I have a variable that just states outright:
File file = new File("/Extsdcard")
Am I foolish enough to think all android devices mount an external devices in this wording?
or should I be using Environment.getExternalStorageDirectory().getAbsolutePath();
My application searches through the first three folder layers so this is quite important to the functionality.
String path = Environment.getExternalStorageDirectory().toString()+"/YourDirectory";
Log.d("Files", "enter code herePath: " + path);
File directory = new File(path);
File[] files = directory.listFiles();
//It gives you list of all directoris/files list
Log.d("Files", "Size: "+ files.length);
for (int i = 0; i < 3; i++)
{
Log.d("Files", "FileName:" + files[i].getName());
}
Environment.getExternalStorageDirectory() gets the top level of the external drive.
Related
So in my react-native module I Want to find the already created files that my app has created in
/storage/emulated/0/Download/xx/xx
It work great when My app create those files in those directory and File.listFiles("/storage/emulated/0/Download/xx/xx") return all those files without any problem.
Now when I uninstall my app and install it again, listFiles cant find those old files anymore!!
But only find the files that I create a new.
Now for those of you who think this is about permission I already check it and have full access
status{"android.permission.WRITE_EXTERNAL_STORAGE":"granted","android.permission.READ_EXTERNAL_STORAGE":"granted"}
Here is the Java method that I have
#ReactMethod(isBlockingSynchronousMethod = true)
public String getAllAppDownloadedFiles(String folderPath) {
File folder = new File(folderPath);
String result = "";
if (!folder.exists())
return result;
File[] files = folder.listFiles();
for (int i = 0; i < files.length; i++) {
File file = files[i];
if (file.isFile())
result += file.getAbsolutePath() + (files.length - 1 > i ? "," : "");
}
return result;
}
I should point out that the problem only exist when I run the app on my mobile and not in emulator. I suspect it has to do with the version of API.
Any Idea how I could fix this?
I have a folder in root with some files I want to list but the array returns null:
String path = getenv("EXTERNAL_STORAGE") + "/Files";
File directory = new File(path);
File[] files = directory.listFiles();
Permissions are granted
First off, you need to use Environment.getExternalStorageDirectory() instead of getenv():
String path = Environment.getExternalStorageDirectory().toString() + "/Files";
File directory = new File(path);
File[] files = directory.listFiles();
for (int i = 0; i < files.length; i++)
Log.d("Files", "FileName:" + files[i].getName());
But a very important note is the /storage/emulated/0 folder does not really exist. It's what might be called a "symbolic link", or, in simpler terms, a reference to where the real data is stored. That's why your array returns null. You'll need to find the actual physical location on your device where it is stored.
I'm trying to save pictures on my Android phone and then restore them when it's needed.
So I use RxJava to save and read this files to Environment.DITECTORY_PICTURES folder. My problem is that I can write an image (my rx method calls onNext, but not onError, debug shows the correct path, settings testify that app data size grows), but can't read from there.
When I use my reading code with the correct path its throws FileNotFoundException. When I use this test code
try {
String path = Environment.DIRECTORY_PICTURES;
Log.d("Files", "Path: " + path);
File directory = new File(path);
File[] files = directory.listFiles();
Log.d("Files", "Size: "+ files.length);
for (int i = 0; i < files.length; i++)
{
Log.d("Files", "FileName:" + files[i].getName());
}
} catch (Exception e) {
e.printStackTrace();
}
it throws NPE saying that files array is null.
I have Read/Write external storage permissions granted. Tested on Android 5 and 6, so I guess there is nothing about Runtime permissions as well.
Is there something special about reading from Environment folders I don't know?
Thanks in advance for your help!
Environment.DIRECTORY_PICTURES is not a fulll qualified path to the file system directory, the one you looking for is get trough the class and using this as argument.
File directory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
Theres more kind of storages described at:
https://developer.android.com/reference/android/os/Environment.html
in my program I need something like file manager to list the files and directories of internal and external memories . for example see the picture below...
Example of what I want
how can I get the root directory
in fact I want to get a list like picture above that include internal and external directory .
thanks
Getting the list of files and folders exist in root directory, like this:
String path = Environment.getExternalStorageDirectory().toString()+"/Pictures";
Log.d("Files", "Path: " + path);
File directory = new File(path);
File[] files = directory.listFiles();
Log.d("Files", "Size: "+ files.length);
for (int i = 0; i < files.length; i++)
{
Log.d("Files", "FileName:" + files[i].getName());
}
I tried this one : How to access all mp3 files from all the subfolders in the sdcard?
I need to list all .amr files from a folder (ABC) and on click of any list item, do something.
Thanks in advance.
You can try this:
String path = Environment.getExternalStorageDirectory().toString()+"/Pictures";
Log.d("Files", "Path: " + path);
File f = new File(path);
File file[] = f.listFiles();
Log.d("Files", "Size: "+ file.length);
for (int i=0; i < file.length; i++)
{
//here populate your listview
Log.d("Files", "FileName:" + file[i].getName());
}
This will list all the files in the pictures folder. Use the path to your folder to get the files in that folder
Dont forget to use the following permission
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />