///edited
I try to run the program on the main thread and it can read and save.
I think is problem of the asynctask!!
///
First I already add the user permission to the android manifest
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
I try to read a raw image data from mnt/sdcard/Bluetooth and process it and then write to the internal sdcard and the write path is mnt/sdcard/Bluetooth.
The program can run in my android emulator and save File.
However,when run it real phone, it seems that the phone can only read my file,but not save file.
public class MainActivity extends Activity {
String filenameIn ="ardrone.raw";
File file = new File(Environment.getExternalStorageDirectory()+"/Bluetooth/", filenameIn);
String filename ="convertA.jpg";
File outputfile = new File(Environment.getExternalStorageDirectory() +"/Bluetooth/",filename);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myImageView = (ImageView)findViewById(R.id.imageView);
Toast.makeText(this, "search raw file", Toast.LENGTH_LONG).show();
new imageProcess().execute();
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,Uri.parse("file://" + Environment.getExternalStorageDirectory())));
Bitmap myBitmap = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory()
.getAbsolutePath()+"/Bluetooth/convertA.jpg");
myImageView.setImageBitmap(myBitmap);
if (file.exists()){
Toast.makeText(this, "InFile:)", Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(this, "InFile:(((((", Toast.LENGTH_LONG).show();
}
if (outputfile.exists()){
Toast.makeText(this, "outputfile:)", Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(this, "outputfile:(((((", Toast.LENGTH_LONG).show();
}
}
public class imageProcess extends AsyncTask<String, Integer, Boolean>{
Boolean check_point= false;
#Override
protected Boolean doInBackground(String... arg0) {
try {
receiveVideoRawData();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}
public void receiveVideoRawData() throws IOException{
byte[] buf_rcv = new byte[153600];
ByteArrayOutputStream ous = new ByteArrayOutputStream();
InputStream ios = new FileInputStream(file);
int read = 0;
while ( (read = ios.read(buf_rcv)) != -1 ) {
ous.write(buf_rcv, 0, read);
}
ous.close();
ios.close();
ReadRawFileImage readMyRawData=new ReadRawFileImage();
image = readMyRawData.readUINT_RGBImage(buf_rcv);
//transfer data
OutputStream _outStream = new FileOutputStream(outputfile);
Bitmap pBitmap = image ;
pBitmap.compress(Bitmap.CompressFormat.JPEG, 90, _outStream);
_outStream.flush();
_outStream.close();
}
}
The first thing is to check if your path exists; on different phones the sd card may be mounted at different locations. On my Linux,
$ ~/android-sdk-linux/platform-tools/adb shell ls -l /mnt/sdcard/
The 2nd thing is to check permissions on the file and the containing directory.
Then, you might examine the logs (they may already contain an error message); then, add debug output to your code and examine the logs with that debug output.
try making your new file writable using file.writable(true). It could also be that your new file doesnt really exist.
Apparently you only need to set the external read permission if you don't have the write permission, this might be overwriting your write privileges?
http://developer.android.com/reference/android/Manifest.permission.html#READ_EXTERNAL_STORAGE
First you should confirm that the real device has SDCARD storage(Some device have not "SDCARD" storage).
Please see below reference to get all storage list
How to list additional external storage folders (mount points)?
