeftOf="@+id/left_chatArror"
    android:paddingBottom="5dp"
    android:paddingTop="5dp"
    android:background="@drawable/right_bubble_chat_drawable">

    </RelativeLayout>

   <View
    android:id="@+id/left_chatArrorShdw"
    android:layout_width="20dp"
    android:layout_height="20dp"
    android:layout_alignParentRight="true"
    android:layout_marginTop="15dp"
    android:background="@drawable/chat_laftarraow_shdw"/>

<RelativeLayout

    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:maxWidth="220dp"
    android:layout_marginRight="-3dp"
    android:orientation="horizontal"
    android:layout_toLeftOf="@+id/left_chatArror"
    android:paddingBottom="5dp"
    android:paddingTop="5dp"
    android:background="@drawable/right_bubble_shdw_chat_drawable">
  </RelativeLayout>

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