xrrrrrr1
pmkpopo
2020-03-20 11:04

Android Studio实现计算器,运行后点击计算器上的键没有反应,求大神看看代码哪出错了。。。

10
  • android-studio

public class MainActivity extends AppCompatActivity {
private Button button1, button2, button3, button_div, button_7, button_8, button_9, button_mul, button_4, button_5, button_6, button_sub, button_1, button_2, button_3, button_add, button_0, button_dot, button_equal;
private EditText et_res;
private final String TAG = "CAL";

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.my_layout);
    button1 = (Button) findViewById(R.id.button1);
    button2 = (Button) findViewById(R.id.button2);
    button3 = (Button) findViewById(R.id.button3);
    button_div = (Button) findViewById(R.id.button_div);
    button_7 = (Button) findViewById(R.id.button_7);
    button_8 = (Button) findViewById(R.id.button_8);
    button_9 = (Button) findViewById(R.id.button_9);
    button_4 = (Button) findViewById(R.id.button_4);
    button_5 = (Button) findViewById(R.id.button_5);
    button_6 = (Button) findViewById(R.id.button_6);
    button_1 = (Button) findViewById(R.id.button_1);
    button_2 = (Button) findViewById(R.id.button_2);
    button_3 = (Button) findViewById(R.id.button_3);
    button_add = (Button) findViewById(R.id.button_add);
    button_0 = (Button) findViewById(R.id.button_0);
    button_dot = (Button) findViewById(R.id.button_dot);
    button_equal = (Button) findViewById(R.id.button_equal);
    button_mul = (Button) findViewById(R.id.button_mul);
    button_sub = (Button) findViewById(R.id.button_sub);
    et_res = (EditText) findViewById(R.id.et_res);
}

private class MyOnClickLis implements View.OnClickListener {
    private String str1 = "0";//第一个操作数
    private String str2 = "";//第二个操作数
    private String oper = "";//当前的运算符
    private String strResult = "0";//当前显示的结果
    private int lastInput = 0;//最后输入的值,0=数字,1=运算符

    private void numInput(int num) {
        if (strResult.equals("0")) {
            strResult = " " + num;
        } else if (lastInput == 0) {
            strResult = strResult + num;
        } else if (lastInput == 1) {
            strResult = " " + num;
        }
        et_res.setText(strResult);
        lastInput = 0;
    }

    private void dotInput() {
        if (strResult.indexOf(".") == -1) {
            strResult = strResult + ".";
            et_res.setText(strResult);
        }
    }

