NumberPickerPreference

Prerequisites

Add this in your root build.gradle file (not your module build.gradle file):

allprojects {
    repositories {
        ...
        maven { url "https://jitpack.io" }
    }
}

Dependency

Add this to your module's build.gradle file (make sure the version matches the JitPack badge above):

dependencies {
    ...
    implementation 'com.github.invissvenska:NumberPickerPreference:VERSION'
}

Configuration

Add the NumberDialogPreference to the preferences.xml:

<nl.invissvenska.numberpickerpreference.NumberDialogPreference
    android:key="preference_key"
    android:title="Preference title"
    app:numberPickerPreference_minValue="10"
    app:numberPickerPreference_maxValue="60"
    app:numberPickerPreference_unitText=" another quantity" /> 

Usage

Override the OnDisplayPreferenceDialog method in your fragment which extends the PreferenceFragmentCompat class:

public class SettingsFragment extends PreferenceFragmentCompat {

    private static final String DIALOG_FRAGMENT_TAG = "CustomPreferenceDialog";
    
    // some other code

    @Override
    public void onDisplayPreferenceDialog(Preference preference) {
        if (preference instanceof NumberDialogPreference) {
            NumberDialogPreference dialogPreference = (NumberDialogPreference) preference;
            DialogFragment dialogFragment = NumberPickerPreferenceDialogFragment
                    .newInstance(
                            dialogPreference.getKey(),
                            dialogPreference.getMinValue(),
                            dialogPreference.getMaxValue(),
                            dialogPreference.getStepValue(),
                            dialogPreference.getUnitText()
                    );
            dialogFragment.setTargetFragment(this, 0);
            dialogFragment.show(getParentFragmentManager(), DIALOG_FRAGMENT_TAG);
        } else {
            super.onDisplayPreferenceDialog(preference);
        }
    }
}

To create a NumberPickerPreference with default value of 20, min value of 10, max value of 60, increments of 2 and custom unit text:

<nl.invissvenska.numberpickerpreference.NumberDialogPreference
    android:key="preference_key"
    android:title="Preference title"
    app:defaultValue="20"
    app:numberPickerPreference_minValue="10"
    app:numberPickerPreference_maxValue="60"
    app:numberPickerPreference_stepValue="2"
    app:numberPickerPreference_unitText=" another quantity" />

NumberDialogPreference Attributes

Attributes	Type	Default	Mandatory	Description
defaultValue	Integer	0	No	Sets the default value of the preference.
numberPickerPreference_minValue	Integer	0	No	Minimum value to select from preference.
numberPickerPreference_maxValue	Integer	100	No	Maximum value to select from preference.
numberPickerPreference_stepValue	Integer	1	No	Stepper value, minimum value should be 1.
numberPickerPreference_unitText	String	none	No	Suffix value, can be used to indicate the unit which will be selected.

Screenshots

Please click the image below to enlarge.