Android自做小实验之 计算器
16lz
2021-01-23
自己做的计算器并不是很好。
activity_main.xml 布局文件里的代码为：
MainActivity.class里的代码为：
package com.example.administrator.calculator;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.widget.Button;import android.widget.EditText;public class MainActivity extends ActionBarActivity implements View.OnClickListener { StringBuffer sbff = new StringBuffer(); int a=0,b=0,c=0,d=0; private Button bt1; private Button bt2; private Button bt3; private Button bt4; private Button bt5; private Button bt6; private Button bt7; private Button bt8; private Button bt9; private Button bt10; private Button bt11; private Button bt12; private Button bt13; private Button bt14; private Button bt15; private Button bt16; private EditText editText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化 editText = (EditText) findViewById(R.id.abc); bt1 = (Button) findViewById(R.id.one); bt2 = (Button) findViewById(R.id.two); bt3 = (Button) findViewById(R.id.three); bt4 = (Button) findViewById(R.id.four); bt5 = (Button) findViewById(R.id.five); bt6 = (Button) findViewById(R.id.six); bt7 = (Button) findViewById(R.id.seven); bt8 = (Button) findViewById(R.id.eight); bt9 = (Button) findViewById(R.id.nine); bt10 = (Button) findViewById(R.id.zero); bt11 = (Button) findViewById(R.id.jia); bt12 = (Button) findViewById(R.id.jian); bt13 = (Button) findViewById(R.id.cheng); bt14 = (Button) findViewById(R.id.chu); bt15 = (Button) findViewById(R.id.dengyu); bt16 = (Button) findViewById(R.id.c); //监听 bt1.setOnClickListener(this); bt2.setOnClickListener(this); bt3.setOnClickListener(this); bt4.setOnClickListener(this); bt5.setOnClickListener(this); bt6.setOnClickListener(this); bt7.setOnClickListener(this); bt8.setOnClickListener(this); bt9.setOnClickListener(this); bt10.setOnClickListener(this); bt11.setOnClickListener(this); bt12.setOnClickListener(this); bt13.setOnClickListener(this); bt14.setOnClickListener(this); bt15.setOnClickListener(this); bt16.setOnClickListener(this); } @Override public void onClick(View v) { Button bt = (Button) v; switch (v.getId()) { case R.id.one: case R.id.two: case R.id.three: case R.id.four: case R.id.five: case R.id.six: case R.id.seven: case R.id.eight: case R.id.nine: case R.id.zero: case R.id.jia: case R.id.jian: case R.id.cheng: case R.id.chu: sbff.append(bt.getText()); editText.setText(sbff.toString()); break; case R.id.dengyu: String s = sbff.toString(); a = s.indexOf("+"); b = s.indexOf("-"); c = s.indexOf("*"); d = s.indexOf("/"); if(!(a==-1)){ String m[] = s.split("\\+"); String[] r =m[0].split("\\."); if(r[0]==null){ a = Integer.valueOf(m[0]); b = Integer.valueOf(m[1]); c = a+b; s = c+""; editText.setText(s); sbff = new StringBuffer(); sbff.append(s); }else { double a = Double.valueOf(m[0]); b = Integer.valueOf(m[1]); double c = a+b; s = c+""; editText.setText(s); sbff = new StringBuffer(); sbff.append(s); } }else if(!(b==-1)){ String m[] = s.split("-"); String[] r =m[0].split("\\."); if(r[0]==null){ a = Integer.valueOf(m[0]); b = Integer.valueOf(m[1]); c = a-b; s = c+""; editText.setText(s); sbff = new StringBuffer(); sbff.append(s); }else { double a = Double.valueOf(m[0]); b = Integer.valueOf(m[1]); double c = a-b; s = c+""; editText.setText(s); sbff = new StringBuffer(); sbff.append(s); } }else if(!(c==-1)){ String m[] = s.split("\\*"); String[] r =m[0].split("\\."); if(r[0]==null){ a = Integer.valueOf(m[0]); b = Integer.valueOf(m[1]); c = a*b; s = c+""; editText.setText(s); sbff = new StringBuffer(); sbff.append(s); }else { double a = Double.valueOf(m[0]); b = Integer.valueOf(m[1]); double c = a*b; s = c+""; editText.setText(s); sbff = new StringBuffer(); sbff.append(s); } }else if(!(d==-1)){ String m[] = s.split("/"); String[] r =m[0].split("\\."); if(r[0]==null){ a = Integer.valueOf(m[0]); b = Integer.valueOf(m[1]); c = a/b; s = c+""; editText.setText(s); sbff = new StringBuffer(); sbff.append(s); }else { double a = Double.valueOf(m[0]); b = Integer.valueOf(m[1]); double c = a/b; s = c+""; editText.setText(s); sbff = new StringBuffer(); sbff.append(s); } }// editText.setText(null); break; case R.id.c: String s1 = sbff.toString(); a = s1.length(); if(a==1){ sbff = new StringBuffer(); editText.setText("sb不能再删了"); }else if(a==0) { }else{ s1 = s1.substring(0,a-1); sbff = new StringBuffer(); sbff.append(s1); editText.setText(sbff); } break; } }}更多相关文章
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