Develop Reference

How to get images from hidden folder in android

I am able to fetch all the images from any specified non hidden folder from device but how can I get all the images from a hidden specified folder.
As soon as I mention my hidden folder name in the query, cursor return null
public static List<MediaData> getAppScannedImages(Context context) {
Cursor imagecursor = null;
List<MediaData> gallerydata = new ArrayList<MediaData>();
try {
final String orderBy = Images.ImageColumns.DATE_TAKEN + " DESC";
imagecursor = context.getContentResolver()
.query(Images.Media.EXTERNAL_CONTENT_URI,
projectionImage,
Images.Media.BUCKET_DISPLAY_NAME + "='"
+ ".myHiddenFolder" + "'", null,
orderBy);
if (imagecursor != null) {
imagecursor.moveToFirst();
int count = imagecursor.getCount();
for (int i = 0; i < count; i++) {
MediaData galData = new MediaData();
galData.setKey_id(i);
galData.setId(imagecursor.getString(0));
galData.setName(imagecursor.getString(1));
galData.setPath(imagecursor.getString(2));
galData.setDate(imagecursor.getString(3));
gallerydata.add(galData);
imagecursor.moveToNext();
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (imagecursor != null) {
imagecursor.close();
}
}
return gallerydata;
}

You can try a different approach.
You have to find out the list of hidden folder from sd card and search all those folders for images.
the follwoing code is displays hidden files:
public void goTODir(File dir) {
//dir is initail dir like="/mnt/sdcard"
String imageType = ".jpg";
File[] listFile = dir.listFiles();
if (listFile != null) {
for (int i = 0; i < listFile.length; i++) {
if (listFile[i].isDirectory()) {
goTODir(listFile[i]);
} else {
if (listFile[i].isHidden()){
if(listFile[i].getName().endsWith(imageType))
{
//add to your array list
}
}
}
}
}
}

String path = Environment.getExternalStorageDirectory().toString();
File dir = new File(path);
File listFile[] = dir.listFiles();
for (int i = 0; i < listFile.length; i++) {
if(listFile[i].getAbsolutePath().contains("your hidden folder name")){
File dirtest = new File(listFile[i].getAbsolutePath());
File listFiletest[] = dirtest.listFiles();
for (int j = 0; j < listFiletest.length; j++) {
get all images from hidden folder
}
}
}

For Kotlin Lover
companion object {
const val FOLDER_PATH = "/YourFolder/.hideen/"
}
/**
* Method to get all Image Path
* #return [ArrayList]
* */
fun getImagePath(): ArrayList<String> {
// image path list
val list: ArrayList<String> = ArrayList()
// fetching file path from storage
val file = File(Environment.getExternalStorageDirectory().toString() + FOLDER_PATH)
val listFile = file.listFiles()
if (listFile != null && listFile.isNullOrEmpty()) {
Arrays.sort(listFile, LastModifiedFileComparator.LASTMODIFIED_REVERSE)
}
if (listFile != null) {
for (imgFile in listFile) {
if (
imgFile.name.endsWith(".jpg")
|| imgFile.name.endsWith(".jpeg")
|| imgFile.name.endsWith(".png")
) {
val model : String = imgFile.absolutePath
list.add(model)
}
}
}
// return imgPath List
return list
}

How to check files size

I have a problem getting the size of a file.
I have the following code:
File file = new File(path);
FilenameFilter mediafilefilter = new FilenameFilter(){
private String[] filter = {".txt"};
#Override
public boolean accept(File dir, String filename) {
for(int i= 0;i< filter.length ; i++){
if(filename.indexOf(filter[i]) != -1)return true;
}
return false;
}
};
File[] flies = file.listFiles(mediafilefilter);
if (files != null) {
{
if (files.length > 0)
{
System.out.println("Totol is :" + files.length);
for (int j = 0; j < files.length; j++) //not work
}
}
}
some text file is 0 byte

Like that
list[0].length()/1024
list[0] is the first file in your array

public long getFileSizes(File f) throws Exception{
long s=0;
if (f.exists()) {
FileInputStream fis = null;
fis = new FileInputStream(f);
s= fis.available();
}
return s;
}

How to rename file in android? [duplicate]

