Android :: How To Check Selected File Is An Image
Aug 4, 2010
i am trying to display image from gallery now i want to put check if selected file is image then it should be displayed. using following code any one help me out how to achieve this?
User can select video file, image file etc.. anything so i want to allow only images.
CODE:......................
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Jul 31, 2010
I am currently making an app which works with images. I need to implement functionality where the user picks a file stored on the SD card. Once they pick the picture (using the Android gallery), the the file-location of the image will be sent to another Activity, where other work will be done upon it. I have seen similar posts here on SD, but none to answer my question specifically. Basically this is the code I am doing when the user clicks the "Load a Picture" button:
// Create a new Intent to open the picture selector:
Intent loadPicture = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
// To start it, run the startActivityForResult() method:
startActivityForResult(loadPicture, SELECT_IMAGE);
From that code, I then have a onActivityResult() method to listen to the call-back:
// If the user tried to select an image: if(requestCode == SELECT_IMAGE) {
// Check if the user actually selected an image: if(resultCode == Activity.RESULT_OK) {
// This gets the URI of the image the user selected: Uri selectedImage = data.getData();
// Create a new Intent to send to the next Activity:
Intent i = new Intent(currentActivty.this, nextActivity.class);
// - Problem Area -
// I would like to send the filename to the Intent object, and send it over.
// However, the selectedImage.toString() method will return a
// "content://" string instead of a file location. How do I get a file
// location from that URI object? i.putExtra("PICTURE_LOCATION", selectedImage.toString());
// Start the activity outlined with the Intent above: startActivity(i);
As the code above states, the uri.toString() will return a content:// string instead of the file location of the selected picture. How do I obtain the file location?
Another possible solution is to send over the content:// string and convert that into a Bitmap (which is what happens in the next Activity). However, I don't know how to do that.
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Nov 21, 2010
I am creating a group android SMS. Therefore, i need checkbox. But,my problem is i cant figure out how to get the selected contacts?
This my layout...
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May 10, 2010
How do I get the selected items in a ListView which contains a multi selelected check boxes.?
The following code doesn't work correctly... getContacts() is being called in a Button click().
CODE:..................
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Feb 10, 2010
I have an image button as defined below.
CODE:...................
I want to set the default state of the button to be selected. So in code I would say:
CODE:.....
Is it possible to do this in xml?
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Jun 22, 2010
I am using gallery widget i want to change selected image. When i run the following code and i use roller ball or arrow keys over device and if i try to scroll left to right or right to left focus goes out of gallery to next item over the screen what is that ?
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Feb 17, 2010
I have a listview that shows files in a specified folder which works. But what I can't figure out is in the onListItemClick method. How can I get the name of the selected file in the ListView from the ArrayAdapter instead of the position or id?.......................
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Jun 2, 2010
In windows text files are displayed with notepad icon. When we double click the particular file it opens the notepad and displays the file. Like that I need to open the file from the download folder in android. I have used the intent-filter for register my ics files mime type. When I select the file in the download folder it just opens my application only. At that time I need to open / read the selected file. How to do this?
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Aug 24, 2010
Is there a way to load an image file into an ImageView object, and then define a transparent color for this object?
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Mar 19, 2010
I am assigning to an ImageView contacts images using this code:
mPhotoView = (ImageView) findViewById(R.id.photo);
mPhotoView.setImageURI(objItem.getPhotoUri());
If the contact has no image, this does nothing, and no error is raised.
When there is no image, I want to add a default image. So I need to check either if the image was added to the view, or check that the URI holds some image data
Than I will set default image by this:
mPhotoView.setImageResource(R.drawable.ic_contact_picture_2);
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Sep 22, 2010
How can i check does image set in ImageView or no, exists standard methods?
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Jul 24, 2010
I use the below code to create a file in my application.I need to check is the file is exist or not from my code ?
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Aug 28, 2010
My app has .txt files in subdirectories in the assets folder. It reads those .txt files and puts them in a textview. It's working great and no problems.
Should I be concerned about the files in the assets folder getting deleted by the user or missing. If this ever could happen, my app would get an error because the file would not be there when it tried to read it into the stream.
Is there a need for me to check the existence of an asset file before I read it or does the asset manager take care of it all? I also was wondering if there's a chance that a user would or could delete and asset file.
