android的计算器

今天我闲着无聊，便想仿照Iphone的计算器自己写一个出来玩玩，于是就开动脑经，来场头脑风暴了！我拿什么了写呢？wp?这是个不错的选择，但是我最近在研究安卓的开发（求各位MSP不要烧我，我买不起MAC，你们要搞应该找昌豪，他有MAC，先烧死他再来烧我~~~）搞安卓开发其实还是蛮简单的！不就是监听，然后实现功能吗？跟WP的开发过程有点像  <Button  click = "clickaction"\>  在后台process中会自动生成触发函数 这是wp的开发过程，而安卓呢？在xml中定义<Button  android:id = "@+id\button"\>  然后在主函数里面写一个监听类，注意class ButtonListener implements OnClickListener 继承监听类，然后new一个 找到button的id 就可以设置它的监听了！好了废话不多说，让我们直接看安卓的界面吧！

有木有很像iphone的计算器啊？哈哈   不过我发现最后一行的权重在不同的手机上分配的不一样吧，这是我比较郁闷的地方，不知道有没有大牛能够帮小弟解决呢？

首先先上我们的xml代码

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <LinearLayout
        android:id="@+id/linear"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="5dp" >

        <TextView
            android:id="@+id/textView"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:gravity="right"
            android:hint="@string/insert"
             android:maxLength="26"
            android:textSize="40sp" />
    </LinearLayout>

    <TableLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/linear" >

        <TableRow
            android:layout_weight="1"
            android:paddingLeft="5dp"
            android:paddingRight="5dp" >

            <Button
                android:id="@+id/clear"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/clear" />

            <Button
                android:id="@+id/as"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/as" />

            <Button
                android:id="@+id/mod"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/mod" />

            <Button
                android:id="@+id/exc"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/exc" />
        </TableRow>

        <TableRow
            android:layout_weight="1"
            android:paddingLeft="5dp"
            android:paddingRight="5dp" >

            <Button
                android:id="@+id/button7"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/num7" />

            <Button
                android:id="@+id/button8"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/num8" />

            <Button
                android:id="@+id/button9"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/num9" />

            <Button
                android:id="@+id/rid"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/rid" />
        </TableRow>

        <TableRow
            android:layout_weight="1"
            android:paddingLeft="5dp"
            android:paddingRight="5dp" >

            <Button
                android:id="@+id/button4"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/num4" />

            <Button
                android:id="@+id/button5"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/num5" />

            <Button
                android:id="@+id/button6"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/num6" />

            <Button
                android:id="@+id/sub"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/sub" />
        </TableRow>

        <TableRow
            android:layout_weight="1"
            android:paddingLeft="5dp"
            android:paddingRight="5dp" >

            <Button
                android:id="@+id/button1"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/num1" />

            <Button
                android:id="@+id/button2"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/num2" />

            <Button
                android:id="@+id/button3"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/num3" />

            <Button
                android:id="@+id/add"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/add" />
        </TableRow>

        <TableRow
            android:layout_weight="1"
            android:paddingLeft="5dp"
            android:paddingRight="5dp" >

            <Button
                android:id="@+id/button0"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="2"
                android:background="@drawable/rectangle"
                android:text="@string/num0" />
              <Button
                android:id="@+id/rad"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/rad" />
              <Button
                android:id="@+id/result"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@drawable/rectangle"
                android:text="@string/result" />
        </TableRow>
    </TableLayout>

</RelativeLayout>

在这里我使用的一个线性布局给我得textview框定了一个100dp的范围，然后使用表格布局把控件放进去。

下面是string.xml 主要存放的一些字符串的资源

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">T0913_mycal</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="insert">0</string>
        <string name="num0">0</string>
          <string name="num1">1</string>
          <string name="num2">2</string>
            <string name="num3">3</string>
     <string name="num4">4</string>
     <string name="num5">5</string>
     <string name="num6">6</string>
     <string name="num7">7</string>
     <string name="num8">8</string>
     <string name="num9">9</string>
     <string name="exc">/</string>
         <string name="rid">*</string>
              <string name="sub">-</string>
              <string name="add">+</string>
                    <string name="result">=</string>
                          <string name="clear">C</string>
                           <string name="rad">.</string>
                            <string name="as">+/-</string>
                                    <string name="mod">%</string>
          

</resources>

在这里我把所有的内容全部做了链接，这也是一种软件工程的思考，希望大家多多使用这种方式。

然后大家看到我得控件都是圆角而且带边框的 这是在drawable中获取的效果！

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
     <solid android:color="#ff9d77"/>
    <padding android:left="7dp" android:top="7dp" android:right="7dp"
        android:bottom="7dp" />
  <stroke
                android:width="2dp"
                android:color="#dcdcdc" />
    <corners android:radius="8dp" />
</shape>

