I'm making a simple Android application to show all the countries and their flags. I want to use Room and SQLite to store the flag images but I dont really know which is the best way.
I can store the Flag images as names such as "france" and later retrieve them with:
getResources().getIdentifier("france","drawable",requireActivity().getPackageName())
But I am warned that this will be really slow and with hundreds of countries the app wont be good. At the moment I have all the flag icons in the res/drawables folder, so what is the best way to save them into the database and retrieve later? Thank you.
If You want to store drawables in Room DB, You have to convert it into byteArray.
Drawable d;
Bitmap bitmap = ((BitmapDrawable)d).getBitmap();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] bitmapdata = stream.toByteArray();
define column in room as byte[].
Related
I am working on an Android app like Notepad.
There are two sections.
Text Only
Text with images
A notepad which can only get text from user and save it in db and then retrieve is done.
The another section, will work basically like MS Word.
User can select image from gallery and save it in notepad.
But how can I achieve it? Because I want to store that whole data (image & text) into db as it is. Means suppose user added an image after 2 lines of text. Then app should retrieve it from db in that format only.
Any suggestions? Please help me. Thanks in advance.
The most simple solution would be to define tags or some other form of markup language, that would store that image within a text as a path to file on Disk for example which is imho better alternative than storing it in SQLite but if you insist on database, you can store something like an imageId and keep it the there... However, you are manually doing something, that has already been optimized for you when trying to handle the byte array instead of a file in memory ..
Once you store images in this custom markup language, you can parse it and split the text on chunks between the images which you populate dynamically to some ViewGroup(i.e. LinearLayout) as separate TextViews and ImageViews...
Finally, if you want a solution quickly, you can use some already developed libraries such as this : https://android-arsenal.com/details/1/1696 ... However, this pattern is so common that you can find a great number of libraries that do exactly the thing you are looking for ...
Don't reinvent the wheel if it's not necessary..
You can save the byteArray or uri of images in the database.
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher); ByteArrayOutputStream stream = new ByteArrayOutputStream(); bmp.compress(Bitmap.CompressFormat.PNG, 100, stream); byte[] byteArray = stream.toByteArray();
String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
Uri uri = Uri.parse(path);
Hope this helps ....
Is there a way to know if a byte array is a valid image?
I am taking a photograph, In OnActivityResult:
Bitmap imageBitmap = (Bitmap) extras.get("data");
imageBitmap.compress(Bitmap.CompressFormat.JPEG, 75, out);
//arrayFotos is an ArrayList
arrayFotos.add(new BeanFotos("", imageBitmap, lastKnwonLocation.getLatitude(), lastKnwonLocation.getLongitude()));
I am storing it in database:
//listaFotos and arrayFotos are the same array, but with different names, because I am storing it in another class in my app
for(int i=0;i<listaFotos.size();i++){
values.clear();
values.put("codficha", codficha);
int bytes=listaFotos.get(i).getFoto().getByteCount();
ByteBuffer buffer = ByteBuffer.allocate(bytes);
listaFotos.get(i).getFoto().copyPixelsToBuffer(buffer);
values.put("foto", buffer.array());
db.insert("fotos", null, values);
}
Later, I need that image to be shown:
byte[] arrayFoto = csr2.getBlob(0);
Bitmap fotoBitmap=BitmapFactory.decodeByteArray(arrayFoto, 0, arrayFoto.length);
The problem is, no matter what i do, the decodeByteArray method always returns null. I have tried with external libraries, and it is always null, so I am thinking maybe I am storing it in the wrong way. The arrayFoto variable is NOT null, I am receiving bytes (84584, to be exact) but the decodeByteArray method returns null.
So, is there a way for me to be sure that the byte array is a correct image?
Thanks.
It seems you are writing the uncompressed Bitmap to the database. You need to compress it to jpeg or png first if you want to be able to decode it using BitmapFactory.
Also, storing images in a database is a bad idea since the cursor window size is limited to 1MB. You should not store binary data in a SQLite db unless it's very small.
i have one questions, how to convert Multiple picture to byte array (byte []), cause i have case to save many picture in my database sqlite, i have array list which contains picture in drawable folder..
