Kotlin 版本

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import android.content.Context
import android.os.Environment
import android.os.StatFs
import android.text.format.Formatter

object StorageUtil {

    /**
     * 获取手机内部存储空间
     */
    fun getInternalMemorySize(context: Context?): String? {
        val file = Environment.getDataDirectory()
        val statFs = StatFs(file.path)
        val blockSizeLong = statFs.blockSizeLong
        val blockCountLong = statFs.blockCountLong
        val size = blockCountLong * blockSizeLong
        return Formatter.formatFileSize(context, size)
    }

    /**
     * 获取手机内部可用存储空间
     */
    fun getAvailableInternalMemorySize(context: Context?): String? {
        val file = Environment.getDataDirectory()
        val statFs = StatFs(file.path)
        val availableBlocksLong = statFs.availableBlocksLong
        val blockSizeLong = statFs.blockSizeLong
        return Formatter.formatFileSize(context, availableBlocksLong * blockSizeLong)
    }

    /**
     * 获取手机存储已使用率
     */
    fun getUsedMemorySizeRate(context: Context?): Int {
        val file = Environment.getDataDirectory()
        val statFs = StatFs(file.path)
        val blockSizeLong = statFs.blockSizeLong
        val blockCountLong = statFs.blockCountLong
        val availableBlocksLong = statFs.availableBlocksLong

        // 内部存储空间
        val memorySizeStr = Formatter.formatFileSize(
            context, blockCountLong * blockSizeLong)
        // 可用内部存储空间
        val availableMemorySizeStr = Formatter.formatFileSize(
            context, availableBlocksLong * blockSizeLong)

        val memorySize = memorySizeStr.filter {
            it.isDigit() || it.toString() == "."
        }.toFloat()

        val availableMemorySize = availableMemorySizeStr.filter {
            it.isDigit() || it.toString() == "."
        }.toFloat()

        return ((memorySize - availableMemorySize) / memorySize * 100).toInt()
    }
    
    /**
     * 获取已使用存储空间
     */
    fun getUsedMemorySize(context: Context?): String {
        val file = Environment.getDataDirectory()
        val statFs = StatFs(file.path)
        val blockSizeLong = statFs.blockSizeLong
        val blockCountLong = statFs.blockCountLong
        val availableBlocksLong = statFs.availableBlocksLong

        // 内部存储空间
        val memorySize = blockCountLong * blockSizeLong
        // 可用内部存储空间
        val availableMemorySize = availableBlocksLong * blockSizeLong

        return Formatter.formatFileSize(context, memorySize - availableMemorySize)
    }
}

Java 版本

https://blog.csdn.net/small_lee/article/details/50543068