Android简单计算器（已消除常见bug）

xml文件：

java文件：

package com.next.calculator1;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity {private TextView textView;private String str,num1,num2;private double result;private boolean addNum;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);textView = (TextView) findViewById(R.id.textView);addNum = true;}public void onClick(View v){str = (String) textView.getText();switch (v.getId()) {case R.id.btn_cle:textView.setText("");break;case R.id.btn_del:if(!str.equals("") && str != null){textView.setText(str.substring(0, str.length()-1));}break;case R.id.btn_equ:if(str.contains("+")){getResult(num1, num2, "+");}else if(str.contains("-")){getResult(num1, num2, "-");}else if(str.contains("×")){getResult(num1, num2, "×");}else if(str.contains("÷")){getResult(num1, num2, "÷");}else {return;}break;case R.id.btn_add:case R.id.btn_sub:case R.id.btn_mul:case R.id.btn_div:if (str.contains("+")||str.contains("-")||str.contains("×")||str.contains("÷"))return;elsetextView.setText(str+((Button)v).getText());if(!addNum)addNum = true;break;default:if (addNum) {textView.setText(str+((Button)v).getText());}else{textView.setText(((Button)v).getText());addNum = true;}break;}}private void getResult(String num1,String num2,String op) {num1 = str.substring(0,str.indexOf(op));num2 = str.substring(str.indexOf(op)+1);try {double n1 = Double.parseDouble(num1);double n2 = Double.parseDouble(num2);if (op.equals("+")) {result = n1+n2;}else if(op.equals("-")){result = n1-n2;}else if(op.equals("×")){result = n1*n2;}else if(op.equals("÷")){result = n1/n2;}else {return;}String r = result+"";if(r.contains(".")&&r.substring(r.length()-1).equals("0")){r = r.substring(0,r.indexOf("."));}textView.setText(r);addNum = false;} catch (Exception e) {return;}}}

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