Android : Android EditText getText().toStringTrouble

Keep getting a null pointer exception when trying to get the text from my edittext.

The edittext is contained in a nested linear layout

Here's my code

private int id;
private String date;
private String time;
private String name;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_restaurant_reviewer__review_screen);


    this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

    EditText etRestaurantName = (EditText) findViewById(R.id.etRestName);


    Button btnTipCalculator = (Button) findViewById(R.id.btnTipCalculator);
    Button btnSaveRestaurant = (Button) findViewById(R.id.btnSave);


    ReviewClickListener reviewClickListener = new ReviewClickListener();


    btnTipCalculator.setOnClickListener(reviewClickListener);
    btnSaveRestaurant.setOnClickListener(reviewClickListener);


}


private class ReviewClickListener implements View.OnClickListener {
    @Override


    public void onClick(View v) {

        if (v.getId() == R.id.btnTipCalculator) {
            Intent i = new Intent(restaurantReviewer_ReviewScreen.this, RestaurantReviewer_TipCalculator.class);
            startActivity(i);
        }

        if (v.getId() == R.id.btnSave) {

            name = etRestaurantName.getText().toString();


            date = DateFormat.getDateInstance().toString();
            time = DateFormat.getTimeInstance().toString();


            Toast.makeText(getApplicationContext(), name + " ," + date + " ," + time, Toast.LENGTH_LONG).show();


        }

    }
}

} `

How do I remedy this without instantiating my variables in the onClick method?