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java - 计算器 Android 应用程序中的乘法在输出中抛出 Alphabeta

转载 作者:行者123 更新时间:2023-12-01 11:38:05 30 4
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下面是我正在制作的计算器 Android 应用程序的代码:

package com.example.calculator;

import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Iterator;
import java.util.Stack;
import java.lang.Math;

import android.app.Activity;
import android.os.Bundle;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.view.View;
import android.view.View.OnClickListener;

public class main extends Activity {
GridView mKeypadGrid;
TextView userInputText;
TextView memoryStatText;

Stack<String> mInputStack;
Stack<String> mOperationStack;

KeypadAdapter mKeypadAdapter;
TextView mStackText;
boolean resetInput = false;
boolean hasFinalResult = false;

String mDecimalSeperator;
double memoryValue = Double.NaN;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

DecimalFormat currencyFormatter = (DecimalFormat) NumberFormat
.getInstance();
char decimalSeperator = currencyFormatter.getDecimalFormatSymbols()
.getDecimalSeparator();
mDecimalSeperator = Character.toString(decimalSeperator);

setContentView(R.layout.main);

// Create the stack
mInputStack = new Stack<String>();
mOperationStack = new Stack<String>();

// Get reference to the keypad button GridView
mKeypadGrid = (GridView) findViewById(R.id.grdButtons);

// Get reference to the user input TextView
userInputText = (TextView) findViewById(R.id.txtInput);
userInputText.setText("0");

memoryStatText = (TextView) findViewById(R.id.txtMemory);
memoryStatText.setText("");

mStackText = (TextView) findViewById(R.id.txtStack);

// Create Keypad Adapter
mKeypadAdapter = new KeypadAdapter(this);

// Set adapter of the keypad grid
mKeypadGrid.setAdapter(mKeypadAdapter);

// Set button click listener of the keypad adapter
mKeypadAdapter.setOnButtonClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Button btn = (Button) v;
// Get the KeypadButton value which is used to identify the
// keypad button from the Button's tag
KeypadButton keypadButton = (KeypadButton) btn.getTag();

// Process keypad button
ProcessKeypadInput(keypadButton);
}
});

mKeypadGrid.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {

}
});

}

private void ProcessKeypadInput(KeypadButton keypadButton) {
//Toast.makeText(this, keypadButton.getText(), Toast.LENGTH_SHORT).show();
String text = keypadButton.getText().toString();
String currentInput = userInputText.getText().toString();

int currentInputLen = currentInput.length();
String evalResult = null;
double userInputValue = Double.NaN;

switch (keypadButton) {
case BACKSPACE: // Handle backspace
// If has operand skip backspace
if (resetInput)
return;

int endIndex = currentInputLen - 1;

// There is one character at input so reset input to 0
if (endIndex < 1) {
userInputText.setText("0");
}
// Trim last character of the input text
else {
userInputText.setText(currentInput.subSequence(0, endIndex));
}
break;
case SIGN: // Handle -/+ sign
// input has text and is different than initial value 0
if (currentInputLen > 0 && currentInput != "0") {
// Already has (-) sign. Remove that sign
if (currentInput.charAt(0) == '-') {
userInputText.setText(currentInput.subSequence(1,
currentInputLen));
}
// Prepend (-) sign
else {
userInputText.setText("-" + currentInput.toString());
}
}
break;
case CE: // Handle clear input
userInputText.setText("0");
break;
case C: // Handle clear input and stack
userInputText.setText("0");
clearStacks();
break;
case DECIMAL_SEP: // Handle decimal separator
if (hasFinalResult || resetInput) {
userInputText.setText("0" + mDecimalSeperator);
hasFinalResult = false;
resetInput = false;
} else if (currentInput.contains("."))
return;
else
userInputText.append(mDecimalSeperator);
break;
case DIV:
case PLUS:
case MINUS:
case MULTIPLY:
if (resetInput) {
mInputStack.pop();
mOperationStack.pop();
} else {
if (currentInput.charAt(0) == '-') {
mInputStack.add("(" + currentInput + ")");
} else {
mInputStack.add(currentInput);
}
mOperationStack.add(currentInput);
}

mInputStack.add(text);
mOperationStack.add(text);

dumpInputStack();
evalResult = evaluateResult(false);
if (evalResult != null)
userInputText.setText(evalResult);

resetInput = true;
break;
case CALCULATE:
if (mOperationStack.size() == 0)
break;

mOperationStack.add(currentInput);
evalResult = evaluateResult(true);
if (evalResult != null) {
clearStacks();
userInputText.setText(evalResult);
resetInput = false;
hasFinalResult = true;
}
break;
case M_ADD: // Add user input value to memory buffer
userInputValue = tryParseUserInput();
if (Double.isNaN(userInputValue))
return;
if (Double.isNaN(memoryValue))
memoryValue = 0;
memoryValue += userInputValue;
displayMemoryStat();

