updating recycler view items from a different activity

See also questions close to this topic

• Create view with transparent circle

  I want to create a view with rounded corners and a centered round button. At the moment i am using a rectangle shape with round borders as a view-background (green part) and a white circle shape, which contains the button (green button with android logo).

  This works fine as long as the background (yellow/brown at the moment, just for better visualization) has the same color as the circle shape.

  But now i want to use a gradient background: What is a smart way to achieve the same look with a transparent circle?

  I wasn't able to create the same look with normal android shapes (i had the idea of round corners).

  
• NFC Detection in and Out of Application in Android

  My application was only catch nfc tag while my app is working. I wanted to add a feature that it can catch NFC tag when my app is closed. I can do that by using intent-filter.

  If my app is closed and I try to readout nfc tag, it asks me which app I should choose to open. Its normal. But now in my app (I have a button to start nfc communication), the app selector appears which I do not want.

  My purpose is that: do not ask me which app I use while my app is working. it can ask when my app is closed.

  Here is my intentfilter

  [IntentFilter(
          new[] { NfcAdapter.ActionTechDiscovered
  },
          Categories = new[] { Android.Content.Intent.CategoryDefault }
      )]
      [MetaData(NfcAdapter.ActionTechDiscovered, Resource = "@xml/rfid_type_list")]
  

  my rfid_type_list

  <?xml version="1.0" encoding="utf-8" ?>
  <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
    <!-- capture anything using NfcF -->
    <tech-list>
      <tech>android.nfc.tech.NfcA</tech>
    </tech-list>
  </resources>
  

  How to force that nfc has to be opened by my app instead of asking when my app is working.

  hope its clear.
• Jetpack Navigation and Search Bar (Kotlin)

  I have an activity with a fragment container inside. I'm using Jetpack Navigation to manage almost 100 fragments ! I'm using buttons for navigation but I want to add a searchBar. I associated keywords to each fragments so when the research is done I just want to go on the fragment I found.

  The searchBar is on the activity.. So I need to be able to search from every fragment to go on every other fragments...

  There are therefore 10,000 (100 * 100) combinations, I'm not going to create each of them...

  Do you have an idea to do it easily ?

  Thanks in advance, Sorry for my bad english, Thomas
• MS Access Multiple value from a FORM into table as a Single Line

  To avoid Multiple Value fields, I need some help to configure the "multi-select" option of a FORM within MS Access to a SINGLE line/field.

  Example:

  

  And in the Table it should come out like one single line/field

  Example

  

  Is this even possible? if Show can someone help me?
• Website connected to local database, how to make it remote access?

  I have created a website that is hosted. The database it uses is connected locally. I created the database in MySQL workbench. How can I "host" this database remotely so that when using the website it can be accessed from any machine? Thanks
• Merging columns with a key that tells which column should be prioritized based on suffix R

  I have the following dataframe:

  set.seed(123)
      df <- data.frame(col.dfA=rnorm(8,40,2),
                       col.dfB=rnorm(8,20,2),
                       colt=rnorm(8,100,20),
                       pr.dfA=rnorm(8,20,2),
                       pr.dfB=rnorm(8,30,2),
                       priority=c("dfA","dfB","dfA","dfA","dfB","dfA","dfB","dfB"))
  

  Now I would like to merge col.dfA&col.dfB and pr.dfA&pr.dfBinto df$col and df$pr respectively. The df$priority column gives indication which column values should be used in each row. Ie. in the 1st, 3rd, 4th and 6th rows, columns with suffix dfA should be prioritised. In remaining rows columns with suffix dfB should be prioritised. The solution needs to be applicable for larger scenarios with dozens of columns and hundreds of rows.

  Initial dataframe:

     col.dfA  col.dfB      colt   pr.dfA   pr.dfB priority
  1 38.87905 18.62629 109.95701 18.74992 31.79025      dfA
  2 39.53965 19.10868  60.66766 16.62661 31.75627      dfB
  3 43.11742 22.44816 114.02712 21.67557 31.64316      dfA
  4 40.14102 20.71963  90.54417 20.30675 31.37728      dfA
  5 40.25858 20.80154  78.64353 17.72373 31.10784      dfB
  6 43.43013 20.22137  95.64050 22.50763 29.87618      dfA
  7 40.92183 18.88832  79.47991 20.85293 29.38807      dfB
  8 37.46988 23.57383  85.42218 19.40986 29.23906      dfB
  

  Expected result:

    col      colt      pr            priority
  1 38.87905 109.95701 18.74992      dfA
  2 19.10868  60.66766 31.75627      dfB
  3 43.11742 114.02712 21.67557      dfA
  4 40.14102  90.54417 20.30675      dfA
  5 20.80154  78.64353 31.10784      dfB
  6 43.43013  95.64050 22.50763      dfA
  7 18.88832  79.47991 29.38807      dfB
  8 23.57383  85.42218 29.23906      dfB
  
• How to reach perfect list performance like whatsapp using react native?

