public class Weight extends AppCompatActivity implements View.OnClickListener {




public static AutoCompleteTextView userWeight;
private Button secondPage;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_weight);

    userWeight =(AutoCompleteTextView) findViewById(R.id.weight);
    secondPage = (Button) findViewById(R.id.toHeightPage);

    secondPage.setOnClickListener(this);

}




}

private void enterWeight(){
    String weight = userWeight.getText().toString().trim();

    if(TextUtils.isEmpty(weight)){
        Toast.makeText(Weight.this,"Please Enter your weight", Toast.LENGTH_SHORT).show();


    return;
    }

public class Main_Interface extends AppCompatActivity {
public TextView results;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main__interface);

    Toolbar toolbar = findViewById(R.id.toolbar1);
    setSupportActionBar(toolbar);

    results = (TextView)findViewById(R.id.results);





}
public void calculateBMR(){

}