Need help with this Android App project. The application keeps crashing when running. It is basically an app that calculates the area and perimeter of a rectangle given the height and width entered by the user in an editText field.

activity_main.xml

MainActivity.java

package com.example.rectanglecalculator; import androidx.appcompat.app.AppCompatActivity; import android.content.SharedPreferences; import android.os.Bundle; import android.view.KeyEvent; import android.view.View; import android.view.inputmethod.EditorInfo; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class MainActivity extends AppCompatActivity implements TextView.OnEditorActionListener{ private EditText heightField; private EditText widthField; private TextView areaCalculated; private TextView permimeterCalculated; private Button getResults; private SharedPreferences savedValues; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); heightField = (EditText)findViewById(R.id.heightField); widthField = (EditText)findViewById(R.id.widthField); areaCalculated = (TextView)findViewById(R.id.areaCalculated); permimeterCalculated = (TextView)findViewById(R.id.perimeterCalculated); getResults = (Button)findViewById(R.id.getResults); heightField.setOnEditorActionListener(this); widthField.setOnEditorActionListener(this); // create an onLister method here // remember calculate method to pass up getResults.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { calculate(); } }); } public void calculate(){ Float nWidth = Float.parseFloat(widthField.getText().toString()); Float nHeight = Float.parseFloat(heightField.getText().toString()); Float finalArea = nWidth * nHeight; areaCalculated.setText(finalArea.toString()); Float finalPerimeter = (nWidth * 2) + (nHeight *2); permimeterCalculated.setText(finalPerimeter.toString()); } @Override public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { if (actionId == EditorInfo.IME_ACTION_DONE || actionId == EditorInfo.IME_ACTION_UNSPECIFIED){ calculate(); } return false; } }