實現(xiàn)思路：為EditText設(shè)置監(jiān)聽歌殃，調(diào)用addTextChangedListener(TextWatcher watcher)方法。然后在onTextChanged()方法中處理字符串并顯示到EditText上畸悬，最后我們要在afterTextChanged(Editable s)方法中將光標(biāo)移動到最后

下面先熟悉一下TextWatcher 接口回調(diào)函數(shù)：

public interface TextWatcher extends NoCopySpan {
    /**
     * This method is called to notify you that, within <code>s</code>,
     * the <code>count</code> characters beginning at <code>start</code>
     * are about to be replaced by new text with length <code>after</code>.
     * It is an error to attempt to make changes to <code>s</code> from
     * this callback.
     * 在字符串s內(nèi),從索引為start(包含)的字符開始的count個字符將被長度為after的新文    
     * 本代替
     */
    public void beforeTextChanged(CharSequence s, int start,
                                  int count, int after);
    /**
     * This method is called to notify you that, within <code>s</code>,
     * the <code>count</code> characters beginning at <code>start</code>
     * have just replaced old text that had length <code>before</code>.
     * It is an error to attempt to make changes to <code>s</code> from
     * this callback.
     * 在字符串s內(nèi),從索引為start(包含)的字符開始count個字符剛剛替換了長度為before的
     * 舊字符
     */
    public void onTextChanged(CharSequence s, int start, int before, int count);

    /**
     * This method is called to notify you that, somewhere within
     * <code>s</code>, the text has been changed.
     * It is legitimate to make further changes to <code>s</code> from
     * this callback, but be careful not to get yourself into an infinite
     * loop, because any changes you make will cause this method to be
     * called again recursively.
     * (You are not told where the change took place because other
     * afterTextChanged() methods may already have made other changes
     * and invalidated the offsets.  But if you need to know here,
     * you can use {@link Spannable#setSpan} in {@link #onTextChanged}
     * to mark your place and then look up from here where the span
     * ended up.
     * 字符串s內(nèi)容已經(jīng)發(fā)生了變化.可以在這一步對s進行合理的變更,但是要注意不要進入
     * 無限循環(huán),因為字符串的任何變化都會再次遞歸調(diào)用此回調(diào)方法.在這個方法中不會告
     * 訴 你字符串哪些內(nèi)容發(fā)生了變化,因為其他針對字符串的改變已經(jīng)調(diào)用了
     * afterTextChanged().如果你想知道哪些發(fā)生了變化,可以在
     * onTextChanged(CharSequence, int, int, int)使用setSpan(Object, int, int, int)做標(biāo)記
     */
    public void afterTextChanged(Editable s);
}

實現(xiàn)代碼如下：

注意，手機號碼為11位，但是因為有特殊字符（代碼中將空格替換為想要的字符）或者空格，所以EditText的 android:maxLength="13" 屬性要設(shè)置為大于11究珊，我的由于存在兩個空格，所以設(shè)置最大為13纵苛。

<EditText
        android:id="@+id/et_phone"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@null"
        android:digits="1234567890"<!--只允許輸入這10個數(shù)字-->
        android:hint="請輸入手機號"
        android:inputType="phone|number"<!--設(shè)置鍵盤輸入類型為數(shù)字鍵盤-->
        android:maxLength="13" />

 etPhone.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                int length = s.toString().length();
               //刪除數(shù)字
                if (count == 0) {
                    if (length == 4) {
                        etPhone.setText(s.subSequence(0, 3));
                    }
                    if (length == 9) {
                        etPhone.setText(s.subSequence(0, 8));
                    }
                }
                //添加數(shù)字
                if (count == 1) {
                    if (length == 4) {
                        String part1 = s.subSequence(0, 3).toString();
                        String part2 = s.subSequence(3, length).toString();
                        etPhone.setText(part1 + " " + part2);
                    }
                    if (length==9){
                        String part1 = s.subSequence(0, 8).toString();
                        String part2 = s.subSequence(8, length).toString();
                        etPhone.setText(part1 + " " + part2);
                    }
                }
            }
            @Override
            public void afterTextChanged(Editable s) {
               //將光標(biāo)移動到末尾
                etPhone.setSelection(etPhone.getText().toString().length());
              //處理s
        });

代碼很簡單，下面看看效果圖：

edit_text.png

雖然效果做出來了言津，但是當(dāng)我們調(diào)用etPhone.getText().toString()方法時攻人，你會發(fā)現(xiàn)得到的結(jié)果里也是包含空格或者特殊字符的一串號碼。如果想要純數(shù)字的結(jié)果悬槽，那么就需要對結(jié)果進行一下處理：

//從EditText獲取的字符串
 String phoneNum=etPhone.getText().toString();
//純數(shù)字字符串
String number=formatPhoneNum(phoneNum);
 /**
     * 去掉手機號內(nèi)除數(shù)字外的所有字符
     *
     * @param phoneNum 手機號
     * @return
     */
    private String formatPhoneNum(String phoneNum) {
        String regex = "(\\+86)|[^0-9]";
        Pattern pattern = Pattern.compile(regex );
        Matcher matcher = pattern.matcher(phoneNum);
        return matcher.replaceAll("");
    }