EditTextPreference - only numeric value inputType - isn't working

android:digits="0123456789"

use this in edittext as it accepts only defined numbers. if its not working then use Android-Support-Preference-V7-Fix library.

Fixed EditTextPreference forwards the XML attributes (like inputType) to the EditText, just like the original preference did.

The Customize your settings section in the developer guide for settings recommends that you set the input type programmatically by using an OnBindEditTextListener as follows:

public class SettingsFragment extends PreferenceFragmentCompat {
    @Override
    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
        setPreferencesFromResource(R.xml.settings_screen, rootKey);

        EditTextPreference weeklyGoalPref = findPreference("weekly_goal");
        if (weeklyGoalPref != null) {
            weeklyGoalPref.setOnBindEditTextListener(new EditTextPreference.OnBindEditTextListener() {
                @Override
                public void onBindEditText(@NonNull EditText editText) {
                    editText.setInputType(InputType.TYPE_CLASS_NUMBER);
                }
            });
        }
    }
}

I tried defining the input type as "number" in xml and still got the normal keyboard with letters. This approach worked for me.

I agree that original support preferences has some issues, but for resolving this issue we just need add custom layout and specify EditText with android:inputType="number"

<android.support.v7.preference.EditTextPreference
            android:dialogLayout="@layout/preference_dialog_edittext_custom"

So that you may copy original preference_dialog_layout.xml file and edit it.

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="48dp"
    android:layout_marginBottom="48dp"
    android:overScrollMode="ifContentScrolls">

  <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_marginStart="24dp"
      android:layout_marginEnd="24dp"
      android:orientation="vertical">

    <TextView android:id="@android:id/message"
        style="?android:attr/textAppearanceSmall"
        android:layout_marginBottom="48dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textColor="?android:attr/textColorSecondary" />

    <EditText
        android:id="@android:id/edit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:layout_marginStart="-4dp"
        android:layout_marginEnd="-4dp" />

  </LinearLayout>

</ScrollView>