public void write(View view)
{
String state;
File Dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
if (!Dir.exists())
{
Dir.mkdir();
}
File file = new File(Dir,"nahk.txt");
Toast.makeText(getApplicationContext(),file.getAbsolutePath(), Toast.LENGTH_SHORT).show();
String Message = "5nahk";
try {
FileOutputStream FOS = new FileOutputStream(file);
FOS.write(Message.getBytes());
FOS.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
I have added write permission in the manifest xml file. This method is called when I press a button. The toast says that the txt file is saved in the Download folder of my Internal Storage (since I don't have an SD card in my LG G3). I open the file location (using FileManager on my LG G3) and there is no "nahk.txt" in that folder. Why can't I see the file?
I'm not familiar with native android development but I encountered something similar using cordova. After saving a file the file was not visible browsing with a usb cable but it was actually there. To see it had to restart my device.
So you could try to restart your device and check if it is still invisible (or create a method which fetches or checks the existence of the saved file to check if it is there).
edit: I learned this by googling so you should find it also
Try this
File Dir = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Your_Folder_Name";
File file = new File(Dir,"nahk.txt");
this file will save inside of your device storage Your_Folder_Name
Related
I'm using the openFileOutput() to create a new txt file. I need the file to be visible from other applications (as well as from a PC when the Android device is connected via USB. Ive tried using .setReadable(true); but this does not seem valid. Please advise how I should declare the file is visible / public.
try {
textIncoming.append("saving");
final String STORETEXT = "test.txt";
OutputStreamWriter out = new OutputStreamWriter(openFileOutput(STORETEXT, 0));
out.setReadable(true);
out.write("testing");
out.close();
}
catch (Throwable t) {
textIncoming.append("not saving");
}
Ive changed my program to use getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS), but for some reason it returns a path /storage/emulated/0/Documents, and I cant even find this folder on the device. Ive looked at the files on the android device using ES file explorer but cant find the folder or file I'm trying to create (Plus I want these in an documents folder on the SD card, so it seems that its not giving me a pointer to the SD card at all, and not creating the folder, and not creating the file. Following is my updated code, please advise
String root = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOCUMENTS).toString();
File myDir = new File(root + "/Saved_Receipts");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "DRcpt-" + n + ".xml";
textIncoming.append(root);
File file = new File(myDir, fname);
if (file.exists()) {
file.delete();
}
try {
FileOutputStream out = new FileOutputStream(file);
out.flush();
out.close();
}
catch (Exception e) {
e.printStackTrace();
}
Save it to sdcard if you want anyone to be able to read it.
This android documentation should tell you what you need to do.
https://developer.android.com/guide/topics/data/data-storage.html#filesExternal
openFileOutput() documentation says:
Open a private file
So the file that it creates won't be visible to other apps, unless you copy it to another directory that is visible. In that case, you have to save your data in what's called "external storage" which is shared with other apps. Use the code at this link.
I am writing an app to create a folder on my Nexus 5 and then write a text file inside the folder.
The above part is working just fine. I am writting using the following code:
Creating the folder:
File sdCard1 = Environment.getExternalStorageDirectory();
File dir = new File(sdCard1.getAbsolutePath() + "/SmsApp");
if (dir.isDirectory())
{
String[] children = dir.list();
for (int i = 0; i < children.length; i++)
{
new File(dir, children[i]).delete();
}
}
File sdCard = Environment.getExternalStorageDirectory();
directory = new File (sdCard.getAbsolutePath() + "/SmsApp");
directory.mkdirs();
And writing the string to text file.
public void writeToText(String texttosave)
{
File sdCard = Environment.getExternalStorageDirectory();
File logFile = new File(sdCard.getAbsolutePath() + "/SmsApp" + "/smsrawdata.file");
if (!logFile.exists())
{
try
{
logFile.createNewFile();
}
catch (IOException e)
{
e.printStackTrace();
}
}
try
{
BufferedWriter buf = new BufferedWriter(new FileWriter(logFile, true));
buf.append(texttosave);
buf.newLine();
buf.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
Text file is showing up properly on my phone but when I am trying to access the same folder on phone I can't see the folder at all.
I thought it would be the same for other app on play store that creates a folder but then everything gets created and then I can see them on Windows Explorer.
Am I doing something wrong in the code part for it not to show on my Computer but show only on my phone. I am using ES File Explorer to see files on my phone.
Please let me know if someone else is having the same problem.
Thanks!
Your pc will communicate with the media store about files. Not directly with the sdcard or external memory. If the media store does not know about your file your pc can not see it. You forgot to tell the store that you created a file. For every new file you should invoke the media scanner for that file. You are not the first one who happens this so the problem has been reported many times. You only need to add a few lines of code which you will find easily searching this site for invoking media scanner on new file. If you switch off/on your device the file will be known soon too.
I created a file by file.createNewFile() command in "data/data/com.android.bonvoyage" folder to test file creation in the internal storage of my android tablet.
I found that the file should be visible when I have root account, but I want to find a way
to see the file created without root permission.
I don't care where the file is created, just want to see and test it on actual tablet.
Can I do that?
The process was successful by
File file = new File("data/data/com.android.bonvoyage/myfile.txt");
boolean tf = false;
if (!file.exists()) {
try {
tf = file.createNewFile();
} catch (IOException ioe) {
Toast.makeText(this, ioe.toString(), 5000).show();
//ioe.printStackTrace();
} finally {
Toast.makeText(this, "File Created? " + Boolean.toString(tf), Toast.LENGTH_SHORT).show();
}
}
With root explorer or any file explorer that supports root you could browse to: data/data/com.android.bonvoyage/myfile.txt and look whether its there or not?
Write the file to the sdcard and then you can see it with the file browser without root permissions.
Use the following code (taking from the android guide) to open a file in the pictures folder for example:
public File getAlbumStorageDir(String albumName) {
// Get the directory for the user's public pictures directory.
File file = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), albumName);
if (!file.mkdirs()) {
Log.e(LOG_TAG, "Directory not created");
}
return file;
}
The full guide can be found here:
http://developer.android.com/training/basics/data-storage/files.html#WriteExternalStorage
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.
So I have seen plenty of examples of backing up a SQLite database file to the SD card and I have gotten this to work successfully on the android emulator in development, however it does not work as expected on the phone itself. Here is the strange part that I do no understand. Backing up the file does actually create the file on the SD card, however not all of the data that is present in the SQLite database used by the application is contained in the file that is backed up. Has anybody else run into this issue? Below is the code I am using to backup the file. The DB_PATH constant contains the value of /data/data/[package name]/databases/. Any help with this would be greatly appreciated.
try
{
File dbFile = new File(DataBaseHelper.DB_PATH
+ DataBaseHelper.DB_NAME);
File exportDir = new File(Environment.getExternalStorageDirectory()
+ DB_BACKUP_PATH);
if (!exportDir.exists()) {
exportDir.mkdirs();
}
File file = new File(exportDir, dbFile.getName());
file.createNewFile();
FileUtil.copyFile(dbFile, file);
return true;
} catch (IOException e) {
BusinessLogic.errorHandler(e, ManageDataActivity.this);
return false;
}
catch(Exception e) {
BusinessLogic.errorHandler(e, ManageDataActivity.this);
return false;
}
You cannot access the database file without root privileges. That explains the behavior you're seeing.
Instead of copying the file itself, I would create a new database on the SD card and then try to copy all the data from the old database.