Android10分区存储的适配规则

// 如果当前目录下没有 fileDirName 文件夹会自动创建
val file:File = context.getExternalFileDir("fileDirName") // fileDirName 文件夹名称
// /storage/emulated/0/Android/data/packageName/files/fileDirName

  val appFileDirName = applicationContext.getExternalFilesDir("fileDirName")&＃63;.absolutePath
  val newFile = File(appFileDirName, "temp.txt")
  val fileWriter = FileWriter(newFile)
  fileWriter.write("test information")
  fileWriter.flush()
  fileWriter.close()

    /**
     * @param fileName 文件名称
     * @param relativePath 包含某个媒体下的子路径
     */
    fun insertFileIntroMediaStore(
        context: Context,
        fileName: String,
        relativePath: String
    ): Uri&＃63; {
        if (Build.VERSION.SDK_INT 

    /**
     * 获取文件输出流 by uri
     * @param context 上下文
     * @param uri 文件路径
     */
    fun getInputStreamByUri(context: Context, uri: Uri&＃63;): InputStream&＃63; {
        uri &＃63;: return null
        val openFileDescriptor = context.contentResolver.openFileDescriptor(uri, "r")
        return FileInputStream(openFileDescriptor&＃63;.fileDescriptor)
    }