Develop Reference

how to solve an error with a cursor in Kotlin?

I'm newbie in Kotlin programming and I'm building a function to get a file from an URI, like this:
fun getFileFromUri(context: Context, uri: Uri): File? {
var path: String? = null
// DocumentProvider
return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
if (DocumentsContract.isDocumentUri(context, uri)) { // TODO: 2015. 11. 17. KITKAT
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
val docId = DocumentsContract.getDocumentId(uri)
val split = docId.split(":".toRegex()).dropLastWhile { it.isEmpty() }
.toTypedArray()
val type = split[0]
if ("primary".equals(type, ignoreCase = true)) {
path = Environment.getExternalStorageDirectory().absolutePath + "/" + split[1]
}
// TODO handle non-primary volumes
} else if (isDownloadsDocument(uri)) { // DownloadsProvider
val id = DocumentsContract.getDocumentId(uri)
val contentUri: Uri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"),
java.lang.Long.valueOf(id)
)
path = getDataColumn(context, contentUri, null, null)
} else if (isMediaDocument(uri)) { // MediaProvider
val docId = DocumentsContract.getDocumentId(uri)
val split = docId.split(":".toRegex()).dropLastWhile { it.isEmpty() }
.toTypedArray()
val type = split[0]
var contentUri: Uri? = null
if ("image" == type) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
} else if ("video" == type) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI
} else if ("audio" == type) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
}
val selection = "_id=?"
val selectionArgs = arrayOf(
split[1]
)
path = getDataColumn(context, contentUri!!, selection, selectionArgs)
} // MediaStore (and general)
} else if ("content".equals(uri.getScheme(), ignoreCase = true)) {
path = getDataColumn(context, uri, null, null)
} else if ("file".equals(uri.getScheme(), ignoreCase = true)) {
path = uri.getPath()
}
File(path)
} else {
val cursor: Cursor = context.getContentResolver().query(uri, null, null, null, null)!!
File(cursor.getString(cursor.getColumnIndex("_data")))
}
}
However, the last line, File(cursor.getString(cursor.getColumnIndex("_data"))), shows this error:
Value must be ≥ 0 but getColumnIndex can be -1
The code and the apk works, but I'm worried it may fail in the future. I try to add an:
if (cursor != null && cursor.moveToFirst()) {
...}
but it also shows an error. I'm not sure if it needs to return something but anyway, I'm not sure if the solution goes on that direction.

Kotlin convert uri to filepath

I'm using Kotlin, and in converting the file uri to a file, the file uri value starts with content://, so I can't access it. So you need to know the absolute path.
There are many java codes, but the code for kotlin does not exist, so I tried to convert it, but an error occurs in kotlin. Please help me
Not only Image file I want all type files
Thanks a lot

There is a separate mechanism for getting path from URI in the versions below Kitkat (getDataColumn(...) method will serve the purpose as gets the file path using ContentResolver).
In the versions above the Kitkat, we have to implement a separate logic for different file types, either they are picked from documents directory, Gallery, or downloads folder.
URIPathHelper.kt
import android.content.Context
import android.database.Cursor
import android.net.Uri
import android.os.Build
import android.os.Environment
import android.provider.DocumentsContract
import android.provider.MediaStore
class URIPathHelper {
fun getPath(context: Context, uri: Uri): String? {
val isKitKatorAbove = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT
// DocumentProvider
if (isKitKatorAbove && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
val docId = DocumentsContract.getDocumentId(uri)
val split = docId.split(":".toRegex()).toTypedArray()
val type = split[0]
if ("primary".equals(type, ignoreCase = true)) {
return Environment.getExternalStorageDirectory().toString() + "/" + split[1]
}
} else if (isDownloadsDocument(uri)) {
val id = DocumentsContract.getDocumentId(uri)
val contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), java.lang.Long.valueOf(id))
return getDataColumn(context, contentUri, null, null)
} else if (isMediaDocument(uri)) {
val docId = DocumentsContract.getDocumentId(uri)
val split = docId.split(":".toRegex()).toTypedArray()
val type = split[0]
var contentUri: Uri? = null
if ("image" == type) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
} else if ("video" == type) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI
} else if ("audio" == type) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
}
val selection = "_id=?"
val selectionArgs = arrayOf(split[1])
return getDataColumn(context, contentUri, selection, selectionArgs)
}
} else if ("content".equals(uri.scheme, ignoreCase = true)) {
return getDataColumn(context, uri, null, null)
} else if ("file".equals(uri.scheme, ignoreCase = true)) {
return uri.path
}
return null
}
fun getDataColumn(context: Context, uri: Uri?, selection: String?, selectionArgs: Array<String>?): String? {
var cursor: Cursor? = null
val column = "_data"
val projection = arrayOf(column)
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,null)
if (cursor != null && cursor.moveToFirst()) {
val column_index: Int = cursor.getColumnIndexOrThrow(column)
return cursor.getString(column_index)
}
} finally {
if (cursor != null) cursor.close()
}
return null
}
fun isExternalStorageDocument(uri: Uri): Boolean {
return "com.android.externalstorage.documents" == uri.authority
}
fun isDownloadsDocument(uri: Uri): Boolean {
return "com.android.providers.downloads.documents" == uri.authority
}
fun isMediaDocument(uri: Uri): Boolean {
return "com.android.providers.media.documents" == uri.authority
}
}
You can later use it like
val uriPathHelper = URIPathHelper()
val filePath = uriPathHelper.getPath(this, user_uri)

