渲染问题 - 找不到以下类

Question

我添加this library以支持Lollipop前设备上的循环显示。 我已阅读设置指南，一切实际上都很棒！它编译时没有错误，并且正如预期的那样在应用程序中工作。但是，我正面临一些“渲染问题”的警告，我无法摆脱。它说：

Rendering Problems 
The following classes could not be found:
- io.codetail.widget.RevealLinearLayout (Fix Build Path, Create Class)
 Tip: Try to build the project.

我的.xml文件：

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".SingleGameActivity"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:id="@+id/mainLayout"
    android:background="@color/game_background">

    <!-- Some other stuff -->

    <io.codetail.widget.RevealLinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/newPlaceWrapper"
            android:background="#95000000"
            android:orientation="vertical"
            android:visibility="invisible">
            <TextView
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:id="@+id/textNewPlace"
                android:text=""
                android:textColor="#ffffffff"
                android:textSize="30sp"
                android:gravity="center"
                android:paddingTop="20dp"
                android:paddingBottom="20dp"/>

        </LinearLayout>
    </io.codetail.widget.RevealLinearLayout>
<!-- Some other stuff -->
</RelativeLayout>

我的build.gradle（模块：app）

apply plugin: 'com.android.application'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        applicationId "//"
        minSdkVersion 16
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }
}

repositories {
    maven { url 'https://jitpack.io' }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:support-v4:22.2.0'
    compile 'com.android.support:support-v13:21.0.2'
    compile 'com.github.ozodrukh:CircularReveal:1.1.1'
}