  I'm building a chat application, and I want my conversation screen to work like WhatsApp, You can scroll until infinity and will still feel smooth and fast.

  My problem is that when you have a collection of 1k-10k messages when I scroll I see blanks, etc.

  After some research I realized I probably need a different list than SectionList/FlatList.

  I need a list that has sections (to group messages by date), can be inverted and recycle it's child items views to be able to render items fast.

  I couldn't find any library that has all those 3 requirements I mentioned above, So I've come here, Have you ever encountered this kind of problem before, How did you solve it?

  I'm aware WhatsApp is not built with react native.
• Android Databinding not update UI immediately in RecyclerView

  I have a recyclerView and each list item view contains two views -

  • a text view to show some text from POJO using databinding lib and
  • a button when that button is clicked, it calls method from viewmodel.

  The viewmodel changes the text directly to the POJO. Every thing works fine except the recycler view needs to be refreshed to show changes.

  My POJO

  public class Post{
  private String title;
  ...getter and setter
  }
  

  Recycler Adatper is something like this.

  public class MyRecyclerAdapter extends RecyclerView.Adapter<PostRecyclerAdapter.MyViewHolder> {
  
  private List<Post> posts;
  ...
  class MyViewHolder extends RecyclerView.ViewHolder {
      private final ViewDataBinding binding;
  
      public MyViewHolder(ViewDataBinding binding) {
          super(binding.getRoot());
          this.binding = binding;
      }
  
      void bindView(int position) {
          Post post = posts.get(position);
          binding.setVariable(BR.post, post);
          binding.setVariable(BR.viewModel, myViewModel);
          binding.executePendingBindings();
  
      }
  }
  
  @Override
  public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
      LayoutInflater inflater = LayoutInflater.from(parent.getContext());
      ViewDataBinding binding = DataBindingUtil.inflate(inflater, R.layout.post_list_item, parent, false);
      return new MyViewHolder(binding);
  }
  
  @Override
  public void onBindViewHolder(MyViewHolder holder, int position) {
      holder.bindView(position);
  }
  ...
  }
  

  post_list_item.xml

  <layout xmlns:android="http://schemas.android.com/apk/res/android">
  <data>
      <variable
          name="post"
          type="....Post" />
      <variable
          name="viewModel"
          type="....MyViewModel"/>
  </data>
  <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="vertical">
  
      <TextView
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:text="@{post.title}" />
      <Button
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:onClickListener="@{()->viewModel.onButtonClicked(post)}"
  />
      </LinearLayout>
  

  and viewModel has this method.

  public class MyViewModel extends ViewModel {
   public void onButtonClicked(Post post) {
  post.setTitle("some text");
  }
  

  I think there is a way to change the UI immediately when the data in POJO is changed. But now I need to draw the recycler view off the screen or rotate the screen.
• Load Firebase Image as int

  I have a RecyclerView with a list of Card Views as usual. This time tho, I'd like to set an Image in the CardView from my Firebase storage, but I cannot understand the error.

  Here is the influenced Code:

  From the main Fragment:

  StorageReference mStorage= FirebaseStorage.getInstance().getReference().child("SliderGames/SlideCover2.jpg");
  
  ArrayList<GameItem> GameList = new ArrayList<>();
      GameList.add(new GameItem(Glide.with(this).load(mStorage).into(Cover), "SomeText"));
  

  The Item:

  package com.reogen.gametime.Items;
  
  public class GameItem {
  private int Cover;
  private String Title;
  private String Description;
  
  public GameItem(int CoverImage, String TextTitle, String TextDescription) {
      Cover = CoverImage;
      Title = TextTitle;
      Description = TextDescription;
  }
  
  public int getCover() {
      return Cover;
  }
  
  public String getTitle() {
      return Title;
  }
  
  public String getDescription() {
      return Description;
  }
  }
  

  and last the Adapter:

   public void onBindViewHolder(@NonNull GameViewHolder gameViewHolder, int position) {
      GameItem currentItem = mGameList.get(position);
      gameViewHolder.Cover.setImageResource(currentItem.getCover());
      gameViewHolder.Title.setText(currentItem.getTitle());
      gameViewHolder.Description.setText(currentItem.getDescription());
  
  }
  

  If using images from the drawable, everything goes fine, now that I have used glide in my Main fragment I get this error:

  GameItem() in GameItem cannot be applied to:
  Expected Parameters:
  Actual Arguments:
  
  CoverImage:
  int Glide...this).load(oStorage).into(Cover) 
  (com...android.graphics.drawable.Drawa 
  ble>)
  

  Since copy&pasting Android Studio error does'nt really make them understandable, here's a screen:

  
• Create single adapter for any type of List Android

  I am trying to create Generic Adapter in Android.