Like I say, everything works fine without me inserting code to check for file existence. I just wondered if people use the .exists() statement every time they go to read in a stream from assets.
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Jun 23, 2010
In my Android app I am calling a URL for fetching images and that URL is also fetched dynamically. Sometimes what happened is that the server returns the path of the image but actually there is no image so can we put some kind of validation.
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Jul 8, 2010
I'm doing Major Project on my final year and I'm very new to Android plus I;m not good at codings. I need help with my login page.
I've created something like a database connection java file which is this:
CODE:.......
I've already created a database for users using SQLite. The database name is Users and the table is called User. The records inside the table are Username, Password, LastName, FirstName. I've inserted one user's info into the database. The problem is I do not know whether my UserDB.java is correct.
And I've also created login.java. Hardcoded Login page:
CODE:.........
So I want to know how I should apply the database connection on the login.java. Should I insert database connection something like db.Open();? I studied ASP.Net a few months back and I kind of forget most of what I've learnt. So how should I open the database connection on login.java and how to check with database whether the user enters the right username and password?
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Apr 12, 2010
Anyone know an easy way to check the md5 checksum on a file downloaded with windows (xp)?
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Feb 1, 2010
There are some image files, and I want to get Uri of these image files. In my code, I only know path and file name of image files.
How can I get Uri from its path and file name?
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Apr 29, 2010
I have two png image files that I would like my android app to combine programmatically into one png image file and am wondering if it is possible to do so? If so, what I would like to do is just overlay them on each other to create one file. The idea behind this is that I have a handful of png files, some with a portion of the image on the left with the rest transparent and the others with an image on the right and the rest transparent. And based on user input it will combine the two to make one file to display. (And I cant just display the two images side by side, they need to be one file). Is this possible to do programmatically in android and how so?
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Jan 15, 2010
I realise the correct way to load an image is from res/drawable but imagine that was not a possibility. If you had to load an image from an attached jar file, how would one achieve it?
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Feb 25, 2009
I need to display an image by specifying the file name instead of by using resource. E.g showImage("background.png") instead of showImage(R.drawable.background). Any one knows how?
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Mar 18, 2009
I am using camera to capture snapshots. But i am unable to view taken pictures location. I am also unable to browse sdcard directory using DDMS in eclipse.
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May 8, 2010
I have an image that is currently stored in variable of type "File". File img; What is the easiest way to display this image onto the screen so I can verify it is working correct?
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Jul 19, 2010
In the app I am making, I would like to take a Base64 image that is received from a server, and save it to a file for displaying later. My question is where should I store this file? It needs to be dynamic, and may be empty when the program launches. I am unsure how exactly the file system on Android works, such as how file paths look.
Ideally I would like to be able to write the data to the image file using a FileOutputStream, and then display that image somehow.
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Jun 22, 2009
I want to reduce the size of my image file to transfer it over the network. Do anybody know how can I reduce the file size using andriod APIs.
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Jan 20, 2009
I want to save images from a particular URL into the sqlite db and then display it from the database..Can anyone tell me as how i could do that.
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Jun 17, 2010
i have to change the name of a jpg file , for that i have written the following code sdcard = Environment.get External StorageDirectory(); from = new File(sdcard,image Path. sub string ( 8). toString()); to = new File(sdcard, "/DCIM/RoseVille_"+Info.getText() +"_"+Amount.getText () +"_"+timeStampFormat.format(n ew Date())+".jpg");
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Sep 14, 2010
I want to attach an image with email, that image is stored in /data/data/mypacke/file.png. How can I attach that image file programmatically? What would sample code look like?
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Oct 30, 2010
I know you can't take a screenshot without having root access, but is there a way to render an activity and all the contents to an image file?
anyone have code to do this? it would be nice to have any dialogs, menus, etc... as well, but not required.
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May 24, 2009
I want to use the ninepatch image in the file system. but seems that it can be referenced via res.
how to get the auto-scale support for the images in file system.
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Aug 10, 2010
What i want to do: delete an image file from the private internal storage in my app. I save images in internal storage so they are deleted on app uninstall.
I have successfully created and saved: code...
I have read on the android developer website that i must open private internal files using the openFileInput(...) method which returns an InputStream allowing me to read the contents, which i don't really care about - i just want to delete it.
can anyone point me in the right direction for deleting a file which is stored in internal storage?
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