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Android SD card writing, Permission Denied
(5 answers)
Closed 10 years ago.
i'm unable to write into the external sd ( /mnt/extsd ) in mini x plus h24
i have already insert in the manifest
The system has two sd card, the first one is reachable with Environment.getExternalStorageDirectory() but the second is only reachable with absolute path
try{
File file3 = new File("/mnt/extsd/", "file.txt");
BufferedWriter writer = new BufferedWriter(new FileWriter(file3));
writer.write("hello");
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
The exception return me this message
/mnt/extsd/file.txt: open failed: EACCES (Permissio denied)
Any suggestions?
add below permission in android manifest file.
Write Permission
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Read Permission
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
You need to add the permission
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
in your AndroidManifest.xml file.
EDIT
If you have already added that permission and still getting permission denied error, you might be writing to a read only directory or you're not allowed to write on the root of that directory.
You may want to check if the directory is writeable. Somthing like:
file3.canWrite()
or you may try adding a child directory, before writing
File newDir = new File("/mnt/extsd/myFiles");
newDir.mkdirs();
File file3 = new File(newDir.getAbsolutePath(), "file.txt");
Simple just add the permission in android manifest file.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
if you have already added the permissions in the manifest file then,
try with these:
1) File file1 = new File(Environment.getExternalStorageDirectory() + "file.txt");
2) File file2 = new File("file:///mnt/extsd/", "file.txt");
3) File file3 = new File("file:///mnt/sdcard/", "file.txt");
and then use
String filepath = "file:///" + file1.getAbsolutePath();
Related
Hello I am trying to create a csv file in my android application. My code works when I try to run it on android 10 below. But I cant seem to find a problem why I cant do it on devices that are Android 11 already.
Here is my Manifest Permissions:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
android:maxSdkVersion="30" />
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
<application
...
android:requestLegacyExternalStorage="true">
Here is my code where I create a folder inside the download folder
#NonNull
public static File getStorageDirectory() {
if (Environment.getExternalStorageState() == null) {
File f = new File(Environment.getDataDirectory().getAbsolutePath() + "/Download/(Project Name)/");
if(!f.exists())
f.mkdirs();
return f;
} else {
File f = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Download/(Project Name)/");
if(!f.exists())
f.mkdirs();
return f;
}
}
Here is my code on how I create my csv file
File baseDir = Utility.getStorageDirectory();
String fileName = pollutant.getStationName();
String date = Utility.convertDate(new Date().getTime(), "dd-MM-yyyy HH:mm:ss");
File csvFile = new File(baseDir, fileName + "(1hr - "+pollutant.getPollutantName()+")(" + date + ").csv");
FileWriter writer;
if(csvFile.exists() && !csvFile.isDirectory()) {
writer = new FileWriter(csvFile , true);
} else {
writer = new FileWriter(csvFile);
}
I am already creating a folder in the download folder in android 11 problem is when I am trying to do the create csv part program return a
java.io.FileNotFoundException: ... open failed: EPERM (Operation not permitted)
I am really having a hard time to fix my problem for devices with android 11
"dd-MM-yyyy HH:mm:ss"
You have a forbidden character in your file name.
A : is not allowed.
Change to "dd-MM-yyyy HH.mm.ss" or so.
I believe that this a permission issue. In Order to Write into files you need to allow it.
Here is example of the code:
public void onPermission()
{
// Permision can add more at your convinient
if ((ContextCompat.checkSelfPermission(this,
Manifest.permission.WRITE_EXTERNAL_STORAGE)) !=
PackageManager.PERMISSION_GRANTED)
{
ActivityCompat.requestPermissions(
this,
new String[]
{
Manifest.permission.READ_CONTACTS,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.ACCESS_COARSE_LOCATION,
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.BLUETOOTH,
Manifest.permission.CAMERA,
Manifest.permission.CALL_PHONE
},
0
);
}
}
Usage :
onPermission(); at onStart() or in the onAcitivty().
Alternatively you can use a library as well ,
Reference : https://github.com/Karumi/Dexter
For External Storage:
Add attribute in your app's AndroidManifest.xml file inside the application tag:
android:requestLegacyExternalStorage="true"
eg.
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme"
android:requestLegacyExternalStorage="true">
...
</application>
For More Reference : https://stackoverflow.com/a/61406983/10758321
I have a similar behavior in my “SFTP Server s0 v1” app and the problem respective the allowed characters in file- and directory-names is related to the underlying file system – see Comparison of file systems . You can check which file system is mounted to which directory by calling adb shell mount. For example creating a file in your application home directory (e.g. /data/data/ch.becke.sftp_server__s0_v1/files) is no issue because the /data directory is mounted as ext4 (/dev/block/dm-5 on /data type ext4 ...) which allows almost all characters in file names. Whereas the external storage directory (e.g. /storage/emulated/0 or /storage/140E-3C1A) is mounted as vfat or fuse which only allows a limited set of characters in file names. (in my app I alternatively also support managing files using scoped storage but I personally think this is even worse because it auto replaces all special characters with an underscore character _).
I am trying to create a file. (testipfs folder already exists)
File imagesFolder = new File(Environment.getExternalStorageDirectory(), "testipfs");
File photo= new File(imagesFolder, "desktopWallpaper.jpg");
System.out.println("Saving file in "+photo.getAbsolutePath());
if (!photo.exists()) {
try {
photo.createNewFile();
} catch (IOException e) {
System.out.println("Failed to create photo");
e.printStackTrace();
}
}
But getting error Operation not permitted.
