Android Studio使用AIDL时无法找到自定义的类

在build.gradle 中添加一段代码。
apply plugin: 'com.android.application'

android {
    compileSdkVersion 24
    buildToolsVersion '24.0.2'
    defaultConfig {
        applicationId "com.example.tcoy.news"
        minSdkVersion 15
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
//添加下边的这段代码块
  sourceSets {
        main {
            manifest.srcFile 'src/main/AndroidManifest.xml'
            java.srcDirs = ['src/main/java', 'src/main/aidl']
            resources.srcDirs = ['src/main/java', 'src/main/aidl']
            aidl.srcDirs = ['src/main/aidl']
            res.srcDirs = ['src/main/res']
            assets.srcDirs = ['src/main/assets']
        }
    }



    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}


dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:24.2.1'
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:design:24.2.1'
    compile 'com.squareup.okhttp3:okhttp:3.4.1'
    compile 'com.google.code.gson:gson:2.7'
    compile files('libs/slidingmenulibary.jar')
}