How do you get the path of the android documents directory in android q?

I'm struggling to find a clear answer to this question. I know it somehow involves using media store but I can't quite work it out.
Thank you.
Edit: if it helps, I'm using a Pixel 2 at the moment.

If you are targeting to Android 11 API, you cannot directly get access to the file paths, as there are many restrictions in API 30(Android R). As scoped storage API was introduced in Android 10(API 29), the storage is now divided into scoped storage(private storage) and shared storage(public storage). Scoped storage is a kind you can only have access to the files that are created in your scoped storage directory(i.e. /Android/data/ or /Android/media/). You cannot access files from shared storage (i.e. internal storage/external SD card storage etc.)
The shared storage is again further divided into Media and Download collection. Media collection stores Image, Audio and Video files. Download collection would take care of non-media files.
To learn in more details about scoped storage and shared storage refer this link- Scoped Storage in Android 10 & Android 11 .
To get the document directory path, I have created URI utils class that will get the path for the file from URI.
import android.content.ContentUris
import android.content.Context
import android.database.Cursor
import android.net.Uri
import android.os.Build
import android.os.Environment
import android.provider.DocumentsContract
import android.provider.MediaStore
import android.provider.OpenableColumns
import android.util.Log
import android.widget.Toast
import java.io.File
import java.io.FileOutputStream
class UriPathUtils
{
fun getRealPathFromURI(context: Context, uri: Uri): String? {
when {
// DocumentProvider
DocumentsContract.isDocumentUri(context, uri) -> {
when {
// ExternalStorageProvider
isExternalStorageDocument(uri) -> {
//Toast.makeText(context, "From Internal & External Storage dir", Toast.LENGTH_SHORT).show()
val docId = DocumentsContract.getDocumentId(uri)
val split = docId.split(":").toTypedArray()
val type = split[0]
// This is for checking Main Memory
return if ("primary".equals(type, ignoreCase = true)) {
if (split.size > 1) {
Environment.getExternalStorageDirectory().toString() + "/" + split[1]
} else {
Environment.getExternalStorageDirectory().toString() + "/"
}
// This is for checking SD Card
} else {
"storage" + "/" + docId.replace(":", "/")
}
}
isDownloadsDocument(uri) -> {
//Toast.makeText(context, "From Downloads dir", Toast.LENGTH_SHORT).show()
val fileName = getFilePath(context, uri)
if (fileName != null) {
return Environment.getExternalStorageDirectory().toString() + "/Download/" + fileName
}
var id = DocumentsContract.getDocumentId(uri)
if (id.startsWith("raw:")) {
id = id.replaceFirst("raw:".toRegex(), "")
val file = File(id)
if (file.exists()) return id
}
val contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), java.lang.Long.valueOf(id))
return getDataColumn(context, contentUri, null, null)
}
isMediaDocument(uri) -> {
//Toast.makeText(context, "From Documents dir", Toast.LENGTH_SHORT).show()
val docId = DocumentsContract.getDocumentId(uri)
val split = docId.split(":").toTypedArray()
val type = split[0]
var contentUri: Uri? = null
when (type) {
"image" -> {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
}
"video" -> {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI
}
"audio" -> {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
}
else -> {
//non-media files i.e documents and other files
contentUri = MediaStore.Files.getContentUri("external")
val selection = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
MediaStore.MediaColumns.RELATIVE_PATH + "=?"
} else "_id=?"
val selectionArgs = arrayOf(Environment.DIRECTORY_DOCUMENTS)
return getMediaDocumentPath(context, contentUri,selection,selectionArgs)
}
}
val selection = "_id=?"
val selectionArgs = arrayOf(split[1])
return getDataColumn(context, contentUri, selection, selectionArgs)
}
isGoogleDriveUri(uri) -> {
Toast.makeText(context, "From Google Drive", Toast.LENGTH_SHORT).show()
return getDriveFilePath(uri, context)
}
/*else -> {
Toast.makeText(context, "Unknown Directory", Toast.LENGTH_SHORT).show()
}*/
}
}
"content".equals(uri.scheme, ignoreCase = true) -> {
//Toast.makeText(context, "From Content Uri", Toast.LENGTH_SHORT).show()
