onCreate metodunun içine yazılan kodlama çalışmıyor ...

kodların tamamı public class MainActivity extends ActionBarActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (savedInstanceState == null) { getSupportFragmentManager().beginTransaction() .add(R.id.container, new PlaceholderFragment()) .commit(); } final ToggleButton ciftli_dugme_nesnesi1=(ToggleButton)findViewById(R.id.toggleButton1); final EditText kullanici_adi_nesnesi1=(EditText)findViewById(R.id.editText1); final EditText sifre_nesnesi1=(EditText)findViewById(R.id.editText3); final Button onay_nesnesi1=(Button)findViewById(R.id.button1); ciftli_dugme_nesnesi1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (ciftli_dugme_nesnesi1.isChecked()) { Toast.makeText(MainActivity.this, "Kilit açıldı", Toast.LENGTH_SHORT).show(); kullanici_adi_nesnesi1.setEnabled(true); sifre_nesnesi1.setEnabled(true); onay_nesnesi1.setEnabled(true); } else { Toast.makeText(MainActivity.this, "Kilitlendi", Toast.LENGTH_SHORT).show(); kullanici_adi_nesnesi1.setEnabled(false); sifre_nesnesi1.setEnabled(false); onay_nesnesi1.setEnabled(false); } } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } public static class PlaceholderFragment extends Fragment { public PlaceholderFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_main, container, false); return rootView; } } }