android 银行卡。。空格输入

	class myWatcher implements TextWatcher {
		int beforeTextLength = 0;
		int onTextLength = 0;
		boolean isChanged = false;
 
		int location = 0;// 记录光标的位置
		private char[] tempChar;
		private StringBuffer buffer = new StringBuffer();
		int konggeNumberB = 0;
 
		@Override
		public void onTextChanged(CharSequence s, int start, int before,
				int count) {
			// TODO Auto-generated method stub
			onTextLength = s.length();
			buffer.append(s.toString());
			if (onTextLength == beforeTextLength || onTextLength <= 3
					|| isChanged) {
				isChanged = false;
				return;
			}
			isChanged = true;
		}
 
		@Override
		public void beforeTextChanged(CharSequence s, int start, int count,
				int after) {
			// TODO Auto-generated method stub
			beforeTextLength = s.length();
			if (buffer.length() > 0) {
				buffer.delete(0, buffer.length());
			}
			konggeNumberB = 0;
			for (int i = 0; i < s.length(); i++) {
				if (s.charAt(i) == ' ') {
					konggeNumberB++;
				}
			}
		}
 
		@Override
		public void afterTextChanged(Editable s) {
			// TODO Auto-generated method stub
			if (isChanged) {
				location = etAccount.getSelectionEnd();
				int index = 0;
				while (index < buffer.length()) {
					if (buffer.charAt(index) == ' ') {
						buffer.deleteCharAt(index);
					} else {
						index++;
					}
				}
 
				index = 0;
				int konggeNumberC = 0;
				while (index < buffer.length()) {
					if ((index == 4 || index == 9 || index == 14 || index == 19)) {
						buffer.insert(index, ' ');
						konggeNumberC++;
					}
					index++;
				}
 
				if (konggeNumberC > konggeNumberB) {
					location += (konggeNumberC - konggeNumberB);
				}
 
				tempChar = new char[buffer.length()];
				buffer.getChars(0, buffer.length(), tempChar, 0);
				String str = buffer.toString();
				if (location > str.length()) {
					location = str.length();
				} else if (location < 0) {
					location = 0;
				}
 
				etAccount.setText(str);
				Editable etable = etAccount.getText();
				Selection.setSelection(etable, location);
				isChanged = false;
			}
		}
 
	}
 
//给edititex  加入这个watcher