Question

您好我需要帮助才能在Android中制作计算器我自己做了一点但是我正在寻找一种方法来添加2个数字，例如比答案更准确的5 + 5是10，而不是首先添加数字5而不是将其替换为另一个数字而不是添加它，是否有某种方法可以做到这一点，如何更改此部分：

 public void onClick(View v) {
        switch (v.getId()) {
            case R.id.plus:
                if (operand1 == 0) {
                    operand1 = Integer.parseInt(resultText.getText().toString());
                    resultText.setText("0");
                    operator = "+";
                } else {
                    operand2 = Integer.parseInt(resultText.getText().toString());
                    answer = operand1 + operand2;
                    operand1 = answer;
                    resultText.setText("" + answer);
                    operand2 = 0;
                    answer = 0;
                    operator = "";
                }
                break;

使其成为5 + 5 = 10而不是5，而不是添加并用另一个数字替换它，而不是添加它。

这是我的完整代码：

public class MainActivity extends AppCompatActivity implements View.OnClickListener {


EditText resultText;
Button one1, two1, three1;
Button plus1;
Button four1;
Button five1;
Button six1;
Button minus1;
Button seven1;
Button eight1;
Button nine1;
Button multiply1;
Button clear;
Button zero1;
Button square1;
Button divide1, equals;

int operand1, operand2, answer;
String input, operator;

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


    resultText = (EditText) findViewById(R.id.space);
    resultText.setText("0");
    one1 = (Button) findViewById(R.id.one);
    two1 = (Button) findViewById(R.id.two);
    three1 = (Button) findViewById(R.id.three);
    plus1 = (Button) findViewById(R.id.plus);
    four1 = (Button) findViewById(R.id.four);
    five1 = (Button) findViewById(R.id.five);
    six1 = (Button) findViewById(R.id.six);
    minus1 = (Button) findViewById(R.id.minus);
    seven1 = (Button) findViewById(R.id.seven);
    eight1 = (Button) findViewById(R.id.eight);
    nine1 = (Button) findViewById(R.id.nine);
    multiply1 = (Button) findViewById(R.id.multiply);
    clear = (Button) findViewById(R.id.c);
    zero1 = (Button) findViewById(R.id.zero);
    square1 = (Button) findViewById(R.id.square);
    divide1 = (Button) findViewById(R.id.divide);
    equals = (Button) findViewById(R.id.equal);

    one1.setOnClickListener(this);
    two1.setOnClickListener(this);
    three1.setOnClickListener(this);
    plus1.setOnClickListener(this);
    four1.setOnClickListener(this);
    five1.setOnClickListener(this);
    six1.setOnClickListener(this);
    minus1.setOnClickListener(this);
    seven1.setOnClickListener(this);
    eight1.setOnClickListener(this);
    nine1.setOnClickListener(this);
    multiply1.setOnClickListener(this);
    clear.setOnClickListener(this);
    zero1.setOnClickListener(this);
    square1.setOnClickListener(this);
    divide1.setOnClickListener(this);
    equals.setOnClickListener(this);


}

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.plus:
            if (operand1 == 0) {
                operand1 = Integer.parseInt(resultText.getText().toString());
                resultText.setText("0");
                operator = "+";
            } else {
                operand2 = Integer.parseInt(resultText.getText().toString());
                answer = operand1 + operand2;
                operand1 = answer;
                resultText.setText("" + answer);
                operand2 = 0;
                answer = 0;
                operator = "";
            }
            break;
        case R.id.minus:
            if (operand1 == 0) {
                operand1 = Integer.parseInt(resultText.getText().toString());
                resultText.setText("0");
                operator = "-";
            } else {
                operand2 = Integer.parseInt(resultText.getText().toString());
                answer = operand1 - operand2;
                operand1 = answer;
                resultText.setText("" + answer);
                operator = "";
                operand2 = 0;
                answer = 0;
            }
            break;
        case R.id.multiply:
            if (operand1 == 0) {
                operand1 = Integer.parseInt(resultText.getText().toString());
                operator = "*";
                resultText.setText("0");
            } else {
                operand2 = Integer.parseInt(resultText.getText().toString());
                answer = operand1 * operand2;
                operand1 = answer;
                resultText.setText("" + answer);
                operand2 = 0;
                answer = 0;
                operator = "";
            }
            break;
        case R.id.divide:
            if (operand1 == 0) {
                operand1 = Integer.parseInt(resultText.getText().toString());
                operator = "/";
                resultText.setText("0");
            } else {
                operand2 = Integer.parseInt(resultText.getText().toString());
                answer = operand1 / operand2;
                operand1 = answer;
                resultText.setText("" + answer);
                operand2 = 0;
                answer = 0;
                operator = "";
            }
            break;
        case R.id.equal:
            if (operand1 != 0) {
                operand2 = Integer.parseInt(resultText.getText().toString());
                switch (operator) {
                    case "+":
                        answer = operand1 + operand2;
                        break;
                    case "-":
                        answer = operand1 - operand2;
                        break;
                    case "*":
                        answer = operand1 * operand2;
                        break;
                    case "/":
                        answer = operand1 / operand2;
                        break;
                    default:
                        answer=0;
                        break;
                }
                operand1 = answer;
                resultText.setText("" + answer);
                operand2 = 0;
                answer = 0;
            }
            break;
        case R.id.square:
            operand1 = Integer.parseInt(resultText.getText().toString());
            answer = operand1 * operand1;
            resultText.setText("" + answer);
            operand1 = answer;
            break;
        case R.id.c:
            operand1 = 0;
            operand2 = 0;
            answer = 0;
            resultText.setText("0");
            break;

        default:
            input = resultText.getText().toString();
            if (input.equals("0"))
                input = v.getTag().toString();
            else
                input += v.getTag().toString();
            resultText.setText(input);
            break;
    }
}

}

试着看看你是否可以尽我所能帮助我。

Answer 1

我不确定我是否理解您的确切要求，但看起来您在显示所需的字符串之前设置了操作数1来回答（＆＃34; 5 + 5＆＃34;。）

尝试将代码设置为以下内容：

public void onClick(View v) {
    switch (v.getId()) {
        case R.id.plus:
            if (operand1 == 0) {
                operand1 = Integer.parseInt(resultText.getText().toString());
                resultText.setText("0");
                operator = "+";
            } else {
                operand2 = Integer.parseInt(resultText.getText().toString());
                answer = operand1 + operand2;
                resultText.setText(operand1 + operator + operand2);
            }
            break;

然后为=创建一个单独的按钮，它将触发以下内容：

resultText.setText(answer);
answer = 0;
operand1 = 0;
operand2 = 0;
operator = "";

这看起来仍然很笨拙，但是如果没有看到更多的代码，我就无法确定它是否符合您的构建与否。基本上，显示完整的字符串（＆＃34; 5 + 5＆＃34;），然后按Enter键显示答案（＆＃34; 10＆＃34;）并清理所有其他变量。如果您不想通过单独的按钮触发答案，则可能会将其设置为延迟。

需要帮助在Android中制作计算器

1 个答案: