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Why is my Android app crashing every time I run a python script with chaquopy?

I am building an Android app that will allow the user to get a picture either by taking it in real time or uploading it from their saved images. Then, it will go through a machine learning script in python to determine their location. Before I completely connect to the algorithm, I am trying a test program that just returns a double.
from os.path import dirname, join
import csv
import random
filename = join(dirname(__file__), "new.csv")
def testlat():
return 30.0
def testlong():
return 30.0
These returned values are used in a Kotlin file that will then send those values to the Google Maps activity on the app for the location to be plotted.
class MainActivity : AppCompatActivity() {
var lat = 0.0
var long = 0.0
var dynamic = false
private val cameraRequest = 1888
lateinit var imageView: ImageView
lateinit var button: Button
private val pickImage = 100
private var imageUri: Uri? = null
var active = false
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// Accesses the info image button
val clickMe = findViewById<ImageButton>(R.id.imageButton)
// Runs this function when the info icon is pressed by the user
// It will display the text in the variable infoText
clickMe.setOnClickListener {
Toast.makeText(this, infoText, Toast.LENGTH_LONG).show()
}
if (ContextCompat.checkSelfPermission(applicationContext, Manifest.permission.CAMERA)
== PackageManager.PERMISSION_DENIED) {
ActivityCompat.requestPermissions(
this,
arrayOf(Manifest.permission.CAMERA),
cameraRequest
)
}
imageView = findViewById(R.id.imageView)
val photoButton: Button = findViewById(R.id.button2)
photoButton.setOnClickListener {
val cameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
startActivityForResult(cameraIntent, cameraRequest)
dynamic = true
}
/*
The below will move to external photo storage once button2 is clicked
*/
button = findViewById(R.id.button)
button.setOnClickListener {
val gallery = Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI)
startActivityForResult(gallery, pickImage)
}
// PYTHON HERE
if (! Python.isStarted()) {
Python.start(AndroidPlatform(this))
}
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (resultCode == RESULT_OK && requestCode == pickImage) {
imageUri = data?.data
imageView.setImageURI(imageUri)
// PYTHON HERE
val py = Python.getInstance()
val pyobj = py.getModule("main")
this.lat = pyobj.callAttr("testlat").toDouble()
this.long = pyobj.callAttr("testlong").toDouble()
/* Open the map after image has been received from user
This will be changed later to instead call the external object recognition/pathfinding
scripts and then pull up the map after those finish running
*/
val mapsIntent = Intent(this, MapsActivity::class.java)
startActivity(mapsIntent)
}
}
}
I set up chaquopy and the gradle is building successfully, but everytime I get to the python part of emulating the app, it crashes. I'm not quite sure why that is; I thought maybe the program was too much for the phone to handle but it is a very basic python script so I doubt that's the issue.

If your app crashes, you can find the stack trace in the Logcat.
In this case, it's probably caused by the line return = 30.0. The correct syntax is return 30.0.

Python InDesign scripting: Get overflowing textbox from preflight for automatic resizing

Thanks to this great answer I was able to figure out how to run a preflight check for my documents using Python and the InDesign script API. Now I wanted to work on automatically adjusting the text size of the overflowing text boxes, but was unable to figure out how to retrieve a TextBox object from the Preflight object.
I referred to the API specification, but all the properties only seem to yield strings which do not uniquely define the TextBoxes, like in this example:
Errors Found (1):
Text Frame (R=2)
Is there any way to retrieve the violating objects from the Preflight, in order to operate on them later on? I'd be very thankful for additional input on this matter, as I am stuck!