ArrayList<Integer> imageId = new ArrayList<Integer>();
imageId.add(R.drawable.a1);
imageId.add(R.drawable.a2);
imageId.add(R.drawable.a3);
imageId.add(R.drawable.a4);
imageId.add(R.drawable.a5);
Then i have tried this code to convert into byte arrray
Bitmap b = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.a1);
//calculate how many bytes our image consists of.
int bytes = b.getByteCount();
ByteBuffer buffer = ByteBuffer.allocate(bytes); //Create a new buffer
b.copyPixelsToBuffer(buffer); //Move the byte data to the buffer
byte[] array = buffer.array();
System.out.println(array);
The code below is working, but the problem is how the code below is convert one picture, and now i need to convert multiple picture in arrayList, can anybody help me? cause i have tried with looping, it give me an error, java.lang.OutOfMemoryError..
Ok,
first of all do not save whole pictures to SqLite. It is not a suitable way. There's a very easy solution but a little risky..
Just save images to SD Card as WhatsApp do and save their path to SqLite. So whenever you want to access your pictures you can read their paths from Sqlite and access them.
But the risk is pictures are in user control, so they can remove it. But you can hide the pictures in a deep way :)
Recently I was working on MySql and Sql, where I found I can almost insert everything primitive type data but is it possible to store a jpeg/jpg/bmp/png (image)file in a database. If so then can you please write the code. Don't need to explain the whole thing just the key point.
Thanks
1 Perhaps convert the image to a Byte Array (if it's not bmp, then convert it), then store it in MySql as a Blob type, then when reading it, you can create a Bitmap through the code (I don't know what language you're using) with the Byte Array with what you read, or perhaps just get the code associated with the image and store that and read it.
Converting an image to a Byte Array
2 Use an image hosting API (like Imgur) and have the user's image upload to that site, and just read the URI from the database whenever you want to use it.
Imgur API, Android Example
there is 3 cases how to make it (that is i know)
Save path from SD card like String in database
Save int value if image is in res folder of your app.
Save url like String if image is in Internet.
Sorry for the late response. However, I found a way to convert the image to String and then store it in the mysql.
This answer is just for those who are still looking for a easy solution:
code:
Bitmap bm = BitmapFactory.decodeFile("/path/to/myImage.jpg");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] b = baos.toByteArray();
and then:
String encodedImage = Base64.encodeToString(byteArrayImage, Base64.DEFAULT);
Then the encodedImage which is a String format, I can insert into the db.
Hope that helps other who are still looking for the answer.
I'm wondering what the best way to store a local phone contact's icon is. I'm writing a manager that will allow the user to select contacts for display in a list which now needs contact icon display.
Would storing the icon in a different location on select work or should I try the route of storing the location of the icon and linking to it that way? Can anyone who has went through this already point me in the right direction? I'm using an Sqlite database to store the contacts already.
Any code/links would be very helpful.
Since you are already storing the contacts in an Sqlite db, I'd just add another field to that db that will hold an encoded image.
The way I have gone to solve a similar issue is: I used Base64 for encoding an image into a String and then I store that String wherever I want...
I added one function to the Base64 class to directly encode a Bitmap object for me and return a String, here's the code:
public static String encodeBitmap(Bitmap bmp) {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] buf = stream.toByteArray();
return encodeBytes(buf);
}
where encodeBytes(buffer) is already an implemented function of the Base64 class.
This would be a better way of doing it than storing the path to the image, because a user can easily change the path and then your application wouldn't find the picture anymore.
Hope that helps.
First, I'd recommend looking at the Android source and seeing how they do it.
That aside, if the images are smallish, I'd highly recommend creating a proper ContentProvider and storing the images as binary blobs attached to the row using Cursor.getBlob(). See http://developer.android.com/intl/de/guide/topics/providers/content-providers.html#querying for more details.
For larger images, take a look at How to store large blobs in an android content provider?