Android开发怎么实现计算器功能

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。

先上图看效果

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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