Develop Reference

Access gallery images from pre-installed gallery in Android TV

I am developing android TV application in which i want to access all images which are pre-installed in gallery of Android TV.
I want to load all these images in my application. For that i have dig a google and tried to find solution but i couldn't find anything.
Edit :
As per #AndiGeeky suggested to use ContentProvider. So my question is that does it has the same process for fetching or loading images from gallery using URI as we do normally for mobile devices?
Have anyone done before ? Advanced help would be appreciated !

Please find below method to get image list from ContentResolver:
public ArrayList<String> getImageList() {
ArrayList<String> list_image = new ArrayList<>();
ContentResolver contentResolver = getActivity().getContentResolver();
Cursor cursor = contentResolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null, MediaStore.Images.Media.DATE_ADDED);
if (cursor.moveToLast()) {
do {
list_image.add(cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)));
} while (cursor.moveToPrevious());
cursor.close();
}
return list_image;
}

Android adapter arrayadapter or cursor?

I have to set ListView and to fill it by data. I have bitmaps in external storage and name of that bitmaps in table, also I have other data in sqlite beside name of bitmap.
The mechanism is following. I have to get from table name add to path and load bitmap, also with other data from table for specific row.
Which adapter you can recommend me to use?
I tried with CursorAdapter but didn't get success because I have problem with loading and repeating images in ListView.
Here is part of my code:
holder.pic = (ImageView) view.findViewById(R.id.adapterInterPicture);
holder.picIndex = cursor.getColumnIndexOrThrow(BaseHelper.PIC_DATE);
holder.picCheck = cursor.getString(holder.picIndex);
holder.imagePath = Environment.getExternalStorageDirectory() + "/imagesGallery/"+ holder.picCheck + ".jpg";
holder.options=new BitmapFactory.Options();
holder.options.inSampleSize = 8;
holder.bitmap1 = BitmapFactory.decodeFile(holder.imagePath,holder.options);
After that in bind view I use the folllowing code:
if(holder.bitmap1 == null){holder.pic.setImageResource(R.drawable.intermediate_pic);
}
if(holder.bitmap1 != null){
holder.pic.setImageBitmap(holder.bitmap1);
}

How to delete thumbnails of deleted images in android?

I had links for images in hashset. From that, i downloaded pics.
After I create bitmap from that url, I scan file to put it in gallery so that I can see it in gallery.
I use following code.
MediaScannerConnection.scanFile(obContext, new String[] { f.getAbsolutePath() }, null, null);
To see only those particular images in my custom gallery I use folllowing code
Cursor imagecursor=managedQuery( MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
columns,
MediaStore.Images.Media.DATA + " like ? ",
new String[] {"%myDesiredDirectory%"},
null);
So it is scanning myDesiredDirectory before showing me gallery. And after scanning, gallery has my images.
But now I have 2 problems:
While scanning, it is creating thumbnails for newly downloaded images. These thumbnails also visible in gallery.
So same pic is visible twice. Which is not desired.
in next iteration of my app run, i want to show only new set of images. To achieve that i decided to delete images downloaded from first iteration.
I am using following code to delete all files in that dir
if(dirChk==true){
File dir = new File(Path);
String[] children = dir.list();
String[] pathsOfDeletedThumbs=new String[children.length];
Log.d(LOGGER, "dir contains "+children.length);
for (int i = 0; i < children.length; i++) {
String temp = Path+children[i];
Log.d(LOGGER, "temp is "+temp);
new File(dir, children[i]).delete();
}
but still those automatically created thumbnails are present in gallery.
Can anybody please help me to avoid creating thumbnails, and if its not avoidable, can we delete thumbnails also when we delete original files??
Thanks in advance...

Displaying images from a specific folder on the SDCard using a gridview

I'm attempting to create a gridview that is loaded with images from a specific folder that resides on an SDCard. The path to the folder is known, ("/sdcard/pictures") , but in the examples I've seen online I am unsure how or where to specify the path to the pictures folder I want to load images from. I have read through dozens of tutorials, even the HelloGridView tutorial at developer.android.com but those tutorials do not teach me what i am seeking.
Every tutorial I have read so far has either:
A) called the images as a Drawable from the /res folder and put them into an array to be loaded, not using the SDCard at all.
B) Accessed all pictures on the SDCard using the MediaStore but not specifying how to set the path to the folder I want to display images form
or
C) Suggested using BitmapFactory, which I haven't the slightest clue how to use.
If I'm going about this in the wrong way, please let me know and direct me toward the proper method to do what I'm trying to do.

