Android Studio 从输出应用程序中删除库 类

Android Studio removes library classes from output app

我在我的项目中禁用了混淆器:

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

我正在使用 side menu 库。它已在 build.gradle:

中得到解决
dependencies {
    ...
    compile files('libs/sidemenu.jar')
}

但是当我编译 运行 我的应用程序时,它会抱怨找不到 class(com.agimind.widget.SlideHolder,它在指定的库中)!

E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{**.***.reader/**.***.reader.MainActivity}: android.view.InflateException: Binary XML file line #1: Error inflating class com.agimind.widget.SlideHolder
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1959)
        ...
        at dalvik.system.NativeStart.main(Native Method)
 Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class com.agimind.widget.SlideHolder
        at android.view.LayoutInflater.createView(LayoutInflater.java:606)
        ...
        at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:251)
        at android.app.Activity.setContentView(Activity.java:1835)
        at **.***.reader.MainActivity.onCreate(MainActivity.java:121)
        at android.app.Activity.performCreate(Activity.java:4465)
        ...
        at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Constructor.constructNative(Native Method)
        ...
        at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:251)
        at android.app.Activity.setContentView(Activity.java:1835)
        at **.***.reader.MainActivity.onCreate(MainActivity.java:121)
        at android.app.Activity.performCreate(Activity.java:4465)
        ...
 Caused by: java.lang.NoClassDefFoundError: com.agimind.widget.SlideHolder
        at com.agimind.widget.SlideHolder.<init>(SlideHolder.java:604)
        at java.lang.reflect.Constructor.constructNative(Native Method)
        ...
        at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:251)
        at android.app.Activity.setContentView(Activity.java:1835)
        at **.***.reader.MainActivity.onCreate(MainActivity.java:121)
        at ...

注意:我也试过gradlew clean,没有成功。

旁注:这个项目使用了一些大库,我为此启用了multi-dex

任何帮助将不胜感激。

那是因为我还没有完成 multi-dex 的必要步骤。我没有将它添加到 AndroidManifest.xml:

<application
    android:name="android.support.multidex.MultiDexApplication"
    ...

因此,应用无法在第二个 dex 文件中找到 类。