I have used the Android internal storage to save a file for my application (using openFileOutput) but I would like to delete that file, is it possible and how?
File dir = getFilesDir();
File file = new File(dir, "my_filename");
boolean deleted = file.delete();
I know this is a bit of an oldie, but the docs say to use:
deleteFile("filename");
rather than:
File.delete();
Which if you are already using:
getFilesDir();
kind of makes sense.
You should always delete files that you no longer need. The most straightforward way to delete a file is to have the opened file reference call delete() on itself.
myFile.delete();
If the file is saved on internal storage, you can also ask the Context to locate and delete a file by calling deleteFile():
myContext.deleteFile(fileName);
Note: When the user uninstalls your app, the Android system deletes the following:
All files you saved on internal storage
All files you saved on external storage using getExternalFilesDir().
However, you should manually delete all cached files created with getCacheDir() on a regular basis and also regularly delete other files you no longer need.
Source : http://developer.android.com/training/basics/data-storage/files.html
If you want to delete all files from a folder then use the following function:
private void deleteTempFolder(String dir) {
File myDir = new File(Environment.getExternalStorageDirectory() + "/"+dir);
if (myDir.isDirectory()) {
String[] children = myDir.list();
for (int i = 0; i < children.length; i++) {
new File(myDir, children[i]).delete();
}
}
}
Folder must be present on storage. If not we can check one more codition for it.
if (myDir.exists() && myDir.isDirectory()) {
//write same defination for it.
}
new File(mUri.toString).delete();
void clearMyFiles() {
File[] files = context.getFilesDir().listFiles();
if(files != null)
for(File file : files) {
file.delete();
}
}
Another alternative in Kotlin
val file: File = context.getFileStreamPath("file_name")
val deleted: Boolean = file.delete()
Use delete method of File
Related
So I've built some code to download a file which works fine and I have set it to download into the applications directory which works. it's stored in the application folder /files/dltest
My issue is with checking programatically wether or not the file exists, I've tried methods one stackoverflow and for some reason I can only get my hard coded path to work.
/sdcard/Android/Data/com.test.alihassan.download/files/dltest/REQS.pdf
Using built in methods to retrieve the path gives me the same path but with /data/data/com.... and this doesn't work
File mydir = context.getFilesDir();
File fileWithinMyDir = new File(mydir, "myfile/path/fileNmae");
if(fileWithinMyDir.exists()){
//exists
}else{
//not exists
}
Update:
//File mydir = this.getFilesDir();
File mydir = this.getExternalFilesDir("/dltest/REQS.pdf");
if (mydir.exists()) {
//exists
} else {
//not exists
}
I want to check if file exists in my package folder, but I don't want to create a new one.
File file = new File(filePath);
if(file.exists())
return true;
Does this code check without creating a new file?
Your chunk of code does not create a new one, it only checks if its already there and nothing else.
File file = new File(filePath);
if(file.exists())
//Do something
else
// Do something else.
When you use this code, you are not creating a new File, it's just creating an object reference for that file and testing if it exists or not.
File file = new File(filePath);
if(file.exists())
//do something
It worked for me:
File file = new File(getApplicationContext().getFilesDir(),"whatever.txt");
if(file.exists()){
//Do something
}
else{
//Nothing
}
When you say "in you package folder," do you mean your local app files? If so you can get a list of them using the Context.fileList() method. Just iterate through and look for your file. That's assuming you saved the original file with Context.openFileOutput().
Sample code (in an Activity):
public void onCreate(...) {
super.onCreate(...);
String[] files = fileList();
for (String file : files) {
if (file.equals(myFileName)) {
//file exits
}
}
}
The methods in the Path class are syntactic, meaning that they operate on the Path instance. But eventually you must access the file system to verify that a particular Path exists
File file = new File("FileName");
if(file.exists()){
System.out.println("file is already there");
}else{
System.out.println("Not find file ");
}
public boolean FileExists(String fname) {
File file = getBaseContext().getFileStreamPath(fname);
return file.exists();
}
if(new File("/sdcard/your_filename.txt").exists())){
// Your code goes here...
