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

<android.support.design.widget.TextInputLayout 
 android:id="@+id/til_user" 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content" 
 android:layout_marginTop="20dp" 
 android:layout_marginLeft="20dp" 
 android:layout_marginRight="20dp"> 
 <EditText 
  android:id="@+id/et_user" 
  android:layout_width="match_parent" 
  android:layout_height="wrap_content" 
  android:hint="請(qǐng)輸入用戶名"/> 
 </android.support.design.widget.TextInputLayout> 

etUser= (EditText) findViewById(R.id.et_user); 
 tilUser= (TextInputLayout) findViewById(R.id.til_user); 
 
 //添加文本變化監(jiān)聽 
 etUser.addTextChangedListener(new TextWatcher() { 
  @Override 
  //輸入文本之前調(diào)用 
  public void beforeTextChanged(CharSequence s, int start, int count, int after) { 
  } 
 
  @Override 
  //正在輸入的時(shí)候調(diào)用 
  public void onTextChanged(CharSequence s, int start, int before, int count) { 
  if(s.length()>6){ 
   //打開TextInputLayout異常提示 
   tilUser.setErrorEnabled(true); 
   //設(shè)置TextInputLayout異常提示信息 
   tilUser.setError("賬號(hào)最大長度為6"); 
  }else { 
   //關(guān)閉TextInputLayout異常提示 
   tilUser.setErrorEnabled(false); 
  } 
  } 
 
  @Override 
  //輸入以后調(diào)用 
  public void afterTextChanged(Editable s) { 
  } 
 });