@Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                finish();
                break;
            case R.id.action_delete:
                AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
                alertDialogBuilder.setTitle("Peringatan");
                alertDialogBuilder
                        .setMessage("Apakah Anda yakin ingin mengapus data ini?")
                        .setCancelable(false)
                        .setPositiveButton("Hapus",new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,int id) {

                                String npm = editTextNPM.getText().toString();
                                Retrofit retrofit = new Retrofit.Builder()
                                        .baseUrl(URL)
                                        .addConverterFactory(GsonConverterFactory.create())
                                        .build();
                                RegisterAPI api = retrofit.create(RegisterAPI.class);
                                Call<Value> call = api.hapus(npm);
                                call.enqueue(new Callback<Value>() {
                                    @Override
                                    public void onResponse(Call<Value> call, Response<Value> response) {
                                        String value = response.body().getValue();
                                        String message = response.body().getMessage();
                                        if (value.equals("1")) {
                                            Toast.makeText(UpdateActivity.this, message, Toast.LENGTH_SHORT).show();
                                            finish();
                                        } else {
                                            Toast.makeText(UpdateActivity.this, message, Toast.LENGTH_SHORT).show();
                                        }
                                    }

                                    @Override
                                    public void onFailure(Call<Value> call, Throwable t) {
                                        t.printStackTrace();
                                        Toast.makeText(UpdateActivity.this, "Jaringan Error!", Toast.LENGTH_SHORT).show();
                                    }
                                });
                            }
                        })
                        .setNegativeButton("Batal",new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog,int id) {
                                dialog.cancel();
                            }
                        });
                AlertDialog alertDialog = alertDialogBuilder.create();
                alertDialog.show();
                break;
        }
        return super.onOptionsItemSelected(item);
    }