}
Kotlin Extension Properties
No file will be create when you make a File object, it is only an interface.
To make working with files easier, there is an existing .toFile function on Uri
You can also add an extension property on File and/or Uri, to simplify usage further.
val File?.exists get() = this?.exists() ?: false
val Uri?.exists get() = File(this.toString).exists()
Then just use uri.exists or file.exists to check.
I want to check if a text file exists on the SD card. The file name is mytextfile.txt. Below is the code:
FileOutputStream fos = openFileOutput("sdcard/mytextfile.txt", MODE_WORLD_WRITEABLE);
How can I check whether this file exists?
This should do the trick, I've replaced the hard coded SDcard reference to the recommended API call getExternalCacheDir():
File file = new File(getExternalCacheDir(), "mytextfile.txt" );
if (file.exists()) {
//Do action
}
See this file System in android : Working with SDCard’s filesystem in Android
you just check
if(file.exists()){
//
}
*Using this you can check the file is present or not in sdcard *
File file = new File(sdcardpath+ "/" + filename);
if (file.exists())
{
}
You have to create a file, and set it to be the required file, and check if it exists.
String FILENAME="mytextfile.txt";
File fileToCheck = new File(getExternalCacheDirectory(), FILENAME);
if (fileToCheck.exists()) {
FileOutputStream fos = openFileOutput("sdcard/mytextfile.txt", MODE_WORLD_WRITEABLE);
}
Have Fun!
The FileOutputStream constructor will throw a FileNotFound exception if the specified file doesn't exist. See the Oracle documentation for more information.
Also, make sure you have permission to access the SD card.
check IF condition with Boolean type like
File file = new File(path+filename);
if (file.exists() == true)
{
//Do something
}
How can we check the given file is present in Android Filesystem or not without using File inputstream.because I only want to check the existence of the file on the given path.
File myFile = new File("/path/to/file");
if (myFile.isFile()) {
...
}
If you have created a file using openFileOutput method then this works
File mFile = new File(getBaseContext().getFilesDir(),FileName);
if (mFile.exists() )
{
//File is Exits.
}
else
{
//File is not Exits.
}
hope this helps
How can I get names of all folders (not files) in specific directory on SD card? For example all subfolders names in /sdcard/first_level_folder/....
I need folder name, so I can pass complete path (string) to the method which will then compress (zip) it.
Thanks.
I think what you are looking for is
File dir = new File("directoryPath");
FileFilter fileFilter = new FileFilter() {
public boolean accept(File file) {
return file.isDirectory();
}
};
File[] files = dir.listFiles(fileFilter);
Step #1: Use Environment.getExternalStorageDirectory() to get the root of external storage. /sdcard/ is incorrect on most devices.
Step #2: Use the appropriate File constructor to create the File object pointing to your desired directory inside external storage.
Step #3: Use Java I/O to find what is in that directory.
Well you can use something like:
File file[] = Environment.getExternalStorageDirectory().listFiles();
for (File f : file)
{
if (f.isDirectory()) { ... do stuff }
}
well this is a java related question.
Check this out.
To get access to the sdcard folder name :
File extStore = Environment.getExternalStorageDirectory();
String SD_PATH = extStore.getAbsolutePath()+"your sd folder here";
File file=new File("/mnt/sdcard/");
File[] list = file.listFiles();
int count = 0;
for (File f: list){
String name = f.getName();
if (name.endsWith(".jpg") || name.endsWith(".mp3") || name.endsWith(".some media extention"))
count++;
System.out.println("170 " + count);
}
File file[] = Environment.getExternalStorageDirectory().listFiles();
for (File f : file) {
if (f.isDirectory()) {
// ... do stuff
}
}
Step #1: Use Environment.getExternalStorageDirectory() to get the root of external storage. /sdcard/ is incorrect on most devices.
Step #2: Use the appropriate File constructor to create the File object pointing to your desired directory inside external storage.
Step #3: Use Java I/O to find what is in that directory.