I/System.out: Saving file in /storage/emulated/0/testipfs/desktopWallpaper.jpg
I/System.out: Failed to create photo
W/System.err: java.io.IOException: Operation not permitted
W/System.err: at java.io.UnixFileSystem.createFileExclusively0(Native Method)
at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:317)
at java.io.File.createNewFile(File.java:1008)
at com.example.ipfs.MainActivity.SavePhotoTask(MainActivity.java:49)
at com.example.ipfs.MainActivity.onCreate(MainActivity.java:112)
I have added permission in my manifest file as bellow
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
How do i solve this problem?
I am expecting you are testing your application in android 11, In Android 11 things changed ... You have to ask for this permission
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>
and in you MainActivity
if (Build.VERSION.SDK_INT >= 30){
if (!Environment.isExternalStorageManager()){
Intent getpermission = new Intent();
getpermission.setAction(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION);
startActivity(getpermission);
}
}
Basically this is just an intent which will take user to setting to give us Permission, and this is necessary in android 11 , If you just asking for READ nd WRITE permission then you application is having just a read-only access to files in the device
Try to add requestLegacyExternalStorage in Manifest.xml file, if you are using Android 10 or later versions.
<application
...
android:requestLegacyExternalStorage="true">
Use this
File imagesFolder = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_DOWNLOADS), "testipfs");
File photo = new File(imagesFolder, "desktopWallpaper.jpg");
Declaring permissions in the Manifest file is not enough if you are using Android Marshmallow and above, before you write or read any external files you need to request the appropriate permissions explicitly.
storage-permission-error-in-marshmallow
Documentation
If this doesn't work try setting your targetSdkVersion to 28 or less.
I had special characters in my directory name (specifically ":"). Removing this allowed me to save the file
After countless searching I've managed to find path to my sdcard not the android emulated storage. But when I try to make .txt folder there it ends up with error
/storage/37F0-1515/DCIM/100MEDIA/test.txt: open failed: EACCES (Permission denied)
I don't know why because I have permissions for
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
and also I've enabled the permissions with
if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, request2);
}
Here is the code that I'm using
File sdCard = new File("/storage/37F0-1515/DCIM/100MEDIA");
File dir = new File(sdCard.getAbsolutePath());
if (!dir.exists()) {
dir.mkdirs();
}
final File file = new File(dir, "test" + ".txt");
try {
BufferedWriter bufferedWriter = null;
bufferedWriter = new BufferedWriter(new FileWriter(file));
bufferedWriter.write("test");
bufferedWriter.close();
}
catch(Exception e){Log.v("myApp", e.toString());}
I don't know why android won't let me write to sdcard. Do I need some other permissions ?
I don't know why because I have permissions for
Those permissions are for external storage, not removable storage.
I don't know why android won't let me write to sdcard
You do not have arbitrary filesystem access to removable storage on Android 4.4+.
Try using these methods-
Check if the uses-permission statements are in the right place, they should be below <manifest> and above <application> tags. The correct format -
<manifest>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
...
<application>
...
<activity>
...
</activity>
</application>
</manifest>
Starting from Android Kitkat, there is a new storage policy -
The WRITE_EXTERNAL_STORAGE permission must only grant write access to the primary external storage on a device. Apps must not be allowed to write to secondary external storage devices, except in their package-specific directories as allowed by synthesized permissions. Restricting writes in this way ensures the system can clean up files when applications are uninstalled.
This can however be exploited without rooting(although I have not tried this one), as mentioned here
EDIT -
The above mentioned exploit won't work for Android 5+. There is no standard solution to this problem. Some exploits may be available but they will be device-specific/not reliable/root-access dependent.
However, tools like the Storage Access Framework can be used.
In my application, while writing a file sdcard it shows Permission denied. But i give permission in sdcard. Please help?
Writing file code:
File sdcard = Environment.getExternalStorageDirectory();
File f = new File(sdcard, "/abc.txt");
if (f.exists()) {
f.delete();
}
Manifest :
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
Thanks in advance!!
You need add use-permission in AndroidManifest file, and you should better check if you can r/w the file use canWrite() canRead() before use it.
I think your SD card is currently connect to your computer so it will cause problem. I get in this situation before. You need to unmount sd card first
it requires permissions in manifest file, add this line to your manifest file
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
Look at this Question Android saving file to external storage
in menifest file add permission to write file
pls try with file name as below
String filename="aa.txt";
String filepath= getFilesDir().getAbsolutePath();
File Filseting = new File(filepath, filename);
I'm trying to upload a file to web server.But i'm having file not found exception.I think error comes from the path which i defined.my path is Sd card/Android/data/ic_launcher.png
Can anyone help me to give the path correctly.Please guys....
Try this.
File file = new File(Environment.getExternalStorageDirectory(), "Android/data/ic_launcher.png");
add this permission in manifest file.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
String SD_Card_Path = Environment.getExternalStorageDirectory().toString();
String Complete_Path = SD_Card_Path + "/Android/data/ic_launcher.png";
This is the tested code Add External Storage Read/Write Permission in your AndroidMenifest and your code will be run.