LottoChanceCalculatorActivity.java

package hr.fer.ruazosa.hw3;

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;


public class LottoChanceCalculatorActivity extends Activity {
    private EditText inputMinor;
    private EditText inputMajor;
    private String errMsg;

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

        errMsg = LottoChanceCalculatorActivity.this.getResources().getString(R.string.calculator_input_error);

        inputMinor = (EditText) findViewById(R.id.calculator_minor);
        inputMajor = (EditText) findViewById(R.id.calculator_major);
        inputMajor.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s) {
                String major = inputMajor.getText().toString();
                if (major.equals("") || major.equals("0") || major.contains(".")) {
                    inputMajor.setError(errMsg);
                }
            }
        });
        inputMinor.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s) {
                String minor = inputMinor.getText().toString();
                if (minor.equals("") || minor.equals("0") || minor.contains(".")) {
                    inputMinor.setError(errMsg);
                }
            }
        });


        Button submit = (Button) findViewById(R.id.calculator_calculate);
        submit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String major = inputMajor.getText().toString();
                String minor = inputMinor.getText().toString();

                if (major.equals("") || major.equals("0") || major.contains(".")) {
                    inputMajor.setError(errMsg);
                }

                if (minor.equals("") || minor.equals("0") || minor.contains(".")) {
                    inputMinor.setError(errMsg);
                }
            }
        });
    }
}