格式化编辑文本以采用月份和年份 [英] Format edit text to take month and year

问题描述

我有一定的要求在Android中将EditText设置为月份和年份(因此我给出的提示为mm/yy).当用户强制输入2位数的月份时，/应该可见，说(11/)，然后是年份.

I have a certain requirement to make a EditText in Android to take month and year(So I gave the hint as mm/yy). When user enters month compulsorily 2 digits, then a / should be visible, say(11/) followed by year.

以下是我在editext上使用的代码.但是，当我按下手机键盘上的十字按钮时，它不会删除/，而是会删除输入的月份.有人可以告诉我为什么这种行为吗?

The following is the code that I have used on editext. However when I press the cross button on keypad of mobile it does not delete the / but deletes the month entered. Can somebody tell me why is this behaviour?

ed.addTextChangedListener(new TextWatcher(){

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {

    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,int after) {

    }

    @Override
    public void afterTextChanged(Editable s) {
        if(ed.getText().toString().matches("[0-9]") && ed.getText().toString().length()==2)  {
             month=ed.getText().toString();
            ed.setText(month+"/");  
        }
    }
});

推荐答案

要实现的目标，请尝试以下我已经测试过的

for what you want to achieve try the following i have tested it

将这两行添加到xml中的edittext

add these 2 lines to your edittext in your xml

android:maxLength="7"
android:inputType="number"

在您的活动中添加以下内容

add the following in your activity

public int pos=0; //declare this as global variable

ed=(EditText)findViewById(R.id.editText1);
ed.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
            // TODO Auto-generated method stub

            if(ed.getText().length()==2 && pos!=3)
            {   ed.setText(ed.getText().toString()+"/");
                ed.setSelection(3);
            }

        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                int arg3) {
            // TODO Auto-generated method stub
            pos=ed.getText().length();
        }

        @Override
        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub

        }
    });

在此处，输入第二个数字/附加第二个数字后，编辑文本将仅包含数字，且长度不超过7.

here edit text will take only numbers and length not more than 7, when second number is entered / is appended to it

pos变量 当您位于位置3时，即/之后并按返回键，位置在2处，因此它再次附加/，以避免此pos在文本更改之前记录pos，因此当先前位置为3并按返回键时，它将不会附加/导致删除/

The pos variable when you are at position 3 ie after / and press a back key the position is at 2 so it again appends / to avoid this pos records the pos before the text changed so when previous position was 3 before you press back key it will not append / resulting in deleting /

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