mycalc

package com.example.mycalc;


import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import static java.lang.Integer.parseInt;

public class MainActivity extends AppCompatActivity {

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

        // Connect button
        Button calcButton = findViewById(R.id.calcButton);
        calcButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                // Initialize text-fields
                final EditText assignmentOneInput = findViewById(R.id.assignmentOne);
                EditText assignmentTwoInput = findViewById(R.id.assignmentTwo);
                EditText assignmentThreeInput = findViewById(R.id.assignmentThree);
                EditText examMarkInput = findViewById(R.id.examMark);
                TextView displayYearMarkOutput = findViewById(R.id.displayYearMark);
                TextView showMark = findViewById(R.id.showMark);
                TextView displayDistinctions = findViewById(R.id.displayDistinctions);

                // Convert integers to strings
                int fieldOne = parseInt(assignmentOneInput.getText().toString());
                int fieldTwo = parseInt(assignmentTwoInput.getText().toString());
                int fieldThree = parseInt(assignmentThreeInput.getText().toString());
                int fieldFour = parseInt(examMarkInput.getText().toString());
                //String myData1 = assignmentOneInput.getText().toString();
                //int myInt = Integer.parseInt(myData1);
                // Form validation

                if (assignmentTwoInput.getText().toString().trim().isEmpty() || (parseInt(assignmentOneInput.getText().toString())>100)) {
                    assignmentOneInput.setError("Please enter a number between 0 and 100.");
                }

                else if (assignmentTwoInput.getText().toString().trim().isEmpty() || parseInt(assignmentTwoInput.getText().toString())>100) {
                    assignmentTwoInput.setError("Please enter a number between 0 and 100.");
                }

                else if (assignmentThreeInput.getText().toString().trim().isEmpty() || parseInt(assignmentThreeInput.getText().toString())>100) {
                    assignmentThreeInput.setError("Please enter a number between 0 and 100.");
                }

                else if (examMarkInput.getText().toString().trim().isEmpty() || parseInt(examMarkInput.getText().toString())>100) {
                    examMarkInput.setError("Please enter a number between 0 and 100.");
                }
                else
                    assignmentOneInput.setText("");


                //Calculate results
                double yearMark = fieldOne * .15 + fieldTwo * .35 + fieldThree * .50;
                double finalMark = yearMark * .49 + fieldFour * .51;

                // Determine grade
                if (finalMark < 50) {
                    displayDistinctions.setText("F");
                } if (finalMark < 75) {
                    displayDistinctions.setText("P");
                } else {
                    displayDistinctions.setText("D");
                }

                // Convert double to int
                int outPut = (int) yearMark;

                // Display results
                displayYearMarkOutput.setText( "Year mark is " + outPut + "%");
                showMark.setText("Final mark is " + (int)finalMark + "%");
            }
        });
    }
}