Develop Reference

How to get all file list in my storage?

I'm making application that find specific file in my storage.
So I put all file list into List.
Root = Environment.getExternalStorageDirectory().getAbsolutePath();
List<String> fileList = new ArrayList<String>();
searchFile(new File(Root));
void searchFile(File directory){
File[] files = directory.listFiles();
try{
if(directory.exists()) {
File[] files = directory.listFiles();
for (int i = 0; i < files.length; i++) {
if(files[i].exists()) {
if (files[i].isDirectory()) {
File[] file = files[i].listFiles();
for (int j = 0; j < file.length; j++) {
searchFile(file[j].getPath());
}
} else
fileList.add(files[i].getPath());
}
}
}
} catch(Exception ex){}
}
But My the number of all file is more than 60000.
So When I tried to debug, It worked so slowly.
How can I get All file list in my storage quickly?

Please try the below code.
Root = Environment.getExternalStorageDirectory().getAbsolutePath();
List<String> fileList = new ArrayList<String>();
searchFile(new File(Root));
void searchFile(File directory){
try{
if(directory.exists()) {
File[] files = directory.listFiles();
for (File file : files) {
if(file.exists()) {
if (file.isDirectory()) {
File[] innerFiles = file.listFiles();
for (File innerFile : innerFiles) {
searchFile(innerile.getPath());
}
} else
fileList.add(file.getPath());
}
}
}
} catch(Exception ex){}
}
This will narrow down your performance issue to a certain level.

Displaying folders only containing files with certain file type

I have set up code to display all folders that are on the SD card but now I am trying to figure out how to only display folders which contain MP3 files.
How can I filter out the folders that don't contain .MP3 files? thanks.
class:
public class FragmentFolders extends ListFragment {
private File file;
private List<String> myList;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
myList = new ArrayList<String>();
String root_sd = Environment.getExternalStorageDirectory().toString();
file = new File(root_sd);
File list[] = file.listFiles();
for (int i = 0; i < list.length; i++) {
myList.add(list[i].getName());
}
setListAdapter(new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1, myList));
}
public void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
File temp_file = new File(file, myList.get(position));
if (!temp_file.isFile()) {
file = new File(file, myList.get(position));
File list[] = file.listFiles();
myList.clear();
for (int i = 0; i < list.length; i++) {
myList.add(list[i].getName());
}
Toast.makeText(getActivity(), file.toString(), Toast.LENGTH_LONG)
.show();
setListAdapter(new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1, myList));
}
return;
}
}

You can check if the files within a directory are mp3 files before adding to your list view's dataset
Modify your code as follows:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
myList = new ArrayList<String>();
String root_sd = Environment.getExternalStorageDirectory().toString();
file = new File(root_sd);
//list content of root sd
File list[] = file.listFiles();
for (int i = 0; i < list.length; i++) {
//check the contents of each folder before adding to list
File mFile = new File(file, list[i].getName());
File dirList[] = mFile.listFiles();
if(dirList == null) continue;
for (int j = 0; j < dirList.length; j++) {
if(dirList[j].getName().toLowerCase(Locale.getDefault()).endsWith(".mp3")){
myList.add(list[i].getName());
break;
}
}
}
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, myList));
}
I tested this and it works. Only caveat is, it doesn't check for sub-directories.
So in:
sdcard/Music/mistletoe.mp3
sdcard/Media/Tracks/mistletoe.mp3
only the Music folder will be listed.
Also, you may want to use an asyncTask to eschew hogging the UI thread

You can user a fileNameFilter and filter out the folders/files you don't want.
File baseDirectory = new File("/mnt/sdcard/"); //Your base dir here
File[] files = baseDirectory.listFiles(new FilenameFilter() {
#Override
public boolean accept(File dir, String fileName) {
File possibleMp3Folder = new File(dir, fileName);
if (possibleMp3Folder.isDirectory()) {
File[] files1 = possibleMp3Folder.listFiles();
for (File file : files1) {
if (file.getName().toLowerCase().endsWith(".mp3")) {
return true;
}
}
}
return false;
}
});

If you are looking for all folders contains mp3 files (both on Internal storage and SD Card) and available storages contains media:
Initialize two Sets for media storage paths and mp3 folders paths:
private HashSet<String> storageSet = new HashSet<>();
private HashSet<String> folderSet = new HashSet<>();
Get both in one method (you can return value if you need only one):
private void getMediaFolders() {
ContentResolver resolver = getContentResolver();
Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";
String[] projection = { MediaStore.Audio.Media.DATA };
Cursor cursor = resolver.query(uri, projection, selection, null, null);
if(cursor != null && cursor.getCount() > 0) {
int dataIndex = cursor.getColumnIndex(MediaStore.Audio.Media.DATA);
while(cursor.moveToNext()) {
String data = cursor.getString(dataIndex);
int i = 0;
for (int slashCount = 0; i < data.length(); i++) {
if (data.charAt(i) == '/' && ++slashCount == 3) {
storageSet.add(data.substring(0, i));
break;
}
}
if (data.toLowerCase().endsWith("mp3")) {
int lastSlashIndex = data.lastIndexOf('/');
while (i < lastSlashIndex) {
data = data.substring(0, lastSlashIndex);
folderSet.add(data);
lastSlashIndex = data.lastIndexOf('/');
}
}
}
}
if (cursor != null) { cursor.close(); }
}
Filter folders (with Annimonstream):
private ArrayList<File> getFilteredFolders(#NonNull String path, HashSet<String> folderSet) {
File[] filesList = new File(path).listFiles();
if (filesList == null) { return new ArrayList<>(); } // Or handle error as you wish
return Stream.of(filesList)
.filter(File::isDirectory)
.filter(f -> folderSet.contains(f.getAbsolutePath()))
.collect(Collectors.toCollection(ArrayList::new));
}
Show storages (if needed).

