Develop Reference

Disable screenshot

I am using below code to view image with the help of default gallery,
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(photoURI, "image/*");
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
startActivity(intent);
But at the same time i want to disable screenshot when users view image using gallery. I can disable screenshot directly for my app screen but can't do when image is viewed from gallery.
Please help me.

You can't. If you need that functionality, don't use gallery and write your own display code. Although that's 99% useless- if a user really wants to screenshot his own phone, he can. Worst case he can grab a second phone and take a picture.

Opening Gallery faster

Is there anyway to open Gallery faster through android studio? like the way facebook messenger does or whatsapp does? I making my own app and every time i tap the button to open gallery, it takes a few seconds. (I know it't not because of the phone because other apps open gallery really fast). Actually it's not that slow either but i'd really like it if it opened with a blink of an eye. Although I do have have a lot of computation on the images like resizing and changing orientations in onActivityResult(), but that shouldn't matter should it? btw here is my code for opening the gallery:
public void openGallery(View view)
{
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);//
startActivityForResult(Intent.createChooser(intent, "Select Picture"),IMAGE_GALLERY_REQUEST);
}
Can anyone help me with this?

Are you using Emulator? If so try Device.
I am using this:
Intent i = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, IMAGE_GALLERY_REQUEST);
It takes only a second or less to open Gallery.

Open camera app with a thunbnail icon

I want to launch Android built-in camera app with a thumbnail icon on the right-bottom. Here is my code to open the camera app.
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
I think I need to put a intent data to do it. I look forward to your help.
Thanks.

Just create an image button, or button or anything you desire really.
In the onclick event add something like:
String saveFileName= Environment.getExternalStorageDirectory() + "/test.png";
// BUILT IN CAMERA
Intent camera = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
camera.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(saveFileName) );
this.startActivityForResult(camera, 1);
Make sure you have necessary permissions set. Like saving to the SDCard.
You are very close, you dont need those flags set. And you should ideally specify where you are saving the image.
If you are wondering how to make the button take a look here

Intent.ACTION_VIEW does not allow edit in gallery app

I have an app which wants to view an image in the gallery app.
I use this code to view it:
File cachedImage = cache.getFile(image.getImageUrl());
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(cachedImage), "image/*");
startActivity(intent);
This works except when I click the edit setting here:
and I get the no apps can perform this action message:
Is there some way to make this work? Do I need to pass additional extras? I know the Gmail app is able to view an image attachment in the gallery and the edit function works. This is on JellyBean.

Is there some way to make this work?
Install an app that can edit pictures. Your screenshots appear to be of the Gallery app, which is presumably trying to use ACTION_EDIT to start an activity to edit the picture, and there is no such activity available.

Pick an image from the Gallery

I have seen a lot of posts about this, and it seems like the code below should work. I have created an SD Card image and added it to the emulator (and that works fine).
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
//intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, 1);
It does launch and allow selection of images, but when I click on an image, everything exits and the emulator returns to the home screen, not the back to my app. My onActivityResult is never called either.
What am I missing?

I found my issue. I was launching the gallery from a sub-activity and that sub activity Intent had the flag FLAG_ACTIVITY_NO_HISTORY which prevented the call back from going to that activity.
thanks.

Use the following intent :
Intent intent = new Intent(Intent.ACTION_GET_CONTENT, null);
intent.setType("image/*");
intent.putExtra("return-data", true);
startActivityForResult(intent, 1);