错误：java.io.IOException：android 11 中没有此类文件或目录

Question

I am trying to create a file on the file system, but I still get this exception:

private fun getTempFolder(): File {
        val directoryFolder =
            File(Environment.getExternalStorageDirectory(), "sample-take-image")
        directoryFolder.mkdirs()
        return directoryFolder
    }
    private fun getTempFile(): File {
        val timeStamp = SimpleDateFormat("yyyyMMdd_HHMMss", Locale.getDefault()).format(Date())
        return File(
            getTempFolder().absolutePath,
            "image".plus(Calendar.getInstance().timeInMillis).plus(timeStamp).plus(".jpg")
        )
    }
    private fun saveImageToFile(bitmap: Bitmap? = null): String? {
        return try {
            val file = getTempFile()
            Timber.e("Path: + : ${file.absolutePath}")
            file.createNewFile()
            val fOut = FileOutputStream(file)
            bitmap?.apply {
                this.compress(Bitmap.CompressFormat.JPEG, 100, fOut)
            }
            fOut.flush()
            fOut.close()
            file?.absolutePath.getDefault()
        } catch (e: Exception) {
            e.printStackTrace()
            ""
        }
    }

Even though I got the link after taking the photo camare:

: /storage/emulated/0/sample-take-image/image162064003789420210510_160517.jpg

So can someone tell me why I can't create the file in this case. I am currently on Android 11 with

**compileSdkVersion 30

buildToolsVersion "30.0.2"

minSdkVersion 26**

Answer 1

On An Android 11 device you cannot create directories or files in root of external storage.

But you can in all public directories that are already there.

File(Environment.getExternalStorageDirectory(), "sample-take-image")

Replace for instance by:

File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS), "sample-take-image")

Answer 2

Use getExternalFilesDir(), getExternalCacheDir(), or getExternalMediaDirs() (methods on Context) instead of Environment.getExternalStorageDirectory() as this is deprecated.

Answer 3

String dirPath;
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
                dirPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS).getAbsolutePath() + "/" + getString(R.string.app_name) + "/";
            } else {
                dirPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + getString(R.string.app_name) + "/";
            }