Related
I'm trying to copy file from within my application to the SD card, but I get the error eacces (permission denied). The OS is Android M and I have allowed runtime Storage permissions (checked in app info). I have also set the uses-permission in AndroidManifest.xml
<application>...</application>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Doesn't work if I copy to SD card
Source: data/user/0/com.example.myapp/cache/SomeFile.txt
Destination: /storage/1032-2568/SomeFolder/
Error: java.io.FileNotFoundException: /storage/1032-2568/SomeFolder/SomeFile.txt: open failed: EACCES (Permission denied)
Works if I copy to internal storage
Source: data/user/0/com.example.myapp/cache/SomeFile.txt
Destination: /storage/emulated/0/SomeFolder/
Code to copy file from source to destination
/*
* Below are the parameters I have tried
*
* inputPath - data/user/0/com.example.myapp/cache or data/user/0/com.example.myapp/cache/
* inputFile - /SomeFile.txt or SomeFile.txt
* outputPath - /storage/1032-2568/SomeFolder/ or /storage/1032-2568/SomeFolder
*/
public static void copyFile(String inputPath, String inputFile, String outputPath) {
InputStream in = null;
OutputStream out = null;
try {
//create output directory if it doesn't exist
File dir = new File (outputPath);
if (!dir.exists()) {
dir.mkdirs();
}
in = new FileInputStream(inputPath + inputFile);
out = new FileOutputStream(outputPath + inputFile);
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1) {
out.write(buffer, 0, read);
}
in.close();
// write the output file (You have now copied the file)
out.flush();
out.close();
}
catch (FileNotFoundException fnfe1) {
/* I get the error here */
Log.e("tag", fnfe1.getMessage());
}
catch (Exception e) {
Log.e("tag", e.getMessage());
}
}
ES File Explorer
I saw that ES File Explorer also cannot write anything on the SD Card on Redmi devices. Here's a video with solution. Following the steps worked for ES Explorer on my device. Can this be done programmatically?
As suggested by #CommonsWare here we have to use the new Storage Access Framework provided by android and will have to take permission from user to write SD card file as you said this is already written in the File Manager Application ES File Explorer.
Here is the code for Letting the user choose the "SD card" :
startActivityForResult(new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE), requestCode);
which will look somewhat like this :
And get the Document path in pickedDirand pass further in your copyFile block
and use this path for writing the file :
public void onActivityResult(int requestCode, int resultCode, Intent resultData) {
if (resultCode != RESULT_OK)
return;
else {
Uri treeUri = resultData.getData();
DocumentFile pickedDir = DocumentFile.fromTreeUri(this, treeUri);
grantUriPermission(getPackageName(), treeUri, Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
getContentResolver().takePersistableUriPermission(treeUri, Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
copyFile(sdCard.toString(), "/File.txt", path + "/new", pickedDir);
}
}
public void copyFile(String inputPath, String inputFile, String outputPath, DocumentFile pickedDir) {
InputStream in = null;
OutputStream out = null;
try {
//create output directory if it doesn't exist
File dir = new File(outputPath);
if (!dir.exists()) {
dir.mkdirs();
}
in = new FileInputStream(inputPath + inputFile);
//out = new FileOutputStream(outputPath + inputFile);
DocumentFile file = pickedDir.createFile("//MIME type", outputPath);
out = getContentResolver().openOutputStream(file.getUri());
byte[] buffer = new byte[1024];
int read;
while ((read = in.read(buffer)) != -1) {
out.write(buffer, 0, read);
}
in.close();
// write the output file (You have now copied the file)
out.flush();
out.close();
} catch (FileNotFoundException fnfe1) {
/* I get the error here */
Log.e("tag", fnfe1.getMessage());
} catch (Exception e) {
Log.e("tag", e.getMessage());
}
}
You need to add permission request run time in Android 6.0 (API Level 23) and up, here is the official docs
This is the code for WRITE_EXTERNAL_STORAGE
if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
Log.d(TAG,"Permission is granted");
return true;
}
Ask for permission else like this
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CODE);
I have also got that problem but i solved by use the request the permission in run time and after forcefully give the permission.After the permission in App info of Android device. after declare the permission in manifest =>go to setting of your device => go to app info => go to permission =>
and finally allow the permission . just remember i just talking about after api level 22 means from marshmallow.
Its seems the runtime permission are implemented correctly but the issues seems from the device
If you are using Redmi than you have to manually allow the permission of specific app in Redmi security settings
This link shows how to enable permission in redmi security
After Android 4.3 on some devices, you can't get direct write access to FileSystem on SDcard.
You should use storage access framework for that.
I can see that you are copying the entire content of one file and trying to write the same to another file. I could suggest a better way to do this :
Assuming that you already checked for file existence
StringWriter temp=new StringWriter();
try{
FileInputStream fis=new FileInputStream(inputFile+inputPath);
int i;
while((i=fis.read())!=-1)
{
temp.write((char)i);
}
fis.close();
FileOutputStream fos = new FileOutputStream(outputPath, false); // true or false based on opening mode as appending or writing
fos.write(temp.toString(rs1).getBytes());
fos.close();
}
catch (Exception e){}
This code worked for my app...Let me know if this is working for you or not..
