Android Button with rounded corners, ripple effect and no shadow

I finally solved it with below code. This achieve rounded corners for button. Also, for Android Version >= V21, it uses ripple effect. For earlier Android version, button color changes when it is clicked, based on android:state_pressed, android:state_focused, etc.

In layout xml file:

<Button
    style="?android:attr/borderlessButtonStyle"
    android:id="@+id/buy_button"
    android:layout_width="0dp"
    android:layout_weight="1"
    android:layout_height="match_parent"
    android:gravity="center"
    android:background="@drawable/green_trading_button_effect"
    android:textColor="@android:color/white"
    android:text="BUY" />

For button onclick ripple effect (Android >= v21) :

drawable-v21/green_trading_button_effect.xml

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

    <item android:id="@android:id/mask">
        <shape android:shape="rectangle">
            <solid android:color="@android:color/white" />
            <corners android:radius="5dp" />
        </shape>
    </item>

    <item android:drawable="@drawable/green_trading_button" />
</ripple>

For earlier Android version, just change background color during onclick:

drawable/green_trading_button_effect.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@drawable/green_trading_button_selected" />
    <item android:state_focused="true" android:drawable="@drawable/green_trading_button_selected" />
    <item android:state_selected="true" android:drawable="@drawable/green_trading_button_selected" />
    <item android:drawable="@drawable/green_trading_button" />
</selector>

drawable/green_trading_button.xml

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

    <solid android:color="#ffa6c575"/>
    <!-- rounded corners -->
    <corners android:radius="5dp" />
</shape>

drawable/green_trading_button_selected.xml

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

    <solid android:color="#ffc5dca8"/>
    <!-- corners corners -->
    <corners android:radius="5dp" />
</shape>