一个Android进制转换器

package com.com.twe.wew;
import com.waps.AdView;
import com.waps.AppConnect;

import android.app.Activity;
import android.os.Bundle;
import android.view.Display;
import android.view.Gravity;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
public class JZZH extends Activity {
 private Button js_jz;
 private Button CK;
 private Button jt4;
    private EditText two=null;
    private EditText eight=null;
    private EditText ten=null;
    private EditText sixteen=null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

         //去掉标题
        requestWindowFeature(Window.FEATURE_NO_TITLE);
 //全屏     

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.jzzh);
       
      
 AppConnect.getInstance(this);
       
        LinearLayout container =(LinearLayout)findViewById(R.id.AdLinearLayout);
        new AdView(this,container).DisplayAd();
       
      //获取屏幕宽和高
        WindowManager w=getWindowManager();
        Display display=w.getDefaultDisplay();
        int width=display.getWidth();
 
        js_jz=(Button)findViewById(R.id.js_jz);
        CK=(Button)findViewById(R.id.ck);
        jt4=(Button)findViewById(R.id.jt4);
        two=(EditText)findViewById(R.id.two);
        eight=(EditText)findViewById(R.id.eight);
        ten=(EditText)findViewById(R.id.ten);
    sixteen=(EditText)findViewById(R.id.sixteen);            
       
        js_jz.setWidth(width/4);
        CK.setWidth(width/4);
        jt4.setWidth(width/4);
  
        js_jz.setOnClickListener(new ButtonListener());
        CK.setOnClickListener(new ButtonListener()); 
        jt4.setOnClickListener(new ButtonListener());
    } 
    class ButtonListener implements View.OnClickListener{
     public void onClick(View v) {
   // TODO Auto-generated method stub
      
   String  temp=null,num1=null,num2=null,num3=null,num4=null;
   switch(v.getId())
   {
   case R.id.js_jz:
   {   
    if(two.hasFocus())
    { 
     try
     {
     temp=two.getText().toString();     
     num3=Integer.valueOf(temp,2).toString();//将二进制转换为十进制；
     num2=Integer.toOctalString(Integer.parseInt(num3)); 
     num4=Integer.toHexString(Integer.parseInt(num3));
     eight.setText(num2);     
     ten.setText(num3);
     sixteen.setText(num4.toUpperCase()); 
     }
     catch(Exception e)
     {
      TTS("数据错误,请重新输入数据");
     }
   }
    else if(eight.hasFocus())
    { 
     try{
     temp=eight.getText().toString();
     num3=Integer.valueOf(temp,8).toString();
     num1=Integer.toBinaryString(Integer.parseInt(num3));
     num4=Integer.toHexString(Integer.parseInt(num3));
     two.setText(num1);
     ten.setText(num3);
     sixteen.setText(num4.toUpperCase());
     }
     catch(Exception e)
     {
      TTS("数据错误,请重新输入数据");

     }
    }
    else if(ten.hasFocus())
    {  
     try{
     num3=ten.getText().toString();
     num1=Integer.toBinaryString(Integer.parseInt(num3));
     num2=Integer.toOctalString(Integer.parseInt(num3));
     num4=Integer.toHexString(Integer.parseInt(num3));
     two.setText(num1);
        eight.setText(num2);
     sixteen.setText(num4.toUpperCase());
     }
     catch(Exception e)
     {
      TTS("数据错误,请重新输入数据");

     }
    } 
    else if(sixteen.hasFocus())
    {  
     try{
     temp=sixteen.getText().toString();
     num3=Integer.valueOf(temp,16).toString();
     num1=Integer.toBinaryString(Integer.parseInt(num3));
     num2=Integer.toOctalString(Integer.parseInt(num3));
     two.setText(num1);
     eight.setText(num2);
     ten.setText(num3);
     sixteen.setText(temp.toUpperCase());
     }
     catch(Exception e)
     {
      TTS("数据错误,请重新输入数据");

