package com.gp89developers.calculatorinputview.activities;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.text.InputFilter;
import android.text.TextUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import com.gp89developers.calculatorinputview.R;
import com.gp89developers.calculatorinputview.utils.Operators;
import com.gp89developers.calculatorinputview.widget.NumericEditText;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.util.ArrayList;
import java.util.List;
public class CalculatorActivity extends AppCompatActivity {
public static final int NUMBER_EDIT_TEXT_MAX_LENGTH = 30;
public static final int REQUEST_RESULT_SUCCESSFUL = 2;
public static final String TITLE_ACTIVITY = "title_activity";
public static final String VALUE = "value_calculator";
public static final String RESULT = "result_calculator";
public static final String ZERO = "0";
public static final String ZERO_ZERO = "00";
public static final String POINT = ".";
public static final String CLICK_ARITHMETIC_OPERATOR = "clickArithmeticOperator";
public static final String CLEAR_INPUT = "clearInput";
public static final String FIRST_VALUE = "firstValue";
public static final String SECONDS_VALUE = "secondsValue";
public static final String OPERATOR_EXECUTE = "operatorExecute";
public static final String PREV_OPERATOR_EXECUTE = "prevOperatorExecute";
private DecimalFormat decimalFormat;
//input
private NumericEditText inputNumberText;
private TextView developmentOperationInputText;
//button operation
private Button equalBtn;
private Button submitBtn;
//operations values
private boolean clickArithmeticOperator;
private boolean clearInput;
private final OnClickListener mOnNumberBtnClickListener = new OnClickListener() {
public void onClick(View view) {
if (view instanceof Button) {
String value = ((Button) view).getText().toString();
concatNumeric(value);
clickArithmeticOperator = false;
}
}
};
private Double firstValue;
private Double secondsValue;
private String operatorExecute = Operators.NONE;
private String prevOperatorExecute = Operators.NONE;
private final OnClickListener mOnOperatorBtnClickListener = new OnClickListener() {
public void onClick(View view) {
if (view instanceof Button) {
String value = ((Button) view).getText().toString();
switch (value) {
case Operators.SUM:
case Operators.SUBTRACTION:
case Operators.MULTIPLICATION:
case Operators.DIVIDER: {
if (TextUtils.isEmpty(inputNumberText.getText())
|| inputNumberText.getText().toString().equals("."))
return;
equalBtn.setVisibility(View.VISIBLE);
submitBtn.setVisibility(View.GONE);
operatorExecute = value;
if (!clickArithmeticOperator) {
clickArithmeticOperator = true;
prepareOperation(false);
} else {
replaceOperator(value);
}
break;
}
case Operators.CLEAR: {
clear();
break;
}
case Operators.DELETE: {
removeLastNumber();
break;
}
case Operators.EQUAL:
case Operators.SUBMIT: {
if (inputNumberText.getText().toString().equals(".")) {
String temp = developmentOperationInputText.getText().toString();
clear();
inputNumberText.setText(temp);
return;
}
if (operatorExecute.equals(Operators.SUBMIT) || firstValue == null) {
returnResultOperation();
} else {
prepareOperation(true);
clearInput = false;
clickArithmeticOperator = false;
operatorExecute = Operators.SUBMIT;
prevOperatorExecute = Operators.NONE;
firstValue = null;
secondsValue = null;
}
break;
}
}
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_calculator);
setupActionBar();
initComponents();
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if (outState != null) {
outState.putBoolean(CLICK_ARITHMETIC_OPERATOR, clickArithmeticOperator);
outState.putBoolean(CLEAR_INPUT, clearInput);
if (firstValue != null)
outState.putDouble(FIRST_VALUE, firstValue);
if (secondsValue != null)
outState.putDouble(SECONDS_VALUE, secondsValue);
outState.putString(OPERATOR_EXECUTE, operatorExecute);
outState.putString(PREV_OPERATOR_EXECUTE, prevOperatorExecute);
