AppCompat and EditText different underline on different API

问题

I'm trying to make underline line color change for EditText (it will be used for input's validation, so it must be able to change in runtime).

I'm using AppCompat library. The problem is that on API 21 and above, I see transparent black line (gray overlay), instead of bolded version.

How to make it the same as in API 16?

I used this code to change tint:

    final Drawable originalDrawable = view.getBackground();
    final Drawable wrappedDrawable = DrawableCompat.wrap(originalDrawable);
    DrawableCompat.setTint(wrappedDrawable, Color.RED);
    setBackground(view,wrappedDrawable);

回答1:

Solution found by adding these lines to my theme:

    <item name="editTextStyle">@style/Base.V7.Widget.AppCompat.EditText</item>
    <item name="editTextBackground">@drawable/abc_edit_text_material</item>

回答2:

You should not change the background. It's better if you create a theme, and use theme colors (colorPrimary, colorAccent are the most important for widgets) to get the desired effect. Assign the theme to your EditText and enjoy. Note: you should use one of the AppCompat theme as base theme.

<style name="AppTheme.Base" parent="Theme.AppCompat.NoActionBar">
    <item name="colorPrimary">@color/primary</item>
    <item name="colorAccent">@color/accent</item>
</style>

and in your colors.xml

<color name="primary">#ff0000</color>
<color name="accent">#00ff00</color>

来源：https://stackoverflow.com/questions/31118289/appcompat-and-edittext-different-underline-on-different-api