Android drawable speech bubble

I've looked for days and can not find any good leads on how I can draw a bubble or where a draw 9 patch images is to use as a background. i am a terrible artist --Can anyone help?

the best sample i found is here on stackoverflow, but it's written in objective c

How to draw a "speech bubble" on an iPhone?

Thank you

If you are creating a chat screen you are probably going to want to implement an incoming speech bubble and an outgoing speech bubble. Here is how I did that :

shape_bg_incoming_bubble.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <rotate
            android:fromDegrees="-45"
            android:pivotX="0%"
            android:pivotY="0%"
            android:toDegrees="0" >
            <shape android:shape="rectangle" >
                <solid android:color="@color/primary" />
            </shape>
        </rotate>
    </item>
    <item android:left="16dp">
        <shape android:shape="rectangle" >
            <solid android:color="@color/primary" />
            <corners android:radius="4dp" />
        </shape>
    </item>
</layer-list>

shape_bg_outgoing_bubble.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <rotate
            android:fromDegrees="45"
            android:pivotX="100%"
            android:pivotY="0%"
            android:toDegrees="0" >
            <shape android:shape="rectangle" >
                <solid android:color="@color/grey_500" />
            </shape>
        </rotate>
    </item>
    <item android:right="16dp">
        <shape android:shape="rectangle" >
            <solid android:color="@color/grey_500" />
            <corners android:radius="4dp" />
        </shape>
    </item>
</layer-list>

I know its bit too late for this. For those, who don't want to use 9-patch images yet want to cast shadows from speech bubble. This is closest I could get to WhatsApp speech bubble. And thanks to @toobsco42 for the answer above.

Here you go..

Incoming Speech Bubble :

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

<!--Shadow Layers-->

<item>
    <rotate
        android:fromDegrees="-35"
        android:pivotX="0%"
        android:pivotY="0%"
        android:toDegrees="0">
        <shape android:shape="rectangle">
            <corners android:radius="4dp"/>
            <padding
                android:bottom="1px"
                android:left="1px"
                android:right="1px"/>
            <solid android:color="#01000000" />
        </shape>
    </rotate>
</item>
<item android:left="8dp">
    <shape android:shape="rectangle">
        <padding
            android:bottom="1px"
            android:left="1px"
            android:right="1px"/>
        <solid android:color="#01000000" />
        <corners android:radius="8dp" />
    </shape>
</item>

<!--===============-->
<item>
    <rotate
        android:fromDegrees="-35"
        android:pivotX="0%"
        android:pivotY="0%"
        android:toDegrees="0">
        <shape android:shape="rectangle">
            <corners android:radius="4dp"/>
            <padding
                android:bottom="1px" />
            <solid android:color="#09000000" />
        </shape>
    </rotate>
</item>
<item android:left="8dp">
    <shape android:shape="rectangle">
        <padding
            android:bottom="1px" />
        <solid android:color="#09000000" />
        <corners android:radius="8dp" />
    </shape>
</item>

<!--===============-->

<item>
    <rotate
        android:fromDegrees="-35"
        android:pivotX="0%"
        android:pivotY="0%"
        android:toDegrees="0">
        <shape android:shape="rectangle">
            <corners android:radius="4dp"/>
            <padding
                android:bottom="1px"
                android:left="1px"
                android:right="1px"/>
            <solid android:color="#10000000" />
        </shape>
    </rotate>
</item>
<item android:left="8dp">
    <shape android:shape="rectangle">
        <padding
            android:bottom="1px"
            android:left="1px"
            android:right="1px"/>
        <solid android:color="#10000000" />
        <corners android:radius="8dp" />
    </shape>
</item>

<!--ForeGround-->

<item>
    <rotate
        android:fromDegrees="-35"
        android:pivotX="0%"
        android:pivotY="0%"
        android:toDegrees="0">
        <shape android:shape="rectangle">
            <corners android:radius="4dp"/>
            <solid android:color="@color/colorWhite" />
        </shape>
    </rotate>
</item>
<item android:left="8dp">
    <shape android:shape="rectangle">
        <solid android:color="@color/colorWhite" />
        <corners android:radius="8dp" />
    </shape>
</item>

</layer-list>

Outgoing Speech Bubble :

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

<!--Shadow Layer-->

<item>
    <rotate
        android:fromDegrees="40"
        android:pivotX="100%"
        android:pivotY="0%"
        android:toDegrees="0">
        <shape android:shape="rectangle">
            <corners android:radius="4dp" />
            <padding
                android:bottom="1px"
                android:left="1px"
                android:right="1px" />
            <solid android:color="#01000000" />
        </shape>
    </rotate>
</item>
<item android:right="10dp">
    <shape android:shape="rectangle">
        <corners android:radius="4dp" />
        <padding
            android:bottom="1px"
            android:left="1px"
            android:right="1px" />
        <solid android:color="#01000000" />
    </shape>
</item>

<!--===============-->

<item>
    <rotate
        android:fromDegrees="40"
        android:pivotX="100%"
        android:pivotY="0%"
        android:toDegrees="0">
        <shape android:shape="rectangle">
            <corners android:radius="4dp" />
            <padding android:bottom="1px" />
            <solid android:color="#09000000" />
        </shape>
    </rotate>
</item>
<item android:right="10dp">
    <shape android:shape="rectangle">
        <corners android:radius="4dp" />
        <padding android:bottom="1px" />
        <solid android:color="#09000000" />
    </shape>
</item>

<!--===============-->

<item>
    <rotate
        android:fromDegrees="40"
        android:pivotX="100%"
        android:pivotY="0%"
        android:toDegrees="0">
        <shape android:shape="rectangle">
            <corners android:radius="4dp" />
            <padding
                android:bottom="1px"
                android:left="1px"
                android:right="1px" />
            <solid android:color="#10000000" />
        </shape>
    </rotate>
</item>
<item android:right="10dp">
    <shape android:shape="rectangle">
        <corners android:radius="4dp" />
        <padding
            android:bottom="1px"
            android:left="1px"
            android:right="1px" />
        <solid android:color="#10000000" />
    </shape>
</item>

<!--===============-->


<!--ForeGround-->

<item>
    <rotate
        android:fromDegrees="40"
        android:pivotX="100%"
        android:pivotY="0%"
        android:toDegrees="0">
        <shape android:shape="rectangle">
            <solid android:color="#CBEBFC" />
        </shape>
    </rotate>
</item>
<item android:right="10dp">
    <shape android:shape="rectangle">
        <solid android:color="#CBEBFC" />
        <corners android:radius="4dp" />
    </shape>
</item>

</layer-list>

Use the paddings properly in the layout. I used these values :

<TextView
    android:id="@+id/text_message_incoming"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:background="@drawable/bg_speech_bubble_incoming"
    android:lineSpacingExtra="2dp"
    android:paddingLeft="20dp"
    android:paddingTop="4dp"
    android:paddingRight="10dp"
    android:paddingBottom="10dp"
    android:text="Hi, How are you?"
    android:textColor="@color/colorBlack"
    android:textSize="13.5dp"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintWidth_max="wrap"
    app:layout_constraintWidth_percent="0.8" />

My output came out like this: