package com.jixiong.teen.view;
import android.content.Context;
import android.text.Editable;
import android.text.Selection;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.widget.EditText;
/**
 * Created by christy on 16/12/22.
 */
public class MoblieEditText extends EditText {
  public MoblieEditText(Context context) {
    super(context);
    this.addTextChangedListener(new MoblieWatcher());
  }
  public MoblieEditText(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.addTextChangedListener(new MoblieWatcher());
  }
  public MoblieEditText(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    this.addTextChangedListener(new MoblieWatcher());
  }
  class MoblieWatcher implements TextWatcher {
    int beforeTextLength = 0;
    int onTextLength = 0;
    boolean isChanged = false;
    int location = 0;// 記錄光標(biāo)的位置
    private char[] tempChar;
    private final StringBuffer buffer = new StringBuffer();
    int konggeNumberB = 0;
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count,
                   int after) {
      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 onTextChanged(CharSequence s, int start, int before, int count) {
      onTextLength = s.length();
      buffer.append(s.toString());
      if (onTextLength == beforeTextLength || onTextLength <= 3 || isChanged) {
        isChanged = false;
        return;
      }
      isChanged = true;
    }
    @Override
    public void afterTextChanged(Editable s) {
      if (isChanged) {
        location = 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 == 3 || index == 8)) {
            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;
        }
        setText(str);
        Editable etable = getText();
        Selection.setSelection(etable, location);
        isChanged = false;
      }
    }
  }
}

<com.jixiong.teen.view.MoblieEditText
  android:id="@+id/etUserNums"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:background="@null"
  android:hint="@string/user_name"
  android:inputType="number"
  android:maxLines="1"
  android:paddingLeft="@dimen/margin_twenty"
  android:singleLine="true"
  android:textColorHint="@color/hint_color"
  android:textSize="@dimen/sp_14" />

etUserNums.addTextChangedListener(new TeenEmptyWatcher() {
  @Override
  public void onTextChanged(CharSequence s, int start, int before, int count) {
  }
  @Override
  public void afterTextChanged(Editable s) {
    if (s != null && s.length() == 13) {
      if (etUserNums.isFocused()) {
        etUserNums.clearFocus();
        etUserPwd.requestFocus();
      }
    }
  }
});