Android :: Produce Thumbnail From Pdf
Oct 19, 2010
I am managing a bunch of PDF files in an android application maintaining a list of records in a SQLite database as well as storing the pdf files on the external storage. Now I would like to present a thumbnail of the first page of the pdf in my list view as part of each cell representing a pdf. I am aware of libraries like iText, fop.. on the JavaSE side that can render a PDF but I would rather not delve into embedding a large library like that. On a similar approach I would also rather not embed a native PDF viewer like droidreader, apv or vudroid.
Otherwise I could of course also get it rendered on a server via some webservice but that is a lot of headache as well. I am already using intents to get the pdf's displayed for the user so I was thinking it would be great if I could get a thumbnail via a intent call as a result somehow. However I found nothing on the web (e.g. on openintents) that indicates something like that exists. So I am a bit at a loss on what to do? What do you think is the best approach to get these thumbnails into my app? Are there any public intents available? Or did I just totally miss something and the SDK provides features for that already (it should imho but currently does not)?
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May 25, 2010
Kinda like in the format of a class-dump result but in Java, I already have the Android.jar file and I would like to dump a clean listing of classes and methods for each .class file. How do I do this?
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Mar 26, 2010
I have this piece of code which I'm hoping will be able to tell me how much data I have downloaded (and soon put it in a progress bar), and then parse the results through my Sax Parser. If I comment out basically everything above the //xr.parse(new InputSource(request.getInputStream())); line and swap the xr.parse's over, it works fine. But at the moment, my Sax parser tells me I have nothing. Is it something to do with is.read (buffer) section? code...
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Oct 28, 2009
For my application, I am trying to add entries without having a duplicate entry, and if there are a duplicate notify the user and have him try again. Using SQLite, which I know very very little about, I have tried these two ways and want to know which one is better, more efficient or a better way to develop it? First way:
db.execSQL("INSERT INTO " + DatabaseHelper.DATABASE_TABLE +
"(LATITUDE, LONGITUDE, RATING) SELECT " + latitude + ", " + longitude + ", " + rating +
" WHERE NOT EXISTS (SELECT 1 FROM " + DatabaseHelper.DATABASE_TABLE +
" WHERE LATITUDE = " + latitude + " AND LONGITUDE = " + longitude + ")");
Second way:
long id = -1;
try { id = db.compileStatement(
"SELECT COUNT(*) FROM " + DatabaseHelper.DATABASE_TABLE
+ " WHERE LATITUDE = " + latitude
+ " AND LONGITUDE = " + longitude)
.simpleQueryForLong();
} catch (NullPointerException e) { return -1;
} return id;
The first way, either inserts or ignores the values, I check by doing so, storing the row-count of the rows into a variable before the call, call that function, and then check its results. If the results is not higher than it was before the call, the insert was made ignored, prompt the user with the 'values exist' message. (Very sloppy, I know but desperate times calls for desperate measures). The second way, returns the actual count of rows that match the numbers I want to store, if the number returned greater than 1, prompt the user with the 'values exist' message. I have been going back and forth, trying different ways but I do not know how to set up SQLite to have UNIQUE pairs, which I was told would be the easiest.
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Nov 15, 2010
Something's missing. I've failed the setup. Incoming gmail should produce an alert of some sort, and it's not happening. I haven't found the button, switch, trigger, or ?? to do it.
The mail is on the phone, but new mail should alert me. It doesn't.
Obviously, it's part of google's IQ test - and I didn't pass.
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May 3, 2010
i'm trying to fetch a thumbnail with picture URI using these code below:
long id = ContentUris.parseId(selectedImageURI); String[] projection = { MediaStore.Images.Thumbnails.DATA }; Cursor c = Images.Thumbnails.queryMiniThumbnail(getContentResolver(), id, Images.Thumbnails.MINI_KIND, projection);
unfortunately, it's always return me the null cursor. finally, i found HTC hero never generate picture thumbnail under "sdcardDCIM.thumbnails", but only create a picture under this folder: "sdcardDCIM100MEDIA", which means i can only get the full size picture. What's am i supposed to do? create a thumbnail by myself?
