public class SettingActivity extends Activity implements OnClickListener {
       Button btn;
       EditText etIPAddress,etDBname,etUserName,etPassword;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_ayarlar);


    Controls();

    SetButtonText();

    }

private void Controls() {
    btn = (Button) findViewById(R.id.btn);
    etIPAddress = (EditText) findViewById(R.id.etIPAddress);
    etDBname = (EditText) findViewById(R.id.etDBname);
    etUserName = (EditText) findViewById(R.id.etUserName);
    etPassword = (EditText) findViewById(R.id.etPassword);

    btn.setOnClickListener(this);
}

private void SetButtonText() {
    DB db = new DB(this);
    db.open();
    Cursor c = db.Query();
    int count = c.getCount();

    if (count == 0) {
        btn.setText("SAVE");
    } else if (count == 1) {
        btn.setText("UPDATE");
        SetResults(c);
    }
    db.close();
}

private void SetResults(Cursor c) {
    while (c.moveToNext()) {
        String ipAddress = c.getString(c.getColumnIndex("IpAddress"));
        String dbName = c.getString(c
                .getColumnIndex("DBname"));
        String userName = c.getString(c.getColumnIndex("UserName"));
        String password = c.getString(c.getColumnIndex("Password"));

        etIPAddress.setText(ipAddress);
        etVeriTabaniAdi.setText(dbName);
        etKullaniciAdi.setText(userName);
        etSifre.setText(password);
    }
}

@Override
public void onClick(View v) {
    String ipAddress = etIPAdresi.getText().toString();
    String dbName = etVeriTabaniAdi.getText().toString();
    String userNmae = etKullaniciAdi.getText().toString();
    String password = etSifre.getText().toString();

    String btnText = btn.getText().toString();

    DB db = new DB(this);
    db.open();

    boolean insertResult = false, updateResult = false;

    if (btnText.equals("SAVE")) {
        insertResult = db.Insert(ipAdress,dbName, userName,
                password);
    } else if (btnText.equals("UPDATE")) {
        updateResult = db.Update(ipAddress, dbName, userName,
                password);
    }

    if (insertResult) {
        Toast.makeText(this, "Data is saved.", Toast.LENGTH_SHORT).show();
    } else if (updateResult) {
        Toast.makeText(this, "Data is updated.", Toast.LENGTH_SHORT)
                .show();
    }

    db.close();
}  }

public class DB {
        private static final String DB_NAME = "Conn";
        private static final int DB_VERSION = 1;
        private static final String DB_CREATE = "CREATE TABLE Info ("
        + "ID INTEGER PRIMARY KEY AUTOINCREMENT, "
        + "IpAddress TEXT, DBname TEXT, "
        + "UserName TEXT, Passsword TEXT);";

private static final String DB_DROP = "DROP TABLE IF EXISTS Info";

private DbHelper helper;
private Context context;
private SQLiteDatabase database;



private static class DbHelper extends SQLiteOpenHelper {
    public DbHelper(Context context) {
        super(context, DB_NAME, null, DB_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(DB_CREATE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL(DB_DROP);
        onCreate(db);
    }
}

public DB(Context context) {
    this.context = context;
}

public DB open() {
    helper = new DbHelper(context);
    database = helper.getWritableDatabase();
    return this;
}

public void close() {
    helper.close();
}

public boolean Insert(String ipAddress, String dbName,
                      String userName, String password) {
    try {
        ContentValues cv = new ContentValues();
        cv.put("IpAddress", ipAddress);
        cv.put("DBname", dbName);
        cv.put("UserNmae", userName);
        cv.put("password", password);
        database.insert("Info", null, cv);
        return true;
    } catch (Exception ex) {
        return false;
    }
}

public boolean Update(String ipAddress, String dbName,
                      String userName, String password) {
    try {
        ContentValues cv = new ContentValues();
        cv.put("IpAddress", ipAddress);
        cv.put("DBname", dbName);
        cv.put("UserName", userName);
        cv.put("Password", password);
        database.update("Info", cv, "ID=?", new String[] { "1" });
        return true;
    } catch (Exception ex) {
        return false;
    }
}

public Cursor Query() {
    Cursor c = database.query("Info", new String[] { "ID", "IpAddress",
                    "DBname", "UserName", "Password" }, null, null, null,null, null);
    return c;
}

public void Delete() {
    database.delete("Info", null, null);
}  }

public class FragmentEmployee extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // TODO Auto-generated method stub

    View view = inflater.inflate(R.layout.fragment_employee, container, false);
    return view;
}

public class MainActivity extends AppCompatActivity {
Toolbar toolbar;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);


    TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
    tabLayout.addTab(tabLayout.newTab().setText("Employee"));
    tabLayout.addTab(tabLayout.newTab().setText("About Company"));
    tabLayout.addTab(tabLayout.newTab().setText("Products"));
    tabLayout.addTab(tabLayout.newTab().setText("Clients"));
    tabLayout.addTab(tabLayout.newTab().setText("Managers"));
    tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);

    final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
    final PagerAdapter adapter = new PagerAdapter
            (getSupportFragmentManager(), tabLayout.getTabCount());
    viewPager.setAdapter(adapter);
    viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
    tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            viewPager.setCurrentItem(tab.getPosition());
        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {

        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {

        }
    });
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        Intent intent=new Intent(this,SettingsActivity.class);
        startActivity(intent);
        return true;
    }

    return super.onOptionsItemSelected(item);
}