android应用开发实践二----控件学习的计算器实践

代码语言：javascript

复制

<RelativeLayout  
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
   >

   <EditText
       android:id="@+id/text"
       android:layout_width="fill_parent"
       android:layout_height="170dip"
       android:background="@drawable/hint"
       android:inputType="number"
       android:maxLines="4"
       android:textSize="60sp"
       android:gravity="center"
       android:paddingLeft="18dp"
       android:paddingRight="24dp"
       android:textColor="#00ff7f" />

    <Button
      android:id="@+id/MyButon0"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_below="@id/text" 
      android:textColor="#FF0000"
      android:textSize="60sp"
      android:text="@string/zero"
    />
      <Button
      android:id="@+id/MyButon1"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_below="@id/text" 
      android:layout_toRightOf="@id/MyButon0"
      android:textColor="#FF0000"
      android:text="@string/one"
      android:textSize="60sp"
           />
          <Button
      android:id="@+id/MyButon2"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_below="@id/text" 
      android:layout_toRightOf="@id/MyButon1"
      android:textColor="#FF0000"
      android:text="@string/two"
      android:textSize="60sp"
           />
       <Button
      android:id="@+id/MyButon3"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_below="@id/text" 
      android:layout_toRightOf="@id/MyButon2"
      android:textColor="#FF0000"
      android:text="@string/three"
      android:textSize="60sp"
           />
            <Button
      android:id="@+id/MyButon4"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_below="@id/text" 
      android:layout_toRightOf="@id/MyButon3"
      android:textColor="#FF0000"
      android:text="@string/four"
      android:textSize="60sp"
           />
              <Button
      android:id="@+id/MyButon5"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_below="@id/MyButon0" 
      android:textColor="#FF0000"
      android:text="@string/five"
      android:textSize="60sp"
           />
               <Button
      android:id="@+id/MyButon6"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_toRightOf="@id/MyButon5"
      android:layout_below="@id/MyButon1" 
      android:textColor="#FF0000"
      android:text="@string/six"
      android:textSize="60sp"
           />
          <Button
      android:id="@+id/MyButon7"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_toRightOf="@id/MyButon6"
      android:layout_below="@id/MyButon2" 
      android:textColor="#FF0000"
      android:text="@string/seven"
      android:textSize="60sp"
           />
       <Button
      android:id="@+id/MyButon8"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_toRightOf="@id/MyButon7"
      android:layout_below="@id/MyButon3" 
      android:textColor="#FF0000"
      android:text="@string/eight"
      android:textSize="60sp"
           />
           <Button
      android:id="@+id/MyButon9"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_toRightOf="@id/MyButon8"
      android:layout_below="@id/MyButon3" 
      android:textColor="#FF0000"
      android:text="@string/nine"
      android:textSize="60sp"
           />
                  <Button
      android:id="@+id/ADD"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_below="@id/MyButon5" 
      android:textColor="#FF0000"
      android:text="@string/add"
      android:textSize="60sp"
           />
               <Button
      android:id="@+id/SUB"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_toRightOf="@id/ADD"
      android:layout_below="@id/MyButon6" 
      android:textColor="#FF0000"
      android:text="@string/sub"
      android:textSize="60sp"
           />
           <Button
      android:id="@+id/MULTI"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_toRightOf="@id/SUB"
      android:layout_below="@id/MyButon7" 
      android:textColor="#FF0000"
      android:text="@string/multi"
      android:textSize="60sp"
           />
                 <Button
      android:id="@+id/DIV"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_toRightOf="@id/MULTI"
      android:layout_below="@id/MyButon8" 
      android:textColor="#FF0000"
      android:text="@string/div"
      android:textSize="60sp"
           />
                         <Button
      android:id="@+id/EQUE"
      android:layout_width="71dip"
      android:layout_height="wrap_content"
      android:layout_toRightOf="@id/DIV"
      android:layout_below="@id/MyButon9" 
      android:textColor="#FF0000"
      android:text="@string/eque"
      android:textSize="60sp"
           />
     