  I am succeeded in creating to the given level where I have to extend RecyclerBaseAdapter

  import kotlinx.android.synthetic.main.activity_animal_list.*
  
  class AnimalListActivity : AppCompatActivity() {
  
      private lateinit var animalAdapter: AnimalNewAdapter
      private val animalList = listOf(
          Animal("Monkey"), Animal("Dog"),
          Animal("Cat"), Animal("Chimpanzee"),
          Animal("Frog"), Animal("Elephant"),
          Animal("Cat"), Animal("Chimpanzee")
      )
  
      override fun onCreate(savedInstanceState: Bundle?) {
          super.onCreate(savedInstanceState)
          setContentView(R.layout.activity_animal_list)
  
          animalAdapter = AnimalNewAdapter(R.layout.item_animal,true,animalList, { position, view ->
              Toast.makeText(this@AnimalListActivity, "Clicked at :" + position, Toast.LENGTH_LONG).show()
          })
          recycler_view.apply {
              layoutManager = LinearLayoutManager(this@AnimalListActivity)
              adapter = animalAdapter
          }
      }
  }
  

  AnimalNewAdapter.kt

  import kotlinx.android.synthetic.main.item_animal.view.*
  
  class AnimalNewAdapter(
      layoutID: Int, clickable: Boolean, itemList: List<Animal>,
      onRecyclerItemClick: (position: Int, view: View) -> Unit
  ) :
      RecyclerBaseAdapter<Animal>(layoutID, clickable, itemList, onRecyclerItemClick) {
  
      override fun onBindViewHolder(holder: RecyclerBaseViewHolder, pos: Int) {
          holder.itemView.tv_animal.text = itemList.get(pos).title
      }
  }
  

  RecyclerBaseAdapter.kt

  abstract class RecyclerBaseAdapter<BO>(val layoutID: Int,val clickable:Boolean,val itemList: List<BO>, val onRecyclerItemClick: ((position: Int, view: View) -> Unit)
  ) : RecyclerView.Adapter<RecyclerBaseViewHolder>() {
  
      override fun onCreateViewHolder(parent: ViewGroup, position: Int): RecyclerBaseViewHolder {
          return RecyclerBaseViewHolder(parent,layoutID,clickable,onRecyclerItemClick)
      }
      override fun getItemCount(): Int {
          return itemList.size
      }
  }
  

  Is it possible to create an adapter without need of AnimalNewAdapter. like below

  animalAdapter = RecyclerBaseAdapter<Animal>(R.layout.item_animal,true,animalList, { position, view ->
              Toast.makeText(this@AnimalListActivity, "Clicked at :" + position, Toast.LENGTH_LONG).show()
  
              override fun onBindViewHolder(holder: RecyclerBaseViewHolder, pos: Int) {
                  holder.itemView.tv_animal.text = itemList.get(pos).title
              }
          })
  

  I want to remove this overhead to create a seperate adapter for each..
• Data Deleted From Recycler List But Not From Sqlite Database

  I am working on android application I which I am using Recycler Adapter and Sqlite database to delete and update the sqlite database.

  My Problem is when I Click on Item in Recycler view to delete It Deletes the data from list, But When I Click Back and open List Again The deleted data is still there.

  I have checked my database From device File Explorer That The Data does not deleted from database.

  Same thing happens with the Update

  Here is My Recycler Adapter Class

  public class UserRecyclerAdapterSavedUsers extends RecyclerView.Adapter<UserRecyclerAdapterSavedUsers.UserViewHolder> {
  
  private List<User> listUsers;
  Context mContext;
  RecyclerView mRecyclerView;
  ItemClickListenerLongPressed itemClickListenerLongPressed;
  UserRecyclerAdapterSavedUsers userRecyclerAdapterSavedUsers;
  View itemView;
  
  public UserRecyclerAdapterSavedUsers(List<User> listUsers,RecyclerView recyclerView) {
      this.listUsers = listUsers;
      mRecyclerView=recyclerView;
  }
  
  @Override
  public UserViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
      mContext= parent.getContext();
      itemView = LayoutInflater.from(parent.getContext())
              .inflate(R.layout.item_user_recycler_second, parent, false);
  
      return new UserViewHolder(itemView);
  }
  /**
   * ViewHolder class
   */
  public class UserViewHolder extends RecyclerView.ViewHolder {
  