This question already has answers here:
Java - removing first character of a string
(14 answers)
Closed 6 years ago.
I can apply a prefix dot (".") to all the files having .gif extension successfully. For instance, rename "my_file.gif" to ".my_file.gif"). However, I want to remove this prefix dot again using code (AKA reverse it). I have tried, but it won't work. (simply does not remove the dot) below is my code and my approach -
this is the code for adding a dot prefix(which works fine)-
// getting SDcard root path
File dir = new File(Environment.getExternalStorageDirectory()
.getAbsolutePath());
walkdir(dir);
}
//detect files having these extensions and rename them
public static final String[] TARGET_EXTENSIONS = { "gif"};
public void walkdir(File dir) {
File listFile[] = dir.listFiles();
if (listFile != null) {
for (int i = 0; i < listFile.length; i++) {
if (listFile[i].isDirectory()) {
walkdir(listFile[i]);
} else {
String fPath = listFile[i].getPath();
for (String ext : TARGET_EXTENSIONS) {
if (fPath.endsWith(ext)) {
putDotBeforeFileName(listFile[i]);
}
}
}
}
}
}
private String putDotBeforeFileName(File file) {
String fileName = file.getName();
String fullPath = file.getAbsolutePath();
int indexOfFileNameStart = fullPath.lastIndexOf(fileName);
StringBuilder sb = new StringBuilder(fullPath);
sb.insert(indexOfFileNameStart, ".");
String myRequiredFileName = sb.toString();
file.renameTo(new File(myRequiredFileName));
return myRequiredFileName;
}
}
and this is my approach for removing the dot prefix which doesn't work (no force closes)-
private String putDotBeforeFileName(File file) {
String fileName = file.getName();
String fullPath = file.getAbsolutePath();
int indexOfDot = fullPath.indexOf(".");
String myRequiredFileName = "";
if (indexOfDot == 0 && fileName.length() > 1) {
myRequiredFileName = file.getParent() + "/" + fileName.substring(1);
}
try {
Runtime.getRuntime().exec(
"mv " + file.getAbsolutePath() + " " + myRequiredFileName);
} catch (IOException e) {
e.printStackTrace();
}
return myRequiredFileName;
}

Try this code
private String removeDotBeforeFileName(File file) {
String fileName = file.getName();
String fullPath = file.getAbsolutePath();
String myRequiredFileName = "";
if (fileName.length() > 1 && fullPath.charAt(0)=='.') {
myRequiredFileName = file.getParent() + "/" + fileName.substring(1);
file.renameTo(new File(myRequiredFileName));
}
return myRequiredFileName;
}

Get path to the External SdCard in android

I want to get External SdCard path on devices if it available. by using Environment.getExternalStorageDirectory().getAbsolutePath() I can get the path to the Internal Storage. So I used below class for detecting External storage.
public class ExternalStorage {
public static final String SD_CARD = "sdCard";
public static final String EXTERNAL_SD_CARD = "externalSdCard";
/**
* #return True if the external storage is available. False otherwise.
*/
public static boolean isAvailable() {
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
return true;
}
return false;
}
public static String getSdCardPath() {
return Environment.getExternalStorageDirectory().getPath() + "/";
}
/**
* #return True if the external storage is writable. False otherwise.
*/
public static boolean isWritable() {
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
return true;
}
return false;
}
/**
* #return A map of all storage locations available
*/
public static Map<String, File> getAllStorageLocations() {
Map<String, File> map = new HashMap<String, File>(10);
List<String> mMounts = new ArrayList<String>(10);
List<String> mVold = new ArrayList<String>(10);
mMounts.add("/mnt/sdcard");
mVold.add("/mnt/sdcard");
try {
File mountFile = new File("/proc/mounts");
if(mountFile.exists()){
Scanner scanner = new Scanner(mountFile);
while (scanner.hasNext()) {
String line = scanner.nextLine();
if (line.startsWith("/dev/block/vold/")) {
String[] lineElements = line.split(" ");
String element = lineElements[1];
// don't add the default mount path
// it's already in the list.
if (!element.equals("/mnt/sdcard"))
mMounts.add(element);
}
}
}
}
catch (Exception e) {
e.printStackTrace();
}
try {
File voldFile = new File("/system/etc/vold.fstab");
if(voldFile.exists()){
Scanner scanner = new Scanner(voldFile);
while (scanner.hasNext()) {
String line = scanner.nextLine();
if (line.startsWith("dev_mount")) {
String[] lineElements = line.split(" ");
String element = lineElements[2];
if (element.contains(":"))
element = element.substring(0, element.indexOf(":"));
if (!element.equals("/mnt/sdcard"))
mVold.add(element);
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
for (int i = 0; i < mMounts.size(); i++) {
String mount = mMounts.get(i);
if (!mVold.contains(mount))
mMounts.remove(i--);
}
mVold.clear();
List<String> mountHash = new ArrayList<String>(10);
for(String mount : mMounts){
File root = new File(mount);
if (root.exists() && root.isDirectory() && root.canWrite()) {
File[] list = root.listFiles();
String hash = "[";
if(list!=null){
for(File f : list){
hash += f.getName().hashCode()+":"+f.length()+", ";
}
}
hash += "]";
if(!mountHash.contains(hash)){
String key = SD_CARD + "_" + map.size();
if (map.size() == 0) {
key = SD_CARD;
} else if (map.size() == 1) {
key = EXTERNAL_SD_CARD;
}
mountHash.add(hash);
map.put(key, root);
}
}
}
mMounts.clear();
if(map.isEmpty()){
map.put(SD_CARD, Environment.getExternalStorageDirectory());
}
return map;
}
Example usage
Map <String, File> externalLocations = ExternalStorage.getAllStorageLocations();
File sdCard = externalLocations.get(ExternalStorage.SD_CARD);
File externalSdCard=externalLocations.get(ExternalStorage.EXTERNAL_SD_CARD);
on some device like Samsung Galaxy S3 it detects External SdCard correctly and return /storage/extSdCard for path to the External SdCard but on other devices like Sony Experia Z1 and Z2 it can't detect External Sdcard and give me the path to the Internal Storage. How can I solve this problem?

