如何禁止用戶在datepicker中選擇過去的日期？

Question

我想在用戶選擇datepicker中的過去日期時，它不應該接受昨天的日期。我的應用程序將提示信息，告知用戶不能選擇低於當前date.anyone指導我請...謝謝你

mDateDisplay = (TextView) findViewById(R.id.dateDisplay); 
      Button pickDate_btn = (Button) findViewById(R.id.pickDate); 
      pickDate_btn.setOnClickListener(new View.OnClickListener() { 

      public void onClick(View v) { 
       showDialog(DATE_DIALOG_ID); 
      } 
     }); 

     final Calendar now = Calendar.getInstance(); 
     mYear = now.get(Calendar.YEAR); 
     mMonth = now.get(Calendar.MONTH); 
     mDay = now.get(Calendar.DAY_OF_MONTH); 

     updateDisplay();  

@Override 
    protected Dialog onCreateDialog(int id) { 
     switch (id) { 
      case DATE_DIALOG_ID: 
       return new DatePickerDialog(this, 
          mDateSetListener, 
          mYear, mMonth, mDay); 
     } 
     return null; 
    } 

    @Override 
    protected void onPrepareDialog(int id, Dialog dialog) { 
     switch (id) { 

      case DATE_DIALOG_ID: 
       ((DatePickerDialog) dialog).updateDate(mYear, mMonth, mDay); 
       break; 
     } 
    }  

    private void updateDisplay() { 
     mDateDisplay.setText(
      new StringBuilder() 
        // Month is 0 based so add 1 
        .append(mDay).append("-") 
        .append(mMonth + 1).append("-") 
        .append(mYear).append(" ")); 
    } 

    private DatePickerDialog.OnDateSetListener mDateSetListener = 
      new DatePickerDialog.OnDateSetListener() { 

    @Override 
    public void onDateSet(DatePicker view, int year,int monthOfYear, int dayOfMonth) { 
        // TODO Auto-generated method stub 

      mYear = year; 
        mMonth = monthOfYear; 
        mDay = dayOfMonth; 
        updateDisplay(); 

    //should add code here?    
       } 
      }; 

Answer 1

我們不能設置，限制的DatePicker選擇一個日期是不是過去的任何屬性，但我們可以做到這一點編程，通過：

if(dateObj1.before(dateObj2) || dateObj1.equals(dateObj2)){ 
//the program runs normally 
} 
else{ 

       new AlertDialog.Builder(PM_Edit.this) 

       .setTitle("Wrong Data Input!") 

       .setMessage("The end Date must be Before the start Date, please insert new Date values") 

       .setNeutralButton("Ok", 

       new DialogInterface.OnClickListener() { 

       public void onClick(DialogInterface dialog, 

       int which) { 

       } 

       }).show(); 
      } 

Answer 2

由於API級別11存在的一個方法：

DatePicker.setMinDate(new Date().getTime()) 

或者，如果其沒有工作（舊API），那麼，

Date datePickerDate = // get the value here; 
Date currentDate = new Date(); 
if (datePickerDate.before(currentDate)) { 
    // error ! 
}