// Return the remote address
return if (isGooglePhotosUri(uri)) uri.lastPathSegment else getDataColumn(context, uri, null, null)
}
"file".equals(uri.scheme, ignoreCase = true) -> {
//Toast.makeText(context, "From File Uri", Toast.LENGTH_SHORT).show()
return uri.path
}
}
return null
}
private fun getDataColumn(context: Context, uri: Uri?, selection: String?, selectionArgs: Array<String>?): String? {
var cursor: Cursor? = null
val column = "_data"
val projection = arrayOf(column)
try {
if (uri == null) return null
cursor = context.contentResolver.query(uri, projection, selection, selectionArgs, null)
if (cursor != null && cursor.moveToFirst()) {
val index = cursor.getColumnIndexOrThrow(column)
return cursor.getString(index)
}
} finally {
cursor?.close()
}
return null
}
private fun getMediaDocumentPath(context: Context, uri: Uri?,selection: String?, selectionArgs: Array<String>?): String? {
var cursor: Cursor? = null
val column = "_data"
val projection = arrayOf(column)
try {
if (uri == null) return null
cursor = context.contentResolver.query(uri, projection, selection, selectionArgs, null)
if (cursor != null && cursor.moveToFirst()) {
val index = cursor.getColumnIndexOrThrow(column)
//Toast.makeText(context, "From Media Document --- Non Media Path ${cursor.getString(index)} ", Toast.LENGTH_SHORT).show()
return cursor.getString(index)
}
} finally {
cursor?.close()
}
return null
}
private fun getFilePath(context: Context, uri: Uri?): String? {
var cursor: Cursor? = null
val projection = arrayOf(MediaStore.MediaColumns.DISPLAY_NAME)
try {
if (uri == null) return null
cursor = context.contentResolver.query(uri, projection, null, null,
null)
if (cursor != null && cursor.moveToFirst()) {
val index = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DISPLAY_NAME)
return cursor.getString(index)
}
} finally {
cursor?.close()
}
return null
}
private fun getDriveFilePath(uri: Uri, context: Context): String? {
val returnCursor = context.contentResolver.query(uri, null, null, null, null)
val nameIndex = returnCursor!!.getColumnIndex(OpenableColumns.DISPLAY_NAME)
val sizeIndex = returnCursor.getColumnIndex(OpenableColumns.SIZE)
returnCursor.moveToFirst()
val name = returnCursor.getString(nameIndex)
val size = returnCursor.getLong(sizeIndex).toString()
val file = File(context.cacheDir, name)
try {
val inputStream = context.contentResolver.openInputStream(uri)
val outputStream = FileOutputStream(file)
var read = 0
val maxBufferSize = 1 * 1024 * 1024
val bytesAvailable = inputStream!!.available()
//int bufferSize = 1024;
val bufferSize = Math.min(bytesAvailable, maxBufferSize)
val buffers = ByteArray(bufferSize)
while (inputStream.read(buffers).also { read = it } != -1) {
outputStream.write(buffers, 0, read)
}
Log.e("File Size", "Size " + file.length())
inputStream.close()
outputStream.close()
Log.e("File Path", "Path " + file.path)
Log.e("File Size", "Size " + file.length())
} catch (e: Exception) {
Log.e("Exception", e.message!!)
}
return file.path
}
/**
* #param uri The Uri to check.
* #return Whether the Uri authority is ExternalStorageProvider.
*/
private fun isExternalStorageDocument(uri: Uri): Boolean {
return "com.android.externalstorage.documents" == uri.authority
}
/**
* #param uri The Uri to check.
* #return Whether the Uri authority is DownloadsProvider.
*/
private fun isDownloadsDocument(uri: Uri): Boolean {
return "com.android.providers.downloads.documents" == uri.authority
}
/**
* #param uri The Uri to check.
* #return Whether the Uri authority is MediaProvider.
*/
private fun isMediaDocument(uri: Uri): Boolean {
return "com.android.providers.media.documents" == uri.authority
}
/**
* #param uri The Uri to check.
* #return Whether the Uri authority is Google Photos.
*/
private fun isGooglePhotosUri(uri: Uri): Boolean {
return "com.google.android.apps.photos.content" == uri.authority
}
/**
* #param uri The Uri to check.
* #return Whether the Uri authority is Google Photos.
*/
private fun isGoogleDriveUri(uri: Uri): Boolean {
return "com.google.android.apps.docs.storage" == uri.authority || "com.google.android.apps.docs.storage.legacy" == uri.authority
}
}
This utils class will help you to get your file path, by just calling this line ..
contentUri.let { UriPathUtils().getRealPathFromURI(this, it).toString() }
Cheers...!