If all you need is to find and to fix the overset errors I'd propose this solution:
Here is the simple Extendscript to fix the text overset error. It decreases the font size in the all overflowed text frames in active document:
var doc = app.activeDocument;
var frames = doc.textFrames.everyItem().getElements();
var f = frames.length
while(f--) {
var frame = frames[f];
if (frame.overflows) resize_font(frame)
}
function resize_font(frame) {
app.scriptPreferences.enableRedraw = false;
while (frame.overflows) {
var texts = frame.parentStory.texts.everyItem().getElements();
var t = texts.length;
while(t--) {
var characters = texts[t].characters.everyItem().getElements();
var c = characters.length;
while (c--) characters[c].pointSize = characters[c].pointSize * .99;
}
}
app.scriptPreferences.enableRedraw = true;
}
You can save it in any folder and run it by the Python script:
import win32com.client
app = win32com.client.Dispatch('InDesign.Application.CS6')
doc = app.Open(r'd:\temp\test.indd')
profile = app.PreflightProfiles.Item('Stackoverflow Profile')
print('Profile name:', profile.name)
process = app.PreflightProcesses.Add(doc, profile)
process.WaitForProcess()
errors = process.processResults
print('Errors:', errors)
if errors[:4] != 'None':
script = r'd:\temp\fix_overset.jsx' # <-- here is the script to fix overset
print('Run script', script)
app.DoScript(script, 1246973031) # run the jsx script
# 1246973031 --> ScriptLanguage.JAVASCRIPT
# https://www.indesignjs.de/extendscriptAPI/indesign-latest/#ScriptLanguage.html
process = app.PreflightProcesses.Add(doc, profile)
process.WaitForProcess()
errors = process.processResults
print('Errors:', errors) # it should print 'None'
if errors[:4] == 'None':
doc.Save()
doc.Close()
input('\nDone... Press <ENTER> to close the window')

Thanks to the exellent answer of Yuri I was able solve my problem, although there are still some shortcomings.
In Python, I load my documents and check if there are any problems detected during the preflight. If so, I move on to adjusting the text frames.
myDoc = app.Open(input_file_path)
profile = app.PreflightProfiles.Item(1)
process = app.PreflightProcesses.Add(myDoc, profile)
process.WaitForProcess()
results = process.processResults
if "None" not in results:
# Fix errors
script = open("data/script.jsx")
app.DoScript(script.read(), 1246973031, variables.resize_array)
process.WaitForProcess()
results = process.processResults
# Check if problems were resolved
if "None" not in results:
info_fail(card.name, "Error while running preflight")
myDoc.Close(1852776480)
return FLAG_PREFLIGHT_FAIL
I load the JavaScript file stored in script.jsx, that consists of several components. I start by extracting the arguments and loading all the pages, since I want to handle them individually. I then collect all text frames on the page in an array.
var doc = app.activeDocument;
var pages = doc.pages;
var resizeGroup = arguments[0];
var condenseGroup = arguments[1];
// Loop over all available pages separately
for (var pageIndex = 0; pageIndex < pages.length; pageIndex++) {
var page = pages[pageIndex];
var pageItems = page.allPageItems;
var textFrames = [];
// Collect all TextFrames in an array
for (var pageItemIndex = 0; pageItemIndex < pageItems.length; pageItemIndex++) {
var candidate = pageItems[pageItemIndex];
if (candidate instanceof TextFrame) {
textFrames.push(candidate);
}
}
What I wanted to achieve was a setting where if one of a group of text frames was overflowing, the text size of all the text frames in this group are adjusted as well. E.g. text frame 1 overflows when set to size 8, no longer when set to size 6. Since text frame 1 is in the same group as text frame 2, both of them will be adjusted to size 6 (assuming the second frame does not overflow at this size).
In order to handle this, I pass an array containing the groups. I now check if the text frame is contained in one of these groups (which is rather tedious, I had to write my own methods since InDesign does not support modern functions like filter() as far as I am concerned...).
// Check if TextFrame overflows, if so add all TextFrames that should be the same size
for (var textFrameIndex = 0; textFrameIndex < textFrames.length; textFrameIndex++) {
var textFrame = textFrames[textFrameIndex];
// If text frame overflows, adjust it and all the frames that are supposed to be of the same size
if (textFrame.overflows) {
var foundResizeGroup = filterArrayWithString(resizeGroup, textFrame.name);
var foundCondenseGroup = filterArrayWithString(condenseGroup, textFrame.name);
var process = false;
var chosenGroup, type;
if (foundResizeGroup.length > 0) {
chosenGroup = foundResizeGroup;
type = "resize";
process = true;
} else if (foundCondenseGroup.length > 0) {
chosenGroup = foundCondenseGroup;
type = "condense";
process = true;
}
if (process) {
var foundFrames = findTextFramesFromNames(textFrames, chosenGroup);
adjustTextFrameGroup(foundFrames, type);
}
}
}
If this is the case, I adjust either the text size or the second axis of the text (which condenses the text for my variable font). This is done using the following functions:
function adjustTextFrameGroup(resizeGroup, type) {
// Check if some overflowing textboxes
if (!someOverflowing(resizeGroup)) {
return;
}
app.scriptPreferences.enableRedraw = false;
while (someOverflowing(resizeGroup)) {
for (var textFrameIndex = 0; textFrameIndex < resizeGroup.length; textFrameIndex++) {
var textFrame = resizeGroup[textFrameIndex];
if (type === "resize") decreaseFontSize(textFrame);
else if (type === "condense") condenseFont(textFrame);
else alert("Unknown operation");
}
}
app.scriptPreferences.enableRedraw = true;
}
function someOverflowing(textFrames) {
for (var textFrameIndex = 0; textFrameIndex < textFrames.length; textFrameIndex++) {
var textFrame = textFrames[textFrameIndex];
if (textFrame.overflows) {
return true;
}
}
return false;
}
function decreaseFontSize(frame) {
var texts = frame.parentStory.texts.everyItem().getElements();
for (var textIndex = 0; textIndex < texts.length; textIndex++) {
var characters = texts[textIndex].characters.everyItem().getElements();
for (var characterIndex = 0; characterIndex < characters.length; characterIndex++) {
characters[characterIndex].pointSize = characters[characterIndex].pointSize - 0.25;
}
}
}
function condenseFont(frame) {
var texts = frame.parentStory.texts.everyItem().getElements();
for (var textIndex = 0; textIndex < texts.length; textIndex++) {
var characters = texts[textIndex].characters.everyItem().getElements();
for (var characterIndex = 0; characterIndex < characters.length; characterIndex++) {
characters[characterIndex].setNthDesignAxis(1, characters[characterIndex].designAxes[1] - 5)
}
}
}
I know that this code can be improved upon (and am open to feedback), for example if a group consists of multiple text frames, the procedure will run for all of them, even though it need only be run once. I was getting pretty frustrated with the old JavaScript, and the impact is negligible. The rest of the functions are also only helper functions, which I'd like to replace with more modern version. Sadly and as already stated, I think that they are simply not available.
Thanks once again to Yuri, who helped me immensely!

