我尝试使用android:textColorHint在android.support.design.widget. textinputlayout它工作得很好。

        <android.support.design.widget.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColorHint="@color/colorAccent">

            <EditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Hello"
                android:imeActionLabel="Hello"
                android:imeOptions="actionUnspecified"
                android:maxLines="1"
                android:singleLine="true"/>

        </android.support.design.widget.TextInputLayout>

找到答案，使用android.support.design:hintTextAppearance属性设置自己的浮动标签外观。

例子:

<android.support.design.widget.TextInputLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    app:hintTextAppearance="@style/TextAppearance.AppCompat">

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

我尝试使用android:textColorHint在android.support.design.widget. textinputlayout它工作得很好。

        <android.support.design.widget.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColorHint="@color/colorAccent">

            <EditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Hello"
                android:imeActionLabel="Hello"
                android:imeOptions="actionUnspecified"
                android:maxLines="1"
                android:singleLine="true"/>

        </android.support.design.widget.TextInputLayout>

试试下面的代码，它在正常状态下工作

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

 <android.support.v7.widget.AppCompatEditText
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:hint="Hiiiii"
     android:id="@+id/edit_id"/>


</android.support.design.widget.TextInputLayout>

在样式文件夹TextLabel代码

 <style name="TextLabel" parent="TextAppearance.AppCompat">
<!-- Hint color and label color in FALSE state -->
<item name="android:textColorHint">@color/Color Name</item> 
<item name="android:textSize">20sp</item>
<!-- Label color in TRUE state and bar color FALSE and TRUE State -->
<item name="colorAccent">@color/Color Name</item>
<item name="colorControlNormal">@color/Color Name</item>
<item name="colorControlActivated">@color/Color Name</item>
 </style>

而不是Brahmam Yamani的答案，我更喜欢使用Widget.Design.TextInputLayout作为父。这确保了所有必需的项都存在，即使不是所有项都被覆盖。在Yamanis的答案中，如果调用setErrorEnabled(true)，应用程序将崩溃与一个无法解析的资源。

简单地更改样式如下:

<style name="TextLabel" parent="Widget.Design.TextInputLayout">
    <!-- Hint color and label color in FALSE state -->
    <item name="android:textColorHint">@color/Color Name</item> 
    <item name="android:textSize">20sp</item>
    <!-- Label color in TRUE state and bar color FALSE and TRUE State -->
    <item name="colorAccent">@color/Color Name</item>
    <item name="colorControlNormal">@color/Color Name</item>
    <item name="colorControlActivated">@color/Color Name</item>
 </style>

<com.google.android.material.textfield.TextInputLayout
    android:hint="Hint"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/TextInputLayoutHint">

    <androidx.appcompat.widget.AppCompatEditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="text"
        android:maxLines="1"
        android:paddingTop="@dimen/_5sdp"
        android:paddingBottom="@dimen/_5sdp"
        android:textColor="#000000"
        android:textColorHint="#959aa6" />

</com.google.android.material.textfield.TextInputLayout>

res /价值/ styles.xml

<style name="TextInputLayoutHint" parent="">
    <item name="android:textColorHint">#545454</item>
    <item name="colorControlActivated">#2dbc99</item>
    <item name="android:textSize">11sp</item>
</style>