Application randomly (mostly) crashed at start.

[unrealkate]

When building sketch with Processing IDE 3.2.1 in Android Mode on PC, installed APK fails to start on mobile phone, randomly crashing at start. After hitting the icon several times it might run well. Same sketch compiled with APDE on the phone itself runs perfectly.

My phone is: Philips Xenium I908 (with FullHD display 1920x1080 and 2 GB RAM)
My pc runs: Windows 8.1 Pro x64 and Processing 3.2.1 (x64) + Android Mode 3.0.1

Processing IDE gives me this when app crashes:

java.lang.NullPointerException
at processing.core.PGraphicsAndroid2D.backgroundImpl(Unknown Source)
at processing.core.PGraphics.backgroundFromCalc(Unknown Source)
at processing.core.PGraphics.background(Unknown Source)
at processing.core.PGraphics.defaultSettings(Unknown Source)
at processing.core.PGraphics.checkSettings(Unknown Source)
at processing.core.PGraphicsAndroid2D.beginDraw(Unknown Source)
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:841)
FATAL EXCEPTION: Animation Thread
Process: processing.test.sketch_160921a, PID: 5683
java.lang.NullPointerException
at processing.core.PGraphicsAndroid2D.backgroundImpl(Unknown Source)
at processing.core.PGraphics.backgroundFromCalc(Unknown Source)
at processing.core.PGraphics.background(Unknown Source)
at processing.core.PGraphics.defaultSettings(Unknown Source)
at processing.core.PGraphics.checkSettings(Unknown Source)
at processing.core.PGraphicsAndroid2D.beginDraw(Unknown Source)
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:841)

[unrealkate]

Tested with the following simple sketch:

void setup()
{
fullScreen();
}
void draw()
{
background(50);
stroke(250);
fill(150);
ellipseMode(RADIUS);
ellipse(width / 2, height / 2, 200, 200);
}

I tried to remove a call to background() function but with no success.

[sesmusician]

try fullScreen(P2D);
fixed the problem to me,but it is slower and it looks ugly.

[brew4321]

I've been making a game and it kept crashing. (I had the same error you do, and it sometimes works, and sometimes doesn't). I started to suspect it had something to do with PVectors so I whittled the code down to the following minimal program that still gives me the error:

PVector v1;
PVector v2;
size(640,360);
v1 = new PVector(0,1);
v2 = new PVector(1,2);
v1.add(v2);

I was going to open a new issue here, but just saw yours.
Also I noticed the size function seems to be critical to the error. If I try it with out the size function the error goes away and it starts every time. Or if I use smaller numbers like size(50,50); it also goes away. Since your simple sketch has fullScreen that may be a place to start debugging...

[darioringach]

My settings() has only two lines, fullScreen(JAVA2D) and orientation(LANDSCAPE).

I noticed that adding a 1s delay after each dramatically reduced the number of instances where the program crashes with the above error (from 50% to about 2%).

[codeanticode]

@darioringach thanks for this info, sounds like could be useful to determine the cause of the crash!

[raft75]

I have the same problem on a Galaxy S3 (Android 4.4.2).
@darioringach Could you share the code you are using to mitigate the issue? I have tried with delay(1000) but it doesn't help.

[rossanag]

I am having the same problem with an LG 2 Mini Android 4.4.2 (tested on device)
Here it is the whole description:

I tested the example that is in the Processing Android page:

    import android.content.Context;
    import android.hardware.Sensor;
    import android.hardware.SensorManager;
    import android.hardware.SensorEvent;
    import android.hardware.SensorEventListener;

    Context context;
    SensorManager manager;
    Sensor sensor;
    AccelerometerListener listener;
    float ax, ay, az;

    void setup() {
      fullScreen();
      //size(displayWidth, displayHeight);
      context = getActivity();
      manager = (SensorManager)context.getSystemService(Context.SENSOR_SERVICE);
      sensor = manager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
      listener = new AccelerometerListener();
      manager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_GAME);

      textFont(createFont("Arial", 60));
    }

    void draw() {
      background(0);
      text("X: " + ax, 10, 60);
      text("Y: " + ay, 10, 120);
      text("Z: " + az, 10, 180);
    }

    class AccelerometerListener implements SensorEventListener {
      public void onSensorChanged(SensorEvent event) {
        ax = event.values[0];
        ay = event.values[1];
        az = event.values[2];    
      }
      public void onAccuracyChanged(Sensor sensor, int accuracy) {
      }
    }


    public void onResume() {
      super.onResume();
      if (manager != null) {
        manager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_GAME);
      }
    }

    public void onPause() {
      super.onPause();
      if (manager != null) {
        manager.unregisterListener(listener);
      }
    }

I got the following error and the app doesn't even start:

FATAL EXCEPTION: Animation Thread

    Process: processing.test.and1, PID: 13795
    java.lang.NullPointerException
        at processing.core.PGraphicsAndroid2D.backgroundImpl(Unknown Source)
        at processing.core.PGraphics.backgroundFromCalc(Unknown Source)
        at processing.core.PGraphics.background(Unknown Source)
        at processing.core.PGraphics.defaultSettings(Unknown Source)
        at processing.core.PGraphics.checkSettings(Unknown Source)
        at processing.core.PGraphicsAndroid2D.beginDraw(Unknown Source)
        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:841)

I had to modify the code and put size(displayWidth, displayHeight); instead and it works fine.

Processing version: 3.2.3
Android Mode: 3.0.2 (installed through the IDE)
Target SDK: API 6.0 (23)
OS: Ubuntu 12.04 64 bits

Hope I could have any hint to solve this.

[rossanag]

UPDATE: When tested with Target SDK: API 7.1.1 it works fine. I will check out another examples.

[rossanag]

If I load an image: png, jpg, it doesn't work in any Target SDK I tryed.
Just work for a while if I put fullScreen into void settings(), but as soon as I change the orientation it stops, and it throws the errors described above.

[exal99]

I get exactly the same exception but only when I run my app on my Samsung taplet with API 16, Android 4.1.2. However when I run it on my phone (API 23 Android 6.0.1) everything works just fine. I also get it to work when I use P2D as the renderer but it runs painfully slow. During it's run I'm also noticing a lot of calls to the garbage collector. Is the problem that processing dose not support older android versions?

[Calsign]

Instead of P2D, it appears that using OPENGL avoids both the default renderer crash and the poor performance of P2D. See the issue APDE #24 for more information.