Uri contentUri = MediaStore.Files.getContentUri("external");
String selection = MediaStore.MediaColumns.RELATIVE_PATH + "=?";
String[] selectionArgs = new String[]{Environment.DIRECTORY_DOCUMENTS};
Cursor cursor = getContentResolver().query(contentUri, null, selection, selectionArgs, null);

Android File Picker to get real file path from installed application files

I am trying to open file picker and select files from installed applications. In this case I am trying to access scanned file from Adobe Scan. When I choose file I get following uri
content://com.adobe.scan.android.documents/document/root:1
But now I want to get file from this uri which I couldn't. I am using following class to get Real File Path. I dont know what logic I should add here which can access files from third party apps.
object RealFilePath {
fun getFile(context: Context, fileUri: Uri): File {
return File(getRealPathFromURI(context, fileUri)!!)
}
private fun getRealPathFromURI(context: Context, uri: Uri): String? {
val isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
if (isExternalStorageDocument(uri)) {
val docId = DocumentsContract.getDocumentId(uri)
val split = docId.split(":").toTypedArray()
val type = split[0]
if ("primary".equals(type, ignoreCase = true)) {
return Environment.getExternalStorageDirectory().toString() + "/" + split[1]
}
// TODO handle non-primary volumes
} else if (isDownloadsDocument(uri)) {
val id = DocumentsContract.getDocumentId(uri)
val contentUri: Uri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), java.lang.Long.valueOf(id)
)
return getDataColumn(context, contentUri, null, null)
} else if (isMediaDocument(uri)) {
val docId = DocumentsContract.getDocumentId(uri)
val split = docId.split(":").toTypedArray()
val type = split[0]
var contentUri: Uri? = null
if ("image" == type) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
} else if ("video" == type) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI
} else if ("audio" == type) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
}
val selection = "_id=?"
val selectionArgs = arrayOf(
split[1]
)
return getDataColumn(context, contentUri, selection, selectionArgs)
}
} else if ("content".equals(
uri.scheme,
ignoreCase = true
)
) {
return if (isGooglePhotosUri(uri)) uri.lastPathSegment else getDataColumn(
context,
uri,
null,
null
)
} else if ("file".equals(uri.scheme, ignoreCase = true)) {
return uri.path
}
return null
}
private fun getDataColumn(
context: Context, uri: Uri?, selection: String?,
selectionArgs: Array<String>?
): String? {
var cursor: Cursor? = null
val column = "_data"
val projection = arrayOf(
column
)
try {
cursor = context.contentResolver.query(
uri!!, projection, selection, selectionArgs,
null
)
if (cursor != null && cursor.moveToFirst()) {
val index: Int = cursor.getColumnIndexOrThrow(column)
return cursor.getString(index)
}
} finally {
cursor?.close()
}
return null
}
private fun isExternalStorageDocument(uri: Uri): Boolean {
return "com.android.externalstorage.documents" == uri.authority
}
private fun isDownloadsDocument(uri: Uri): Boolean {
return "com.android.providers.downloads.documents" == uri.authority
}
private fun isMediaDocument(uri: Uri): Boolean {
return "com.android.providers.media.documents" == uri.authority
}
private fun isGooglePhotosUri(uri: Uri): Boolean {
return "com.google.android.apps.photos.content" == uri.authority
}
}
Please help me with this logic or is there any library which can give me real file paths.