       <Button
         android:id="@+id/opposite"
         android:layout_width="71dip"
         android:layout_height="90dip"
         android:layout_below="@id/ADD" 
         android:layout_alignParentLeft="true"
         android:text="@string/opposite"
         android:textColor="#FF0000"
         android:textSize="32sp" />
         <Button
         android:id="@+id/dot"
         android:layout_width="71dip"
         android:layout_height="90dip"
         android:layout_below="@id/SUB" 
          android:layout_toRightOf="@id/opposite"
         android:text="@string/dot"
         android:textColor="#FF0000"
         android:textSize="30sp" 
         android:gravity="center"
         />
     <Button
         android:id="@+id/CRL"
          android:layout_width="71dip"
         android:layout_height="90dip"
         android:layout_below="@id/MULTI" 
          android:layout_toRightOf="@id/dot"
         android:text="@string/clear"
         android:textColor="#0000FF"
         android:textSize="30sp" />

                <Button
                    android:id="@+id/OFF"
                     android:layout_width="71dip"
                     android:layout_height="90dip"
                    android:layout_below="@id/DIV" 
                    android:layout_toRightOf="@id/CRL"
                    android:text="@string/off"
                    android:textColor="#000000"
                    android:textSize="25sp" />

                <Button
                    android:id="@+id/ON"
                    android:layout_width="71dip"
                    android:layout_height="90dip"
                    android:layout_below="@id/EQUE" 
                    android:layout_toRightOf="@id/OFF"
                    android:text="@string/on"
                    android:textColor="#7fffd4"
                    android:textSize="30sp" />

              
                   
</RelativeLayout >

启动文件

代码语言：javascript

复制

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.example.calculator"

android:versionCode="1"

android:versionName="1.0" >
&lt;uses-sdk
    android:minSdkVersion=&#34;8&#34;
    android:targetSdkVersion=&#34;19&#34; /&gt;
&lt;supports-screens
    android:smallScreens=&#34;true&#34; 
    android:normalScreens=&#34;true&#34; 
    android:largeScreens=&#34;true&#34; 
    android:anyDensity=&#34;true&#34;
/&gt;
  &lt;application
    android:allowBackup=&#34;true&#34;
    android:icon=&#34;@drawable/calculate_icon&#34;
    android:label=&#34;@string/app_name&#34;
    android:theme=&#34;@style/AppTheme&#34; &gt;
    &lt;activity
        android:name=&#34;com.example.calculator.MainActivity&#34;
        android:label=&#34;@string/app_name&#34; 
        android:screenOrientation=&#34;portrait&#34;
        android:windowSoftInputMode=&#34;stateAlwaysHidden&#34;
        &gt;
                
        &lt;intent-filter&gt;
            &lt;action android:name=&#34;android.intent.action.MAIN&#34; /&gt;

            &lt;category android:name=&#34;android.intent.category.LAUNCHER&#34; /&gt;
        &lt;/intent-filter&gt;
    &lt;/activity&gt;
&lt;/application&gt;

</manifest>

资源文件string.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="log">Hfl stduio for test\t</string>
<string name="app_name">Calculator</string>
<string name="hello_world">Hello world!</string>
<string name="action_settings">Settings</string>
<string name="tips">please input nuber:</string>
<string name="opposite">+/-</string>
<string name="dot">.</string>
<string name="zero">0</string>
<string name="one">1</string>
<string name="two">2</string>
<string name="three">3</string>
<string name="four">4</string>
<string name="five">5</string>
<string name="six">6</string>
<string name="seven">7</string>
<string name="eight">8</string>
<string name="nine">9</string>
<string name="add">+</string>
<string name="sub">-</string>
<string name="multi">*</string>
<string name="div">/</string>
<string name="eque">=</string>
<string name="clear">C</string>
<string name="on">ON</string>
<string name="off">OFF</string>
</resources>

java源代码

代码语言：javascript

复制

package com.example.calculator;
import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.widget.*;

import android.text.InputType;

import android.view.View;

import android.view.View.OnClickListener;

public class MainActivity extends ActionBarActivity {

EditText edit;

private int option = 0;//运算符状态

private boolean newdigital=false;//标记是否是新输入的数字

private double a=0,b=0;//两个相加的数

private boolean flag=false;

private int First=0;

