今天小编给大家分享一下Android开发怎么实现计算器功能的相关知识点,内容详细,逻辑清晰,相信大部分人都还太了解这方面的知识,所以分享这篇文章给大家参考一下,希望大家阅读完这篇文章后有所收获,下面我们一起来了解一下吧。
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比较简单,所以我就没怎么写注释,应该一看就能明白的
有不明白的可以发信问我
先贴MainActivity.java代码
package com.example.calculator; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity implements OnClickListener { Button b1, b2, b3, b4, b5, b6, b7, b8, b9, b0, bp, bs, bm, bd, bc, be; ImageView delete; TextView tv; EditText show; String showString = "", option = ""; int showfirst = 0; String exception = ""; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); b0 = (Button) findViewById(R.id.bt_0); b1 = (Button) findViewById(R.id.bt_1); b2 = (Button) findViewById(R.id.bt_2); b3 = (Button) findViewById(R.id.bt_3); b4 = (Button) findViewById(R.id.bt_4); b5 = (Button) findViewById(R.id.bt_5); b6 = (Button) findViewById(R.id.bt_6); b7 = (Button) findViewById(R.id.bt_7); b8 = (Button) findViewById(R.id.bt_8); b9 = (Button) findViewById(R.id.bt_9); bp = (Button) findViewById(R.id.bt_plus); bs = (Button) findViewById(R.id.bt_sub); bm = (Button) findViewById(R.id.bt_mutilate); bd = (Button) findViewById(R.id.bt_div); bc = (Button) findViewById(R.id.bt_c); be = (Button) findViewById(R.id.bt_equ); b1.setOnClickListener(this); b2.setOnClickListener(this); b3.setOnClickListener(this); b4.setOnClickListener(this); b5.setOnClickListener(this); b6.setOnClickListener(this); b7.setOnClickListener(this); b8.setOnClickListener(this); b9.setOnClickListener(this); b0.setOnClickListener(this); bp.setOnClickListener(this); bs.setOnClickListener(this); bm.setOnClickListener(this); bd.setOnClickListener(this); bc.setOnClickListener(this); be.setOnClickListener(this); show = (EditText) findViewById(R.id.et_show); delete = (ImageView) findViewById(R.id.iv_delete); delete.setOnClickListener(this); tv=(TextView) findViewById(R.id.author); tv.setOnClickListener(this); } @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; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.bt_0: showString += "0"; break; case R.id.bt_1: showString += "1"; break; case R.id.bt_2: showString += "2"; break; case R.id.bt_3: showString += "3"; break; case R.id.bt_4: showString += "4"; break; case R.id.bt_5: showString += "5"; break; case R.id.bt_6: showString += "6"; break; case R.id.bt_7: showString += "7"; break; case R.id.bt_8: showString += "8"; break; case R.id.bt_9: showString += "9"; break; case R.id.bt_plus: if (showString.equals("")) exception = "先输入数值哦"; else { showfirst = Integer.parseInt(showString); showString = ""; option = "+"; } break; case R.id.bt_sub: if (showString.equals("")) exception = "先输入数值哦"; else { showfirst = Integer.parseInt(showString); showString = ""; option = "-"; } break; case R.id.bt_mutilate: if (showString.equals("")) exception = "先输入数值哦"; else { showfirst = Integer.parseInt(showString); showString = ""; option = "*"; } break; case R.id.bt_div: if (showString.equals("")) exception = "先输入数值哦"; else { showfirst = Integer.parseInt(showString); showString = ""; option = "/"; } break; case R.id.bt_equ: if (option.equals("+")) showString = showfirst + Integer.parseInt(showString) + ""; else if (option.equals("-")) { showString = showfirst - Integer.parseInt(showString) + ""; } else if (option.equals("*")) { showString = showfirst * Integer.parseInt(showString) + ""; } else if (option.equals("/")) { if (showString.equals("0")) { exception = "除数不能为0!"; } else showString = showfirst / Integer.parseInt(showString) + ""; } break; case R.id.bt_c: showString = ""; break; case R.id.iv_delete: Toast.makeText(MainActivity.this, showString + "已被清空", Toast.LENGTH_SHORT).show(); showString = ""; break; case R.id.author: Toast.makeText(MainActivity.this, "郑明亮\n软件工程\nQQ:1072307340", Toast.LENGTH_SHORT).show(); break; default: break; } if (exception.equals("")) show.setText(showString); else { show.setText(exception); exception = ""; } // 设置文本框颜色; if (!show.getText().toString().equals("")) { delete.setBackgroundColor(R.drawable.delete_gray); } else { delete.setBackgroundResource(R.drawable.delete); } } }
再贴布局activity_main.xml:
我还写了一个drawable的xml,自己看吧
delete_and_deletegray.xml:
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