Getting null pointer exception error in getting image path from URI

I using the the following code to get open the image picker:
val intent = Intent(Intent.ACTION_GET_CONTENT).apply {
type = "image/*"
}
startActivityForResult(intent, REQUEST_IMAGE_PICK)
I then use a standard piece of code to get the image from the URI which is as follows (it is in onActivity result):
val uri:Uri = data.data
val imageP = getPath(context!!,uri)
// Glide.with(this)
// .load(data.data)
// .apply(GlobalSiteRecords.options)
// .into(companyImageView)
// return
**imagePath = Uri.parse(imageP).toString()// NULL POINTER EXCEPTION HERE**
// following function loads the image and saves the path
loadImageAndStoreImagePath(imagePath)
} catch(e:Exception){
e.printStackTrace()
val a = Toast.makeText(activity,"Error reading file, please try a different file!",Toast.LENGTH_SHORT)
a.setGravity(Gravity.FILL_HORIZONTAL,0,0)
a.show()
}
Get path function is the following:
fun getPath(context: Context, uri: Uri): String? {
val isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
val docId = DocumentsContract.getDocumentId(uri)
val split = docId.split(":".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
val type = split[0]
if ("primary".equals(type, ignoreCase = true)) {
return Environment.getExternalStorageDirectory().toString() + File.separator + split[1]
}
// TODO handle non-primary volumes
} else if (isDownloadsDocument(uri)) {
val id:String = DocumentsContract.getDocumentId(uri)
val contentUri:Uri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), java.lang.Long.valueOf(id))
return getDataColumn(context, contentUri, null, null)
} else if (isMediaDocument(uri)) {
val docId:String = DocumentsContract.getDocumentId(uri)
val split = docId.split(":".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray()
val type = split[0]
var contentUri: Uri? = null
if ("image" == type) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
} else if ("video" == type) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI
} else if ("audio" == type) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI
}
val selection = "_id=?"
val selectionArgs = arrayOf(split[1])
return getDataColumn(context, contentUri, selection, selectionArgs)
}// MediaProvider
// DownloadsProvider
} else if ("content".equals(uri.getScheme(), ignoreCase = true)) {
// Return the remote address
return if (isGooglePhotosUri(uri)) uri.getLastPathSegment() else getDataColumn(context, uri, null, null)
} else if ("file".equals(uri.getScheme(), ignoreCase = true)) {
return uri.getPath()
}// File
// MediaStore (and general)
return null
}
/**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* #param context The context.
* #param uri The Uri to query.
* #param selection (Optional) Filter used in the query.
* #param selectionArgs (Optional) Selection arguments used in the query.
* #return The value of the _data column, which is typically a file path.
*/
fun getDataColumn(context: Context, uri: Uri?, selection: String?,
selectionArgs: Array<String>?): String? {
var cursor: Cursor? = null
val column = "_data"
val projection = arrayOf(column)
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null)
if (cursor != null && cursor.moveToFirst()) {
val index = cursor.getColumnIndexOrThrow(column)
return cursor.getString(index)
}
} finally {
if (cursor != null)
cursor.close()
}
return null
}
/**
* #param uri The Uri to check.
* #return Whether the Uri authority is ExternalStorageProvider.
*/
fun isExternalStorageDocument(uri: Uri): Boolean {
return "com.android.externalstorage.documents".equals(uri.getAuthority())
}
/**
* #param uri The Uri to check.
* #return Whether the Uri authority is DownloadsProvider.
*/
fun isDownloadsDocument(uri: Uri): Boolean {
return "com.android.providers.downloads.documents".equals(uri.getAuthority())
}
/**
* #param uri The Uri to check.
* #return Whether the Uri authority is MediaProvider.
*/
fun isMediaDocument(uri: Uri): Boolean {
return "com.android.providers.media.documents".equals(uri.getAuthority())
}
/**
* #param uri The Uri to check.
* #return Whether the Uri authority is Google Photos.
*/
fun isGooglePhotosUri(uri: Uri): Boolean {
return "com.google.android.apps.photos.content".equals(uri.getAuthority())
}
}
}
I am not sure what the problem is here. I tried loading the image using URI and Glide directly before processing for imagepath and it works fine but unfortunately if I don't have imagepath I cannot save a copy of the image which is what I want to do.