OK, after many iterations of trying, I finally have an example that works and I thought I'd share it. My example queries the images MediaStore, then obtains the thumbnail for each image to display in a view. I am loading my images into a Gallery object, but that is not a requirement for this code to work:
Make sure you have a Cursor and int for the column index defined at the class level so that the Gallery's ImageAdapter has access to them:
private Cursor cursor;
private int columnIndex;
First, obtain a cursor of image IDs located in the folder:
Gallery g = (Gallery) findViewById(R.id.gallery);
// request only the image ID to be returned
String[] projection = {MediaStore.Images.Media._ID};
// Create the cursor pointing to the SDCard
cursor = managedQuery( MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
projection,
MediaStore.Images.Media.DATA + " like ? ",
new String[] {"%myimagesfolder%"},
null);
// Get the column index of the image ID
columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media._ID);
g.setAdapter(new ImageAdapter(this));
Then, in the ImageAdapter for the Gallery, obtain the thumbnail to display:
public View getView(int position, View convertView, ViewGroup parent) {
ImageView i = new ImageView(context);
// Move cursor to current position
cursor.moveToPosition(position);
// Get the current value for the requested column
int imageID = cursor.getInt(columnIndex);
// obtain the image URI
Uri uri = Uri.withAppendedPath( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, Integer.toString(imageID) );
String url = uri.toString();
// Set the content of the image based on the image URI
int originalImageId = Integer.parseInt(url.substring(url.lastIndexOf("/") + 1, url.length()));
Bitmap b = MediaStore.Images.Thumbnails.getThumbnail(getContentResolver(),
originalImageId, MediaStore.Images.Thumbnails.MINI_KIND, null);
i.setImageBitmap(b);
i.setLayoutParams(new Gallery.LayoutParams(150, 100));
i.setScaleType(ImageView.ScaleType.FIT_XY);
i.setBackgroundResource(mGalleryItemBackground);
return i;
}
I guess the most important section of this code is the managedQuery that demonstrates how to use MediaStore queries to filter a list of image files in a specific folder.

You need to do a few more steps than the GridView tutorial on developer.android.com. Using the following tutorial
http://developer.android.com/resources/tutorials/views/hello-gridview.html
You'll want to add a method to create ImageView's of the files from your sd card:
Create/add a Vector to your class variables (to hold a list of ImageViews):
private Vector<ImageView> mySDCardImages;
Initialize the vector:
mySDCardImages = new Vector<ImageView>();
Create a method to load images:
List<Integer> drawablesId = new ArrayList<Integer>();
int picIndex=12345;
File sdDir = new File("/sdcard/pictures");
File[] sdDirFiles = sdDir.listFiles();
for(File singleFile : sdDirFiles)
{
ImageView myImageView = new ImageView(context);
myImageView.setImageDrawable(Drawable.createFromPath(singleFile.getAbsolutePath());
myImageView.setId(picIndex);
picIndex++;
drawablesId.add(myImageView.getId());
mySDCardImages.add(myImageView);
}
mThumbIds = (Integer[])drawablesId.toArray(new Integer[0]);
Then down in your ImageAdapter method, change
imageView.setImageResource(mThumbIds[position]);
to
imageView.setImageDrawable(mySDCardImages.get(position).getDrawable());
Remove from the ImageAdapter the initialization of mThumbIds. (it should be up with the definition of mySDCardImages. Accessible to both class methods.)
(Quick and dirty version) Make sure to test your path, etc and catch any Exceptions.

In your case BitmaFactory might be a good way to go. Example:
File dir = new File( "/sdcard/pictures" );
String[] fileNames = dir.list(new FilenameFilter() {
boolean accept (File dir, String name) {
if (new File(dir,name).isDirectory())
return false;
return name.toLowerCase().endsWith(".png");
}
});
for(string bitmapFileName : fileNames) {
Bitmap bmp = BitmapFactory.decodeFile(dir.getPath() + "/" + bitmapFileName);
// do something with bitmap
}
Not time to test this but should work ;-)

read this link: http://androidsamples.blogspot.com/2009/06/how-to-display-thumbnails-of-images.html
it shows how to use both mediastore and bitmapfactory.
the way you should chose depends on what exactly you need. if you have a static set of images, it's much better idea to put them to drawables, i think, cause this way it's faster and you don't rely on sd card, which can be removed, corrupt or files could be renamed/deleted
if images are dynamic, then use mediastore or bitmap factory. but keep in mind that putting images into array or something it's quite memory consuming, so you can end up having outofmemory exception

Looks like you want custom gallerry, it will take much time for you,
I suggest you get Custom Camera Gallery for your working.
You will get Photos/Videos in Grid View as you want.

for Kotlin code see the answer of this question
the idea is alslo applicable for java (but you need to modify the code)

Android: Cursor results to String[]

I have a query in my android app that pulls all image paths from a custom table and displays them to a gallery. The problem is with my database I cant seem to get a row of the database to a String[]. I can easily get the results to a listArray but I need the image path in a string or string array. I want to be able to click on an image in the gallery and have it pull up full screen to be able to zoom in on it or delete it etc. This is the basic query i use
public void listimages() {
SimpleCursorAdapter adapter;
String[] columns = {"Image", "ImageDate", "_id"};
query = new TableImages(this);
queryString = query.getData("images", columns, null, null, null, null, "ImageDate", "DESC");
int to[] = {R.id._id1, R.id._id2};
adapter = new SimpleCursorAdapter(this, R.layout.imagelist, queryString, columns, to);
Gallery g = (Gallery) findViewById(R.id.gallery);
g.setAdapter(adapter);
g.setOnItemClickListener(this);
try {
query.destroy();
} catch (Throwable e) {
e.printStackTrace();
}
}
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent i = new Intent(ViewAllImages.this, ImageViewer.class);
Bundle b = new Bundle();
//I want to be able to use this -> b.putString("image_path", Image);
b.putlong("id", id);
i.putExtras(b);
startActivity(i);
}
This passes the ID to my next activity and the next activity queries the DB pulling that one image path. I still have to use a listview to display the image which makes the app crash on the phone due to memory usage (image is too large).
I can compress the image but I need the path as a string and I cant figure out how to do that without creating a custom content provider or adding a textview and using gettext.toString and thats just getto. My head is killing me as it is with all the reading and coding I have done lol. I have searched all over Google and different forums but I am having problems finding an answer.
Is there a way to use the existing query and get a string or a string array as the result?
Thanks.

I just ended up building a custom content provider. Now I have alot more flexability in my queries.