private int dot=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    edit=(EditText)findViewById(R.id.text); 
    edit.setInputType(InputType.TYPE_NULL);
    Button bt0=(Button)findViewById(R.id.MyButon0);
	Button bt1=(Button)findViewById(R.id.MyButon1);
	Button bt2=(Button)findViewById(R.id.MyButon2);
	Button bt3=(Button)findViewById(R.id.MyButon3);
    Button bt4=(Button)findViewById(R.id.MyButon4);
	Button bt5=(Button)findViewById(R.id.MyButon5);
	Button bt6=(Button)findViewById(R.id.MyButon6);
	Button bt7=(Button)findViewById(R.id.MyButon7);
    Button bt8=(Button)findViewById(R.id.MyButon8);
	Button bt9=(Button)findViewById(R.id.MyButon9);
	Button add=(Button)findViewById(R.id.ADD);
	Button sub=(Button)findViewById(R.id.SUB);
	Button multi=(Button)findViewById(R.id.MULTI);
	Button opp=(Button)findViewById(R.id.opposite);
	Button dot=(Button)findViewById(R.id.dot);
	Button div=(Button)findViewById(R.id.DIV);
	Button eque=(Button)findViewById(R.id.EQUE);
	Button crl=(Button)findViewById(R.id.CRL);
	Button on=(Button)findViewById(R.id.ON);
	Button off=(Button)findViewById(R.id.OFF);
    bt0.setOnClickListener(listener);
    bt1.setOnClickListener(listener);
    bt2.setOnClickListener(listener);
    bt3.setOnClickListener(listener);
    bt4.setOnClickListener(listener);
    bt5.setOnClickListener(listener);
    bt6.setOnClickListener(listener);
    bt7.setOnClickListener(listener);
    bt8.setOnClickListener(listener);
    bt9.setOnClickListener(listener);
    add.setOnClickListener(listener);
    sub.setOnClickListener(listener);
    multi.setOnClickListener(listener);
    div.setOnClickListener(listener);
    eque.setOnClickListener(listener);
    crl.setOnClickListener(listener);
    on.setOnClickListener(listener);
    off.setOnClickListener(listener);
    opp.setOnClickListener(listener);
    dot.setOnClickListener(listener);
}
private OnClickListener listener =new OnClickListener()
{
	
	@Override
	public void onClick(View v) {
		String s;
		
		s = edit.getText().toString();
		if((s.equals(&#34;0&#34;)==true))
		{
			newdigital=true;
		   
		}

		if(First&gt;8)
		{
			edit.setText(&#34;FFFFFFFFF&#34;);
			newdigital=true;
			First=0;
			dot=0;
			flag=false;
			return;
		}
	
		Button btx=(Button)v;
	
		
		switch(btx.getId())
		{
			
			case R.id.ON:
				
				edit.setText(&#34;0&#34;);
				First=0;
				flag=false;
				dot=0;
				
				break;
			case R.id.OFF:
				edit.setText(&#34;FFFFFFFFF&#34;);
				First=0;
				flag=false;
				dot=0;
				newdigital=true;
				break;
			case R.id.CRL:
				edit.setText(&#34;0&#34;); 
				First=0;
				dot=0;
				flag=false;
				break;
			case R.id.opposite:
				if(s.length()==0)
				{
					a=0;
					b=0;
					option=0;
					newdigital=true;
					edit.setText(&#34;&#34;);
					
					flag=false;
					dot=0;
					break;
				}
				else if(s!=&#34;&#34;)
					{
					a=Double.parseDouble(s);
					edit.setText(String.valueOf(-a));
					newdigital=true;
					
					flag=false;
					dot=0;
				 	break;
					}
			case R.id.dot:
				
				if((s.equals(&#34;0&#34;)==true&amp;&amp;newdigital)||(First==0))
				{
					flag=true;
				}
				if(newdigital)
				{
					s=&#34;&#34;;
					newdigital=false;
				}
				if(dot==0)
				{
				   dot++;
				   if(flag)
					   edit.setText(&#34;0.&#34;);
				    else
					   edit.setText(s+&#34;.&#34;);
									   