     }
    } 
   }
   break;
   case R.id.ck:
    two.setText("");
    eight.setText("");
       ten.setText("");
    sixteen.setText("");
   break;
   case R.id.jt4:
   if(two.hasFocus())
   {
       String a=two.getText().toString();
       String b=null;
       int c=a.length();
       if(c!=0)
       {
        b=a.substring(0,c-1);
              two.setText(b);
       }
       else
    {
     two.setText("");
    }
   }
   else if(eight.hasFocus())
   {
       String a=eight.getText().toString();
       String b=null;
       int c=a.length();
       if(c!=0)
       {
        b=a.substring(0,c-1);
        eight.setText(b);
       }
       else
    {
        eight.setText("");
    }
   }
   else if(ten.hasFocus())
   {
       String a=ten.getText().toString();
       String b=null;
       int c=a.length();
       if(c!=0)
       {
        b=a.substring(0,c-1);
        ten.setText(b);
       }
       else
    {
        ten.setText("");
    }
   }
   else if(sixteen.hasFocus())
   {
       String a=sixteen.getText().toString();
       String b=null;
       int c=a.length();
       if(c!=0)
       {
        b=a.substring(0,c-1);
        sixteen.setText(b);
       }
       else
    {
        sixteen.setText("");
    }
   }
   }
  }     
 };
    public void TTS(String str)
    {
     View view=getLayoutInflater().inflate(R.layout.taost,null);
  TextView textView=(TextView)view.findViewById(R.id.toast);
  textView.setText(str);
  textView.setBackgroundResource(R.drawable.corner_view);
  Toast toast=new Toast(JZZH.this);
  toast.setDuration(Toast.LENGTH_LONG);
  toast.setGravity(Gravity.CENTER, 0, 0);
  toast.setView(view);
  toast.show();
    }
}

布局文件为jzzh.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:background="@drawable/my_shape3"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <TextView    
        android:text="二进制" 
        android:textColor="#FF6347"
        android:textSize="25px"       
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"></TextView>
    <EditText
        android:layout_height="wrap_content" 
        android:id="@+id/two"
        android:background="@drawable/my_shape3"
        android:cursorVisible="false"
        android:textColor="#FF6347"
        android:textSize="25px"
        android:layout_width="match_parent"></EditText>
    <TextView
        android:text="八进制" 
        android:textColor="#FF6347"
        android:textSize="25px"       
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"></TextView>
    <EditText
        android:layout_height="wrap_content" 
        android:id="@+id/eight"
        android:background="@drawable/my_shape3"
        android:cursorVisible="false"
        android:textColor="#FF6347"
        android:textSize="25px"
        android:layout_width="match_parent"></EditText>
    <TextView
        android:text="十进制" 
        android:textColor="#FF6347"
        android:textSize="25px"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"></TextView>
    <EditText
        android:layout_height="wrap_content" 
        android:id="@+id/ten"
        android:textColor="#FF6347"
        android:textSize="25px"
        android:background="@drawable/my_shape3"
        android:cursorVisible="false"
        android:layout_width="match_parent"></EditText>
    <TextView
        android:text="十六进制" 
        android:textColor="#FF6347"
        android:textSize="25px"     
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"></TextView>
    <EditText
        android:layout_height="wrap_content" 
        android:id="@+id/sixteen"
        android:background="@drawable/my_shape3"
        android:textColor="#FF6347"
        android:textSize="25px"
        android:cursorVisible="false"
        android:layout_width="match_parent"></EditText>
       
      
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    >
   
     <Button
        android:text="←"
        android:id="@+id/jt4"
        android:textColor="#FF6347"
        android:layout_margin="3px" 
        android:background="@drawable/my_shape3"
        android:textSize="25px"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
       
    <Button
        android:text="C"
        android:id="@+id/ck"
        android:layout_margin="3px" 
        android:textColor="#FF6347"
        android:background="@drawable/my_shape3"
        android:textSize="25px"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
   
    <Button
        android:text="计算"   
        android:textColor="#FF6347"
        android:layout_margin="3px"   
        android:id="@+id/js_jz"
        android:background="@drawable/my_shape3"
        android:textSize="25px"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"></Button>
    
</LinearLayout>
   <LinearLayout
android:id="@+id/AdLinearLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal"/>
</LinearLayout>