從另一個類引用MainActivity中的RadioButton時出錯

Question

我創建了一個將以二進制形式打印出時間的應用程序。 這個邏輯工作的很好，但是當我試圖分離邏輯和GUI時，遇到了一些問題。似乎有一個交叉引用問題，但我似乎無法找到它。

MainActivity：

package se.macke.binarycounter; 

import java.util.GregorianCalendar; 
import java.util.Timer; 
import java.util.TimerTask; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.View; 
import android.widget.Button; 
import android.widget.RadioButton; 
import android.widget.TextView; 

public class MainActivity extends Activity 
{ 
    public TextView text0, text; 
    public Timer timer; 
    public RadioButton rB00,rB01,rB02,rB03, rB04, rB05, rB06, rB07, rB08, rB09, 
        rB0A, rB0B, rB0C, rB0D, rB0E, rB0F, rB11, rB12; 
RadioButton[] rButtons = new RadioButton[18]; 

public Executive exec = new Executive(); // This is row 25 in the logcat reference 
public GregorianCalendar gregCal = (GregorianCalendar) GregorianCalendar.getInstance(); 

邏輯類：

/** 
* 
*/ 
package se.macke.binarycounter; 

import static java.lang.System.out; 

import java.util.GregorianCalendar; 

import android.widget.RadioButton; 

/** 
* @author macke 
    * 
*/ 
public class Executive 
{ 
//Converts the numbers to a long string with new rows 
RadioButton[] rButtons = new RadioButton[18]; 
GregorianCalendar gregCal = new GregorianCalendar(); 
MainActivity m = new MainActivity(); // This is row 21 in the LogCat reference 

private int sec = gregCal.get(GregorianCalendar.SECOND);      // time units 
private int min = gregCal.get(GregorianCalendar.MINUTE); 
private int hour = gregCal.get(GregorianCalendar.HOUR); 

的logcat中的摘錄：

08-25 13:43:53.459: E/AndroidRuntime(383): FATAL EXCEPTION: main 
08-25 13:43:53.459: E/AndroidRuntime(383): java.lang.StackOverflowError 
08-25 13:43:53.459: E/AndroidRuntime(383): at java.util.Arrays.binarySearch(Arrays.java:405) 
08-25 13:43:53.459: E/AndroidRuntime(383): at org.apache.harmony.luni.internal.util.ZoneInfo.getOffset(ZoneInfo.java:168) 
08-25 13:43:53.459: E/AndroidRuntime(383): at org.apache.harmony.luni.internal.util.ZoneInfo.getOffset(ZoneInfo.java:162) 
08-25 13:43:53.459: E/AndroidRuntime(383): at java.util.GregorianCalendar.fullFieldsCalc(GregorianCalendar.java:495) 
08-25 13:43:53.459: E/AndroidRuntime(383): at java.util.GregorianCalendar.computeFields(GregorianCalendar.java:658) 
08-25 13:43:53.459: E/AndroidRuntime(383): at java.util.Calendar.complete(Calendar.java:839) 
08-25 13:43:53.459: E/AndroidRuntime(383): at java.util.Calendar.setTimeInMillis(Calendar.java:1339) 
08-25 13:43:53.459: E/AndroidRuntime(383): at java.util.GregorianCalendar.<init>(GregorianCalendar.java:339) 
08-25 13:43:53.459: E/AndroidRuntime(383): at java.util.GregorianCalendar.<init>(GregorianCalendar.java:239) 
08-25 13:43:53.459: E/AndroidRuntime(383): at se.macke.binarycounter.Executive.<init>(Executive.java:20) 
08-25 13:43:53.459: E/AndroidRuntime(383): at se.macke.binarycounter.MainActivity.<init>(MainActivity.java:25) 
08-25 13:43:53.459: E/AndroidRuntime(383): at se.macke.binarycounter.Executive.<init>(Executive.java:21) 
08-25 13:43:53.459: E/AndroidRuntime(383): at se.macke.binarycounter.MainActivity.<init>(MainActivity.java:25) 
08-25 13:43:53.459: E/AndroidRuntime(383): at se.macke.binarycounter.Executive.<init>(Executive.java:21) 
08-25 13:43:53.459: E/AndroidRuntime(383): at se.macke.binarycounter.MainActivity.<init>(MainActivity.java:25) 
08-25 13:43:53.459: E/AndroidRuntime(383): at se.macke.binarycounter.Executive.<init>(Executive.java:21) 

我明白，邏輯不應該知道的GUI如果我可以避免。我應該初始化邏輯類中的按鈕嗎？在這種情況下，怎麼樣？

Answer 1

使用Executive類的構造函數。添加

Executive(MainActivity activity){ 

m = activity; 

} 

使用MainActivity.java:25

public Executive exec = new Executive(this); 

使用Executive.java:21

MainActivity m =null;