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Android Studio: How to create a counter by Button click in a widget?

How can i save the value in the Counter? If i start my Code, then the button is working, but it will reset to zero, so if i click the "+" Button, so it is always by 1. And when i click the "-" Button, then the count is by "-1". It does not go upper or lower. And every 24h i want a reset to zero. Can someone help me?

Code:

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.widget.RemoteViews;

import java.lang.reflect.Type;

public class Water extends AppWidgetProvider {

    private static final String MyOnClickPlus = "Plus";
    private static final String MyOnClickMinus = "Minus";
    int sum = 0;

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.water);
        views.setOnClickPendingIntent(R.id.btnplus, getPendingSelfIntent(context, MyOnClickPlus));
        views.setOnClickPendingIntent(R.id.btnminus, getPendingSelfIntent(context, MyOnClickMinus));


        appWidgetManager.updateAppWidget(appWidgetIds, views);
        super.onUpdate(context, appWidgetManager, appWidgetIds);
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.water);

        if(intent.getAction().toString() == MyOnClickPlus){
            sum += 1;
            views.setTextViewText(R.id.mengeheute, Integer.toString(sum));
        }
        else if(intent.getAction().toString() == MyOnClickMinus) {
            sum -= 1;
            views.setTextViewText(R.id.mengeheute, Integer.toString(sum));
        }
        updateWidget(context, views);
        super.onReceive(context, intent);
    }

    protected static PendingIntent getPendingSelfIntent(Context context, String action) {
        Intent intent = new Intent(context, Water.class);
        intent.setAction(action);
        return PendingIntent.getBroadcast(context, 0, intent, 0);
    }

    void updateWidget(Context context, RemoteViews remoteViews){
        ComponentName widgetComponent = new ComponentName(context, Water.class);
        AppWidgetManager.getInstance(context).updateAppWidget(widgetComponent, remoteViews);
    }
 

AndroidManifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.water">

    <application
        android:allowBackup="true"
        android:icon="@drawable/drinkwater"
        android:label="@string/app_name"
        android:roundIcon="@drawable/drinkwater"
        android:supportsRtl="true"
        android:theme="@style/Theme.Water">

        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver
            android:name=".Water"
            android:exported="true">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />

            </intent-filter>

            <meta-data
                android:name="android.appwidget.provider"
                android:resource="@xml/water_info" />
        </receiver>
    </application>

</manifest>