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) {   }  });