How to place the nodes of a graph using pyVis following the coordinate system (latitude and longitude)?

I am using the python libraries pyVis and Networkx to visualise graphs where each node is a port somewhere in the world and each link is a route between ports. The situation is as follows: with pyVis I can tell it the positions of the nodes (x and y) but when I use the longitude and latitude of the ports it doesn't place them properly, I guess it's because I'm using coordinates in an HTML page without any processing. My question is: can I use some pyVis method to tell it that the positions are coordinates and therefore change the reference system of the HTML page or do I have to write the code to do it?
Thank you, I leave the code in case it can help you.
def create_display_attributes(attr: dict, edge: bool = False) -> dict:
if not edge:
return {
'title': attr['country'],
'group': attr['region'],
'x': attr['pos'][0], #lon
'y': attr['pos'][1] #lat
}
else:
return {
'color': color_edges[attr['year']]
}
def create_display_network(graph: nx.MultiDiGraph) -> nx.MultiDiGraph:
nx_graph = nx.MultiDiGraph()
nx_graph.add_nodes_from(
[
(node, create_display_attributes(attr))
for node, attr in graph.nodes(data=True)
]
)
nx_graph.add_edges_from(
[
(source, target, create_display_attributes(attr, edge=True))
for source, target, attr in graph.edges(data=True)
if source != target
]
)
return nx_graph
def draw_graph(graph: nx.MultiDiGraph, title):
nt = Network(height="100%", width="100%", directed=True, heading=title)
nt.from_nx(create_display_network(graph))
nt.show('nx.html')

Reducing Noise in iPad Accelerometer

I'm collecting data from the iPad's accelerometer in only one direction, and it comes out quite noisy. I have looked around for noise reducing filters, but haven't found one that I understood (case in point, the Kalman filter). I guess I have two questions, is there actual significant noise associated with the accelerometer, as it appears, and if so how can I reduce it? Even if you have a link to a noise filter with an explanation I would be very grateful.
My app itself is written in swift, and my data analysis is written in python, if that matters.

