display alert dialog when switch ota server

    <string name="security_settings_fingerprint_enroll_find_sensor_message_cm" product="default">Locate the fingerprint sensor on the <xliff:g id="sensor_location">%1$s</xliff:g> of your phone.</string>

    <!-- OTA server change -->

    <string name="title_ota_server">Use staging OTA server</string>

    <string name="use_ota_summary">Change to OTA/Production server</string>

    <string name="title_ota_server">Connect to /e/OS test channel</string>

    <string name="use_ota_summary">Access test releases of /e/OS</string>

    <string name="use_ota_staging_popup_title">You are about to connect to /e/OS test channel</string>

    <string name="use_ota_staging_popup_message">It will allow you to download and install test versions of /e/OS. Those builds may be unstable, and should be used only for test purposes. Please accept only if you know what you are doing.</string>

    <!-- Device Info screen. /e/ legal. -->

    <string name="elicense_title">/e/ legal</string>

package com.android.settings.development;

import android.app.AlertDialog;

import android.content.Context;

import android.provider.Settings;

import androidx.annotation.VisibleForTesting;

import androidx.preference.Preference;

import androidx.preference.SwitchPreference;

import android.content.ContentValues;

import android.content.Context;

import android.content.DialogInterface;

import android.database.Cursor;

import android.net.Uri;

import com.android.settings.core.PreferenceControllerMixin;

import com.android.settings.R;

import com.android.settingslib.development.DeveloperOptionsPreferenceController;

public class ChangeSourcePreferenceController extends DeveloperOptionsPreferenceController implements

        Preference.OnPreferenceChangeListener, PreferenceControllerMixin {

        return CHANGE_URL_KEY;

    }

    @Override

    public boolean onPreferenceChange(Preference preference, Object newValue) {

        final boolean isEnabled = (Boolean) newValue;

        ((SwitchPreference) mPreference).setChecked(isEnabled);

   public void updateOtaServer(){

        if (count(OTAProvider.CONTENT_URI)) {

            ContentValues values = new ContentValues();

            values.put(OTAProvider.Status,"true");

            mContext.getContentResolver().insert(OTAProvider.CONTENT_URI, values);

        }

   }

    @Override

    public boolean onPreferenceChange(Preference preference, Object newValue) {

        final boolean isEnabled = (Boolean) newValue;

        ((SwitchPreference) mPreference).setChecked(isEnabled);

        if(retrieveStatus().equals("true")){

            updateOtaServer();

            return true;

        }

        new AlertDialog.Builder(mContext).

            setTitle(R.string.use_ota_staging_popup_title)

            .setMessage(mContext.getResources().getString(R.string.use_ota_staging_popup_message))

            .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener()

            {

                public void onClick(DialogInterface dialog, int which) {

                    ((SwitchPreference) mPreference).setChecked(true);

                    updateOtaServer();

                }

            }) .setNegativeButton(android.R.string.cancel, new DialogInterface.OnClickListener()

            {

                public void onClick(DialogInterface dialog, int which) {

                    ((SwitchPreference) mPreference).setChecked(false);

                }

            }).show();

        return false;

    }

    @Override

    public void updateState(Preference preference) {