从NonStatic Java获取数据到静态

public class RetrieveActivity extends Activity { 
    static String dateData; 
    static int choice ; 



    @Override 
    protected void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_retrieve); 
    } 

    public void showDatePickerDialogFrom(View v) 
    { 
     choice=1; 
     DialogFragment newFragment = new DatePickerFragment(); 
     newFragment.show(getFragmentManager(), "datePicker"); 
    } 


    public void showDatePickerDialogTo(View v) 
     { 
     choice=2; 
     String dateSelected; 
     DialogFragment newFragment = new DatePickerFragment(); 
     newFragment.show(getFragmentManager(), "datePicker"); 
     } 



    public static void populateSetDate(int year,int month,int day) 
    { 
     dateData = ""+day+"/"+month+"/"+year; 
     if(choice==1) 
     { 
     EditText dateFrom=(EditText)findViewById(R.id.dateTo); <------ error over here on the static to non static stuff. 
     dateFrom.setText(dateData); 
     } 
     else 
     { 
     EditText dateTo=(EditText)findViewById(R.id.dateFrom1);<--- here also the same. 
     dateTo.setText(dateData); 
     } 
    } 

    public static class DatePickerFragment extends DialogFragment 
    implements DatePickerDialog.OnDateSetListener 
    { 


     @Override 
     public Dialog onCreateDialog(Bundle savedInstanceState) 
     { 
      // Use the current date as the default date in the picker 
      final Calendar c = Calendar.getInstance(); 
      int year = c.get(Calendar.YEAR); 
      int month = c.get(Calendar.MONTH); 
      int day = c.get(Calendar.DAY_OF_MONTH); 

      // Create a new instance of DatePickerDialog and return it 
      return new DatePickerDialog(getActivity(), this, year, month, day); 
     } 

     public void onDateSet(DatePicker view, int year, int month, int day) 
     { 
      populateSetDate(year, month+1,day); 
     }

我试图将该变量更改为静态，以便它不会给我错误。然后我在网上搜索了如何解决这个问题。有些人告诉我，添加getActivity可以解决问题。但它仍然给我同样的错误。任何人都可以帮忙谢谢从NonStatic Java获取数据到静态

来源

2014-07-25 Eric Leong Zhia Choong

'populateSetDate'是静态的。你不需要这是静态的 – Raghunandan

@Raghunandan我可以知道如何 –

你看@ http://stackoverflow.com/questions/18211684/how-to-transfer-the-formatted-date-string-from-my -datepickerfragment – Raghunandan

首先让你的方法populateSetDate和变量非静态。

而在片段：

public void onDateSet(DatePicker view, int year, int month, int day) 
    { 
     ((RetrieveActivity)getActivity()).populateSetDate(year, month+1,day); 
    }

更好的解决方案是创建一个interface：

interface Callbacack{ 
    public void populateSetDate(int year,int month,int day); 
}

让你活动实现：

public class RetrieveActivity extends Activity implements Callback

内部片段：

public static class DatePickerFragment extends DialogFragment 
    implements DatePickerDialog.OnDateSetListener 
    { 
    Callback callback; 
    public void setCallback(Callback callback){ 
     this.callback = callback; 
    }

而且onDateSet

public void onDateSet(DatePicker view, int year, int month, int day) 
     { 
      callback.populateSetDate(year, month+1,day); 
     }

来源

2014-07-25 06:11:56

从NonStatic Java获取数据到静态

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