Develop Reference

Android - how to open image in gallery with delete option

I use following code to open an image in the gallery:
public void onItemClicked(PictureItem item){
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Uri imageUri = FileProvider.getUriForFile(getApplicationContext(), "myapp.fileprovider", new File(item.uri.getPath()));
intent.setDataAndType(imageUri, "image/*");
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
startActivity(intent);
}
This shows my photo in the gallery, but in a 'read-only' mode. I want to be able to delete the image from there, just as if I opened it directly in the gallery.
Which action do I have to use for that? I do not want to use pick, just normal view with the option to delete. I tried ACTION_EDIT but it's not supported (and not quite the right choice neither ...).

I use following code to open an image in the gallery
First, there are hundreds, if not thousands, of "gallery" apps available for Android.
Second, your code simply asks to view an image (with a broken Intent due to your wildcard MIME type). There is no requirement for the app that responds to be a "gallery" app.
I want to be able to delete the image from there, just as if I opened it directly in the gallery.
Then implement that yourself, in your own app, and get rid of the ACTION_VIEW Intent.
Which action do I have to use for that?
There is no Intent action that says "please display this image, but only if you are a gallery app, and, oh, by the way, you must offer a delete option", which appears to be what you want.

How to remove items from the Android file picker drawer?

Is there a way to remove items like "Downloads", "Pictures" or "Videos" sections from the android file picker?
I know that Google Drive for example can be removed using:
intent.putExtra(Intent.EXTRA_LOCAL_ONLY, true);
But how can you remove the others? I'm trying it on a Samsung device, reading through some posts I found out that there might be vendor-related configurations that you have to specify for the intent. Mine looks like this:
Intent intent = new Intent(Intent.OPEN_DOCUMENT);
intent.addCategory(Intent.CATEGORY_OPENABLE)
intent.setType("*/*");

Have you tried to specify the MIME type?
Try changing this
intent.setType("*/*");
To this
intent.setType("image/*");
In this case you won't see videos and audio.
Change the MIME type according to what you need.

Android Marshmallow 6.0, opening gallery via intent says No apps to perform the action

I am trying to open gallery on Nexus 7 with Android 6.0. It does not have in built gallery, but it does have the Google Photos app.
I am using the following code to open the gallery :
Intent i = new intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
// Always show the chooser (if there are multiple options available)
startActivityForResult(Intent.createChooser(i, "Select Picture"), PICK_IMAGE_REQUEST);
The above code works well in all the versions below 6.0. And Please note that I am already using RUN TIME PERMISSIONS for accessing gallery and have given the permission to access gallery / or externa storage.
Now when the code is executed, I get a transparent screen with heading "Select Picture" and in the middle a text No Apps can perform this action.
Now what do I do to pick or choose image and use in my app.
Any help is appreciated.
Thanks

I am using the following code to open the gallery
That code has nothing to do with a "gallery". That code is requesting to pick a piece of content from a particular collection of content. There may be zero, one, or several activities on the device that offer to support that Intent structure.
The above code works well in all the versions below 6.0
Only on devices that happen to have one or more activities that satisfies that Intent structure.
Now what do I do to pick or choose image and use in my app.
Intent i = new intent(Intent.ACTION_GET_CONTENT).setType("image/*");
// use PackageManager to see if there is anything that supports this
// Intent structure, or just blindly make the following call and handle
// the ActivityNotFoundException
startActivityForResult(i, PICK_IMAGE_REQUEST);
I am using this code , so that only gallery opens and not any other option to pick image
There is nothing in your code that limits it to just a "gallery".

Not allowed to comment because I don't have enough points. But here's just a suggestion, how about if you just passed the intent directly? Like this:
startActivityForResult(i, PICK_IMAGE_REQUEST);

Use this line of code rather than what you have done
Intent i = new intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, PICK_IMAGE_REQUEST);

Intent to pick images, but not videos

In my Android app, I use the following code to launch an image picker:
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/jpg");
startActivityForResult(intent, INTENT_PICK_IMAGE);
But unfortunately, the system gallery activity that is called by this also display videos. Is there a way to prevent this?

I use this to only allow image types:
intent.setType("image/*");
Edit: setType() is based on MIME type, not file extension (See here: http://developer.android.com/reference/android/content/Intent.html#setType(java.lang.String))

Intent with ACTION_VIEW and uri pointing to a ParcelFileDescriptor in EXTRA_STREAM

what is the correct way how I should form the intent to show content from my app in 3rd party viewers? I need to show images in gallery (or any other image viewer), pdfs in some pdf reader,..
Data gets server through a content provider which implements the openFile() method and returns a output pipe..
ParcelFileDescriptor[] pipe=ParcelFileDescriptor.createPipe();
...
ParcelFileDescriptor.AutoCloseOutputStream stream = new ParcelFileDescriptor.AutoCloseOutputStream(pipe[1]);
PipeThread pipeThread = new PipeThread(fileContents, stream);
pipeThread.start();
return pipe[0];
For images I use this:
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setType("image/*");
intent.putExtra(Intent.EXTRA_STREAM, uri);
I'm creating then a chooser for this intent as usual that's not the issue..
My problem is that although I see for example the Photos app in the chooser, I just cannot open the file in it..It just only opens the gallery with my images.
It's working when I use the action send, apps like gmail, drive, dropbox,..all of them are able to correctly read the image from the provider.
Also Skitch seems to be the only one app which I have tested it on that is able to open the image also using the Intent.ACTION_VIEW action..
Please don't tell me I should just send the URI, I really need to provide the file as a stream, or somehow as a serie of bytes (IPC limitations would be probably against this). I can't save the file to a public directory.

So the issue was that have been setting Intent type and data in two separate method calls..
What I didn't know is that Intent.setType() clears its data and Intent.setData() clears its type..
When I set both data and type through the Intent.setDataAndType() method call, it works even for URI pointing to a stream.
Unfortunately the final implementation is still not working flawlessly everywhere.
It works in default android gallery app, in G+ Photos app, in QuickPic, in Sony gallery app, but it does not work in default HTC gallery neither in default Samsung gallery.
Its just a pity, that its actually not that much dependent on my implementation as on how is it implemented in the 3rd party viewer app.