Question

I know this question has been asked quite often, but this seems to be different. I’ve tried 6 solutions from StackOverflow and it didn’t work. I’m trying to put the drawing someone made into a Notification.BigPictureStyle when they leave the app.

    public void surfaceCreated(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        _thread.setRunning(true);
        _thread.start();            
        setDrawingCacheEnabled(true);
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        _thread.setRunning(false);

        measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
        layout(0, 0, getMeasuredWidth(), getMeasuredHeight());

        buildDrawingCache(false);
        Bitmap currentState = Bitmap.createBitmap(getDrawingCache());
        setDrawingCacheEnabled(false);

        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        Intent notificationIntent = new Intent(DrawActivity.this, DrawActivity.class);
        PendingIntent contentIntent = PendingIntent.getActivity(DrawActivity.this, 0, notificationIntent, Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);

        Notification noti = new Notification.BigPictureStyle(
                new Notification.Builder(DrawActivity.this)
                    .setContentTitle("Your drawing")
                    .setContentText("Unfold to see drawing")
                    .setWhen(System.currentTimeMillis())
                    .setSmallIcon(R.drawable.ic_launcher)
                    .setContentIntent(contentIntent))
        .setSummaryText("Here you can see how you left your drawing.")
        .bigPicture(currentState)
        .build();

        manager.notify(1023, noti);

    }
}

But I always get a NullPointerException at this line:

Bitmap currentState = Bitmap.createBitmap(getDrawingCache());

This code is from StackOverflow with enabling all these caches. Can someone see what’s wrong?

By the way, I’m using Android 4.1.1 of course.

Answer 1

Similar question here more info here…

Problem appears to be that you can’t access contents of a surfaceview – apparently you can capture the contents of an ImageView… I assume your using a surfaceView and thus encountering the same problem… If your willing to dig further this might help (from one of the above threads/topics)

If your not using a surfaceview then setLayerType might be your answer…