从内部类访问变量而不将其定型
[英]Access variable from inner class without making it final
问题描述
我怎样才能使它工作：
public void onStart()
{
super.onStart();
int dayN = 0;
int i = 0;
String day = null;
String addFach;
String mo1 = null;
String mo2 = null;
String mo3 = null;
String mo4 = null;
String mo5 = null;
String mo6 = null;
String mo7 = null;
String mo8 = null;
String mo9 = null;
String mo10 = null;
String mo11 = null;
String di1 = null;
String di2 = null;
String di3 = null;
String di4 = null;
String di5 = null;
String di6 = null;
String di7 = null;
String di8 = null;
String di9 = null;
String di10 = null;
String di11 = null;
String mi1 = null;
String mi2 = null;
String mi3 = null;
String mi4 = null;
String mi5 = null;
String mi6 = null;
String mi7 = null;
String mi8 = null;
String mi9 = null;
String mi10 = null;
String mi11 = null;
String do1 = null;
String do2 = null;
String do3 = null;
String do4 = null;
String do5 = null;
String do6 = null;
String do7 = null;
String do8 = null;
String do9 = null;
String do10 = null;
String do11 = null;
String fr1 = null;
String fr2 = null;
String fr3 = null;
String fr4 = null;
String fr5 = null;
String fr6 = null;
String fr7 = null;
String fr8 = null;
String fr9 = null;
String fr10 = null;
String fr11 = null;
while (dayN <= 4)
{
if (dayN == 0)
{
day = "Montag";
} else if (dayN == 1)
{
day = "Dienstag";
} else if (dayN == 2)
{
day = "Mittwoch";
} else if (dayN == 3)
{
day = "Donnerstag";
} else if (dayN == 4)
{
day = "Freitag";
}
while (i <= 10)
{
BufferedReader buf;
try
{
buf = new BufferedReader(new FileReader("/sdcard/" + i + day + "fach.txt"));
addFach = buf.readLine();
if (day == "Montag")
{
if (i == 0) mo1 = addFach;
else if (i == 1) mo2 = addFach;
else if (i == 2) mo3 = addFach;
else if (i == 3) mo4 = addFach;
else if (i == 4) mo5 = addFach;
else if (i == 5) mo6 = addFach;
else if (i == 6) mo7 = addFach;
else if (i == 7) mo8 = addFach;
else if (i == 8) mo9 = addFach;
else if (i == 9) mo10 = addFach;
else if (i == 10) mo11 = addFach;
} else if (day == "Dienstag")
{
if (i == 0) di1 = addFach;
else if (i == 1) di2 = addFach;
else if (i == 2) di3 = addFach;
else if (i == 3) di4 = addFach;
else if (i == 4) di5 = addFach;
else if (i == 5) di6 = addFach;
else if (i == 6) di7 = addFach;
else if (i == 7) di8 = addFach;
else if (i == 8) di9 = addFach;
else if (i == 9) di10 = addFach;
else if (i == 10) di11 = addFach;
} else if (day == "Mittwoch")
{
if (i == 0) mi1 = addFach;
else if (i == 1) mi2 = addFach;
else if (i == 2) mi3 = addFach;
else if (i == 3) mi4 = addFach;
else if (i == 4) mi5 = addFach;
else if (i == 5) mi6 = addFach;
else if (i == 6) mi7 = addFach;
else if (i == 7) mi8 = addFach;
else if (i == 8) mi9 = addFach;
else if (i == 9) mi10 = addFach;
else if (i == 10) mi11 = addFach;
} else if (day == "Donnerstag")
{
if (i == 0) do1 = addFach;
else if (i == 1) do2 = addFach;
else if (i == 2) do3 = addFach;
else if (i == 3) do4 = addFach;
else if (i == 4) do5 = addFach;
else if (i == 5) do6 = addFach;
else if (i == 6) do7 = addFach;
else if (i == 7) do8 = addFach;
else if (i == 8) do9 = addFach;
else if (i == 9) do10 = addFach;
else if (i == 10) do11 = addFach;
} else if (day == "Freitag")
{
if (i == 0) fr1 = addFach;
else if (i == 1) fr2 = addFach;
else if (i == 2) fr3 = addFach;
else if (i == 3) fr4 = addFach;
else if (i == 4) fr5 = addFach;
else if (i == 5) fr6 = addFach;
else if (i == 6) fr7 = addFach;
else if (i == 7) fr8 = addFach;
else if (i == 8) fr9 = addFach;
else if (i == 9) fr10 = addFach;
else if (i == 10) fr11 = addFach;
}
}
catch (Exception e)
{
}
i++;
}
i = 0;
dayN++;
}
RadioButton rB1 = (RadioButton) getView().findViewById(R.id.stunde1);
RadioButton rB2 = (RadioButton) getView().findViewById(R.id.stunde2);
RadioButton rB3 = (RadioButton) getView().findViewById(R.id.stunde3);
RadioButton rB4 = (RadioButton) getView().findViewById(R.id.stunde4);
RadioButton rB5 = (RadioButton) getView().findViewById(R.id.stunde5);
RadioButton rB6 = (RadioButton) getView().findViewById(R.id.stunde6);
RadioButton rB7 = (RadioButton) getView().findViewById(R.id.stunde7);
RadioButton rB8 = (RadioButton) getView().findViewById(R.id.stunde8);
RadioButton rB9 = (RadioButton) getView().findViewById(R.id.stunde9);
RadioButton rB10 = (RadioButton) getView().findViewById(R.id.stunde10);
RadioButton rB11 = (RadioButton) getView().findViewById(R.id.stunde11);
DatePicker dP = (DatePicker) getView().findViewById(R.id.datePicker);
dP.init(dP.getYear(), dP.getMonth(), dP.getDayOfMonth(), new DatePicker.OnDateChangedListener()
{
public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth)
{
Calendar cal = Calendar.getInstance();
cal.set(year, monthOfYear, dayOfMonth);
int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
switch(dayOfWeek)
{
case Calendar.MONDAY:
rB1.setText(mo1);
break;
}
}
});
}
它应根据带有日期选择器的所选日期的工作日设置某些单选按钮的文本。 我无法将字符串设置为final，因为它们被分配了2次值。
3 个解决方案
解决方案1
4 2013-08-26 13:23:49
不，不可能。
使用的但未在内部类中声明的任何局部变量，形式参数或异常参数必须声明为final。
内部类中使用但未声明的任何局部变量必须在内部类主体之前明确分配（第16节）。
附带说明：请使用Collections而不是声明很多字段。
这是如何从文档中访问它们的示例：
class WithDeepNesting {
boolean toBe;
WithDeepNesting(boolean b) { toBe = b; }
class Nested {
boolean theQuestion;
class DeeplyNested {
DeeplyNested(){
theQuestion = toBe || !toBe; // here you are able to access now.
}
}
}
}
解决方案2
3 已采纳 2013-08-26 13:23:59
如果声明它们作为成员变量（一个方法以外，优选之前onCreate()为了可读性），他们将在整个访问Activity甚至内部类的的Activity
解决方案3
1 2013-08-26 13:25:16
通常的方法是将它们转换为成员变量。 但是，根据您的情况，您需要重新考虑您的设计。
您有太多的代码重复。 您应该将其重构为使用集合，这时内部类问题便会解决。
Java-访问内部类中的变量或为最终变量分配值
[英]Java - access to variable within inner class or assign a value to final variable
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[英]"variable is accessed from within inner class needs to be declared final" error
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