      //public AppCompatTextView ID;
      public AppCompatTextView textViewID;
      public AppCompatTextView textViewName;
      public AppCompatTextView textViewPassword;
      public AppCompatTextView textViewRole;
      LinearLayout layout;
  
      public UserViewHolder(View view) {
          super(view);
  
          textViewID = (AppCompatTextView) view.findViewById(R.id.textViewID);
          textViewName = (AppCompatTextView) view.findViewById(R.id.textViewName);
          textViewPassword = (AppCompatTextView) view.findViewById(R.id.textViewPassword);
          textViewRole = (AppCompatTextView) view.findViewById(R.id.textViewRole);
          layout = (LinearLayout) view.findViewById(R.id.list_view);
      }
  }
  @Override
  public void onBindViewHolder(UserViewHolder holder, final int position) {
  
      holder.textViewID.setText(listUsers.get(position).getUserid());
      holder.textViewName.setText(listUsers.get(position).getName());
      holder.textViewPassword.setText(listUsers.get(position).getPassword());
      holder.textViewRole.setText(listUsers.get(position).getRole());
      holder.layout.setOnLongClickListener(new View.OnLongClickListener() {
          @Override
          public boolean onLongClick(View v) {
              displayingAlertDialog(position);
              return false;
          }
      });
  
  }
  
  public void setItemClickListenerLongPressed(ItemClickListenerLongPressed itemClickListenerLongPressed) {
      this.itemClickListenerLongPressed = itemClickListenerLongPressed;
  }
  
  @Override
  public int getItemCount() {
      Log.v(UsersRecyclerAdapter.class.getSimpleName(),""+listUsers.size());
      return listUsers.size();
  }
  
  private void displayingAlertDialog(final int position) {
      final User user= new User();
      //displaying alert dialog box
      AlertDialog.Builder builder = new AlertDialog.Builder(itemView.getContext());
      builder.setTitle("Choose Option");
      builder.setMessage("Update or Delete?");
      builder.setPositiveButton("Update", new DialogInterface.OnClickListener() {
          @Override
          public void onClick(DialogInterface dialog, int which) {
  
              //go to update activity
              gotupdateuserActivity(user.getUserid());
              // dialog.cancel();
  
          }
      });
      builder.setNeutralButton("Delete", new DialogInterface.OnClickListener() {
          @Override
          public void onClick(DialogInterface dialog, int which) {
              //go to Remove Item
              DatabaseHelper dbHelper = new DatabaseHelper(mContext);
              dbHelper.deletePersonRecord(user.getUserid(), mContext);
              listUsers.remove( position);
              notifyItemRemoved(position);
              mRecyclerView.removeViewAt(position);
              notifyItemRangeChanged(position, listUsers.size());
              notifyDataSetChanged();
              dialog.cancel();
  
          }
      });
      builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
          @Override
          public void onClick(DialogInterface dialog, int which) {
              dialog.dismiss();
          }
      });
      AlertDialog alert11 = builder.create();
      alert11.show();
  }
  public void remove(int position) {
      listUsers.remove(position);
      notifyItemRemoved(position);
  }
  
  private void gotupdateuserActivity(String userid) {
      Intent goToUpdate = new Intent(mContext, UpdateUserRec.class);
      goToUpdate.putExtra("USER_ID", userid);
      Toast.makeText(mContext, "USER REC", Toast.LENGTH_SHORT).show();
      mContext.startActivity(goToUpdate);
  }
  

  }

  Here is Sqlite Database Helper Class

  public class DatabaseHelper extends SQLiteOpenHelper {
  
  // Database Version
  private static final int DATABASE_VERSION = 2;
  Context context;
  
  // Database Name
  private static final String DATABASE_NAME = "DynamicERP.db";
  
  public  static final String table_imei = "IMEITABLE";
  public  static final String table_login= "USERLOGIN";
  
  // User Table Columns names
  
  public static final String imeiid = "IMEIID";
  public static final String imei = "IMEI";
  
  public static final String userid = "USERID";
  public static final String username = "USERNAME";
  public static final String password = "PASSWORD";
  public static final String userrole = "USERROLE";
  
  
  // create table sql query
  private static final String DATABASE_CIMEI = "CREATE TABLE " + table_imei + "("
          + imeiid + " INTEGER, " + imei + " VARCHAR );" ;
  
  private static final String DATABASE_CUSER = "CREATE TABLE " + table_login + "("
          + userid + " INTEGER, " + username + " VARCHAR, " + password + " INTEGER, " + userrole + " VARCHAR );" ;
  