You can't copy or Delete files & Folder on external storage using third party app. like [file explorer].
It's data policy updated after KITKAT Version.
If only allow on system apps. So you can use an original file explorer (Come from ROM).
IF you need to use 3rd party app then ROOT your device. (Root permission is required)
I am trying to store my output file in internal memory.but it throws java.io.FileNotFoundException Access is denied
private boolean crop() {
try {
FileOutputStream fos = null;
String filePath = CustomVideoGalleryActivity.videoPath.get(0);
Movie originalMovie = MovieCreator.build(filePath);
Track track = originalMovie.getTracks().get(0);
Movie movie = new Movie();
movie.addTrack(new AppendTrack(new CroppedTrack(track, 200, 800)));
Container out = new DefaultMp4Builder().build(movie);
String outputFilePath = Environment.getDataDirectory()+ "/output_crop.mp4";
fos = new FileOutputStream(new File(outputFilePath)); //throws Exception
out.writeContainer(fos.getChannel());
fos.close();
mProgressDialog.dismiss();
finish();
} catch (Exception e) {
Log.v("ONMESSAGE", e.toString());
e.printStackTrace();
mProgressDialog.dismiss();
return false;
}
return true;
}
You need to ask for write permission in your AndroidManifest.xml. In particular, the following line must be present:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
You shouldn't be looking at the Data Directory. This is a system directory in the phone's storage - usually /data - and your application will never have permission to write to it.
The directory your application should write files to is returned by the Context.getFilesDir() method. It will be something like /data/data/com.yourdomain.YourApp/files.
If you want to write to a file in the phone's storage use the Context.openFileOutput() method.
If you want the path to the SDCard then use Environment.getExternalStorageDirectory() method. To write to the SDCard you'll need to give your application the appropriate permissions by adding the following to your Manifest:
If you're going to write to the SDCard you'll also need to check its state with the getExternalStorageState() method.
If you're storing small files to do with your application then these can go into the phone's storage and not the SD Card, so use the Context.openFileOutput() and Context.openFileInput() methods.
So in your code consider something like:
OutputStream os = openFileOutput("samplefile.txt", MODE_PRIVATE);
BufferedWriter lout = new BufferedWriter(new OutputStreamWriter(os));
I've been using the way the system saves screenshots to save my bitmaps to the disk and gallery. This works in Android 4.2 and before but not in Android 4.3.
Relevant code :
Uri imageUri = resolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
OutputStream out = resolver.openOutputStream(uri);
Full code here.
In 4.3 (new Nexus 7) however, I get a FileNotFoundException on the second line. I couldn't see any changes in 4.3 relevant to this on the website.
So what is the right way to save an image to the disk and gallery?
Verified :
storage is mounted with this method
imageUri is not null (usually something like "content://media/external/images/media/2034")
manifest has permission android.permission.WRITE_EXTERNAL_STORAGE
This is the way I save bitmaps to the Gallery:
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
Uri contentUri; //instantiate Uri with location of image
mediaScanIntent.setData(contentUri);
context.sendBroadcast(mediaScanIntent);
In your manifest file try with change target sdk to 18.-
<uses-sdk android:minSdkVersion="7"
android:targetSdkVersion="18"/>
It might solve your prob(May not). In 4.3 JELLY_BEAN_MR2, android did couple of changes and android clearly written that Your app might misbehave in a restricted profile environment. so please look at http://developer.android.com/about/versions/android-4.3.html
I have these permission in my Manifest.
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
But I am using a Target SDK version 15. Is there a requirement that you have to use a target SDK 18?
