Change android EditText style from rectangular border to underscore

问题

In one of my activities, my EditText views used to look like this

But now they looks like this

I need help changing it back: from the rectangle to the underscore.

BACKGROUND

Because I needed to create a custom ActionBar, I had to change the theme of the activity in question, YesterdayActivity, using the following

Style:

<style name="CustomWindowTitleBackground">
        <item name="android:background">#323331</item>
    </style>

    <style name="CustomTheme" parent="android:Theme">
        <item name="android:windowTitleSize">40dip</item>
        <item name="android:windowTitleBackgroundStyle">@style/CustomWindowTitleBackground</item>
    </style>

Manifest:

  <activity
        android:name="com.example.YesterdayActivity"
        android:theme="@style/CustomTheme">
    </activity>

onCreate:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
        setContentView(R.layout.activity_yesterday);
        getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.yesterday_title_bar);
…
}

回答1:

Change your custom theme like this

<style name="CustomTheme" parent="android:Theme.Holo.NoActionBar">

because you are not using old android theme not HoLo which has that kinda editTextView

In newer versions of Android, the framework will use the Window.FEATURE_ACTION_BAR feature whenever the Holo theme is selected. The framework throws the exception whenever an app calls setFeatureInt(Window.FEATURE_CUSTOM_TITLE) and FEATURE_ACTION_BAR has already been set. it crashed because Holo uses the ActionBar by default. The fix was simple. Turn the ActionBar off when using Holo

回答2:

Remove this line from your style

<item name="android:background">#323331</item>

because it is the background attribute that reflects the behaviour.

回答3:

There are two ways to achieve this. First method by changing theme of your application

first method:

AndroidManifest.xml

See android:theme

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    ...
    ...
    </application>

res/values/style.xml

Theme.AppCompat.Light.DarkActionBar makes underlined EditText

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

Just use EditText in same way

<EditText
      android:layout_width="match_parent"
      android:layout_height="48dp"
      android:hint="Email Address"
      android:inputType="textMultiLine"
      android:textSize="16dp" />

Second method:

Create a shape drawable with bottom stroke and set it as background of EditText

create a drawable file called res/drawable/stroked_edittext_bg.xml said in the below link:

How To Create An Android Shape With Bottom Stroke

<EditText
      android:layout_width="match_parent"
      android:layout_height="48dp"
      android:background="@drawable/stroked_edittext_bg"
      android:hint="Email Address"
      android:inputType="textMultiLine"
      android:textSize="16dp" />

回答4:

it can be achieve, if you change the theme for editText.

<EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:text="Name"
        android:theme="@android:style/Theme.Holo"
        android:ems="10"
        android:id="@+id/editText"
        android:layout_below="@+id/textView"
        android:layout_centerHorizontal="true" />

回答5:

<item name="android:windowTitleBackgroundStyle">@style/CustomWindowTitleBackground</item>

Change back it to your default style. Or remove this line from code.

Cause the 1st image you shared that is a default Editext background.

来源：https://stackoverflow.com/questions/17607173/change-android-edittext-style-from-rectangular-border-to-underscore