}
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
if (savedInstanceState != null) {
clickArithmeticOperator = savedInstanceState.getBoolean(CLICK_ARITHMETIC_OPERATOR);
clearInput = savedInstanceState.getBoolean(CLEAR_INPUT);
if (savedInstanceState.containsKey(FIRST_VALUE))
firstValue = savedInstanceState.getDouble(FIRST_VALUE);
if (savedInstanceState.containsKey(SECONDS_VALUE))
secondsValue = savedInstanceState.getDouble(SECONDS_VALUE);
operatorExecute = savedInstanceState.getString(OPERATOR_EXECUTE);
prevOperatorExecute = savedInstanceState.getString(PREV_OPERATOR_EXECUTE);
}
}
@Override
public boolean onSupportNavigateUp() {
finish();
return super.onSupportNavigateUp();
}
private void setupActionBar() {
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayHomeAsUpEnabled(true);
}
}
private void initComponents() {
DecimalFormatSymbols decimalFormatSymbols = new DecimalFormatSymbols();
decimalFormatSymbols.setGroupingSeparator(',');
decimalFormatSymbols.setDecimalSeparator('.');
decimalFormat = new DecimalFormat("#,###,##0.00", decimalFormatSymbols);
String title = getIntent().getStringExtra(TITLE_ACTIVITY);
if (!TextUtils.isEmpty(title)) {
setTitle(getIntent().getStringExtra(TITLE_ACTIVITY));
} else {
setTitle(getString(R.string.app_name));
}
String value = TextUtils.isEmpty(getIntent().getStringExtra(VALUE)) ? "" : getIntent().getStringExtra(VALUE);
developmentOperationInputText = (TextView) findViewById(R.id.developing_operation_inputText);
inputNumberText = (NumericEditText) findViewById(R.id.number_inputText);
inputNumberText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(NUMBER_EDIT_TEXT_MAX_LENGTH)});
inputNumberText.setText(value);
Button clearBtn = (Button) findViewById(R.id.clear_button);
Button deleteBtn = (Button) findViewById(R.id.delete_button);
equalBtn = (Button) findViewById(R.id.equal_button);
submitBtn = (Button) findViewById(R.id.submit_button);
Button dividerBtn = (Button) findViewById(R.id.divider_button);
Button multiplicationBtn = (Button) findViewById(R.id.multiplication_button);
Button subtractionBtn = (Button) findViewById(R.id.subtraction_button);
Button sumBtn = (Button) findViewById(R.id.sum_button);
Button pointBtn = (Button) findViewById(R.id.point_button);
Button zeroBtn = (Button) findViewById(R.id.zero_button);
Button twoZeroButton = (Button) findViewById(R.id.two_zero_button);
Button oneBtn = (Button) findViewById(R.id.one_button);
Button twoBtn = (Button) findViewById(R.id.two_button);
Button threeBtn = (Button) findViewById(R.id.three_button);
Button fourBtn = (Button) findViewById(R.id.four_button);
Button fiveBtn = (Button) findViewById(R.id.five_button);
Button sixBtn = (Button) findViewById(R.id.six_button);
Button sevenBtn = (Button) findViewById(R.id.seven_button);
Button eightBtn = (Button) findViewById(R.id.eight_button);
Button nineBtn = (Button) findViewById(R.id.nine_button);
List<Button> arithmeticOperators = new ArrayList<>();
arithmeticOperators.add(dividerBtn);
arithmeticOperators.add(multiplicationBtn);
arithmeticOperators.add(subtractionBtn);
arithmeticOperators.add(sumBtn);
List<Button> secondaryOperators = new ArrayList<>();
secondaryOperators.add(clearBtn);
secondaryOperators.add(deleteBtn);
secondaryOperators.add(equalBtn);
secondaryOperators.add(submitBtn);
List<Button> numericOperators = new ArrayList<>();
numericOperators.add(pointBtn);
numericOperators.add(zeroBtn);
numericOperators.add(twoZeroButton);
numericOperators.add(oneBtn);
numericOperators.add(twoBtn);
numericOperators.add(threeBtn);
numericOperators.add(fourBtn);
numericOperators.add(fiveBtn);
numericOperators.add(sixBtn);
numericOperators.add(sevenBtn);
numericOperators.add(eightBtn);
numericOperators.add(nineBtn);
setOnClickListenerBtn(arithmeticOperators, mOnOperatorBtnClickListener);
setOnClickListenerBtn(secondaryOperators, mOnOperatorBtnClickListener);
