按==号没反应。新手求解答，

Question

package com.example.myfirstproject;import android.R.integer;import android.app.Activity;import android.os.Bundle;import android.telephony.SignalStrength;import android.text.Editable;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;public class MainActivity extends Activity implements OnClickListener { Button btn_0; Button btn_1; Button btn_2; Button btn_3; Button btn_4; Button btn_5; Button btn_6; Button btn_7; Button btn_8; Button btn_9; Button btn_point; Button btn_clear; Button btn_del; Button btn_plus; Button btn_minus; Button btn_multiply; Button btn_divide; Button btn_equal; EditText et_input; boolean clear_flag; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btn_0 = (Button) findViewById(R.id.btn_0); btn_1 = (Button) findViewById(R.id.btn_1); btn_2 = (Button) findViewById(R.id.btn_2); btn_3 = (Button) findViewById(R.id.btn_3); btn_4 = (Button) findViewById(R.id.btn_4); btn_5 = (Button) findViewById(R.id.btn_5); btn_6 = (Button) findViewById(R.id.btn_6); btn_7 = (Button) findViewById(R.id.btn_7); btn_8 = (Button) findViewById(R.id.btn_8); btn_9 = (Button) findViewById(R.id.btn_9); btn_point = (Button) findViewById(R.id.btn_point); btn_clear = (Button) findViewById(R.id.btn_clear); btn_del = (Button) findViewById(R.id.btn_del); btn_plus = (Button) findViewById(R.id.btn_plus); btn_minus = (Button) findViewById(R.id.btn_minus); btn_multiply = (Button) findViewById(R.id.btn_multiply); btn_divide = (Button) findViewById(R.id.btn_divide); btn_equal = (Button) findViewById(R.id.btn_equal); et_input = (EditText) findViewById(R.id.edt); btn_0.setOnClickListener(this); btn_1.setOnClickListener(this); btn_2.setOnClickListener(this); btn_3.setOnClickListener(this); btn_4.setOnClickListener(this); btn_5.setOnClickListener(this); btn_6.setOnClickListener(this); btn_7.setOnClickListener(this); btn_8.setOnClickListener(this); btn_9.setOnClickListener(this); btn_point.setOnClickListener(this); btn_clear.setOnClickListener(this); btn_del.setOnClickListener(this); btn_plus.setOnClickListener(this); btn_minus.setOnClickListener(this); btn_multiply.setOnClickListener(this); btn_divide.setOnClickListener(this); btn_equal.setOnClickListener(this); } @Override public void onClick(View v) { // TODO Auto-generated method stub String str = et_input.getText().toString(); switch (v.getId()) { case R.id.btn_0: case R.id.btn_1: case R.id.btn_2: case R.id.btn_3: case R.id.btn_4: case R.id.btn_5: case R.id.btn_6: case R.id.btn_7: case R.id.btn_8: case R.id.btn_9: case R.id.btn_point: if (clear_flag) { clear_flag = false; et_input.setText(""); } et_input.setText(str + ((Button) v).getText()); break; case R.id.btn_plus: case R.id.btn_minus: case R.id.btn_multiply: case R.id.btn_divide: if (clear_flag) { clear_flag = false; et_input.setText(""); } et_input.setText(str + "" + ((Button) v).getText() + ""); break; case R.id.btn_del: if (clear_flag) { clear_flag = false; et_input.setText(""); } else if (str != null && str.equals("")) { et_input.setText(str.substring(0, str.length() - 1)); } break; case R.id.btn_clear: clear_flag = false; et_input.setText(""); break; case R.id.btn_equal: getResult(); break; } } private void getResult() { String exp = et_input.getText().toString(); if (exp == null || exp.equals("")) return; if (!exp.contains("  ")) return; if (clear_flag) { clear_flag = false; return; } clear_flag = true; double result = 0; String s1 = exp.substring(0, exp.indexOf(" "));//运算符前面的字符串 String op = exp.substring(exp.indexOf(" ") + 1, exp.indexOf(" ") + 2);//运算符 String s2 = exp.substring(exp.indexOf(" ") + 3);//运算符后面的字符串 if (!s1.equals("") && !s2.equals("")) { double d1 = Double.parseDouble(s1); double d2 = Double.parseDouble(s2); if (op.equals("+")) { result = d1 + d2; } else if (op.equals("-")) { result = d1 - d2; } else if (op.equals("×")) { result = d1 * d2; } else if (op.equals("÷")) { if (d2 == 0) result = 0; else result = d1 / d2; } if (!s1.contains(".") && !s2.contains(".")) { int r = (int) result; et_input.setText(r + ""); } else et_input.setText(result + ""); } else if (!s1.equals("") && s2.equals("")) et_input.setText(exp); else if (s1.equals("") && !s2.equals("")) { double d2 = Double.parseDouble(s2); if (op.equals("+")) { result = 0 + d2; } else if (op.equals("-")) { result = 0 - d2; } else if (op.equals("×")) { result = 0; } else if (op.equals("÷")) { result = 0; } if (!s2.contains(".")) { int r = (int) result; et_input.setText(r + ""); } else et_input.setText(result + ""); } else { et_input.setText(""); } }}

Answer 1

你这问题提的，描述清楚点啊亲，贴一堆代码是让大家一行行找吗？