java.lang.ClassNotFoundException: android.os.storage.IMountService

问题描述

方法调用包括 USB 设备 umount/eject 但它抛出异常：

Class.forName("android.os.storage.IMountService") 

作为

找不到类异常

我如何访问 IMountService 课程？

fun getRemovabeStorages(context: Context): List<File?>? {
  
        var storages: ArrayList<File>
        storages = ArrayList()
        val getService: Method = Class.forName("android.os.ServiceManager")
            .getDeclaredMethod("getService",String::class.java)
        if (!getService.isAccessible) getService.isAccessible = true
        val service = getService.invoke(null,"mount") as IBinder
        val asInterface: Method = Class.forName("android.os.storage.IMountService")
            .getDeclaredMethod("asInterface",IBinder::class.java)
        if (!asInterface.isAccessible) asInterface.isAccessible = true
        val mountService: Any = asInterface.invoke(null,service)
        var storageVolumes: Array<Any>
        storageVolumes = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            val packageName = context.packageName
            val uid =
                context.packageManager.getPackageInfo(packageName,0).applicationInfo.uid
            val getVolumeList: Method = mountService.javaClass.getDeclaredMethod(
                "getVolumeList",Int::class.javaPrimitiveType,String::class.java,Int::class.javaPrimitiveType
            )
            if (!getVolumeList.isAccessible) getVolumeList.isAccessible = true
            getVolumeList.invoke(mountService,uid,packageName,0) as Array<Any>
        } else {
            val getVolumeList: Method = mountService.javaClass.getDeclaredMethod("getVolumeList")
            if (!getVolumeList.isAccessible) getVolumeList.isAccessible = true
            getVolumeList.invoke(mountService) as Array<Any>
        }
        for (storageVolume in storageVolumes) {
            val cls: Class<*> = storageVolume.javaClass
            val isRemovable: Method = cls.getDeclaredMethod("isRemovable")
            if (!isRemovable.isAccessible) isRemovable.isAccessible = true
            if (isRemovable.invoke(storageVolume) as Boolean) {
                val getState: Method = cls.getDeclaredMethod("getState")
                if (!getState.isAccessible) getState.isAccessible = true
                val state = getState.invoke(storageVolume) as String
                if (state == "mounted") {
                    val getPath: Method = cls.getDeclaredMethod("getPath")
                    if (!getPath.isAccessible) getPath.isAccessible = true
                    val path = getPath.invoke(storageVolume) as String
                    storages.add(File(path))
                }
            }
        }
        if (storages != null) {
            storages.forEach {
                Log.d("JioSettings","storage-${it.absolutePath}")
                val unmountVolume: Method = mountService.javaClass.getDeclaredMethod(
                    "unmountVolume",Boolean::class.javaPrimitiveType,Boolean::class.javaPrimitiveType
                )
                if (!unmountVolume.isAccessible) unmountVolume.isAccessible = true
                unmountVolume.invoke(mountService,it.absolutePath,true,true)
            }
        }
        return storages
}

解决方法

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