TextInputLayout输入框控件的悬浮标签

dependencies { 
 compile 'com.android.support:design:23.3.0' 
} 

etUser= (EditText) findViewById(R.id.et_user); 
 tilUser= (TextInputLayout) findViewById(R.id.til_user); 
 
 //添加文本变化监听 
 etUser.addTextChangedListener(new TextWatcher() { 
  @Override 
  //输入文本之前调用 
  public void beforeTextChanged(CharSequence s, int start, int count, int after) { 
  } 
 
  @Override 
  //正在输入的时候调用 
  public void onTextChanged(CharSequence s, int start, int before, int count) { 
  if(s.length()>6){ 
   //打开TextInputLayout异常提示 
   tilUser.setErrorEnabled(true); 
   //设置TextInputLayout异常提示信息 
   tilUser.setError("账号最大长度为6"); 
  }else { 
   //关闭TextInputLayout异常提示 
   tilUser.setErrorEnabled(false); 
  } 
  } 
 
  @Override 
  //输入以后调用 
  public void afterTextChanged(Editable s) { 
  } 
 });