  // drop table sql query
  private String DROP_IMEI_TABLE = "DROP TABLE IF EXISTS " + table_imei;
  private String DROP_USER_TABLE = "DROP TABLE IF EXISTS " + table_login;
  
  /**
   * Constructor
   *
   * @param context
   */
  public DatabaseHelper(Context context) {
      super(context, DATABASE_NAME, null, DATABASE_VERSION);
  }
  
  @Override
  public void onCreate(SQLiteDatabase db) {
      db.execSQL(DATABASE_CIMEI);
      db.execSQL(DATABASE_CUSER);
  }
  
  
  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
  
      //Drop User Table if exist
      db.execSQL(DROP_USER_TABLE);
  
      // Create tables again
      onCreate(db);
  
  }
  
  /**
   * This method is to create user record
   *
   * @param user
   */
  public void addUser(User user) {
      SQLiteDatabase db = this.getWritableDatabase();
  
      ContentValues values = new ContentValues();
      values.put(userid,user.getUserid());
      values.put(username, user.getName());
      values.put(password, user.getPassword());
      values.put(userrole, user.getRole());
  
      // Inserting Row
      db.insert(table_login, null, values);
      db.close();
  }
  
  public void addIMEI(User user) {
      SQLiteDatabase db = this.getWritableDatabase();
  
      ContentValues values = new ContentValues();
      values.put(imei,user.getImei());
      values.put(imeiid, user.getImeiid());
  
      // Inserting Row
      db.insert(table_imei, null, values);
      db.close();
  }
  
  /**
   * This method is to fetch all user and return the list of user records
   *
   * @return list
   */
  public List<User> getAllUser() {
      // array of columns to fetch
      String[] columns = {
              userid,
              username,
              password,
              userrole
      };
      // sorting orders
      String sortOrder =
              userid + " ASC";
      List<User> userList = new ArrayList<User>();
  
      SQLiteDatabase db = this.getReadableDatabase();
  
      // query the user table
      /**
       * Here query function is used to fetch records from user table this function works like we use sql query.
       * SQL query equivalent to this query function is
       * SELECT user_id,user_name,user_email,user_password FROM user ORDER BY user_name;
       */
      Cursor cursor = db.query(table_login, //Table to query
              columns,    //columns to return
              null,        //columns for the WHERE clause
              null,        //The values for the WHERE clause
              null,       //group the rows
              null,       //filter by row groups
              sortOrder); //The sort order
  
  
      // Traversing through all rows and adding to list
      if (cursor.moveToFirst()) {
          do {
              User user = new User();
              //user.setId(Integer.parseInt(cursor.getString(cursor.getColumnIndex(userid))));
              user.setUserid(cursor.getString(cursor.getColumnIndex(userid)));
              user.setName(cursor.getString(cursor.getColumnIndex(username)));
              user.setPassword(cursor.getString(cursor.getColumnIndex(password)));
              user.setRole(cursor.getString(cursor.getColumnIndex(userrole)));
              // Adding user record to list
              userList.add(user);
          } while (cursor.moveToNext());
      }
      cursor.close();
      db.close();
  
      // return user list
      return userList;
  }
  
  
  
  /**
   * This method is to fetch all user and return the list of user records
   *
   * @return list
   */
  public List<User> getAllImei() {
      // array of columns to fetch
      String[] columns = {
              imeiid,
              imei,
      };
      // sorting orders
      String sortOrder =
              imeiid + " ASC";
      List<User> userList = new ArrayList<User>();
  
      SQLiteDatabase db = this.getReadableDatabase();
  
      // query the user table
      /**
       * Here query function is used to fetch records from user table this function works like we use sql query.
       * SQL query equivalent to this query function is
       * SELECT user_id,user_name,user_email,user_password FROM user ORDER BY user_name;
       */
      Cursor cursor = db.query(table_imei, //Table to query
              columns,    //columns to return
              null,        //columns for the WHERE clause
              null,        //The values for the WHERE clause
              null,       //group the rows
              null,       //filter by row groups
              sortOrder); //The sort order
  
  
      // Traversing through all rows and adding to list
      if (cursor.moveToFirst()) {
          do {
              User user = new User();
              //user.setId(Integer.parseInt(cursor.getString(cursor.getColumnIndex(userid))));
              user.setImei(cursor.getString(cursor.getColumnIndex(imei)));
              user.setImeiid(cursor.getString(cursor.getColumnIndex(imeiid)));
              // Adding user record to list
              userList.add(user);
          } while (cursor.moveToNext());
      }
      cursor.close();
      db.close();
  
