package com.hxx.jisuanqi;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity implements OnClickListener { Button yi, er, san, si, wu, liu, qi, ba, jiu, ling;// 定义属性数字0--9按钮 Button c, del;// 定义属性 归零,清除。 Button jia, jian, cheng, chu, deyu;// 定义属性 “加、减、乘、除”。 Button dian;// 定义属性 点。 EditText et1;// 定义属性 文本输入框 boolean clear_flag;//清空标识 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ling = (Button) findViewById(R.id.ling); yi = (Button) findViewById(R.id.yi); er = (Button) findViewById(R.id.er); san = (Button) findViewById(R.id.san); si = (Button) findViewById(R.id.si); wu = (Button) findViewById(R.id.wu); liu = (Button) findViewById(R.id.liu); qi = (Button) findViewById(R.id.qi); ba = (Button) findViewById(R.id.ba); jiu = (Button) findViewById(R.id.jiu); dian = (Button) findViewById(R.id.dian); jia = (Button) findViewById(R.id.jia); jian = (Button) findViewById(R.id.jian); cheng = (Button) findViewById(R.id.cheng); chu = (Button) findViewById(R.id.chu); deyu = (Button) findViewById(R.id.deyu); c = (Button) findViewById(R.id.c); del = (Button) findViewById(R.id.del); et1 = (EditText) findViewById(R.id.et1); ling.setOnClickListener(this); yi.setOnClickListener(this); er.setOnClickListener(this); san.setOnClickListener(this); si.setOnClickListener(this); wu.setOnClickListener(this); liu.setOnClickListener(this); qi.setOnClickListener(this); ba.setOnClickListener(this); jiu.setOnClickListener(this); dian.setOnClickListener(this); jia.setOnClickListener(this); jian.setOnClickListener(this); cheng.setOnClickListener(this); chu.setOnClickListener(this); c.setOnClickListener(this); del.setOnClickListener(this); et1.setOnClickListener(this); deyu.setOnClickListener(this); // 以上设置点击事件 } @Override public void onClick(View v) { String str=et1.getText().toString(); switch (v.getId()) { case R.id.ling: case R.id.yi: case R.id.er: case R.id.san: case R.id.si: case R.id.wu: case R.id.liu: case R.id.qi: case R.id.ba: case R.id.jiu: case R.id.dian: if(clear_flag){ clear_flag=false; et1.setText(""); } et1.setText(str+((Button)v).getText()); break; case R.id.jia: case R.id.jian: case R.id.cheng: case R.id.chu: if(clear_flag){ clear_flag=false; et1.setText(""); } et1.setText(str+""+((Button)v).getText()+""); break; case R.id.del: if(clear_flag){ clear_flag=false; et1.setText(""); } else if(str!=null&&!str.equals("")){ et1.setText(str.substring(0, str.length()-1)); } break; case R.id.c: clear_flag=false; et1.setText(""); break; case R.id.deyu: getResult(); break; } } //运算结果 private void getResult(){ String exp=et1.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 String op=exp.substring(exp.indexOf(" ")+1,exp.indexOf(" ")+2); String s2=exp.substring(exp.indexOf(" ")+3); 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; et1.setText(r+""); }else{ et1.setText(result+""); } } if(!s1.equals("")&&s2.equals("")){ et1.setText(exp); } if(s1.equals("")&&!s2.equals("")){ Double d1=Double.parseDouble(s1); 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; et1.setText(r+""); }else{ et1.setText(result+""); } }else{ et1.setText(exp); } }}
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