爲什麼日期對話框，要求點擊三次駁回

Question

public class QuickIWantActivity extends Activity implements 
     OnDateSetListener { 
..... 
..... 
..... 

dateET.setOnTouchListener(new View.OnTouchListener() { 

@Override 
public boolean onTouch(View v, MotionEvent event) { 

Calendar cal = Calendar.getInstance(); 
DatePickerDialog datePickDiag = new DatePickerDialog(
     QuickIWantActivity.this, QuickIWantActivity.this, cal 
      .get(Calendar.YEAR), cal.get(Calendar.MONTH), 
     cal.get(Calendar.DAY_OF_MONTH)); 
     datePickDiag.show(); 
     return true; 
     } 
    }); 

@Override 
public void onDateSet(DatePicker view, int year, int monthOfYear, 
     int dayOfMonth) { 

    int month = monthOfYear + 1; 
    dateET.setText(dayOfMonth + "- " + month + "- " + year); 
} 

} 

所以在觸摸dateET這是它打開日期選擇一個EditText，我設置了新的日期，然後點擊設置，它不會被解僱，我點擊重新設置，即使現在它不會被擱置，

Answer 1

onTouch接收三個事件（正常順序）當我點擊設置第3次最終它被駁回：

MotionEvent.ACTION_DOWN 
MotionEvent.ACTION_MOVE 
MotionEvent.ACTION_UP 

既然你不檢查任何人（並返回true），你的代碼被執行3次（每個事件一次）。

解決方案：

使用onClick()（這是我會做什麼）或加校驗：

@Override 
public boolean onTouch(View v, MotionEvent event) { 

switch (event.getAction()) { 
    case MotionEvent.ACTION_DOWN: 

Calendar cal = Calendar.getInstance(); 
DatePickerDialog datePickDiag = new DatePickerDialog(
     QuickIWantActivity.this, QuickIWantActivity.this, cal 
      .get(Calendar.YEAR), cal.get(Calendar.MONTH), 
     cal.get(Calendar.DAY_OF_MONTH)); 
     datePickDiag.show(); 
     return false; 
     } 
    }); 
break; 
}