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Jul 18, 2010
I tried to create a video thumbnail as described here. I also read the reference here. In my app I first let the user choose a video with: startActivityForResult(new Intent(Intent.ACTION_GET_CONTENT).setType("video/*"), ACTIVITY_PICKVIDEO);
Then I determine the video ID with: fileID = Integer.parseInt(contentUri.getLastPathSegment());
So, the video content://media/external/video/media/5 would have the ID 5...............
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Aug 10, 2010
I have retrieved some cover art for an album (I have the id and a Bitmap) and now I want to set it into the MediaStore. I tried a bunch of stuff:
private static final Uri ARTWORK_URI = Uri.parse("content://media/external/audio/albumart");
public static void writeArtwork(Context context, Bitmap bmp, int albumId) {
ContentResolver res = context.getContentResolver();
Uri uri = ContentUris.withAppendedId(ARTWORK_URI, albumId);
LogUtil.i(TAG, "uri= " + uri);
if (uri != null) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 50, baos);.............
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Jun 8, 2010
I have this Code to Capture a image and Display it back in ListView onclick of the listitem i can capture image and save to image View, but how can get on the left of the list item?
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Apr 5, 2010
I am having image large size image, at run time i want read image from storage and scale it so that its weight and size will be reduce and i can use it as thumbnail when user click on thumbnail i will display full size image.
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Jan 25, 2010
how will you know that this thumbnail points to which actual image in the SD card. I have a problem with MediaStore.Images.Thumbnails displaying blank previews. Though I followed mihai fonoage part 2 on how to load it properly by using scaling. Still, I got duplicate images. So instead of using MediaStore.Images.Thumbnails I used MediaStore.Images.Media instead but it loads the actual image but oading is too slow even if bitmap is scaled. That's why I was wondering if there's a way to know which actual image is the thumbnail pointing or is there a way to know the exact location of the thumbnail for this actual image (The other way around).
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Jul 28, 2009
i can not view any image in my emulator screen can anyone please tell me where i am doing wrong in my code.
this is my code..................
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Jul 15, 2010
How to obtain ID of an image by the ID of the thumbnail?
And what about going from original image to thumbnail ID? Is that possible? I saw MINI_THUMB_MAGIC but it seems there is an issue with it.
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Sep 3, 2010
I have a video thumbnail and when you click on it, the video starts playing in the YouTube player. This works great, but It's not so clear that you have to click on the thumbnail to play, so I have a play button image that I want to draw over the thumbnail in the bottom right corner. How would I go about this? I currently have the thumbnail in a Drawable object and the play button in my drawable resource directory. I tried stuff with bitmaps and canvas but it's quite hard and I don't know if this is the way to go.
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Nov 12, 2010
I am using MediaStore.Images.Thumbnails.getThumbnail to create bitmap of thumbnail in htc hero , it takes lots of time to execute this. I other device it works faster. Please suggest any alternative to this method to create bitmap thumbnail so speed improves.
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Mar 31, 2010
I know this has to be trivial but I just don't find the right resource, I guess.
So all I want to do is retrieving a thumbnail for a video. All I have is the absolute path to the file on the sdcard as a String. So please point me into the right direction.
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Sep 18, 2009
Hi,
Is there any api on android which generates a Thumbnail image from an inputstream which is a video file?
Thank you.
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Aug 20, 2010
I am developing an app in android, which basically visits a given url and downloads an image. Now i want to populate this downloaded image and show it in thumbnail view. I have tried out displaying the same from SD Card, but when i am doing the same for downloaded files, it doesn't seems to work.
public View getView(int position,View convertView,ViewGroup parent)
{
System.gc();
ImageView i = new ImageView(mContext.getApplicationContext());
if (convertView == null)
{
//imagecursor.moveToPosition(position);
//int id = imagecursor.getInt(image_column_index);
//i.setImageURI(Uri.withAppendedPath(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, ""+ id));
i.setImageBitmap(bitmap);
i.setScaleType(ImageView.ScaleType.FIT_CENTER);
i.setLayoutParams(new GridView.LayoutParams(100, 100));
}
else
{
i = (ImageView) convertView;
}
return i;
}
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Jan 12, 2010
I've got thumbnails which larger side is 70px (e.g 70x40 or 52x70).
I need to create a gray box 70x70px and put the thumbnail in it, so that image is aligned with the box at top vertically and center horizontally.
How to do that?
I've tried with an ImageView 70x70px, gray background, but image is not positioned as it should (it's in vertical and horizontal center, instead of vertical top and horizontal center).
I've also tried wrapping it with LinearLayout 70x70px, gray background and then positioning it, but then i get 1 or 2px line between LinearLayout and ImageView. I tried to set padding and margins to 0, but the gray line stays on...
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Sep 6, 2009
The thumbnail for one of my bookmarks keeps changing spontaneously to show a picture of another website. It's probably not relevant but the bookmark points to this forum!
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May 10, 2010
Is there any way to select which picture will show as the photo album thumbnail? When I open the photo album the picture that shows as the thumbnail is hard to see and I would like to have another pic as the album thumbnail/icon.I have tried erasing all of the photos, clearing the cache and reloading the photos in various orders but no matter what I try the same photo shows as the thumbnail. Is there any way to change it?
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Oct 30, 2010
For a while now the thumbnail gallery has sometimes merged pictures - so on the thumbnail it's actually a combination of more than 1 picture. This hasn't really bothered me until recently because the more pictures I take the worse it's getting, so much so that I can't always tell which picture I'm going to be looking at until I actually select it. In every case the picture views correctly on the screen when I view them one at a time, it's just a problem with the thumbnails. I've attempted to clear the gallery cache which made it appear slightly better but not by much. I've checked the DCIM / .thumbnails folder but there's just loads of files in there saying file and RAW file and to be honest I don't know what it's all about. I've trawled the net and checked the forums but cannot seem to see a solution - does anyone know what I can do in order to solve this?
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Jul 27, 2013
I have an HTC one s, had it for a few months and just today it started to eat up all the memory on the "external card".
It is located in DCIM .thumbnails.
I know there is a fix of changing the folder to read only and sorts.(changing the file to read only works for a few moments then a new file generates with a new number.
But I do not just want to do a fix, I would like to know how I can trace what is causing it and fix it. The thumbnail file keeps increasing in size when I erase more files, right now it is at 1.2gb.
So my question, What is causing the thumbnail to be getting to 1.2gb, a larger size then my photos stored.
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Aug 9, 2010
When you go into photos can you control what photos shows as thumbnail for each album?
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Nov 19, 2009
So today I got a message from a friend and in the message log it just tells me who it's from, the file size and when it expires. I have an option to download it but it fails every time. I doesn't give me any details that I know of it just says it was unsuccessful. The weird thing is that yesterday I got a pic from the same person and it worked fine, thumbnail and everything. What can I do to get this picture? Or make it work correctly in the future? They say they sent it the same way as the day before.
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May 1, 2010
I just recorded a video clip which had a strange effect. When in photo albums, instead of a thumbnail of the video in question, the phone created a thumbnail of a video I have recorded previously and then deleted. Does anyone know how to make the phone recreate all thumbnails for the media files? I am leaning towards deleting all the files in /sdcard/DCIM/.thumbnails/ but not sure this is the way to do it?
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Aug 28, 2012
I'm an iPhone user. Upgraded from a AT&T Samsung Fascinate to a AT&T Galaxy SII Skyrocket.
When we put her SD card from the Fasc into the Sky, all her pictures didn't transfer over, I guess only the main "Camera" album. I used the Astro app and see that the additional images that aren't showing up must be in a subfolder called ".thumbnails", since it's full of image files.
I downloaded Rescan Media and ran that but it didn't work.
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Oct 27, 2010
I want to take a picture with camera, after read the document and googling,I found, if i don't want the original picture,i just use
Code...
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Oct 19, 2010
today i meet the problem.i need technic can control the android machine from server.then i want send data from server to android with no request from android.
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Apr 14, 2010
I'm trying to open a dialog window, but every time I try to open it it throws this exception:
CODE:.................
I'm creating it by calling showDialog with the display's id. The onCreateDialog handler logs fine and I can step through it without an issue, but I've attached it since it seems like I'm missing something:
CODE:............
Is there something missing from this? Some questions have talked about having this problem when creating a dialog from onCreate, which happen because the activity isn't created yet, but this is coming from a call from a menu object, and the appContext variable seems like it is correctly populated in the debugger.
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