Android Sqlite Veri Ekleme Class Yapısı

---------------------MainActivity XML-----------------------
<LinearLayout
    android:layout_width="368dp"
    android:layout_height="495dp"
    android:orientation="vertical"
    tools:layout_editor_absoluteX="8dp"
    tools:layout_editor_absoluteY="8dp">

    <EditText
        android:id="@+id/etad"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="ad"
        android:inputType="textPersonName" />

    <EditText
        android:id="@+id/etsoyad"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="soyad"
        android:inputType="textPersonName" />

    <EditText
        android:id="@+id/etyas"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="yas"
        android:inputType="textPersonName" />

    <Button
        android:id="@+id/btnekle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Ekle" />




</LinearLayout>

------------------------MainActivity-------------------------------
public class MainActivity extends AppCompatActivity {
    DatabaseHelper myDb;
    EditText ad,soyad,yas;
    Button btnEkle;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        myDb = new DatabaseHelper(this);

        ad = (EditText) findViewById(R.id.etad);
        soyad = (EditText) findViewById(R.id.etsoyad);
        yas = (EditText) findViewById(R.id.etyas);
        btnEkle = (Button) findViewById(R.id.btnekle);
        kayitEkle();

    }
    public void kayitEkle(){
        btnEkle.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                boolean eklendiMi = myDb.veriEkle(ad.getText().toString(),soyad.getText().toString(),yas.getText().toString());

                if(eklendiMi==true){

                    Toast.makeText(MainActivity.this, "Veri Eklendi!", Toast.LENGTH_LONG).show();
                }
                else {
                    Toast.makeText(MainActivity.this, "Veri Eklenemedi!", Toast.LENGTH_LONG).show();
                }



            }
        });
    }
}

-------------------------SQLiteOpenHelper------------------------
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DatabaseHelper extends SQLiteOpenHelper {

    public static  final  String DATABASE_NAME = "BIGBOSS.db";
    public static  final  String TABLE_NAME = "KULLANICI";
    public static  final  String COL1 = "ID";
    public static  final  String COL2 = "AD";
    public static  final  String COL3 = "SOYAD";
    public static  final  String COL4 = "YAS";

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, 1);

    }

    @Override
    public void onCreate(SQLiteDatabase db) {

        db.execSQL("create table " + TABLE_NAME + "( ID INTEGER PRIMARY KEY AUTOINCREMENT , AD TEXT , SOYAD TEXT , YAS INTEGER )");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int i, int i1) {
                db.execSQL("DROP TABLE IF EXISTS " +TABLE_NAME);
                onCreate(db);
    }

    public boolean veriEkle(String ad , String soyad , String yas){
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(COL2,ad);
        contentValues.put(COL3,soyad);
        contentValues.put(COL4,yas);
        long result = db.insert( TABLE_NAME,null,contentValues);
        if(result==-1)
        {
            return false;
        }
        else{
            return  true;
        }
    }
}