hasFinalResult = true;

break;
case M_REMOVE: // Subtract user input value to memory buffer
userInputValue = tryParseUserInput();
if (Double.isNaN(userInputValue))
return;
if (Double.isNaN(memoryValue))
memoryValue = 0;
memoryValue -= userInputValue;
displayMemoryStat();
hasFinalResult = true;
break;
case MC: // Reset memory buffer to 0
memoryValue = Double.NaN;
displayMemoryStat();
break;
case MR: // Read memoryBuffer value
if (Double.isNaN(memoryValue))
return;
userInputText.setText(doubleToString(memoryValue));
displayMemoryStat();
break;
case MS: // Set memoryBuffer value to user input
userInputValue = tryParseUserInput();
if (Double.isNaN(userInputValue))
return;
memoryValue = userInputValue;
displayMemoryStat();
hasFinalResult = true;
break;
default:
if (Character.isDigit(text.charAt(0))) {
if (currentInput.equals("0") || resetInput || hasFinalResult) {
userInputText.setText(text);
resetInput = false;
hasFinalResult = false;
} else {
userInputText.append(text);
resetInput = false;
}

}
break;

}

}

private void clearStacks() {
mInputStack.clear();
mOperationStack.clear();
mStackText.setText("");
}

private void dumpInputStack() {
Iterator<String> it = mInputStack.iterator();
StringBuilder sb = new StringBuilder();

while (it.hasNext()) {
CharSequence iValue = it.next();
sb.append(iValue);

}

mStackText.setText(sb.toString());
}

private String evaluateResult(boolean requestedByUser) {
if ((!requestedByUser && mOperationStack.size() != 4)
|| (requestedByUser && mOperationStack.size() != 3))
return null;

String left = mOperationStack.get(0);
String operator = mOperationStack.get(1);
String right = mOperationStack.get(2);
String tmp = null;
if (!requestedByUser)
tmp = mOperationStack.get(3);

double leftVal = Double.parseDouble(left.toString());
double rightVal = Double.parseDouble(right.toString());
double result = Double.NaN;

if (operator.equals(KeypadButton.DIV.getText())) {
result = leftVal / rightVal;
} else if (operator.equals(KeypadButton.MULTIPLY.getText())) {
result = leftVal * rightVal;
} else if (operator.equals(KeypadButton.PLUS.getText())) {
result = leftVal + rightVal;
} else if (operator.equals(KeypadButton.MINUS.getText())) {
result = leftVal - rightVal;
}

String resultStr = doubleToString(result);
if (resultStr == null)
return null;

mOperationStack.clear();
if (!requestedByUser) {
mOperationStack.add(resultStr);
mOperationStack.add(tmp);
}

return resultStr;
}

private String doubleToString(double value) {
if (Double.isNaN(value))
return null;

long longVal = (long) value;
if (longVal == value)
return Long.toString(longVal);
else
return Double.toString(value);

}

private double tryParseUserInput() {
String inputStr = userInputText.getText().toString();
double result = Double.NaN;
try {
result = Double.parseDouble(inputStr);
} catch (NumberFormatException nfe) {
}

return result;

}

private void displayMemoryStat() {
if (Double.isNaN(memoryValue)) {
memoryStatText.setText("");
} else {
memoryStatText.setText("M = " + doubleToString(memoryValue));
}
}

}

当我将输入指定为 45454545454545 * 54545454545454 时,输出显示为 2.479338842975157E27。我在输出中得到一些字母 E。

乘法代码为:

  if (operator.equals(KeypadButton.MULTIPLY.getText())) {
result = leftVal * rightVal;
}

我想将结果显示为 _______ * 10^x,而不是 E。谁能帮我解决这个问题吗?提前致谢。

最佳答案

您正在谈论如何显示数字..因此您可以使用NumberFormat来指定数字应如何显示,例如:

NumberFormat formatter = new DecimalFormat("#0.00");

了解更多信息:

  1. http://developer.android.com/reference/java/text/NumberFormat.html
  2. http://developer.android.com/reference/java/text/DecimalFormat.html

这是一个很好的例子:http://www.coderzheaven.com/2012/10/14/numberformat-class-android-rounding-number-android-formatting-decimal-values-android/

如果您想保持原样,只想将指数 E 替换为 ^,为什么不尝试:

string.replace("E", "^") 

关于java - 计算器 Android 应用程序中的乘法在输出中抛出 Alphabeta,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29800272/

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