Send broadcast when default dialer changes

import android.content.Context;

import android.os.UserManager;

import android.telecom.DefaultDialerManager;

import android.telecom.TelecomManager;

import android.telephony.TelephonyManager;

import android.text.TextUtils;

import android.util.AttributeSet;

import java.util.Objects;

public class DefaultPhonePreference extends AppListPreference {

    private final Context mContext;

    public DefaultPhonePreference(Context context, AttributeSet attrs) {

        super(context, attrs);

        mContext = context.getApplicationContext();

        if (isAvailable(context)) {

            loadDialerApps();

        }

    @Override

    protected boolean persistString(String value) {

        if (!TextUtils.isEmpty(value) && !Objects.equals(value, getDefaultPackage())) {

            DefaultDialerManager.setDefaultDialerApplication(getContext(), value);

            TelecomManager.from(mContext).setDefaultDialer(value);

        }

        setSummary(getEntry());

        return true;