PImage.resize() always causes crash about processing-android-archive HOT 6 CLOSED

Not having my tablet in front of me, I believe the error might be with you accessing the image's pixels. While you can do this the way you have it in the desktop version, if memory serves the Android mode will cause an NPE if you don't include img.loadPixels() and img.updatePixels() first.

from processing-android-archive.

I have chosen the example so no external file is needed, however if the image is created using the loadImage() method (and pixels are not accessed), the crash occurs as well. E.g. extension of the LoadDisplayImage example:

PImage img;  // Declare variable "a" of type PImage

void setup() {
  size(640, 360);
  // The image file must be in the data folder of the current sketch 
  // to load successfully
  img = loadImage("moonwalk.jpg");  // Load the image into the program  
  img.resize(100,100);
}

void draw() {
  // Displays the image at its actual size at point (0,0)
  image(img, 0, 0);
  // Displays the image at point (0, height/2) at half of its size
  image(img, 0, height/2, img.width/2, img.height/2);
}

crashes with:
FATAL EXCEPTION: Animation Thread
java.lang.NullPointerException
at android.graphics.Bitmap.checkPixelsAccess(Bitmap.java:834)
at android.graphics.Bitmap.setPixels(Bitmap.java:892)
at processing.core.PGraphicsAndroid2D.imageImpl(Unknown Source)
at processing.core.PGraphics.image(Unknown Source)
at processing.core.PApplet.image(Unknown Source)
at processing.test.loaddisplayimage.LoadDisplayImage.draw(LoadDisplayImage.java:41)
at processing.core.PApplet.handleDraw(Unknown Source)
at processing.core.PGraphicsAndroid2D.requestDraw(Unknown Source)
at processing.core.PApplet.run(Unknown Source)
at java.lang.Thread.run(Thread.java:1019)

But, actually, based on your suggestion I have tried adding pixel manipulation methods to the code and the following version (img.loadPixels() is added after resize) works:

PImage img;  // Declare variable "a" of type PImage

void setup() {
  size(640, 360);
  // The image file must be in the data folder of the current sketch 
  // to load successfully
  img = loadImage("moonwalk.jpg");  // Load the image into the program  
  img.resize(100,100);
  img.loadPixels();
}

void draw() {
  // Displays the image at its actual size at point (0,0)
  image(img, 0, 0);
  // Displays the image at point (0, height/2) at half of its size
  image(img, 0, height/2, img.width/2, img.height/2);
}

I am not familiar with method Processing internally works with images, but I assume that the requirement the explicit call of img.loadPixels() is not intentional.

from processing-android-archive.

Duplicate of #22.

from processing-android-archive.

why it is closed ? i didn't find the solution for this resize() problem. i just got the same issue.

from processing-android-archive.

It's not really closed as in fixed, it's closed as a duplicate. The report is still open at #22.

from processing-android-archive.

Actually, it's processing/processing-android#21; this repository is archived.

from processing-android-archive.