    private void operationInput(String op) {
        if (lastInput == 1) {
            oper = op;
            lastInput = 1;
            return;
        }
        if (oper.isEmpty()) {
            oper = op;
            str1 = strResult;
        } else if (!str1.isEmpty()) {
            str2 = strResult;
        }
        if (op.equals("+")) {
            double op1 = Double.parseDouble(str1);
            double op2 = Double.parseDouble(str2);
            strResult = String.valueOf(op1 + op2);
            et_res.setText(strResult);
            str1 = strResult;
            oper = op;
        } else if (op.equals("-")) {
            double op1 = Double.parseDouble(str1);
            double op2 = Double.parseDouble(str2);
            strResult = String.valueOf(op1 - op2);
            et_res.setText(strResult);
            str1 = strResult;
            oper = op;
        } else if (op.equals("*")) {
            double op1 = Double.parseDouble(str1);
            double op2 = Double.parseDouble(str2);
            strResult = String.valueOf(op1 * op2);
            et_res.setText(strResult);
            str1 = strResult;
            oper = op;
        } else if (op.equals("/")) {
            double op1 = Double.parseDouble(str1);
            double op2 = Double.parseDouble(str2);
            if (op2 == 0) {
                et_res.setText("错误");
            } else if (op2 != 0) {
                strResult = String.valueOf(op1 / op2);
                et_res.setText(strResult);
                str1 = strResult;
                oper = op;
            }
        }
    }
        private void percentInput () {
            double op1 = Double.parseDouble(strResult);
            strResult = Double.toString(op1 / 100);
            et_res.setText(strResult);
        }
        private void acInput(){
            strResult = "0";
            lastInput = 0;
            oper = "";
            str1 = str2 = "0";
            et_res.setText(strResult);
        }
        private void psInput(){
           double op1=Double.parseDouble(strResult);
           strResult=Double.toString(-op1);
           et_res.setText(strResult);
        }
        private void equalInput(){
            if (oper.isEmpty()) {
                return;
            }
            if (lastInput == 1 && !str1.isEmpty()) {
                if (oper.equals("+")) {
                    double op1 = Double.parseDouble(str1);
                    double op2 = Double.parseDouble(strResult);
                    strResult = String.valueOf(op1 + op2);
                    et_res.setText(strResult);
                } else if (oper.equals("-")) {
                    double op1 = Double.parseDouble(str1);
                    double op2 = Double.parseDouble(strResult);
                    strResult = String.valueOf(op1 - op2);
                    et_res.setText(strResult);
                } else if (oper.equals("*")) {
                    double op1 = Double.parseDouble(str1);
                    double op2 = Double.parseDouble(strResult);
                    strResult = String.valueOf(op1 * op2);
                    et_res.setText(strResult);
                } else if (oper.equals("/")) {
                    double op1 = Double.parseDouble(str1);
                    double op2 = Double.parseDouble(strResult);
                    strResult = String.valueOf(op1 / op2);
                    et_res.setText(strResult);
                }
            } else if (lastInput == 0 && !str2.isEmpty()) {
                if (oper.equals("+")) {
                    double op1 = Double.parseDouble(str1);
                    double op2 = Double.parseDouble(str2);
                    strResult = String.valueOf(op1 + op2);
                    et_res.setText(strResult);
                } else if (oper.equals("-")) {
                    double op1 = Double.parseDouble(str1);
                    double op2 = Double.parseDouble(str2);
                    strResult = String.valueOf(op1 - op2);
                    et_res.setText(strResult);
                } else if (oper.equals("*")) {
                    double op1 = Double.parseDouble(str1);
                    double op2 = Double.parseDouble(str2);
                    strResult = String.valueOf(op1 * op2);
                    et_res.setText(strResult);
                } else if (oper.equals("/")) {
                    double op1 = Double.parseDouble(str1);
                    double op2 = Double.parseDouble(str2);
                    strResult = String.valueOf(op1 / op2);
                    et_res.setText(strResult);
                }
            }
        }
        @Override
      public void onClick(View v){
          switch (v.getId()){
              case R.id.button_0:
                  numInput(0);
                  break;
              case R.id.button_1:
                  numInput(1);
                  break;
              case R.id.button_2:
                  numInput(2);
                  break;
              case R.id.button_3:
                  numInput(3);
                  break;
              case R.id.button_4:
                  numInput(4);
                  break;
              case R.id.button_5:
                  numInput(5);
                  break;
              case R.id.button_6:
                  numInput(6);
                  break;
              case R.id.button_7:
                  numInput(7);
                  break;
              case R.id.button_8:
                  numInput(8);
                  break;
              case R.id.button_9:
                  numInput(9);
                  break;
              case R.id.button_add:
                  operationInput("+");
                  break;
              case R.id.button_sub:
                  operationInput("-");
                  break;
              case R.id.button_mul:
                  operationInput("*");
                  break;
              case R.id.button_div:
                  operationInput("/");
                  break;
              case R.id.button1:
                  acInput();
                  break;
              case R.id.button2:
                  psInput();
                  break;
              case R.id.button3:
                  percentInput();
                  break;
              case R.id.button_dot:
                  dotInput();
                  break;
              case R.id.button_equal:
                  equalInput();
                  break;
          }
        }
    }

}

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