How can I display images from a specific folder on android gallery

Question

How can I display all images from a specific folder on android gallery like, for example, whatapp does. I`m using MediaScannerConnectionClient

File folder =         


        

Answer 1

You can use android.database.Cursor

public boolean OpenGalleryFromFolder(android.content.Context context, String folderName)
{
    String filePath = android.os.Environment.getExternalStorageDirectory().getPath() + "/Pictures/" + folderName + "/";
    return OpenGalleryFromPathToFolder(context, filePath);
}

// Finds the first image in the specified folder and uses it to open a the devices native gallery app with all images in that folder.
public boolean OpenGalleryFromPathToFolder(android.content.Context context, String folderPath)
{
    java.io.File folder = new java.io.File(folderPath);
    java.io.File[] allFiles = folder.listFiles();

    if (allFiles != null && allFiles.length > 0)
    {
        android.net.Uri imageInFolder = getImageContentUri(context, allFiles[0]);
        if (imageInFolder != null)
        {
            android.content.Intent intent = new android.content.Intent(android.content.Intent.ACTION_VIEW);
            intent.setData(imageInFolder);
            context.startActivity(intent);
            return true;
        }
    }
    return false;
}

// converts the absolute path of a file to a content path
// absolute path example: /storage/emulated/0/Pictures/folderName/Image1.jpg
// content path example: content://media/external/images/media/47560
private android.net.Uri getImageContentUri(android.content.Context context, java.io.File imageFile) {
    String filePath = imageFile.getAbsolutePath();
    android.database.Cursor cursor = context.getContentResolver().query(
            android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            new String[]{android.provider.MediaStore.Images.Media._ID},
            android.provider.MediaStore.Images.Media.DATA + "=? ",
            new String[]{filePath}, null);
    if (cursor != null && cursor.moveToFirst()) {
        int id = cursor.getInt(cursor.getColumnIndex(android.provider.MediaStore.MediaColumns._ID));
        return android.net.Uri.withAppendedPath(android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "" + id);
    } else {
        if (imageFile.exists()) {
            android.content.ContentValues values = new android.content.ContentValues();
            values.put(android.provider.MediaStore.Images.Media.DATA, filePath);
            return context.getContentResolver().insert(
                    android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
        } else {
            return null;
        }
    }
}