安卓计算器 简单代码

xml代码

<?xml version="1.0" encoding="utf-8"?>
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:rowCount="6"
    android:columnCount="4"

    >

    <EditText

        android:layout_columnSpan="4"
        android:layout_gravity="fill_horizontal"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:editable="false"
        android:gravity="right|center_vertical"
        android:id="@+id/et"
        android:textSize="30sp"
        />
    <Button
        android:text="清除"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:textSize="20sp"
        android:layout_row="1"
        android:layout_column="1"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:background="#900"
        android:id="@+id/clear"/>

    <Button
        android:text="后退"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:textSize="20sp"
        android:layout_row="1"
        android:layout_column="0"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/goback"/>

    <Button
        android:text="/"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:textSize="20sp"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/chu"/>


    <Button
        android:text="x"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/cheng"/>

    <Button
        android:text="7"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/bt_7"/>

    <Button
        android:text="8"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/bt_8"/>

    <Button
        android:text="9"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/bt_9"/>

    <Button
        android:text="-"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/jian"/>

    <Button
        android:text="4"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/bt_4"/>

    <Button
        android:text="5"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/bt_5"/>

    <Button
        android:text="6"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/bt_6"/>

    <Button
        android:text="+"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/jia"/>

    <Button
        android:text="1"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/bt_1"/>

    <Button
        android:text="2"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/bt_2"/>

    <Button
        android:text="3"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/bt_3"/>

    <Button
        android:text="="
        android:layout_rowSpan="2"
        android:layout_gravity="fill_vertical"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:background="#900"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/deng"/>

    <Button
        android:text="0"
        android:layout_columnSpan="2"
        android:layout_gravity="fill_horizontal"
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="#900"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:id="@+id/bt_0"
        />

    <Button
        android:text="."
        android:layout_columnWeight="1"
        android:layout_rowWeight="1"
        android:background="#900"
        android:layout_marginRight="3dp"
        android:layout_marginLeft="3dp"
        android:textSize="20sp"
        android:layout_marginTop="3dp"
        android:layout_marginBottom="3dp"
        android:onClick="onClick"
        android:id="@+id/dian"/>



</GridLayout>

Java代码

package com.hanqi.test5;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

/**
 * Created by Administrator on 2016/3/27.
 */
public class jisuanqi extends Activity implements View.OnClickListener {

    EditText et;
    Button clear;
    Button goback;
    Button bt_7;
    Button bt_8;
    Button bt_9;
    Button bt_6;
    Button bt_1;
    Button bt_2;
    Button bt_3;
    Button bt_4;
    Button bt_5;
    Button jia;
    Button jian;
    Button cheng;
    Button chu;
    Button bt_0;
    Button dian;
    Button deng;

    //存储显示的内容
    //操作字符串的工具类
    //实例化
    private StringBuilder str_show = new StringBuilder();

    //当前运算符的 id
    private int id_yunsf = 0;

    //运算符前面的数值  包装类
    private Double numner_1;
    //运算符后面的数值
    private Double numner_2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.gridlayout);


        et =(EditText)findViewById(R.id.et);
        clear =(Button)findViewById(R.id.clear);
        goback =(Button)findViewById(R.id.goback);
        bt_7 =(Button)findViewById(R.id.bt_7);
        bt_8 =(Button)findViewById(R.id.bt_8);
        bt_9 =(Button)findViewById(R.id.bt_9);
        bt_6 =(Button)findViewById(R.id.bt_6);
        bt_1 =(Button)findViewById(R.id.bt_1);
        bt_2 =(Button)findViewById(R.id.bt_2);
        bt_3 =(Button)findViewById(R.id.bt_3);
        bt_4 =(Button)findViewById(R.id.bt_4);
        bt_5 =(Button)findViewById(R.id.bt_5);
        jia =(Button)findViewById(R.id.jia);
        jian =(Button)findViewById(R.id.jian);
        cheng =(Button)findViewById(R.id.cheng);
        chu =(Button)findViewById(R.id.chu);
        bt_0 =(Button)findViewById(R.id.bt_0);
        dian =(Button)findViewById(R.id.dian);
        deng =(Button)findViewById(R.id.deng);

        clear.setOnClickListener(this);
        goback.setOnClickListener(this);
        bt_0.setOnClickListener(this);
        bt_1.setOnClickListener(this);
        bt_2.setOnClickListener(this);
        bt_3.setOnClickListener(this);
        bt_4.setOnClickListener(this);
        bt_5.setOnClickListener(this);
        bt_6.setOnClickListener(this);
        bt_7.setOnClickListener(this);
        bt_8.setOnClickListener(this);
        bt_9.setOnClickListener(this);
        jia.setOnClickListener(this);
        jian.setOnClickListener(this);
        cheng.setOnClickListener(this);
        chu.setOnClickListener(this);
        deng.setOnClickListener(this);
        dian.setOnClickListener(this);

    }

    //View 事件源组件
    public void onClick(View v)
    {
        //强转

        Button bt = (Button)v;

        int id = bt.getId();

        switch (id)
        {

            case R.id.clear:

                //重新实例化（清除）
                str_show = new StringBuilder();

                //设置显示内容
                et.setText(str_show);

                numner_1 = null;
                numner_2 = null;

                id_yunsf = 0;

            break;

            case R.id.goback:

                if (str_show.length()>0)
                //删除最后一个字符
                str_show.deleteCharAt(str_show.length() - 1);


                        et.setText(str_show);

                break;

            case R.id.bt_0:
            case R.id.bt_1:
            case R.id.bt_2:
            case R.id.bt_3:
            case R.id.bt_4:
            case R.id.bt_5:
            case R.id.bt_6:
            case R.id.bt_7:
            case R.id.bt_8:
            case R.id.bt_9:

                if (id != R.id.bt_0
                || (id == R.id.bt_0 && !str_show.toString().equals("0"))){

                str_show.append(bt.getText());
                }


                et.setText(str_show);

                break;

            case R.id.dian:

                et.setText(str_show);

                break;

            case R.id.deng:
            case R.id.jia:
            case R.id.jian:
            case R.id.cheng:
            case R.id.chu:

                if (numner_1 == null)
                {
                  if (str_show.length()>0)
                  {
                      numner_1 = new Double(str_show.toString());

                      id_yunsf = bt.getId();

                      //重新实例化（清除）
                      str_show = new StringBuilder();

                      //设置显示内容
                      et.setText(str_show);


                  }

                }
                else //计算
                {

                    if (str_show.length()>0)
                    {
                        //把字符串转换成Double  赋值
                        numner_2 = new Double(str_show.toString());
                    }

                    //判断运算符
                    switch (id_yunsf)
                    {
                        case R.id.jia:

                            //运算

                         numner_1 = numner_1.doubleValue() + numner_2.byteValue();

                            break;

                        case R.id.jian:

                            //运算

                            numner_1 = numner_1.doubleValue() - numner_2.byteValue();

                            break;

                        case R.id.cheng:

                            //运算

                            numner_1 = numner_1.doubleValue() * numner_2.byteValue();

                            break;

                        case R.id.chu:

                            if (numner_2 != 0) {
                                //运算

                                numner_1 = numner_1.doubleValue() / numner_2.byteValue();
                            }
                            else
                            {
                                Toast.makeText(this,"不能除0",Toast.LENGTH_LONG).show();


                            }

                            break;


                    }

                    //运算符

                    id_yunsf = bt.getId();

                    //显示当前运算结果
                    et.setText(numner_1.toString());

                    //清空
                    str_show = new StringBuilder();

                }
                break;







        }
    }



}