Android计算器简单逻辑达成
发布时间：2021-12-11 18:10:07 所属栏目：教程 来源：互联网
导读：package com.example.androidlessontwo; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity extend
|
package com.example.androidlessontwo; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity extends Activity { private Button[] buttonNum=new Button[11]; private Button[] buttonComand=new Button[5]; private TextView input=null; private TextView rl=null; private Button buttonClear=null; private boolean firstFlag=true; private double result=0.0; private String lastCommand; public void MyCalculator() { result = 0.0; firstFlag=true; lastCommand="="; } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); buttonNum[0]=(Button) findViewById(R.id.num0); buttonNum[1]=(Button) findViewById(R.id.num1); buttonNum[2]=(Button) findViewById(R.id.num2); buttonNum[3]=(Button) findViewById(R.id.num3); buttonNum[4]=(Button) findViewById(R.id.num4); buttonNum[5]=(Button) findViewById(R.id.num5); buttonNum[6]=(Button) findViewById(R.id.num6); buttonNum[7]=(Button) findViewById(R.id.num7); buttonNum[8]=(Button) findViewById(R.id.num8); buttonNum[9]=(Button) findViewById(R.id.num9); buttonNum[10]=(Button) findViewById(R.id.point); buttonComand[0]=(Button) findViewById(R.id.add); buttonComand[1]=(Button) findViewById(R.id.sub); buttonComand[2]=(Button) findViewById(R.id.ride); buttonComand[3]=(Button) findViewById(R.id.divide); buttonComand[4]=(Button) findViewById(R.id.equal); input=(TextView) findViewById(R.id.input); rl =(TextView) findViewById(R.id.rl); buttonClear=(Button) findViewById(R.id.clean); NumberAction na= new NumberAction(); CommandAction ca=new CommandAction(); for(Button bc:buttonComand) { bc.setOnClickListener(ca); } for(Button bc:buttonNum) { bc.setOnClickListener(na); } buttonClear.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { MyCalculator(); rl.setText("0.0"); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } private class NumberAction implements Button.OnClickListener { @Override public void onClick(View view) { Button btn = (Button)view; String inputTemp =btn.getText().toString();//6 input.setText(input.getText().toString()+inputTemp); double numtemp = 0; switch(btn.getId()) { case R.id.num0: { if(firstFlag) { result=result*10+0; firstFlag=false; } else numtemp=numtemp*10+0; break; } case R.id.num1: { if(firstFlag) { result=result*10+1; firstFlag=false; } else numtemp=numtemp*10+1; break; } case R.id.num2: { if(firstFlag) { result=result*10+2; firstFlag=false; } else numtemp=numtemp*10+2; break; } case R.id.num3: { if(firstFlag) { result=result*10+3; firstFlag=false; } else numtemp=numtemp*10+3; break; } case R.id.num4: { if(firstFlag) { result=result*10+4; firstFlag=false; } else numtemp=numtemp*10+4; break; } case R.id.num5: { if(firstFlag) { result=result*10+5; firstFlag=false; } else numtemp=numtemp*10+5; break; } case R.id.num6: { if(firstFlag) { result=result*10+6; firstFlag=false; } else { numtemp=numtemp*10+6; calculate(numtemp); } break; } case R.id.num7: { if(firstFlag) { result=result*10+7; firstFlag=false; } else { numtemp=numtemp*10+7; calculate(numtemp); } break; } case R.id.num8: { if(firstFlag) { result=result*10+8; { result=result*10+8; firstFlag=false; } } else { numtemp=numtemp*10+8; calculate(numtemp); } break; } case R.id.num9: { if(firstFlag) { result=result*10+9; firstFlag=false; } else { numtemp=numtemp*10+9; calculate(numtemp); } break; } } } } private class CommandAction implements Button.OnClickListener { @Override public void onClick(View v) { Button btn=(Button)v; String inputCommand=(String)btn.getText(); switch(btn.getId()) { case R.id.add: { lastCommand="+"; break; } case R.id.sub: { lastCommand="-"; break; } case R.id.ride: { lastCommand="*"; break; } case R.id.divide: { lastCommand="/"; break; } case R.id.equal: { lastCommand="="; input.setText(""); rl.setText(String.valueOf(result)); return ; } } input.setText(input.getText()+inputCommand); } } private void calculate(double x) { if(lastCommand.equals("+")) { result += x; } if(lastCommand.equals("-")) { result -= x; } if(lastCommand.equals("*")) { result *= x; } if(lastCommand.equals("/")) { result /= x; } } }  （编辑：东莞站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