BTW:
Here is a sample code for downloading profile pictures from Facebook:
private class DownloadProfilePicTask extends AsyncTask<Void,String,String> {
Bitmap profilePic;
String fileName;
String id;
String type;
URL img_value;
public DownloadProfilePicTask(String i,String ty)
{
id = i;
if(id==null)
{
//Log.v("Id is null", "Error");
}
//Log.v("Download Profile Pic Task initialized for id:",id);
type = ty;
}
#Override
protected String doInBackground(Void...param) {
String root = Environment.getExternalStorageDirectory().toString();
if(root==null)
{
return null;
}
try{
profilePic = BitmapFactory.decodeStream(img_value.openConnection().getInputStream());
}
catch (IOException e) {
e.printStackTrace();
}
if(profilePic == null)
{
//Log.v("profilePic is null", "Error");
}
//Log.v("Root for saving images",root );
File myDir = new File(root + "/saved_images");
myDir.mkdirs();
fileName = root + "/saved_images/" + id + ".png";
//Log.v("filename is ",fileName);
File file = new File (fileName);
fileName = file.getPath();
if (file.exists ()) file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
profilePic.compress(Bitmap.CompressFormat.PNG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
return id;
}
#Override
protected void onPreExecute()
{
try
{
img_value = new URL("http://graph.facebook.com/"+id+"/picture?type=" + type);
}
catch (MalformedURLException e) {
e.printStackTrace();
}
}
#Override
protected void onPostExecute(String result) {
}
}
and then I just call:
new DownloadProfilePicTask(id,type).execute();
to download and automatically save images.
Note: You will have to play with filePath a bit for exact location.
There some changes in the fileSystem on Android 4.3 to start to avoid dev. to directly write in "/sdcard" or "/mnt/sdcard" but use the android ExternalStorage system. (http://source.android.com/devices/tech/storage/index.html)
N.B. : ExternalStorage can be an internal memory :p
For your case, have you tryed to use a method based on getExternalStorage ?
(like this : Find an external SD card location)
I have a problem with creating a folder and a file on the sdcard.
Here's the code:
File folder = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString() + "/folder");
boolean success;
if (!folder.exists()) {
success = folder.mkdirs();
}
File obdt = new File(folder, "file.txt");
try {
success = obdt.createNewFile();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
With this code I expect to create the folderfolder in the Download folder of the sdcard and in this the file file. I want that the user can access the file. So I want to put it in a shared folder.
The success variable is true and when I run the code again the folder already exists and doesnt come in the if-block.
But I can't see the created folder and file on the sdcard in file explorer.
Info:getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).toString() returns storage/sdcard/Download
I work with a Galaxy Nexus.
Damn! :)
Now I solved my problem...I was misunderstanding the operation of creating files in the file system.
When I spoke of file explorer I meant the file explorer of the operating system and NOT the file explorer in the DDMS :).
I thought when I create a file I will see it in the file explorer of the operating system but when the device is connected to the PC the files can only be seen in the DDMS file explorer.
Sorry I'm new to Android ;)
When the App is running standalone without PC connection and afterwards I connect with the PC I see the created files and folders of course :)
Thanks for help
Any errors from logcat?
Else: try something like Log.I("PATHNAME",folder.absolutePath()); and then look in your logcat to make sure where you are creating the folder where you think it is.
If you haven't done so already, you will need to give your app the correct permission to write to the SD Card by adding the line below to your Manifest:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
If you have already done that see if :
File obdt = new File(/sdcard/folder/file.txt)
try {
success = obdt.createNewFile();
} catch (IOException e1) {
e1.printStackTrace();
}
works.
You cannot see the folder/file in explorer? Maybe it is because the MediaScanner is active, but not adding your files. You can do this in your program or switch the Media Scanner of somewhere in your phone settings.
MediaScanner
Trigger MediaScanner
Try this out.
File dir = new File(Environment.getExternalStorageDirectory()
+ "/XXX/Wallpapers/");
File[] files = dir.listFiles();
if (files == null)
{
int numberOfImages = 0;
BitmapDrawable drawable = (BitmapDrawable) imageView
.getDrawable();
Bitmap bitmap = drawable.getBitmap();
File sdCardDirectory = Environment
.getExternalStorageDirectory();
new File(sdCardDirectory + "/XXX/Wallpapers/").mkdirs();
File image = new File(sdCardDirectory
+ "/XXX/Wallpapers/Sample" + numberOfImages + ".JPG");
boolean success = false;
FileOutputStream outStream;
try {
outStream = new FileOutputStream(image);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
outStream.flush();
outStream.close();
success = true;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
if (success) {
Toast.makeText(
getApplicationContext(),
"Image saved successfully in Sdcard/XXX/Wallpapers",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(),
"Error during image saving", Toast.LENGTH_LONG)
.show();
}
Dont forget to add permission in manifest
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Apparently there is a known bug in MTP.
