Maybe but, there should be a method for extensions to work with the Canvas?
Edit: I created a small PR here.
1 Like
This appears to have stopped working with the last release (n195 or something Google)
My code in extension:
@SimpleFunction(description = "Get Canvas Image and returns base64 string")
public void GetCanvasImageAsBase64(final Canvas canvas ) throws Exception {
final View canvasView = (View) canvas.getView();
final Method method = canvasView.getClass().getDeclaredMethod("buildCache");
method.setAccessible(true);
Bitmap imageBitmap = (Bitmap) method.invoke(canvasView);
String encodedString = bitMapToBase64(imageBitmap);
AfterCanvasBase64(encodedString);
}
That's why reflection is a bit unstable over time.
@SimpleFunction(description = "Get Canvas Image and returns base64 string")
public void GetCanvasImageAsBase64(final Canvas canvas ) throws Exception {
Bitmap imageBitmap = canvas.getBitmap();
String encodedString = bitMapToBase64(imageBitmap);
AfterCanvasBase64(encodedString);
}
Calling .getBitmap() should be enough.
But... since I believe the extension build sources are not yet updated, you should use this code instead:
@SimpleFunction(description = "Get Canvas Image and returns base64 string")
public void GetCanvasImageAsBase64(final Canvas canvas) throws Exception {
final Method method = canvas.getClass().getDeclaredMethod("getBitmap");
Bitmap imageBitmap = (Bitmap) method.invoke(canvas);
String encodedString = bitMapToBase64(imageBitmap);
AfterCanvasBase64(encodedString);
}
This one, I can assure you, will not break in future.
Did you mean to leave out this:
final View canvasView = canvas.getView();
???
1 Like
That's not required anymore, the code I posted will work.
Thanks so much, just testing....
Works just fine, if a bit slow (using companion), but it works which is the main thing.
Many thanks again
1 Like
Seems to make a much much bigger base64 string than expected ?
Do It Result: "iVBORw0KGgoAAAANSUhEUgAAAzkAAARMCAYAAAC6Wl3lAAAAAXNSR0IArs4c6QAAAARzQklUCAgI
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"
---
can't actually add all the characters here due to a 32000 character limit, but it was @ 41000...
for this file:
which is set in a canvas 400x300...
That's since because, it appears that Bitmap we are retrieving dosent seem to be compressed like the last time.
Bitmap bitmap = ...
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 75, baos);
Bitmap compressed = BitmapFactory.decodeStream(new ByteArrayInputStream(baos.toByteArray()));
Or you should try tweaking the compression level that is set to 75 here.
Then use the compressed bitmap.
2 Likes
LIke this ?
@SimpleFunction(description = "Get Canvas Image and returns base64 string")
public void GetCanvasImageAsBase64(final Canvas canvas ) throws Exception {
final Method method = canvas.getClass().getDeclaredMethod("getBitmap");
Bitmap imageBitmap = (Bitmap) method.invoke(canvas);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
imageBitmap.compress(Bitmap.CompressFormat.JPEG, 75, baos);
Bitmap compressed = BitmapFactory.decodeStream(new ByteArrayInputStream(baos.toByteArray()));
String encodedString = bitMapToBase64(compressed);
AfterCanvasBase64(encodedString);
}
convert to base64:
public String bitMapToBase64(Bitmap bitMap) {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitMap.compress(Bitmap.CompressFormat.PNG, 100, byteArrayOutputStream);
byte[] byteArray = byteArrayOutputStream.toByteArray();
return Base64.encodeToString(byteArray, Base64.DEFAULT);
}
1 Like