      // return user list
      return userList;
  }
  
  /**
   * This method to update user record
   *
   * @param receivedUSERId
   * @param updateUserRec
   * @param user
   */
  public void updateUser(String receivedUSERId, UpdateUserRec updateUserRec, User user) {
      SQLiteDatabase db = this.getWritableDatabase();
      String strSQL = "UPDATE "+table_login+ " SET "+username+" = "+user.getName()+"," +
              " "+password+" = "+user.getPassword()+","+userrole+" = "+user.getRole()+"" +
              " WHERE "+userid+" = "+receivedUSERId;
      db.execSQL(strSQL);
      db.close();
  }
  
  
  
  /**
   * This method is to delete user record
   *
   * @param user
   */
  public void deleteUser(User user) {
      SQLiteDatabase db = this.getWritableDatabase();
      // delete user record by id
      db.delete(table_login, userid + " = ?",
              new String[]{String.valueOf(user.getUserid())});
      db.close();
  }
  
  /**
   * This method to check user exist or not
   *
    @param userid
   * @return true/false
   */
  public boolean checkUser(String userid) {
  
      // array of columns to fetch
      String[] columns = {
              userid
      };
      SQLiteDatabase db = this.getReadableDatabase();
  
      // selection criteria
      String selection = userid + " = ?";
  
      // selection argument
      String[] selectionArgs = {userid};
  
      // query user table with condition
      /**
       * Here query function is used to fetch records from user table this function works like we use sql query.
       * SQL query equivalent to this query function is
       * SELECT user_id FROM user WHERE imei = 'dynamic@imei.com';
       */
      Cursor cursor = db.query(table_login, //Table to query
              columns,                    //columns to return
              selection,                  //columns for the WHERE clause
              selectionArgs,              //The values for the WHERE clause
              null,                       //group the rows
              null,                      //filter by row groups
              null);                      //The sort order
      int cursorCount = cursor.getCount();
      cursor.close();
      db.close();
  
      if (cursorCount > 0) {
          return true;
      }
  
      return false;
  }
  
  
  /**
   * This method to check user exist or not
   *
   * @param email
   * @param password
   * @return true/false
   */
  public boolean checkUser(String email, String password) {
  
      // array of columns to fetch
  
      String[] columns = {
              userid
      };
      SQLiteDatabase db = this.getReadableDatabase();
      // selection criteria
      String selection = userid + " = ?" + " AND " + password + " = ?";
  
      // selection arguments
      String[] selectionArgs = {email, password};
  
      // query user table with conditions
      /**
       * Here query function is used to fetch records from user table this function works like we use sql query.
       * SQL query equivalent to this query function is
       * SELECT user_id FROM user WHERE user_email = 'jack@androidtutorialshub.com' AND user_password = 'qwerty';
       */
      Cursor cursor = db.query(table_login, //Table to query
              columns,                    //columns to return
              selection,                  //columns for the WHERE clause
              selectionArgs,              //The values for the WHERE clause
              null,                       //group the rows
              null,                       //filter by row groups
              null);                      //The sort order
  
      int cursorCount = cursor.getCount();
  
      cursor.close();
      db.close();
      if (cursorCount > 0) {
          return true;
      }
  
      return false;
  }
  
  /**
   * This method to check user exist or not
   *
   * @param userid
   * @param username
   * @return true/false
   */
  public boolean checkUserData(String userid, String username) {
  
      // array of columns to fetch
  
      String[] columns = {
              userid
      };
      SQLiteDatabase db = this.getReadableDatabase();
      // selection criteria
      String selection = userid + " = ?" + " AND " + username + " = ?";
  
      // selection arguments
      String[] selectionArgs = {userid, username};
  
      // query user table with conditions
      /**
       * Here query function is used to fetch records from user table this function works like we use sql query.
       * SQL query equivalent to this query function is
       * SELECT user_id FROM user WHERE user_email = 'jack@androidtutorialshub.com' AND user_password = 'qwerty';
       */
      Cursor cursor = db.query(table_login, //Table to query
              columns,                    //columns to return
              selection,                  //columns for the WHERE clause
              selectionArgs,              //The values for the WHERE clause
              null,                       //group the rows
              null,                       //filter by row groups
              null);                      //The sort order
  
      int cursorCount = cursor.getCount();
  
      cursor.close();
      db.close();
      if (cursorCount > 0) {
          return true;
      }
  
      return false;
  }
  
  public boolean checkUserData(String userid) {
      // array of columns to fetch
      String[] columns = {
              userid
      };
      SQLiteDatabase db = this.getReadableDatabase();
  
      // selection criteria
      String selection = userid + " = ?";
  
      // selection argument
      String[] selectionArgs = {userid};
  
      // query user table with condition
      /**
       * Here query function is used to fetch records from user table this function works like we use sql query.
       * SQL query equivalent to this query function is
       * SELECT user_id FROM user WHERE user_email = 'dynamic@data.com';
       */
      Cursor cursor = db.query(table_login, //Table to query
              columns,                    //columns to return
              selection,                  //columns for the WHERE clause
              selectionArgs,              //The values for the WHERE clause
              null,                       //group the rows
              null,                      //filter by row groups
              null);                      //The sort order
      int cursorCount = cursor.getCount();
      cursor.close();
      db.close();
  
      if (cursorCount > 0) {
          return true;
      }
  
      return false;
  }
  
  public User getUser(String id){
      SQLiteDatabase db = this.getWritableDatabase();
      String query= "SELECT  * FROM "+table_login;
  
      Cursor cursor = db.rawQuery(query, null);
  
      User user = new User();
      if(cursor.getCount() > 0) {
          cursor.moveToFirst();
  
          user.setUserid(cursor.getString(cursor.getColumnIndex(userid)));
          user.setName(cursor.getString(cursor.getColumnIndex(username)));
          user.setPassword(cursor.getString(cursor.getColumnIndex(password)));
          user.setRole(cursor.getString(cursor.getColumnIndex(userrole)));
      }
      return user;
  
  }
  
  public void deletePersonRecord(String useridValue, Context mContext) {
      SQLiteDatabase db = this.getWritableDatabase();
      db.execSQL("DELETE FROM "+table_login+" WHERE "+userid +"='"+useridValue+"'");
      Toast.makeText(mContext, "Deleted successfully.", Toast.LENGTH_SHORT).show();
      db.close();
  }
  public void deleteIMEIRecord(String imeiidValue, Context mContext) {
      SQLiteDatabase db = this.getWritableDatabase();
      db.execSQL("DELETE FROM "+table_imei+" WHERE "+imeiid +"='"+imeiidValue+"'");
      Toast.makeText(mContext, "Deleted successfully.", Toast.LENGTH_SHORT).show();
  
  }
  
  public void updateIMEI(String receivedIMEIId, UpdateIMEIRec updateIMEIRec, User user) {
      SQLiteDatabase db = this.getWritableDatabase();
      String strSQL = "UPDATE "+table_imei+ " SET "+imei+" = "+user.getImei()+"," +
              " "+imeiid+" = "+user.getImeiid()+
              " WHERE "+imeiid+" = "+receivedIMEIId;
      db.execSQL(strSQL);
      db.close();
  
  }
  
  
  
  public User getIMEI(String receivedIMEIId) {
      SQLiteDatabase db = this.getWritableDatabase();
      String query = "SELECT  * FROM " + table_imei  ;
      Cursor cursor = db.rawQuery(query, null);
  
      User user = new User();
      if(cursor.getCount() > 0) {
          cursor.moveToFirst();
  
          user.setImeiid(cursor.getString(cursor.getColumnIndex(imeiid)));
          user.setImei(cursor.getString(cursor.getColumnIndex(imei)));
      }
      return user;
  }
  

  }

  And Here is my Recycler List Activity Class

  public class UserUpdateListActivity extends AppCompatActivity {
  
   AppCompatActivity activity = UserUpdateListActivity.this;
  
   AppCompatTextView textViewName;
   RecyclerView recyclerViewUsers;
   AppCompatButton textViewButtonNewUser;
   List<User> listUsers;
   UserRecyclerAdapterSavedUsers userRecyclerAdapterSavedUsers;
  
   DatabaseHelper databaseHelper;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_user_record_updated_list);
      //getSupportActionBar().setTitle("");
      initViews();
      initObjects();
  }
  
  @Override
  public void onBackPressed() {
      super.onBackPressed();
      startActivity(new Intent(UserUpdateListActivity.this,AdminMain.class));
      finish();
  }
  
  @Override
  protected void onRestart() {
      super.onRestart();
  }
  
  
  /**
   * This method is to initialize views
   */
  private void initViews() {
      textViewName = (AppCompatTextView) findViewById(R.id.textViewName);
      textViewButtonNewUser = (AppCompatButton) findViewById(R.id.btnaddnew);
      recyclerViewUsers = (RecyclerView) findViewById(R.id.recyclerViewUsers);
      textViewButtonNewUser.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              startActivity(new Intent(UserUpdateListActivity.this,UserRecordSaveActivity.class));
          }
      });
  }
  
  /**
   * This method is to initialize objects to be used
   */
  private void initObjects() {
      listUsers = new ArrayList<>();
      userRecyclerAdapterSavedUsers = new UserRecyclerAdapterSavedUsers(listUsers,recyclerViewUsers);
  
      RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
      recyclerViewUsers.setLayoutManager(mLayoutManager);
      recyclerViewUsers.setItemAnimator(new DefaultItemAnimator());
      recyclerViewUsers.setHasFixedSize(true);
      recyclerViewUsers.setAdapter(userRecyclerAdapterSavedUsers);
      databaseHelper = new DatabaseHelper(activity);
  
      String emailFromIntent = getIntent().getStringExtra("USERS");
      textViewName.setText(emailFromIntent);
  
      getDataFromSQLite();
  }
  
  /**
   * This method is to fetch all user records from SQLite
   */
  private void getDataFromSQLite() {
      // AsyncTask is used that SQLite operation not blocks the UI Thread.
      new AsyncTask<Void, Void, Void>() {
          @Override
          protected Void doInBackground(Void... params) {
              listUsers.clear();
              listUsers.addAll(databaseHelper.getAllUser());
  
              return null;
          }
  
          @Override
          protected void onPostExecute(Void aVoid) {
              super.onPostExecute(aVoid);
              userRecyclerAdapterSavedUsers.notifyDataSetChanged();
          }
      }.execute();
  }
  

  }

  This is the Query I am using to delete the data

      public void deletePersonRecord(String useridValue, Context mContext) {
      SQLiteDatabase db = this.getWritableDatabase();
      db.execSQL("DELETE FROM "+table_login+" WHERE "+userid +"='"+useridValue+"'");
      Toast.makeText(mContext, "Deleted successfully.", Toast.LENGTH_SHORT).show();
      db.close();
  }
  

  Here is image of my recycler list

  List Items

  As I click on an Item It open me a Dialog like this Dialog

  When I click on delete this shows me this Clicking on Delete

  After that As I pressed back and again open the Data I deleted again open Logcat has no Errors

  Here is my update activity

  public class UpdateUserRec extends AppCompatActivity {
  EditText UserIDUpdate,UserNameUpdate,UserPasswordUpdate,UserRoleUpdate;
  Button BtnUserRecUpdate;
  
  DatabaseHelper dbHelper;
  String receivedUSERId;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_update_record);
      UserIDUpdate= (EditText) findViewById(R.id.useridupdate);
      UserNameUpdate= (EditText) findViewById(R.id.usernameupdate);
      UserPasswordUpdate= (EditText) findViewById(R.id.userpasswordupdate);
      UserRoleUpdate= (EditText) findViewById(R.id.userroleupdate);
      BtnUserRecUpdate= (Button) findViewById(R.id.userbtnupdate);
  
      dbHelper = new DatabaseHelper(this);
  
      try {
          //get intent to get person id
          receivedUSERId= getIntent().getStringExtra("USER_ID");
      } catch (Exception e) {
          e.printStackTrace();
      }
      User user= dbHelper.getUser(receivedUSERId);
  
      UserIDUpdate.setText(user.getUserid());
      UserNameUpdate.setText(user.getName());
      UserPasswordUpdate.setText(user.getPassword());
      UserRoleUpdate.setText(user.getRole());
  
      BtnUserRecUpdate.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              updateUserFunction();
          }
      });
  }
  
  private void updateUserFunction() {
      String useridupdate = UserIDUpdate.getText().toString().trim();
      String usernameupdate = UserNameUpdate.getText().toString().trim();
      String userpasswordupdate = UserRoleUpdate.getText().toString().trim();
      String userroleupdate = UserRoleUpdate.getText().toString().trim();
  
      if(useridupdate.isEmpty()){
          //error name is empty
          Toast.makeText(this, "Enter User ID", Toast.LENGTH_LONG).show();
      }
  
      if(usernameupdate.isEmpty()){
          //error name is empty
          Toast.makeText(this, "Enter User Name", Toast.LENGTH_LONG).show();
      }
  
      if(userpasswordupdate.isEmpty()){
          //error name is empty
          Toast.makeText(this, "Enter the password", Toast.LENGTH_LONG).show();
      }
  
      if(userroleupdate.isEmpty()){
          //error name is empty
          Toast.makeText(this, "Enter User Role", Toast.LENGTH_LONG).show();
      }
  
      //create updated person
      User user = new User();
  
      //call dbhelper update
      dbHelper.updateUser(receivedUSERId, this, user);
      //finally redirect back home
      // NOTE you can implement an sqlite callback then redirect on success delete
      goBackHome();
  
  }
  
  private void goBackHome() {
      startActivity(new Intent(UpdateUserRec.this,UsersListActivity.class));
  }
  

  }