在android中需要在EditView中輸入電話號碼3 + 4 + 4格式時，以下兩種方式都可以實現，但是個人覺得第一種方式，即獲取EditView文字內容變化是最好的方式。所謂3+4+4的電話號碼格式，如：135 4567 8900

第一種：捕捉EditView的內容改變

et_PhoneNum.addTextChangedListener(new TextWatcher() {
			@Override
			public void onTextChanged(CharSequence str, int arg1, int arg2, int arg3) { // 已經改變了的。
				String contents = str.toString();
				int length = contents.length();
				if(length == 4){
					if(contents.substring(3).equals(new String(" "))){ // -
						contents = contents.substring(0, 3);
						et_PhoneNum.setText(contents);
						et_PhoneNum.setSelection(contents.length());
					}else{ // +
						contents = contents.substring(0, 3) + " " + contents.substring(3);
						et_PhoneNum.setText(contents);
						et_PhoneNum.setSelection(contents.length());
					}
				}
				else if(length == 9){
					if(contents.substring(8).equals(new String(" "))){ // -
						contents = contents.substring(0, 8);
						et_PhoneNum.setText(contents);
						et_PhoneNum.setSelection(contents.length());
					}else{// +
						contents = contents.substring(0, 8) + " " + contents.substring(8);
						et_PhoneNum.setText(contents);
						et_PhoneNum.setSelection(contents.length());
					}
				}
			}
			@Override
			public void beforeTextChanged(CharSequence str, int arg1, int arg2,int arg3) {
			}
			
			@Override
			public void afterTextChanged(Editable arg0) {// TODO Auto-generated method stub
			}
		});
 

第二種：捕獲EditText的onKeyDown和onKeyUp事件，分別進行處理，但是在搜狗軟鍵盤上，按數字的時候不能響應onKeyUp。有點bug，相比之下，還是第一種方式最好。

et_PhoneNum.setOnKeyListener(new MyEditTextOnKeyListener());

class MyEditTextOnKeyListener implements OnKeyListener{
		@Override
		public boolean onKey(View arg0, int code, KeyEvent event) {
			
			if(event.getAction() == KeyEvent.ACTION_DOWN){ 
				if(code == KeyEvent.KEYCODE_DEL){
					String phoneNum2 = et_PhoneNum.getText().toString() ;
					int length2 = phoneNum2.length() ;
					if(length2 == 5){
						phoneNum2 = phoneNum2.substring(0, 3);
						et_PhoneNum.setText(phoneNum2);
						et_PhoneNum.setSelection(phoneNum2.length());
						return true;
					}else if(length2 == 10){
						phoneNum2 = phoneNum2.substring(0, 8);
						et_PhoneNum.setText(phoneNum2);
						et_PhoneNum.setSelection(phoneNum2.length());
						return true;
					}
					return false;
				}
			}
			
			if(event.getAction() == KeyEvent.ACTION_UP){ // must caught key up
				
				String phoneNum = et_PhoneNum.getText().toString() ;
				Log.e("ACTION_UP"," code = " + code);
				Log.e("ACTION_UP"," phoneNum = " + phoneNum);
				if(phoneNum.equals("")){
					return false ;
				}
				int length = phoneNum.length() ;
				if(length == 4){
					phoneNum = phoneNum.substring(0, 3) + " " + phoneNum.substring(3, 4);
					et_PhoneNum.setText(phoneNum);
					et_PhoneNum.setSelection(phoneNum.length());
				}
				if(length == 9){
					phoneNum = phoneNum.substring(0, 8) + " " + phoneNum.substring(8, 9);
					et_PhoneNum.setText(phoneNum);
					et_PhoneNum.setSelection(phoneNum.length());
				}
			}
			return false;
		}
	}