When downloading a pdf file using DownloadManager, I want to delete it if it already exists in Environment.DIRECTORY_DOWNLOADS.
I check if file exists and delete it using these code:
private boolean fileExists(String fileName) {
File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS),
fileName);
return file.exists();
}
private boolean removeFile(String fileName) {
File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS),
fileName);
return file.delete();
}
removeFile() says that file is deleted, by returning true, and when I look into File Browser only one file is showing up. But when I delete that file it reappers on top of old one. What's wrong?
if i'm not wrong the File file= new File(...) will be your problem.
Because you are using the File class constructor, which is creates a new file to the exact location (File class documentation is here documentation).
Try to give your removeFile(String)method a File type variable, that should do the trick (or use some File 'getting' method from the documentation).
Related
I put some .mp4 file in a folder in my android device internal storage. And then I play this file from my application. It plays well if exists otherwise app crushed.
So before play file I want to check its existence.
I tried below code but no luck.
File file = new File("file:///storage/emulated/0/tutorial/1a1cbfc4-18cb-4637-8405-01bf9bebeda3.mp4");
if (file.exists()) {
LogUtil.printLogMessage(VideoListActivity.class.getName(), "video File", "file exist");
} else {
LogUtil.printLogMessage(VideoListActivity.class.getName(), "video File", "file not exist");
}
i am sure the file is exist in the folder named tutorial in my internal storage.
Use file.isFile() for file & file.isDirectory() for directory,
file.exists() tries to access the file which causes it to crash if the file doesn't exist, file.isFile() uses linux stat, which only returns the information about the file without trying to access it.
Please make proper file name, Replace with File myDirectory = new File(Environment.getExternalStorageDirectory(), dirName);
public Boolean checkFile(){
File file = new File("/storage/emulated/0/tutorial/1a1cbfc4-18cb-4637-8405-01bf9bebeda3.mp4");
if (file.exists()) {
return true;
} else {
return false;
}
}
Use checkfile True/False flag before video play.
Try this
File file = new File(path);
if (!file.isFile()) {
}else{
}
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