Develop Reference

Android: Saving a bitmap Image

I have a button that allows the user to save a bitmap image to his/her gallery in a seperate folder after applying modifications on some of pixel bits as shown below
Random rand= new Random(TimeZone.LONG);
File root=null;
File file = null;
try{
root= Environment.getExternalStorageDirectory();
file = new File(String.format("%s/IMG_%d.png", root.getCanonicalPath(), Math.abs(rand.nextInt()%100000)));
FileOutputStream out = new FileOutputStream(file);
btmImg.compress(Bitmap.CompressFormat.PNG, 100, out);
MediaStore.Images.Media.insertImage(getContentResolver(), file.getCanonicalPath(), file.getName(), file.getName());
out.flush();
out.close();
Toast.makeText(getApplicationContext(), "File is Saved in " + file, 2000).show();
}
The problem is that when I press 'save' button. The image that appears in the user's gallery is not the modified version it is a duplication of the original or something like that. To get the modified version I had to refresh the gallery (by deleting the applications running in the background).
Anyone has an idea about how to solve this !!

Android: write photo files on SD Card that are viewable in the gallery

I'm trying to found a way (compatible with android kitkat and next) to write photos on the SD Card and make them visible to the gallery app.
If I use Environment.getExternalStoragePublicDirectory , samsung devices return a path in internal memory (/storage/emulated/0/ ... )
If I use Context.getExternalFilesDirs , there are two results : the first one on internal storage, and the second one on SD Card. Ok, I can write inside and the photo is on the SDCard. But I can't see it in the Galery app :'(
I have tried to write directly on /storage/externalSdCard/DCIM/ but of course I can't since I'm running kitkat.

Ok, I can write inside and the photo is on the SDCard. But I can't see it in the Galery app
First, when you are done writing to the file, call flush(), then getFD().sync(), then close(), all on your FileOutputStream.
Then, use MediaScannerConnection and its scanFile() method to get the newly-written file indexed by the MediaStore.

void saveImage() {
File filename;
try {
String path = Environment.getExternalStorageDirectory().toString();
new File(path + "/folder/subfolder").mkdirs();
filename = new File(path + "/folder/subfolder/image.jpg");
FileOutputStream out = new FileOutputStream(filename);
bitMapImg.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
MediaStore.Images.Media.insertImage(getContentResolver(), filename.getAbsolutePath(), filename.getName(), filename.getName());
Toast.makeText(getApplicationContext(), "File is Saved in " + filename, 1000).show();
} catch (Exception e) {
e.printStackTrace();
}
}

saving bitmap from arraylist to SD card - saved file unreadable

My situation is as follows: I'm saving multiple bitmaps from an arraylist to a specific folder in my devices SD Card (with success), however, the saved file- when clicked- prompts a message from the phone, stating: "Unable to find application to perform this action." The file size of this file is proportional to that of the bitmap image being saved, so I'm a bit confused, as the device has no problems opening image files, yet cannot open (or identifiy) these as a media file.
Question: What would cause the saved image file (presuming that I have saved it correctly) to exhibit this type of behavior in a device, and how should I resolve this issue?
Extra: the thumbnail of the file is the system provided thumbnail of the two papers on top of each other. The arraylist is being passed from one activity to its current one where the method provided is supplied.
Here is the method invoking the saving of the files to the specified folder /filesdestination:
private void saveImages(){
// to retrieve bitmaps
ArrayList<Bitmap> images = getIntent().getParcelableArrayListExtra("images key");
//to retrieve bitmaps and save in specific order, while also naming them in that order
int loopVal = 0;
int postVal = 9;
while ( loopVal < 9) {
Bitmap Image = images.get(loopVal);
try {
String filedestination = new String(Environment.getExternalStorageDirectory() + "/filedestination");
String timeStamp = new SimpleDateFormat("ddMMyyyy_HHmm").format(new Date());
File file = new File(filedestination, postVal + ".post_order" + ".jpg" + timeStamp);
File picfile = file;
FileOutputStream fos = new FileOutputStream(picfile);
Image.compress(Bitmap.CompressFormat.PNG, 100, fos);
fos.close();
} catch (Throwable e) {
e.printStackTrace();
}
postVal--;
loopVal++;
}
}
Any insight would be appreciated,
-Lucas

i think it cannot read the file type because the timestamp is after the file extension jpg and you are also compressing it as a png, so you might want to change either or, something like this
File file = new File(filedestination, postVal + timeStamp +".post_order" + ".png");

It seems that you are saving a .jpg file compressed as a PNG. That can make the image reader app to misbehave.
Either change Image.compress(Bitmap.CompressFormat.PNG, 100, fos);
to
Image.compress(Bitmap.CompressFormat.JPEG, 100, fos);
or change
File file = new File(filedestination, postVal + ".post_order" + ".jpg" + timeStamp);
to
File file = new File(filedestination, postVal + ".post_order" + ".png" + timeStamp);

Add Image using Image path in android

I want to save an image in my directory from select image gallery so I have problem to save dynamic image which is save I have select
so what solution for me
Bitmap bitmap;
OutputStream output;
// Retrieve the image from the res folder
bitmap = BitmapFactory.decodeResource(getResources(),R.drawable.wallpaper);
// Find the SD Card path
File filepath = Environment.getExternalStorageDirectory();
// Create a new folder in SD Card
File dir = new File(filepath.getAbsolutePath()
+ "/Attitude/");
dir.mkdirs();
// Create a name for the saved image
File file = new File(dir, "myimage.png");
// Show a toast message on successful save
Toast.makeText(MainActivity.this, "Image Saved to SD Card",
Toast.LENGTH_SHORT).show();
try {
output = new FileOutputStream(file);
// Compress into png format image from 0% - 100%
bitmap.compress(Bitmap.CompressFormat.PNG, 100, output);
output.close();
}
catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return false;
}
};

saving picture from my app

The idea of my app is to capture image from camera then crop specified area from it.
The problem :
When i save the cropped image in my sd card for the first time to launch the app, it saved properly. but when run my app one more time and take image then crop it. when save it the first image that take and crop at first time appear in the sd card not the current one.
This is my code for save images:
public static void save(Activity activity, Bitmap bm, String name) {
OutputStream outStream = null;
File externalFilesDir = activity.getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File outFile = new File(externalFilesDir, "IDOCR" + File.separator + "Numbers");
if (!outFile.exists())
outFile.mkdirs();
File number = new File(outFile, name + ".PNG");
//if (number.exists())
// number.delete();
try {
//outStream = new FileOutputStream(new File(path));
outStream = new FileOutputStream(number);
bm.compress(Bitmap.CompressFormat.PNG, 100, outStream);
outStream.flush();
outStream.close();
bm.recycle();
System.gc();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

Maybe if you are trying to overwrite the previous version of the file, you should first delete the previous one...
You can add:
if (!outFile.exists())
outFile.mkdirs();
else {
outFile.delete();
outFile.createNewFile();
}