I am creating an Android app where a user can draw, add text, or image on to the canvas.
After the user has finished editing on th canvas there is an option for saving.
When I try to save that as an image, the resulting output image is of very low resolution.
canvas.setDrawingCacheEnabled(true);
canvas.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
Bitmap bitmap = canvas.getDrawingCache();
String path = Environment.getExternalStorageDirectory().getAbsolutePath();
File file = new File(path+"/image.jpg");
FileOutputStream ostream;
try {
file.createNewFigle();
ostream = new FileOutputStream(file);
bitmap.compress(CompressFormat.JPEG, 100, ostream);
ostream.flush();
ostream.close();
Toast.makeText(getApplicationContext(), "image saved", 5000).show();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(), "error", 5000).show();
}
I want the image to be saved as A3 300dpi. Is there any possible way?
Try to save text, images and all drawing as objects and when the user clicks the save button create a new bitmap with required resolution and translate the current canvas to the required one
I think this is because of using bitmap.compress(CompressFormat.JPEG, 100, ostream); use PNG instread of JPEG
Hope you be ok
Related
I'm using an app to get the gps location and draw it as a circle on a bitmap then save it to proceed, so I need repetitively to read and save the file. But unfortunately when I save the file and read it, the file is damaged after some iterations...! the code:
File output = new File(tmpDirectory, "map.jpg");
try {
OutputStream outputStream = new FileOutputStream(output);
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
outputStream.flush();
outputStream.close();
} catch (Exception ex) {
Message("error!");
}
directory = tmpDirectory;//updating directory to load the manipulated image
readFile(directory + "map.jpg", false);//setting the image view new image
image included:picture after iterations
image included:
main image
JPEG uses lossy compression. That means with each iteration you will lose some quality. You should use loseless format like PNG if you want to preserve it.
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream);
I want to take screenshot of my WebView by clicking on menu item . And then I want to draw on this screenshot and save it on my sdcard.
I've also found the solution of taking screenshot and saving. Here it is:
private void getScreen(View content) {
Bitmap bitmap = content.getDrawingCache();
File file = new File("/sdcard/screen.png");
try {
file.createNewFile();
FileOutputStream ostream = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, ostream);
ostream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
and on onOptionsItemSelected() method:
View content = findViewById(R.id.webview_main);
content.setDrawingCacheEnabled(true);
getScreen(content);
It`s work ok, but I want to implement drawing on it too. If anyone know, how to do this, tell me please,
I will be very grateful.
I am frustrated searching almost every google page for this problem.
I need to save my bitmap to file.
I have used this method several times with no problem at all. But now I am having a problem.
The Bitmap I am saving is a round image with transparency and having .png format which I have placed in res folder. But I am getting black portion in place of transparent portion.
This is the code I am using for saving the bitmap.
void saveImage(Bitmap bmp) {
try {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, bytes);
finalImg = new File(Environment.getExternalStorageDirectory(),
"emoticon_temp" + ".png");
finalImg.createNewFile();
FileOutputStream fo = new FileOutputStream(finalImg);
fo.write(bytes.toByteArray());
fo.flush();
fo.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
I am saving this bitmap as file because I need to share this image and for sharing the image I need the Stream Uri.
If you got any other Idea for sharing a bitmap, please let me know.
I created canvas that can be used to draw some shapes on it.
How can I save its content to PNG file on user's SD card?
check out this link this link
In this link you can find the method
void saveImage() {
try {
String filename = Environment.getExternalStorageDirectory().toString();
File f = new File(filename ,"myImage.png");
f.createNewFile();
System.out.println("file created " + f.toString());
FileOutputStream out = new FileOutputStream(f);
Bitmap bitmap = showImage(urlStr);
bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
} catch (Exception e) {
e.printStackTrace();
}
}
which is used to save the image that you got into a bitmap. and check this link for getting bitmap from canvas
hope this helps you.
Happy coding
Canvas is just a means to draw to the Bitmap.
You should have created Canvas with new Canvas(myBitmap);. So when you draw on the Canvas, it draws to your bitmap.
so using myBitmap Do the following (code here:
String fileName = Environment.getExternalStorageDirectory() + "/test.png";
OutputStream stream = new FileOutputStream(fileName);
/* Write bitmap to file using JPEG or PNG and 80% quality hint for JPEG. */
myBitmap.compress(CompressFormat.PNG, 80, stream);
stream.close();
I created canvas that can be used to draw some shapes on it.
How can I save its content to PNG file on user's SD card?
check out this link this link
In this link you can find the method
void saveImage() {
try {
String filename = Environment.getExternalStorageDirectory().toString();
File f = new File(filename ,"myImage.png");
f.createNewFile();
System.out.println("file created " + f.toString());
FileOutputStream out = new FileOutputStream(f);
Bitmap bitmap = showImage(urlStr);
bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
} catch (Exception e) {
e.printStackTrace();
}
}
which is used to save the image that you got into a bitmap. and check this link for getting bitmap from canvas
hope this helps you.
Happy coding
Canvas is just a means to draw to the Bitmap.
You should have created Canvas with new Canvas(myBitmap);. So when you draw on the Canvas, it draws to your bitmap.
so using myBitmap Do the following (code here:
String fileName = Environment.getExternalStorageDirectory() + "/test.png";
OutputStream stream = new FileOutputStream(fileName);
/* Write bitmap to file using JPEG or PNG and 80% quality hint for JPEG. */
myBitmap.compress(CompressFormat.PNG, 80, stream);
stream.close();