让每个控件的背景都是有这个xml就可以了

下面就是这个程序的实现代码了！

package com.example.t0913_mycal;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
private Button []num =new Button[10]; 
private Button rid,add,sub,result,exc,clear,as,mod,rad;
private TextView str ;
private int option = 0;//运算符状态
private boolean newdigital=true;//标记是否是新输入的数字
private double firstNum=0,secondNum=0;//两个相加的数
private double c;//表示取正负
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        rad =(Button)findViewById(R.id.rad);
        str = (TextView)findViewById(R.id.textView);
        rid =(Button)findViewById(R.id.rid);
        add = (Button)findViewById(R.id.add);
        sub = (Button)findViewById(R.id.sub);
        result = (Button)findViewById(R.id.result);
        exc = (Button)findViewById(R.id.exc);
        clear = (Button)findViewById(R.id.clear);
        as = (Button)findViewById(R.id.as);
        mod = (Button)findViewById(R.id.mod);
        num[0] = (Button)findViewById(R.id.button0);
        num[1] = (Button)findViewById(R.id.button1);
        num[2] = (Button)findViewById(R.id.button2);
        num[3] = (Button)findViewById(R.id.button3);
        num[4] = (Button)findViewById(R.id.button4);
        num[5] = (Button)findViewById(R.id.button5);
        num[6] = (Button)findViewById(R.id.button6);
        num[7] = (Button)findViewById(R.id.button7);
        num[8] = (Button)findViewById(R.id.button8);
        num[9] = (Button)findViewById(R.id.button9);
        ButtonListener listener = new ButtonListener();
        rad.setOnClickListener(listener);
        str.setOnClickListener(listener);
        rid.setOnClickListener(listener);
        add.setOnClickListener(listener);
        sub.setOnClickListener(listener);
        result.setOnClickListener(listener);
        exc.setOnClickListener(listener);
        clear.setOnClickListener(listener);
        as.setOnClickListener(listener);
        mod.setOnClickListener(listener);
        num[0].setOnClickListener(listener);
        num[1].setOnClickListener(listener);
        num[2].setOnClickListener(listener);
        num[3].setOnClickListener(listener);
        num[4].setOnClickListener(listener);
        num[5].setOnClickListener(listener);
        num[6].setOnClickListener(listener);
        num[7].setOnClickListener(listener);
        num[8].setOnClickListener(listener);
        num[9].setOnClickListener(listener);
    }
class ButtonListener implements OnClickListener{

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        Button btu = (Button)v;
        String s = str.getText().toString();//获取文本框显示的字符串
        String t = (String)btu.getText().toString();
        if(btu.getId() == R.id.button0 || btu.getId() == R.id.button1 || btu.getId() == R.id.button2
                ||btu.getId() == R.id.button3 || btu.getId() == R.id.button4 || btu.getId() == R.id.button5
                || btu.getId() == R.id.button6 ||btu.getId() == R.id.button7||btu.getId() == R.id.button8
                || btu.getId() == R.id.button9 ){
            if(newdigital){
                str.setText("");
                str.setText(t);
                newdigital = false;
            }
            else{
                str.setText(s+t);
                newdigital = false;
            }return;                     
        }
        if(btu.getId()==R.id.as)//改变数的正负性
        {
            if(s.length() == 0){
                firstNum = 0;
                secondNum = 0;
                newdigital = true;
                option = 0;
                return ;
            }
            else if (s !=""){
                c=Double.parseDouble(s);
                str.setText(String.valueOf(-c));
                return;
            }
        }
        if(btu.getId() == R.id.add){
            firstNum = Double.parseDouble(s);
            option=1;
            newdigital = true;
            return;
        }
        if(btu.getId() == R.id.sub){
            firstNum = Double.parseDouble(s);
            option = 2;
            newdigital = true;
            return;
        }
        if(btu.getId() == R.id.rid){
            firstNum = Double.parseDouble(s);
            option = 3;
            newdigital = true;
            return;
        }
        if(btu.getId() == R.id.exc){
            firstNum = Double.parseDouble(s);
            option = 4;
            newdigital = true;
            return;
        }
        if(btu.getId() == R.id.mod){
            firstNum = Double.parseDouble(s);
            option = 5;
            newdigital = true;
            return;
        }
        if(btu.getId() == R.id.clear){
            firstNum = 0;
            secondNum = 0;
            newdigital = true;
            option = 0;
            str.setText("");
            return;
        }
        if(btu.getId() == R.id.rad){
                if(s.length() == 0)
                {
                    str.setText("0.");
                    newdigital=false;
                }
                else if(s.indexOf(".") == -1)
                {
                     str.setText(s+".");    
                }
            return;
        }
        if(btu.getId() == R.id.result){
            secondNum=Double.parseDouble(s);
            switch(option)
            {
            case 1:
                str.setText(String.valueOf(firstNum+secondNum));break;
            case 2:
                str.setText(String.valueOf(firstNum-secondNum));break;
            case 3:
                str.setText(String.valueOf(firstNum*secondNum));break;
            case 4:
            {
                if(secondNum!=0){
                        str.setText(String.valueOf(firstNum/secondNum));}
                else
                    {
                    Toast.makeText(MainActivity.this, "除数不能为0！", Toast.LENGTH_SHORT).show();
                    str.setText("");
                    firstNum=0;
                    secondNum=0;
                    option=0;
                    newdigital=true;
                    return;
                    }
                break;
            }
            case 5:
                str.setText(String.valueOf(firstNum%secondNum));
                break;
            }            
            return;
        }
    }
    
}
    
    @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;
    }

}

  大功告成了，我的计算器其实非常之简单！望各位多多指教！