в навигационном ящике получение данных из базы данных sqlite занимает некоторое время

Question

В панели навигации, когда я щелкаю один из списков, я попадаю во фрагмент, где есть recyclerview. Когда у меня было небольшое количество данных, щелкните один из списка. он сразу переводит меня к списку фрагментов, но когда у меня есть большой объем данных и я щелкаю по нему, панель навигации не перемещается, она приостанавливается и внезапно открывается и показывает данные. Я хотел бы знать, почему он останавливается и не двигается. и я хотел бы отображать загружаемое изображение, когда я щелкаю список панели навигации. Когда я работаю с firebase, я помещаю изображение загрузки предупреждения прямо перед addvalueevent, но sqlite, я не уверен, куда его поместить. Любая помощь будет принята с благодарностью.

package com.donghyouny.biblecard;

import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.view.Menu;

import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.android.material.snackbar.Snackbar;
import com.google.android.material.navigation.NavigationView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.core.view.GravityCompat;
import androidx.fragment.app.Fragment;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;

import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, FragmentCallback {

    Toolbar toolbar;
    CardFragment cardFargment;
    private AppBarConfiguration mAppBarConfiguration;


    @SuppressLint("SourceLockedOrientationActivity")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

        setContentView(R.layout.activity_main);

        // mAuth = FirebaseAuth.getInstance();
        toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        contextOfApplication = getApplicationContext();
        toolbar.setTitle("draw card");
        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.addDrawerListener(toggle);
        toggle.syncState();
        drawer.openDrawer(GravityCompat.START);
        cardFargment = new CardFragment();
        NavigationView navigationView = findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
        getSupportFragmentManager().beginTransaction().add(R.id.container, cardFargment).commit();
    }






    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
        Bundle bundle = getBundle(menuItem);
        //  onFragmentSelected(0, bundle);
        int id = menuItem.getItemId();
        if(id == R.id.menu1){

            onFragmentSelected(0, bundle);
        }else if(id == R.id.menu2){

            onFragmentSelected(1, bundle);
        }else if(id == R.id.menu3) {

            onFragmentSelected(2, bundle);
        }else if(id == R.id.menu4) {
            onFragmentSelected(3, bundle);
        }else if(id == R.id.menu5) {

            onFragmentSelected(4, bundle);
        }else if(id == R.id.menu6) {

            onFragmentSelected(5, bundle);
        }else if(id == R.id.menu7) {

            onFragmentSelected(6, bundle);
        }else if(id == R.id.menu8) {

            onFragmentSelected(7, bundle);
        }else if(id == R.id.menu9) {

            onFragmentSelected(8, bundle);
        }else if(id == R.id.menu10) {

            onFragmentSelected(9, bundle);
        }else if(id == R.id.menu11) {

            onFragmentSelected(10, bundle);
        }else if(id == R.id.menu12) {

            onFragmentSelected(11, bundle);
        }else if(id == R.id.menu13) {

            onFragmentSelected(12, bundle);
        }else if(id == R.id.menu14) {

            onFragmentSelected(13, bundle);
        }else if(id == R.id.menu15) {

            onFragmentSelected(14, bundle);
        }else if(id == R.id.menu16) {

            onFragmentSelected(15, bundle);
        }
        DrawerLayout drawer = findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }

    private Bundle getBundle(@NonNull MenuItem menuItem) {
        Bundle bundle = new Bundle();
        bundle.putString("value", menuItem.getTitle().toString());
        return bundle;
    }


    @Override
    public void onFragmentSelected(int position, Bundle bundle) {
        String value = bundle.getString("value");
        Fragment curFragment = null;
        if(position == 0){
            curFragment = new CardFragment();
            toolbar.setTitle(value);

        }else if(position>=1){
            curFragment = new Fragment1(value);
            toolbar.setTitle(value);

        }

        toolbar.setTitle(value);
        getSupportFragmentManager().beginTransaction().replace(R.id.container, curFragment).commit();
    }

    // a static variable to get a reference of our application context
    public static Context contextOfApplication;
    public static Context getContextOfApplication()
    {
        return contextOfApplication;
    }
}

package com.donghyouny.biblecard;

import android.content.Intent;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentTransaction;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;


import com.google.android.gms.ads.AdListener;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.InterstitialAd;

import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collections;

import static com.donghyouny.biblecard.SplashActivity.ROOT_DIR;


public class Fragment1 extends Fragment {

    public static final String VERSE_DATA = "data";
    public static final int REQUEST_CODE = 101;
    private RecyclerView recyclerView;
    private BibleAdapter adapter;
    private LinearLayoutManager mLayoutManager; //for sorting
    private ArrayList<Bible> bList = new ArrayList<>();
    private Connection conn;
    private Statement stmt;
    private ResultSet rs, rs2;
    private Bible bible;
    private String value;
    private InterstitialAd mInterstitialAd;
    private AlertDialog a;
    public Fragment1(String value) {
        this.value = value;
    }
    public Fragment1(){