Uri,Projection,
MediaStore.Video.Media.DATA
+ " like " + "'%.mp4%'"
+ " AND "
+ MediaStore.Video.Media.DATA
+ " like " + "'%" + getResources().
getString(R.string.string_store_video_folder)
+"%'", null,
MediaStore.Video.Media.DATE_MODIFIED
this will give mp4 files in a specific folder

Android: how to list files from SD card

I want to list all the files on the SD card. I use a this code for it:
myList = new ArrayList();
String root_sd = Environment.getExternalStorageDirectory().toString();
file = new File( "storage/" + root_sd ) ;
Log.e(myLog, file.getName());
File list[] = file.listFiles();
for( int i=0; i< list.length; i++)
{
myList.add( list[i].getName() );
Log.e(myLog, list[i].getName() + " : " + list[i].getTotalSpace());
}
And I get a nullPointerException for it after I log the name. I tried an other file also:
file = new File( root_sd ) ;
Ended with the same result.
So, how can I list the files properly? Thx for help!

...//initing the variables
String fileName = Environment.getExternalStorageDirectory().toString();
title.setText(fileName);
ArrayList<String> FilesInFolder = GetFiles(fileName);
mList.setAdapter(new ArrayAdapter<String>(getActivity() , android.R.layout.simple_list_item_1 , FilesInFolder));
mList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
// Clicking on items
}
});
and the function
public ArrayList<String> GetFiles(String DirectoryPath) {
ArrayList<String> MyFiles = new ArrayList<String>();
File f = new File(DirectoryPath);
f.mkdirs();
File[] files = f.listFiles();
if (files.length == 0)
return null;
else {
for (int i=0; i<files.length; i++)
MyFiles.add(files[i].getName());
}
return MyFiles;
}
If you want a different layout make an own ArrayAdapter

ArrayList<File> contains filename

I have a problem with an ArrayList (File in the above code). This arraylist is composed by files that are located into the sd. The problem is that I can have duplicates (the same image, but in different paths into the sd, so the same filename but different path) and I want to remove them. So I use this code:
ArrayList<File> removedDuplicates = new ArrayList<File>();
for (int i = 0; i < File.size(); i++) {
if (!removedDuplicates.contains(File.get(i))) {
removedDuplicates.add(File.get(i));
}
}
But it doesn't work, I guess because contains() for a List of File looks at the filepath instead of at the filename. Is it true? How can I solve my problem? I also tried with:
ArrayList<File> removedDuplicates = new ArrayList<File>();
for (int i = 0; i < File.size(); i++) {
if (!removedDuplicates.contains(File.get(i).getName())) {
removedDuplicates.add(File.get(i));
}
}
but still it doesn't work. Thanks

The type of getName is String and the type of object in your ArrayList is File, so you're never going to get the same thing.
You want to compare the names inside the ArrayList.
for(File f : files){
String fName = f.getName();
boolean found = false;
for(File f2 : removedDuplicates){
if(f2.getName().equals(fName)){
found = true;
break;
}
}
if(!found){
removedDuplicates.add(f);
}
}

Its very simple.
PS: Tested Code
Map<String, File> removedDuplicatesMap = new HashMap<String, File>();
for (int i = 0; i < files.size(); i++) {
String filePath = files.get(i).getAbsolutePath();
String filename = filePath.substring(filePath.lastIndexOf(System
.getProperty("file.separator")));
removedDuplicatesMap.put(filename, files.get(i));
}
ArrayList<File> removedDuplicates = new ArrayList<File>(
removedDuplicatesMap.values());

Try this:
ArrayList<File> removedDuplicates = new ArrayList<File>();
File temp;
for (int i = 0; i < File.size(); i++) {
temp=new File(File.get(i).getAbsolutePath());
if (!removedDuplicates.contains(temp)) {
removedDuplicates.add(File.get(i));
}
}

Accessing Android DCIM Images

How does one obtain images from the /DCIM/100ANDRO folder?
I have tried
File rootsd = Environment.getExternalStorageDirectory();
File dcim = new File(rootsd.getAbsolutePath() + "/DCIM/100ANDRO");
File[] imagelist = dcim.listFiles(new FilenameFilter(){
public boolean accept(File dir, String name)
{
return ((name.endsWith(".jpg"))||(name.endsWith(".png")));
}
});
mFiles = new String[imagelist.length];
for(int i= 0 ; i< imagelist.length; i++)
{
mFiles[i] = imagelist[i].getAbsolutePath();
}
mUrls = new Uri[mFiles.length];
for(int i=0; i < mFiles.length; i++)
{
mUrls[i] = Uri.parse(mFiles[i]);
}
but I got a Null Pointer Exception.

Have you remembered to give the app permission to write the external memory?
It is done in the AndroidManifest.xml file, by adding
"android.permission.WRITE_EXTERNAL_STORAGE"
Since you are making a new file object, this is needed, I would guess.