title: How to pass agruments in method from class to another class?
body: <p>In below given code I need to delete one by one contact data from database of SQLlite. <br>For this I write a method in Database Handler.java class. <br>But during using this method in Main AndroidSQLiteTutorialActivity.java class I have problem in passing arguments.(Where I write a comment "I feel a problem here").</p>
  
  <p><br></p>
  
  <p>And how can I trace all the save contacts in database to check that It is present or not. I need to show a pop up massage on screen if contact(data) is present in data base?</p>
  
  <p>This is android AndroidSQLiteTutorialActivity.java class  </p>
  
  <pre><code>package com.androidhive.androidsqlite;
  
  import java.util.List;
  
  import android.app.Activity;
  import android.os.Bundle;
  import android.util.Log;
  import android.view.View;
  import android.view.View.OnClickListener;
  import android.widget.Button;
  import android.widget.EditText;
  
  
  public class AndroidSQLiteTutorialActivity extends Activity {
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
    final EditText editText = (EditText)findViewById(R.id.editText2); 
     final EditText editText2 = (EditText)findViewById(R.id.editText3); 
     Button button = (Button)findViewById(R.id.button1);
     button.setOnClickListener(new OnClickListener() {
  
      @Override
      public void onClick(View arg0) {
          // TODO Auto-generated method stub
          String str1 = editText.getText().toString();
          String str2 = editText2.getText().toString();   
  
  
  
  
      DatabaseHandler db = new DatabaseHandler(AndroidSQLiteTutorialActivity.this);
  
  
      /**
       * CRUD Operations
       * */
      // Inserting Contacts
      Log.d("Insert: ", "Inserting ..");
      //  db.addContact(new Contact(str1, str2));
      //db.addContact(new Contact(str2, "9199999999"));
      //db.addContact(new Contact("Tommy", "9522222222"));
      //db.addContact(new Contact("Karthik", "9533333333"));
  
      // Reading all contacts
  
      db.deleteContact( "What should i need to pass here"???)   //Here I feel problem
  
      Log.d("Reading: ", "Reading all contacts..");
      List&lt;Contact&gt; contacts = db.getAllContacts();       
  
      for (Contact cn : contacts) {
          String log = "Id: "+cn.getID()+" ,Name: " + cn.getName() + " ,Phone: " + cn.getPhoneNumber();
              // Writing Contacts to log
      Log.d("Name: ", log);
  
      }
  
      }
     });
  
  
     }
  }
  </code></pre>
  
  <p>This is a DatabaseHandler.java class</p>
  
  <pre><code>package com.androidhive.androidsqlite;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import android.content.ContentValues;
  import android.content.Context;
  import android.database.Cursor;
  import android.database.sqlite.SQLiteDatabase;
  import android.database.sqlite.SQLiteOpenHelper;
  
  public class DatabaseHandler extends SQLiteOpenHelper {
  
  // All Static variables
  // Database Version
  private static final int DATABASE_VERSION = 1;
  
  // Database Name
  private static final String DATABASE_NAME = "contactsManager";
  
  // Contacts table name
  private static final String TABLE_CONTACTS = "contacts";
  
  // Contacts Table Columns names
  private static final String KEY_ID = "id";
  private static final String KEY_NAME = "name";
  private static final String KEY_PH_NO = "phone_number";
  
  public DatabaseHandler(Context context) {
      super(context, DATABASE_NAME, null, DATABASE_VERSION);
  }
  
  // Creating Tables
  @Override
  public void onCreate(SQLiteDatabase db) {
      String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "("
              + KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
              + KEY_PH_NO + " TEXT" + ")";
      db.execSQL(CREATE_CONTACTS_TABLE);
  }
  
  // Upgrading database
  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
      // Drop older table if existed
      db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS);
  
      // Create tables again
      onCreate(db);
  }
  
  /**
   * All CRUD(Create, Read, Update, Delete) Operations
   */
  
  // Adding new contact
  void addContact(Contact contact) {
      SQLiteDatabase db = this.getWritableDatabase();
  
      ContentValues values = new ContentValues();
      values.put(KEY_NAME, contact.getName()); // Contact Name
      values.put(KEY_PH_NO, contact.getPhoneNumber()); // Contact Phone
  
      // Inserting Row
      db.insert(TABLE_CONTACTS, null, values);
      db.close(); // Closing database connection
  }
  
  // Getting single contact
  Contact getContact(int id) {
      SQLiteDatabase db = this.getReadableDatabase();
  
      Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID,
              KEY_NAME, KEY_PH_NO }, KEY_ID + "=?",
              new String[] { String.valueOf(id) }, null, null, null, null);
      if (cursor != null)
          cursor.moveToFirst();
  
      Contact contact = new Contact(Integer.parseInt(cursor.getString(0)),
              cursor.getString(1), cursor.getString(2));
      // return contact
      return contact;
  }
  
  // Getting All Contacts
  public List&lt;Contact&gt; getAllContacts() {
      List&lt;Contact&gt; contactList = new ArrayList&lt;Contact&gt;();
      // Select All Query
      String selectQuery = "SELECT  * FROM " + TABLE_CONTACTS;
  
      SQLiteDatabase db = this.getWritableDatabase();
      Cursor cursor = db.rawQuery(selectQuery, null);
  
      // looping through all rows and adding to list
      if (cursor.moveToFirst()) {
          do {
              Contact contact = new Contact();
              contact.setID(Integer.parseInt(cursor.getString(0)));
              contact.setName(cursor.getString(1));
              contact.setPhoneNumber(cursor.getString(2));
              // Adding contact to list
              contactList.add(contact);
          } while (cursor.moveToNext());
      }
  
      // return contact list
      return contactList;
  }
  
  // Updating single contact
  public int updateContact(Contact contact) {
      SQLiteDatabase db = this.getWritableDatabase();
  
      ContentValues values = new ContentValues();
      values.put(KEY_NAME, contact.getName());
      values.put(KEY_PH_NO, contact.getPhoneNumber());
  
      // updating row
      return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?",
              new String[] { String.valueOf(contact.getID()) });
  }
  
  // Deleting single contact
  public void deleteContact(Contact contact) {
      SQLiteDatabase db = this.getWritableDatabase();
      db.delete(TABLE_CONTACTS, KEY_ID + " = ?",
              new String[] { String.valueOf(contact.getID()) });
      db.close();
  }
  
  
  // Getting contacts Count
  public int getContactsCount() {
      String countQuery = "SELECT  * FROM " + TABLE_CONTACTS;
      SQLiteDatabase db = this.getReadableDatabase();
      Cursor cursor = db.rawQuery(countQuery, null);
      cursor.close();
  
      // return count
      return cursor.getCount();
  }
  
  }
  </code></pre>