    }
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

        final ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_1, container, false);
        mInterstitialAd = new InterstitialAd(getContext());
        mInterstitialAd.setAdUnitId("ca-app-pub-3940256099942544/1033173712");
        mInterstitialAd.loadAd(new AdRequest.Builder().build());
        conn = Utiles.dbConnection();
       /* String dbName = "bible.db";
        Connection conn=null;
        try {
            DriverManager.registerDriver((Driver) Class.forName("org.sqldroid.SQLDroidDriver").newInstance());
            String dbURL = "jdbc:sqldroid:" + ROOT_DIR + "/" + dbName;
            Log.d("url", dbURL);
            conn = DriverManager.getConnection(dbURL);

        }catch (Exception e){
            e.printStackTrace();
        }*/

        try {
            a = Utiles.createLoadingDialog(getActivity(), "Loading..");
            stmt = conn.createStatement();
            rs = stmt.executeQuery("select Id,BibleType, Verse, Content, Num, CNum, CheckNum, Image, datetime(TimeStamp) as MyDate  from bible where CNum=" + "(select Id from category where CategoryName='" + value + "') order by TimeStamp asc");
            while (rs.next()) {
                    bible = new Bible();
                    bible.setId(Integer.valueOf(rs.getString("Id")));
                    Log.d("bibleType",rs.getString("BibleType"));
                    bible.setBibleType(rs.getString("BibleType"));
                    Log.d("Verse", rs.getString("Verse"));
                    bible.setVerse(rs.getString("Verse"));
                    Log.d("Content", rs.getString("Content"));
                    bible.setContent(rs.getString("Content"));
                    bible.setNum(Integer.valueOf(rs.getString("Num")));
                    bible.setCnum(Integer.valueOf(rs.getString("CNum")));
                    bible.setCheckNum(Integer.valueOf(rs.getString("CheckNum")));
                    bible.setImage(rs.getBytes("Image"));
                    Log.d("TimeStamp", String.valueOf(rs.getLong("MyDate")));
                    bible.setTimestamp(rs.getString("MyDate"));
                    Log.d("bible", bible.toString());
                    bList.add(bible);

            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        Log.d("blist", bList.toString());
        recyclerView = rootView.findViewById(R.id.recyclerView);
        //recyclerView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(getContext());
        recyclerView.setLayoutManager(mLayoutManager);
        adapter = new BibleAdapter(bList, getContext());
        recyclerView.setAdapter(adapter);
        adapter.notifyDataSetChanged();

        a.dismiss();
        adapter.setOnItemClickListener(new OnVerseItemClickListener() {

                    @Override
                    public void onItemClick(BibleAdapter.BibleViewHolder holder, View view, final int position) {     //Toast.makeText(getContext(), "num"+adapter.getItemCount(), Toast.LENGTH_LONG).show();

                        if(mInterstitialAd.isLoaded()) {
                            // Step 1: Display the interstitial
                            mInterstitialAd.show();
                            // Step 2: Attach an AdListener
                            mInterstitialAd.setAdListener(new AdListener() {
                                @Override
                                public void onAdClosed() {

                                    Intent intent = new Intent(getContext(), VerseActivity.class);
                                    Log.d("bible33", bList.get(position).toString());
                                    intent.putExtra("bible", bList.get(position));
                                    intent.putExtra("category", value);
                                    Log.d("bibleIntent", bible.toString());

                                    startActivityForResult(intent, 1);
                                }
                            });
                        }else{
                            Intent intent = new Intent(getContext(), VerseActivity.class);
                            Log.d("bible33", bList.get(position).toString());
                            intent.putExtra("bible", bList.get(position));
                            intent.putExtra("category", value);
                            Log.d("bibleIntent", bible.toString());

                            startActivityForResult(intent, 1);
                        }


                    }
        });


        setHasOptionsMenu(true);
        return rootView;
    }


    @Override
    public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == 1){

            getActivity().recreate();
            /*Intent intent = getActivity().getIntent();
            getActivity().finish();
            startActivity(intent);*/
        }
    }

    @Override
    public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
        inflater.inflate(R.menu.actionbar_actions, menu);
    }


    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {

        switch (item.getItemId()) {
            case R.id.save_folder:

                Intent intent = new Intent(getContext(), SaveActivity.class);
                startActivityForResult(intent, REQUEST_CODE);
                return true;


        }
        return super.onOptionsItemSelected(item);
    }


}

public class Utiles {



    public static AlertDialog createLoadingDialog(Context context, String text) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        View view = LayoutInflater.from(context).inflate(R.layout.loading, null);
        TextView tx = view.findViewById(R.id.loading_text);
        tx.setText(text);
        builder.setView(view);
        AlertDialog dialog = builder.create();
        dialog.setCanceledOnTouchOutside(false);
        dialog.setCancelable(false);
        dialog.show();
        return dialog;
    }