setOnClickListenerBtn(numericOperators, mOnNumberBtnClickListener);
}
private void prepareOperation(boolean isEqualExecute) {
clearInput = true;
if (isEqualExecute) {
equalBtn.setVisibility(View.GONE);
submitBtn.setVisibility(View.VISIBLE);
developmentOperationInputText.setText("");
} else {
concatDevelopingOperation(operatorExecute, inputNumberText.getText().toString(), false);
}
if (firstValue == null) {
firstValue = Double.parseDouble(inputNumberText.getText().toString().replaceAll(",", ""));
} else if (secondsValue == null) {
secondsValue = Double.parseDouble(inputNumberText.getText().toString().replaceAll(",", ""));
executeOperation(prevOperatorExecute);
}
prevOperatorExecute = operatorExecute;
}
private void executeOperation(String operator) {
if (firstValue == null || secondsValue == null) {
return;
}
double resultOperation = 0.0;
switch (operator) {
case Operators.SUM: {
resultOperation = firstValue + secondsValue;
break;
}
case Operators.SUBTRACTION: {
resultOperation = firstValue - secondsValue;
break;
}
case Operators.MULTIPLICATION: {
resultOperation = firstValue * secondsValue;
break;
}
case Operators.DIVIDER: {
if (secondsValue > 0) {
resultOperation = firstValue / secondsValue;
}
break;
}
}
inputNumberText.setText(formatValue(resultOperation));
firstValue = resultOperation;
secondsValue = null;
}
private void concatNumeric(String value) {
if (value == null || inputNumberText.getText() == null) {
return;
}
String oldValue = inputNumberText.getText().toString();
String newValue = clearInput || (oldValue.equals(ZERO) && !value.equals(POINT)) ? value : oldValue + value;
newValue = oldValue.equals(ZERO) && value.equals(ZERO_ZERO) ? oldValue : newValue;
inputNumberText.setText(newValue);
clearInput = false;
}
private void concatDevelopingOperation(String operator, String value, boolean clear) {
boolean noValidCharacter = operator.equals(Operators.CLEAR) || operator.equals(Operators.DELETE) || operator.equals(Operators.EQUAL);
if (!noValidCharacter) {
String oldValue = clear ? "" : developmentOperationInputText.getText().toString();
developmentOperationInputText.setText(String.format("%s %s %s", oldValue, value, operator));
}
}
private void removeLastNumber() {
String value = inputNumberText.getText().toString();
if (value.length() != 0)
inputNumberText.setText(value.substring(0, value.length() - 1));
}
private void clear() {
equalBtn.setVisibility(View.GONE);
submitBtn.setVisibility(View.VISIBLE);
firstValue = null;
secondsValue = null;
operatorExecute = Operators.NONE;
prevOperatorExecute = Operators.NONE;
developmentOperationInputText.setText("");
inputNumberText.setText("");
}
private void setOnClickListenerBtn(List<Button> buttons, OnClickListener onClickListener) {
for (Button button : buttons) {
button.setOnClickListener(onClickListener);
}
}
private void returnResultOperation() {
String result = inputNumberText.getText().toString();
Intent resultIntent = new Intent();
if (result.equals(".")) {
result = "";
}
resultIntent.putExtra(RESULT, result);
setResult(REQUEST_RESULT_SUCCESSFUL, resultIntent);
finish();
}
private void replaceOperator(String operator) {
String operationValue = developmentOperationInputText.getText().toString();
if (TextUtils.isEmpty(operationValue)) {
return;
}
String oldOperator = operationValue.substring(operationValue.length() - 1, operationValue.length());
if (oldOperator.equals(operator)) {
return;
}
String operationNewValue = operationValue.substring(0, operationValue.length() - 2);
concatDevelopingOperation(operator, operationNewValue, true);
}
private String formatValue(double value) {
String valueStr = decimalFormat.format(value);
String integerValue = valueStr.substring(0, valueStr.indexOf(POINT));
String decimalValue = valueStr.substring(valueStr.indexOf(POINT) + 1, valueStr.length());
if (decimalValue.equals(ZERO_ZERO) || decimalValue.equals(ZERO)) {
return integerValue;
}
return valueStr;
}
}
