如何在 android API LEVEL28 使用 Android SAF（存储访问框架）后将文档文件保存在外部存储中

Question

此代码适用于媒体文件我想要文档文件的解决方案

我不知道如何为文档文件设置内容值

fun getFile(fileName: String): File? {
    with(sharePrefHelper.app){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
            val values = ContentValues()
            // Here is My Question That what should i Do Here Because this is for document not for image
            values.put(MediaStore.Images.Media.DISPLAY_NAME, fileName)
            // for MIME_TYPE "image/jpg" this is working
            values.put(MediaStore.Images.Media.MIME_TYPE, "text/csv")
            values.put(MediaStore.MediaColumns.RELATIVE_PATH, "DCIM/Donny")
            contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values)?.let {
                it.path?.let { finalPath ->
                    return File(finalPath)
                }
            }
        } else {
            val directory: File = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM + "/Donny")
            if (!directory.exists()){
                directory.mkdirs()
            }
            return File(directory, fileName)
        }
        return null
    }
}

此代码适用于媒体文件

我的问题是如何将 CSV 文件等文档保存在 android 设备的外部文件夹中

Answer 1

编辑：

好吧好吧，我仍在尝试在“下载”目录中添加任何类型的文件。 Personnaly，我正在尝试从我的 assetFolder 复制一个文件并将其粘贴到“下载”文件夹。我还没有成功。但是，我目前可以在该文件夹中创建任何类型的文件，它正在使用以下方法。希望对您有所帮助。

这是我的代码：

    public void saveFileToPhone(InputStream inputStream, String filename) {
    OutputStream outputStream;
    Context myContext = requireContext();
    try {
        if(Build.VERSION.SDK_INT >=Build.VERSION_CODES.Q){
            ContentResolver contentResolver = requireContext().getContentResolver();
            ContentValues contentValues = new ContentValues();
            contentValues.put(MediaStore.Downloads.DISPLAY_NAME,filename);
            contentValues.put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_DOWNLOADS);
            Uri collection = MediaStore.Downloads.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY);
            Uri fileUri = contentResolver.insert(collection, contentValues);
            outputStream = contentResolver.openOutputStream(Objects.requireNonNull(fileUri));
            Objects.requireNonNull(outputStream);

        }
    }catch (FileNotFoundException e) {

        e.printStackTrace();
    }
}

Answer 2

这是我用干净的方式所做的

这是文件提供者activity

class FileProviderActivity : AppCompatActivity() {

    var commonIntentLauncher: ActivityResultLauncher<Intent?> = registerForActivityResult(
        ActivityResultContracts.StartActivityForResult()) { result ->
        if (result.resultCode == Activity.RESULT_OK) {
            result.data?.let {
                intent.getParcelableExtra<ResultReceiver>("FileReceiver")?.send(0, bundleOf(
                    "FileUri" to result?.data?.data.toString()
                ))
                finish()
            }
        }
    }


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q){
            val activityIntent = Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
                addCategory(Intent.CATEGORY_OPENABLE)
                type = intent.getStringExtra("fileType")
                putExtra(Intent.EXTRA_TITLE, intent.getStringExtra("fileName"))
                putExtra(DocumentsContract.EXTRA_INITIAL_URI, MediaStore.Downloads.EXTERNAL_CONTENT_URI)
            }
            commonIntentLauncher.launch(activityIntent)
        }else{
            val directory: File = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS + "/Dunny/CSVFiles")
            if (!directory.exists()){
                directory.mkdirs()
            }

            intent.getParcelableExtra<ResultReceiver>("FileReceiver")?.send(0, bundleOf(
                "FileUri" to File(directory, intent.getStringExtra("fileName")!!).toURI().toString()
            ))
            finish()
        }
    }
}

这个 FileProviderHelper

class MyFileProvider {

    companion object {
        fun with(context: Context) = FileRequest(context)
    }

    class FileRequest(private val context: Context) {

        fun request(fileName: String, fileType: String = "application/*", file: (Uri?) -> Unit ) {
            val intent = Intent(context, FileProviderActivity::class.java)
                .addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP)
                .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                .putExtra("fileName",fileName)
                .putExtra("fileType", fileType)
                .putExtras(bundleOf("FileReceiver" to FileReceiver(file)))
            context.startActivity(intent)
        }
    }

    internal class FileReceiver(private val file: (Uri?) -> Unit) : ResultReceiver(Handler(Looper.getMainLooper())) {
        override fun onReceiveResult(resultCode: Int, resultData: Bundle?) {
            super.onReceiveResult(resultCode, resultData)
            resultData?.let {
                file(it.getString("FileUri")?.toUri())
            }
        }
    }
}

这里是这个函数的使用

MyFileProvider.with(this).request("TestFile.csv","application/*") { fileUri ->
    toast(fileUri.toString())
}

如何在 android API LEVEL28 使用 Android SAF（存储访问框架）后将文档文件保存在外部存储中

How to save Document file in external storage after android API LEVEL28 With Android SAF(Storage Access Framework))

android

android-storage