How to change the color of the edittext line programmatically

From the appcompat-v7 version and assign it to EditText via the android:theme attribute.

In the file res/style.xml declare a new style :

<style name="MyEditTextTheme">
    <item name="colorControlNormal">#ff0000</item>
    <item name="colorControlActivated">#00ff00</item>
    <item name="colorControlHighlight">@color/accent_material_light</item>
</style>

Notes:

• Change the colors to your liking.
• With these settings the line is red when "out focus" and green "in focus"
• If your theme is dark use @color/accent_material_dark
• In order for your Activity to work, you will inherit from AppCompatActivity

Add the android:theme attribute to the EditText declaration:

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    .....
    .....
    android:theme="@style/MyEditTextTheme"/>

Adapted from here

You can not change the color of the line. You can change the background of EditText and you can put a transparent% color with a colored line underneath, like this for example:

Togeneratethese%color%onlineyoucanusethissite Android Holo Generator .

However, I recommend downloading the MaterialEditText library that implements EditTexts with Material Design and has the ability to programmatically change the color of the line