Issue 195362
All phones using MTP instead of USB Mass storage do not properly show the list of files when that phone is connected to a computer using a USB cable. Android apps running on the device also cannot see these files.
It is actually as old as 2012
I've encountered the same problem: created files and folders don't show immediately after being written to sdcard, despite the file being flushed and closed !!
They don't show on your computer over USB or a file explorer on the phone.
I observed three things:
if the absolute path of the file starts with /storage/emulated/0/ it doesn't mean it'll be on your sdcard - it could be on your main storage instead.
if you wait around 5 minutes, the files do begin to show over USB (i.e. Windows explorer and built-in file explorer)
if you use adb shell ls /sdcard from terminal, then the file does show! you could use adb pull ... to get the file immediately. You could probably use DDMS too.
Code I used was:
Gson gson = new GsonBuilder().setPrettyPrinting().create();
String json = gson.toJson(myArrayList);
try {
File externalDir = getExternalStorageDirectory();
File newFile = new File(externalDir, "myfile.txt");
FileOutputStream os = new FileOutputStream(newFile);
os.write(json.getBytes());
os.flush();
os.close();
Timber.i("saved file to %s",newFile.getAbsoluteFile().toString());
}catch (Exception ex)
{
Toast.makeText(getApplicationContext(), "Save to private external storage failed. Error message is " + ex.getMessage(), Toast.LENGTH_LONG).show();
}
and
Gson gson = new GsonBuilder().setPrettyPrinting().create();
String json = gson.toJson(myArrayList);
try {
File externalDir = getExternalStorageDirectory();
File newFile = new File(externalDir, "myfile.txt");
FileWriter fw = new FileWriter(newFile);
fw.write(json);
fw.flush();
fw.close();
Timber.i("saved file to %s",newFile.getAbsoluteFile().toString());
}catch (Exception ex)
{
Toast.makeText(getApplicationContext(), "Save to private external storage failed. Error message is " + ex.getMessage(), Toast.LENGTH_LONG).show();
}
why is it like this? Seems like another one of those "Android-isms" that you have to suffer through the first time you experience it.
i have a problem with my code that is supposed to write some data string to my sdcard. i use a class to do this:
public class CVS {
private String path;
private String filename;
private File dir;
private File file;
private FileWriter fw;
public CVS() {
path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/traffic/";
filename = "data.cvs";
file = new File(path, filename);
createDir();
}
private void createDir() {
dir = new File(path);
if(!dir.exists()) {
if(file.mkdirs() == false) {
Log.d(Config.LOGTAG, "UHOH!!!!!!!!!!!!!!!!!!!!!!!!");
}
}
else Log.d(Config.LOGTAG, "dir exists");
}
public void writeToFile(String data) {
try {
fw = new FileWriter(file);
fw.append(data); Log.d(Config.LOGTAG, "data saved to file...");
}
catch(Exception e) {
Log.d(Config.LOGTAG, "file: " + e.getMessage());
}
}
}
this results ALWAYS in an exeption being caught in writeToFile(), saying "permission denied". actually, i set permissions to WRITE_EXTERNAL_STORAGE in the manifest. so - what am i doing wrong!?
additional info: real device with sd card mounted. no emulator. android 2.2. if i create the dir myself, the problem wont go away :(
Either:
Your manifest is wrong, or
Your external storage is mounted on your development machine, or
Your manual concatenation of your directory is wrong
Your code is ok but still you can add a check for whether sdcard is inserted or not, if you run this code and sdcard is not inserted then it will throw an exception, good practice is that you should always catch the exeptions.
you can check sdcard by following code...
if (android.os.Environment.getExternalStorageState().equals
(android.os.Environment.MEDIA_MOUNTED))
{
//code or logic if sd card is inserted....
}
else
{
Log.e("Exception","SD Card not found!");
}
All of the answers are needed, but if it's a Samsung device, then you need to append "/external_sd/" to the path - because they decided they needed to dork with our minds and break the API:
"http://developer.samsung.com/forum/board/thread/view.do?boardName=GeneralB&messageId=162934&messageNumber=1381&startId=zzzzz~&searchType=TITLE&searchText=sdcard