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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：