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Simple-Calculator
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implement Subtraction

This commit is contained in:
tibbi 2015-12-24 21:41:48 +01:00
parent 271bf692dd
commit 82521af7b0
1 changed files with 33 additions and 15 deletions
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48
app/src/main/java/calculator/simplemobiletools/com/simple_calculator/MainActivity.java
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@ -12,7 +12,7 @@ import butterknife.OnClick;
public class MainActivity extends AppCompatActivity { public class MainActivity extends AppCompatActivity {
@Bind(R.id.result) TextView result; @Bind(R.id.result) TextView result;
private double firstValue; private double baseValue;
private double secondValue; private double secondValue;
private boolean resetValue; private boolean resetValue;
private int lastKey; private int lastKey;
@ -21,6 +21,7 @@ public class MainActivity extends AppCompatActivity {
private static final int DIGIT = 0; private static final int DIGIT = 0;
private static final int EQUALS = 1; private static final int EQUALS = 1;
private static final int PLUS = 2; private static final int PLUS = 2;
private static final int MINUS = 3;
@Override @Override
protected void onCreate(Bundle savedInstanceState) { protected void onCreate(Bundle savedInstanceState) {
@ -31,11 +32,11 @@ public class MainActivity extends AppCompatActivity {
private void addDigit(int number) { private void addDigit(int number) {
final String currentValue = getDisplayedNumber(); final String currentValue = getDisplayedNumber();
final String newValue = getFormattedValue(currentValue + number); final String newValue = removeLeadingZero(currentValue + number);
result.setText(newValue); result.setText(newValue);
} }
private String getFormattedValue(String str) { private String removeLeadingZero(String str) {
final double doubleValue = Double.parseDouble(str); final double doubleValue = Double.parseDouble(str);
return Formatter.doubleToString(doubleValue); return Formatter.doubleToString(doubleValue);
} }
@ -57,24 +58,39 @@ public class MainActivity extends AppCompatActivity {
} }
private void addNumbers() { private void addNumbers() {
final double resultValue = firstValue + secondValue; final double resultValue = baseValue + secondValue;
result.setText(Formatter.doubleToString(resultValue)); result.setText(Formatter.doubleToString(resultValue));
firstValue = resultValue; baseValue = resultValue;
}
private void subtractNumbers() {
final double resultValue = baseValue - secondValue;
result.setText(Formatter.doubleToString(resultValue));
baseValue = resultValue;
}
private void handleOperation(int operation) {
if (lastKey == operation)
return;
if (lastKey == DIGIT) {
secondValue = getDisplayedNumberAsDouble();
handleEquals();
baseValue = getDisplayedNumberAsDouble();
}
resetValue = true;
lastKey = operation;
lastOperation = operation;
} }
@OnClick(R.id.btn_plus) @OnClick(R.id.btn_plus)
public void plusClicked() { public void plusClicked() {
resetValue = true; handleOperation(PLUS);
lastOperation = PLUS; }
if (lastKey != DIGIT) { @OnClick(R.id.btn_minus)
lastKey = PLUS; public void minusClicked() {
return; handleOperation(MINUS);
}
secondValue = getDisplayedNumberAsDouble();
addNumbers();
lastKey = PLUS;
} }
@OnClick(R.id.btn_equals) @OnClick(R.id.btn_equals)
@ -95,6 +111,8 @@ public class MainActivity extends AppCompatActivity {
private void handleEquals() { private void handleEquals() {
if (lastOperation == PLUS) if (lastOperation == PLUS)
addNumbers(); addNumbers();
else if (lastOperation == MINUS)
subtractNumbers();
} }
@OnClick(R.id.btn_decimal) @OnClick(R.id.btn_decimal)