How to change text color of preference category in Android?

Actually just found out that preference category text using colorAccent.

If your app didn't using style of colorAccent, you can go to styles.xml and find
<item name="colorAccent">@color/colorPrimary</item>, and change the color as you want.

Using Material Theme, you just have to override the following property :

<style name="YourTheme" parent="@style/Theme.MaterialComponents">
    <item name="colorAccent">@color/your_custom_color</item>
</style>

Define your own PreferenceTheme and override colors.

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="preferenceTheme">@style/AppTheme.PreferenceTheme</item>
</style>

<style name="AppTheme.PreferenceTheme" parent="PreferenceThemeOverlay.v14.Material">
    <item name="colorAccent">`#color_value`</item>
</style>

Inspired by @AliSh answer, but I needed to only change the colour of one Preference text item. So, for all the Kotlin guys out there:

class TextColorPreference : Preference {

    constructor(context: Context) : super(context)

    constructor(context: Context, attrs: AttributeSet) : super(context, attrs)

    constructor(
        context: Context, attrs: AttributeSet,
        defStyle: Int
    ) : super(context, attrs, defStyle)

    override fun onBindViewHolder(holder: PreferenceViewHolder?) {
        super.onBindViewHolder(holder)

        context?.let {
            (holder?.findViewById(android.R.id.title) as? TextView)?.setTextColor(
                ContextCompat.getColor(
                    it,
                    R.color.colorPrimary
                )
            )
        }
    }
}

And then put it in your xml/prefs.xml:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

    <this.should.be.your.package.TextColorPreference
        android:id="@+id/settings_logout"
        android:key="@string/prefs_key_logout"
        android:title="@string/settings_logout" />
</PreferenceScreen>

For androidx preference library you can extend PreferenceCategory or Preference class like this:

class DangerPreference(
    context: Context?,
    attrs: AttributeSet?,
): Preference(context, attrs) {

    override fun onBindViewHolder(holder: PreferenceViewHolder?) {
        super.onBindViewHolder(holder)
        holder?.itemView?.findViewById<TextView>(android.R.id.title)?.setTextColor(Color.RED)
    }
}

then use it normally in your PreferenceScreen:

<com.github.anastr.myscore.util.pref.DangerPreference
    app:key="deleteServerData"
    app:title="@string/delete_server_data"
    app:iconSpaceReserved="false" />

A lot of the other answers didn't work for my case. I'm using a PreferenceFragmentCompat and I didn't want to have actual code doing this. So I simply made a copy of the preference category xml file and changed the textColor field. The file goes under the Apache license, Version 2.

<?xml version="1.0" encoding="utf-8"?>

<!--
  ~ Copyright (C) 2015 The Android Open Source Project
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License -->

  <LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="8dp"
    android:layout_marginTop="8dp"
    android:layout_marginStart="?android:attr/listPreferredItemPaddingLeft"
    android:orientation="vertical">
    <TextView
      android:id="@android:id/title"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_marginTop="16dp"
      android:paddingEnd="?android:attr/listPreferredItemPaddingRight"
      android:textAlignment="viewStart"
      android:textColor="@color/app_accent"
      android:textStyle="bold"
      tools:ignore="RtlSymmetry"/>
    <TextView
      android:id="@android:id/summary"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:ellipsize="end"
      android:singleLine="true"
      android:textColor="?android:attr/textColorSecondary"/>
  </LinearLayout>

And imported it in my .xml layout for the Preference fragment:

 <PreferenceCategory
    android:layout="@layout/preference_category_companion"
    android:key="my_preference_title"
    android:title="@string/my_preference_title">