				}
				First++;
				
				break;
			
			case R.id.MyButon0:
				if(newdigital)
				{
					s=&#34;&#34;;
					newdigital=false;
				}
				edit.setText(s+&#34;0&#34;); 
				First++;
				break;
			case R.id.MyButon1:
				if(newdigital)
				{
					s=&#34;&#34;;
					newdigital=false;
				}
				edit.setText(s+&#34;1&#34;); 	
				First++;
				break;
			case R.id.MyButon2:
				if(newdigital)
				{
					s=&#34;&#34;;
					newdigital=false;
				}
				edit.setText(s+&#34;2&#34;); 
				First++;
				break;
			case R.id.MyButon3:
				if(newdigital)
				{
					s=&#34;&#34;;
					newdigital=false;
				}
				edit.setText(s+&#34;3&#34;); 	
				First++;
				break;
			case R.id.MyButon4:
				if(newdigital)
				{
					s=&#34;&#34;;
					newdigital=false;
					
				}
				edit.setText(s+&#34;4&#34;); 	
				First++;
				break;
			case R.id.MyButon5:
				if(newdigital)
				{
					s=&#34;&#34;;
					newdigital=false;
				}
				edit.setText(s+&#34;5&#34;); 	
				First++;
				break;
			case R.id.MyButon6:
				if(newdigital)
				{
					s=&#34;&#34;;
					newdigital=false;
				}
				edit.setText(s+&#34;6&#34;); 	
				First++;
				break;
			case R.id.MyButon7:
				if(newdigital)
				{
					s=&#34;&#34;;
					newdigital=false;
				}
				edit.setText(s+&#34;7&#34;); 	
				First++;
				break;
			case R.id.MyButon8:
				if(newdigital)
				{
					s=&#34;&#34;;
					newdigital=false;
				}
				edit.setText(s+&#34;8&#34;); 	
				First++;
				break;
			case R.id.MyButon9:
				if(newdigital)
				{
					s=&#34;&#34;;
					newdigital=false;
				}
				edit.setText(s+&#34;9&#34;); 	
				First++;
				break;
			case R.id.ADD:
			  
			   if(s.equals(&#34;&#34;)==true||s.equals(&#34;FFFFFFFFF&#34;)==true)
			   {
				   s=&#34;0&#34;;
			   }
				a=Double.parseDouble(s);
				s=&#34;&#34;;
				option=1;
				edit.setText(&#34;&#34;); 
				flag=false;
				First=0;
				dot=0;
			
				
				break;
			case R.id.SUB:
				 if(s.equals(&#34;&#34;)==true||s.equals(&#34;FFFFFFFFF&#34;)==true)
				   {
					   s=&#34;0&#34;;
				   }
				a=Double.parseDouble(s);
				s=&#34;&#34;;
				option=2;
				edit.setText(&#34;&#34;); 
				First=0;
				flag=false;
			
				dot=0;
			    break;
			case R.id.MULTI:
				 if(s.equals(&#34;&#34;)==true||s.equals(&#34;FFFFFFFFF&#34;)==true)
				   {
					   s=&#34;0&#34;;
				   }
				a=Double.parseDouble(s);
				s=&#34;&#34;;
				option=3;
				edit.setText(&#34;&#34;);  
				First=0;
			
				flag=false;
				dot=0;
				break;
			case R.id.DIV:
				 if(s.equals(&#34;&#34;)==true||s.equals(&#34;FFFFFFFFF&#34;)==true)
				   {
					   s=&#34;0&#34;;
				   }
				a=Double.parseDouble(s);
				dot=0;
				option=4;
				
				edit.setText(&#34;&#34;); 
				First=0;
				flag=false;
				break;
			case R.id.EQUE:
			{
				switch(option)
				{
				  case 1:
					  b=Double.parseDouble(s);
					  edit.setText(String.valueOf(a+b));
					 break;
				 case 2:
					 b=Double.parseDouble(s);
					 edit.setText(String.valueOf(a-b));
					 break;
				 case 3:
					 b=Double.parseDouble(s);
					 edit.setText(String.valueOf(a*b));
					 break;
				 case 4:
				       {
								 b=Double.parseDouble(s);
								 if(b!=0)
								 {
								 edit.setText(String.valueOf(a/b));
								 break;
								 }
								 else
								 {
									 edit.setText(&#34;FFFFFFFFF&#34;);
									 break;						
								}
					    }
			     			      
				      
				   }
				s=&#34;&#34;;
				First=0;
				flag=false;
				dot=0;
				newdigital=true;
				break;
		    	}
				
			}
				
						
		
	   

	

}

};

}

最后结果：