Use below code in order to get sd card path
public class DiskHelper
{
public static final int MODE_INTERNAL = 0;
public static final int MODE_EXTERNAL = 1;
public static final int MODE_EXTERNAL_SD = 2;
private StatFs statFs;
protected String path;
public DiskHelper(int mode)
{
try
{
if(mode == 0)
{
path = Environment.getRootDirectory().getAbsolutePath();
statFs = new StatFs(path);
statFs.restat(path);
}
else if(mode == 1)
{
path = Environment.getExternalStorageDirectory().getAbsolutePath();
statFs = new StatFs(path);
statFs.restat(path);
}
else
{
for(String str : getExternalMounts())
{
path = str;
statFs = new StatFs(str);
statFs.restat(str);
break;
}
}
}
catch(Exception e)
{
KLog.error(e);
}
}
public String getPath()
{
return path;
}
public long getTotalMemory()
{
if(statFs == null)
{
return 0;
}
long total = ((long)statFs.getBlockCount() * (long)statFs.getBlockSize());
return total;
}
public long getFreeMemory()
{
if(statFs == null)
{
return 0;
}
long free = ((long)statFs.getAvailableBlocks() * (long)statFs.getBlockSize());
return free;
}
public long getBusyMemory()
{
if(statFs == null)
{
return 0;
}
long total = getTotalMemory();
long free = getFreeMemory();
long busy = total - free;
return busy;
}
public static HashSet<String> getExternalMounts()
{
final HashSet<String> out = new HashSet<String>();
String reg = "(?i).*vold.*(vfat|ntfs|exfat|fat32|ext3|ext4).*rw.*";
String s = "";
try
{
final Process process = new ProcessBuilder().command("mount").redirectErrorStream(true).start();
process.waitFor();
final InputStream is = process.getInputStream();
final byte[] buffer = new byte[1024];
while(is.read(buffer) != -1)
{
s = s + new String(buffer);
}
is.close();
}
catch(Exception e)
{
KLog.error(e);
}
final String[] lines = s.split("\n");
for (String line : lines)
{
if(!line.toLowerCase(Locale.US).contains("asec"))
{
if(line.matches(reg))
{
String[] parts = line.split(" ");
for(String part : parts)
{
if(part.startsWith("/"))
{
if(!part.toLowerCase(Locale.US).contains("vold"))
{
out.add(part);
}
}
}
}
}
}
return out;
}
private static final long MEGABYTE = 1024L * 1024L;
public static String humanReadableByteCount(long bytes, boolean si)
{
if(true)
{
long ret = bytes / MEGABYTE;
return ret + " MB";
}
int unit = si ? 1000 : 1024;
if (bytes < unit) return bytes + " B";
int exp = (int) (Math.log(bytes) / Math.log(unit));
String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp-1) + (si ? "" : "i");
return String.format("%.1f %sB", bytes / Math.pow(unit, exp), pre);
}
}
Then
final DiskHelper sdDiskHelper = new DiskHelper(DiskHelper.MODE_EXTERNAL_SD);
path = sdDiskHelper.getPath();
You can customize this class.

String secStore = System.getenv("SECONDARY_STORAGE");
File externalsdpath = new File(secStore);
This will get the path of external sd secondary storage.

get images' names in directory

How can I get only images' names in known directory.
Trying use this (from here)
File sdCardRoot = Environment.getExternalStorageDirectory();
File yourDir = new File(sdCardRoot, "yourpath");
for (File f : yourDir.listFiles()) {
if (f.isFile())
String name = f.getName();
// make something with the name
}
but don't works.
How can I do this?

private ArrayList<File> fileList = new ArrayList<File>();
//getting SDcard root path
File root = new File(Environment.getExternalStorageDirectory()
.getAbsolutePath());
getfile(root);
for (int i = 0; i < fileList.size(); i++) {
// getting file name
System.out.println(fileList.get(i).getName());
if (fileList.get(i).isDirectory()) {
                teSystem.out.println("This is Directory not an image");
            }
}
// getfile(file) method
public ArrayList<File> getfile(File dir) {
File listFile[] = dir.listFiles();
if (listFile != null && listFile.length > 0) {
for (int i = 0; i < listFile.length; i++) {
if (listFile[i].isDirectory()) {
fileList.add(listFile[i]);
getfile(listFile[i]);
} else {
if (listFile[i].getName().endsWith(".png")
|| listFile[i].getName().endsWith(".jpg")
|| listFile[i].getName().endsWith(".jpeg")
|| listFile[i].getName().endsWith(".gif"))
{
fileList.add(listFile[i]);
}
}
}
}
return fileList;
}
hope it will help your purpose.