android - 想要在 EditText 中格式化数字

Question

我想在EditText中对数字形式的输入进行格式化，格式为01-133134-124。我想要第一个 - 在 2 个数字之后然后在 6 个数字之后下一个破折号。我试过了但是每当我因为输入错误而按下删除/退格键时格式停止工作并且在输入 2 个数字后没有破折号或6 个数字。这是代码。其中 Enrollement 是 EditText 字段。

格式:2digitnumber-6dignumber-3dignumber

Enrollement.addTextChangedListener(new TextWatcher() {

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

        Enrollement.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {

                if (keyCode == KeyEvent.KEYCODE_DEL)
                    keyDel = 1;
                return false;
            }
        });

        if (keyDel == 0) {
            int len = Enrollement.getText().length();
            if (len == 2) {
                int leng = Enrollement.getText().length();
                if(leng==2) {
                    Enrollement.setText(Enrollement.getText() + "-");
                    Enrollement.setSelection(Enrollement.getText().length());
                }
                } else if (len == 9) {
                int leng = Enrollement.getText().length();
                if(leng==9) {
                    Enrollement.setText(Enrollement.getText() + "-");
                    Enrollement.setSelection(Enrollement.getText().length());
                }
            }
        } else {
            keyDel = 0;
        }
    }

    @Override
    public void afterTextChanged(Editable arg0) {

    }

    @Override
    public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {

    }
});

Answer 1

如果您稍微改变一下方法，就会容易得多。在 EditText 中的每一次更改之后，您可能总是在分析字符串的未格式化版本。

试试这个(记得为你的 EditText 设置 android:maxLength="13"):

Enrollement.addTextChangedListener(new TextWatcher() {

    final int[] blockLengths = new int[]{2, 6, 3};
    String mUnformatted = "";

    @Override
    public void onTextChanged (CharSequence s,int start, int before, int count){
        String unformattedSeq = s.toString().replace("-", "");
        if (mUnformatted.length() == unformattedSeq.length()) {
            return; //length of text has not changed
        }

        mUnformatted = unformattedSeq;
        //formatting sequence
        StringBuilder formatted = new StringBuilder();
        int blockIndex = 0;
        int currentBlock = 0;
        for (int i = 0; i < mUnformatted.length(); ++i) {
            if (currentBlock == blockLengths[blockIndex]) {
                formatted.append("-");
                currentBlock = 0;
                blockIndex++;
            }
            formatted.append(mUnformatted.charAt(i));
            currentBlock++;
        }

        Enrollement.setText(formatted.toString());
        Enrollement.setSelection(formatted.length());
    }

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

    @Override
    public void afterTextChanged (Editable s){
    }
});

这段代码应该可以正常工作。您只能改进 setSelection 部分(目前，如果您删除 EditText 中间的数字，它会将光标移动到文本末尾)。