xml 编辑文本更改线条颜色。字体：https：//stackoverflow.com/questions/24677414/how-to-change-line-color-in-edittext。

Posted 2021-05-17

<!-- 
android:backgroundTint for EditText works only on API21+ . Because of it, we have to use support library and AppCompatEditText.

Note: we have to use app:backgroundTint instead of android:backgroundTint.

--> 

<android.support.v7.widget.AppCompatEditText

      app:backgroundTint="@color/blue_gray_light" />