change background color of Preference

I have a PreferenceCategory, xml file and I have defined all preferences in it, I call this from class that extends PreferenceActivity. I am unable to set the background of my settings screen, this screen is displayed with help of xml file shown below. Please see that I have already defined the android:background="#041A37", still the screen remains default color: black.

public class MyPreferenceActivity extends PreferenceActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        Context mContext=super.getBaseContext();
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.layout.preference);
        //v.setBackgroundColor(Color.rgb(4, 26, 55));
    }
}

---

preference.xml is

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
    android:background="#041A37" >

    <PreferenceCategory>
        <com.dropcall.SeekBarPreference
            android:background="#041A37"
            android:defaultValue="5"
            android:key="@string/Interference_Delay"
            android:progressDrawable="@drawable/seekbardrawable"
            android:title="Seconds Delay until intereference" />

        <com.dropcall.SeekBarPreference2
            android:defaultValue="30"
            android:key="@string/Drop_Delay"
            android:progressDrawable="@drawable/seekbardrawable"
            android:title="Seconds delay until drop" />

        <CheckBoxPreference
            android:background="@drawable/state_normal"
            android:defaultValue="true"
            android:key="@string/Drop_Option"
            android:title="Close after call drop" />
        <CheckBoxPreference
            android:background="@drawable/state_normal"
            android:defaultValue="true"
            android:key="@string/Timer_Option"
            android:title="Start timers on launch" />
    </PreferenceCategory>

</PreferenceScreen>

---

Although I have set android:background="#041A37" in every file, the background does开发者_StackOverflown't turn into navy blue, or any other color for that matter. It remains default color, black. How to change the background color. Please let me know any pointers / hints , if you had faced same issue let me know what changes you made to set the background color.

---

You can define a theme and then set this for your PreferenceActivity in the manifest. Your theme can then define a a background color or a windowBackground image should you prefer that.

Manifest:

    <activity android:label="@string/app_label" android:name=".client.PreferencesActivity"
        android:theme="@style/PreferencesTheme">
        <intent-filter>                                
        </intent-filter>
    </activity>

Then add the theme to your styles.xml

<style name="PreferencesTheme">
    <item name="android:windowBackground">@drawable/background_image</item>
    <item name="android:background">#FFEAEAEA</item>
</style>

In the above snippet there's both a background color and a background image defined to show how to do it.

---

This worked for me

getListView().setBackgroundColor(Color.TRANSPARENT);

getListView().setCacheColorHint(Color.TRANSPARENT);

getListView().setBackgroundColor(Color.rgb(4, 26, 55));

---

Another work-around as far as color goes is that you create a theme for the preferences activity and put the background color of list views as well:

<style name="PrefsTheme" parent="@android:style/Theme.Black.NoTitleBar">
    <item name="android:windowBackground">@color/prefs_bg</item>
    <item name="android:textColor">@color/text_color</item>
    <item name="android:listViewStyle">@style/listViewPrefs</item>
</style>

<style name="listViewPrefs" parent="@android:style/Widget.ListView">
    <item name="android:background">@color/prefs_bg</item>
    <item name="android:cacheColorHint">@color/prefs_bg</item>
</style>

---

android:background is not an available attribute, according to the documentation.

It is possible you could theme the PreferenceActivity to achieve your color change, though I have not tried this, because I want my preferences to look like those of the rest of Android, to improve usability of the app.

---

Or you can also make drawable as your background:

getListView().setBackgroundDrawable(getResources().getDrawable(R.drawable.bluegradient));

Note: setBackgroundDrawable() is deprecated. Use setBackground() instead.

getListView().setBackground(getResources().getDrawable(R.drawable.bluegradient));

---

I faced with the same requirement (Androidx Preference Screen background for settings fragment).

The below code has worked for me in a fragment. (in themes.xml). I assume that it is gonna work also for an activity.

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <style name="Theme.MyApplication" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
        ...............
       <!-- Add below -->
        <item name="preferenceTheme">@style/preference</item>
    </style>
    
    <style name="preference" parent="Theme.AppCompat">
        <item name="android:background">@color/purple_200</item>
    </style>
</resources>

---

Please specify a linear layout with a textview attached and specify background color and attach this xml to preferencecategory using the layout property.

<PreferenceCategory
     android:layout="@layout/preftitle"
 >

Where preftitle is an xml which has a linear layout and text view attached.

---

Go to res>values>styles.xml> and add this code to your <style > </style> the style should must be app base theme in this @color/activ is color resources added to colors.

<style name="app_theme" parent="@android:style/Theme">
    <item name="android:windowBackground">@color/activ</item>
    <item name="android:windowContentOverlay">@drawable/title_bar_shadow</item>
    <item name="android:listViewStyle">@style/TransparentListView</item>
</style>

if you use app_theme name of style tag then add like this to your manifest

<application
    android:name=".XXXXXX"
    android:allowBackup="true"

    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/app_theme" > //here

If you only want to change your background

---

I am using the PreferenceFragmentCompat, the below solution worked for me.

SettingsScreen

import android.os.Bundle
import android.util.TypedValue
import android.view.View
import androidx.annotation.ColorInt
import androidx.preference.ListPreference
import androidx.preference.Preference
import androidx.preference.PreferenceFragmentCompat
import com.almarai.easypick.R


class SettingsScreen : PreferenceFragmentCompat(), 
Preference.OnPreferenceChangeListener {

override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {

//Providing the XML file for the view to be created
setPreferencesFromResource(R.xml.app_settings_preferences, rootKey)
}

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {

//Get the Theme specific color
val typedValue = TypedValue()
val theme = requireContext().theme

/*R.attr.colorBackgroundScreenBody is my own attr from attrs.xml file, 
you can directly use R.color.red - Or any color from your colors.xml 
file if you do not have multi-theme app.*/
theme.resolveAttribute(R.attr.colorBackgroundScreenBody, typedValue, true)
@ColorInt val color = typedValue.data

view.setBackgroundColor(color)

super.onViewCreated(view, savedInstanceState)
}
}