I've used some simple easing that smoothes out any spikes in the values. It'll add a bit of latency, but you can determine the balance of latency vs. smoothness to suit your application by adjusting the easing property.
import UIKit
import CoreMotion
class MyViewController: UIViewController {
var displayLink: CADisplayLink?
let motionQueue = NSOperationQueue()
var acceleration = CMAcceleration()
var smoothAcceleration = CMAcceleration() {
didSet {
// Update whatever needs acceleration data
}
}
var easing: Double = 10.0
override func viewDidLoad() {
super.viewDidLoad()
self.displayLink = CADisplayLink(target: self, selector: "updateDisplay:" )
self.displayLink?.addToRunLoop( NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode )
var coreMotionManager = CMMotionManager()
coreMotionManager.startAccelerometerUpdatesToQueue( self.motionQueue ) { (data: CMAccelerometerData!, error: NSError!) in
self.acceleration = data.acceleration
}
}
func updateDisplay( displayLink: CADisplayLink ) {
var newAcceleration = self.smoothAcceleration
newAcceleration.x += (self.acceleration.x - self.smoothAcceleration.x) / self.easing
newAcceleration.y += (self.acceleration.y - self.smoothAcceleration.y) / self.easing
newAcceleration.z += (self.acceleration.z - self.smoothAcceleration.z) / self.easing
self.smoothAcceleration = newAcceleration
}
}

Django - How to display Scientific Notation on Admin Page Field?

I have a field in my admin page that I'd like to display in Scientific Notation.
Right now it displays something ugly like this. How can I display this as 4.08E+13?
Right now I'm using a standard Decimal field in the model.
Any advice is greatly appreciated.
I'm on Django 1.2.

You have to use %e to get the scientific notation format:
Basic Example:
x = 374.534
print("%e" % x)
# 3.745340e+02
Precision of 2
x = 374.534
print("{0:.2E}".format(x))
# 3.75E+02
x = 12345678901234567890.534
print("{0:.2E}".format(x))
# 1.23E+19
Precision of 3
print("{0:.3E}".format(x))
# 1.235E+19

Well, here's a work around since I can't figure out how to do this within the Django Python code. I have the admin pages run some custom javascript to do the conversion after the page is loaded.
Details:
Create this javascript file called "decimal_to_sci_not.js" and place it in your media directory:
/*
Finds and converts decimal fields > N into scientific notation.
*/
THRESHOLD = 100000;
PRECISION = 3;
function convert(val) {
// ex. 100000 -> 1.00e+5
return parseFloat(val).toPrecision(PRECISION);
}
function convert_input_fields() {
var f_inputs = django.jQuery('input');
f_inputs.each(function (index, domEl) {
var jEl = django.jQuery(this);
var old_val = parseFloat(jEl.val());
if (old_val >= THRESHOLD) {
jEl.val(convert(old_val));
}
});
}
function convert_table_cells() {
//Look through all td elements and replace the first n.n number found inside
//if greater than or equal to THRESHOLD
var cells = django.jQuery('td');
var re_num = /\d+\.\d+/m; //match any numbers w decimal
cells.each(function (index, domEl) {
var jEl = django.jQuery(this);
var old_val_str = jEl.html().match(re_num);
var old_val = parseFloat(old_val_str);
if (old_val >= THRESHOLD) {
jEl.html(jEl.html().replace(old_val_str,convert(old_val)));
}
});
}
django.jQuery(document).ready( function () {
convert_input_fields();
convert_table_cells();
});
Then update your admin.py code classes to include the javascript file:
class MyModel1Admin(admin.ModelAdmin):
class Media:
js = ['/media/decimal_to_sci_not.js']
admin.site.register(MyModel1,MyModel1Admin)