我建议你为TextInputLayout做风格主题，只改变强调色。设置父主题为你的应用程序基础主题:

 <style name="MyTextInputLayout" parent="MyAppThemeBase">
     <item name="colorAccent">@color/colorPrimary</item>
 </style>

 <android.support.design.widget.TextInputLayout
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:theme="@style/MyTextInputLayout">

它为我工作..... 在TextInputLayout中添加提示颜色

    <android.support.design.widget.TextInputLayout
        android:textColorHint="#ffffff"
        android:id="@+id/input_layout_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <EditText
            android:id="@+id/edtTextPassword"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="15dp"
            android:hint="Password"
            android:inputType="textPassword"
            android:singleLine="true"
            />
    </android.support.design.widget.TextInputLayout>

我解决了问题。 这是布局:

 <android.support.design.widget.TextInputLayout
           android:id="@+id/til_username"
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:hint="@string/username"
           >

           <android.support.v7.widget.AppCompatEditText android:id="@+id/et_username"
               android:layout_width="match_parent"
               android:layout_height="wrap_content"
               android:singleLine="true"
               />
       </android.support.design.widget.TextInputLayout>

这就是风格:

<style name="AppBaseTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!--
            Theme customizations available in newer API levels can go in
            res/values-vXX/styles.xml, while customizations related to
            backward-compatibility can go here.
        -->
    </style>
<!-- Application theme. -->


 <style name="AppTheme" parent="AppBaseTheme">
        <!-- All customizations that are NOT specific to a particular API-level can go here. -->
        <item name="colorAccent">@color/pink</item>
        <item name="colorControlNormal">@color/purple</item>
        <item name="colorControlActivated">@color/yellow</item>
    </style>

你应该在应用程序中使用你的主题:

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

当您聚焦文本标签时，更改文本标签的颜色。也就是在里面打字。你必须加上specify

<item name="android:textColorPrimary">@color/yourcolorhere</item>

请注意: 您必须将所有这些实现添加到您的主题中。

我建议你为TextInputLayout做风格主题，只改变强调色。设置父主题为你的应用程序基础主题:

 <style name="MyTextInputLayout" parent="MyAppThemeBase">
     <item name="colorAccent">@color/colorPrimary</item>
 </style>

 <android.support.design.widget.TextInputLayout
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:theme="@style/MyTextInputLayout">

我如何改变浮动标签文本颜色?

使用材质组件库，您可以自定义TextInputLayout提示文本颜色使用(它需要版本1.1.0)

在布局中: app:hintTextColor属性:标签折叠和文本字段激活时的颜色 android:textColorHint属性:标签的颜色在所有其他文本字段的状态(如休息和禁用)

<com.google.android.material.textfield.TextInputLayout
     app:hintTextColor="@color/mycolor"
     android:textColorHint="@color/text_input_hint_selector"
     .../>

扩展材质样式Widget.MaterialComponents.TextInputLayout.*:

<style name="MyFilledBox" parent="Widget.MaterialComponents.TextInputLayout.FilledBox">
    <item name="hintTextColor">@color/mycolor</item>
    <item name="android:textColorHint">@color/text_input_hint_selector</item>
</style>

android:textColorHint的默认选择器是:

<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:alpha="0.38" android:color="?attr/colorOnSurface" android:state_enabled="false"/>
  <item android:alpha="0.6" android:color="?attr/colorOnSurface"/>
</selector>