Develop Reference

Flutter HEALTH package get steps from user returns always null?

I am working on a personal project and I am using flutter to develop an app (cross platform) that reads in the user's health data from google fit (Android) or Apple Health. I am using this package and even the EXACT same code like in the documentation (I am currently only testing on Android):
Future fetchStepData() async {
int? steps;
// get steps for today (i.e., since midnight)
final now = DateTime.now();
final midnight = DateTime(now.year, now.month, now.day);
bool requested = await health.requestAuthorization([HealthDataType.STEPS]);
if (requested) {
try {
steps = await health.getTotalStepsInInterval(midnight, now);
} catch (error) {
print("Caught exception in getTotalStepsInInterval: $error");
}
print('Total number of steps: $steps');
setState(() {
_nofSteps = (steps == null) ? 0 : steps;
_state = (steps == null) ? AppState.NO_DATA : AppState.STEPS_READY;
});
} else {
print("Authorization not granted - error in authorization");
setState(() => _state = AppState.DATA_NOT_FETCHED);
}
}
Then I am calling this function with await and I also have inserted the correct permission in all Android Manifest files:
Also I set up an OAuth2 Client ID for the project and added my google account as a test user.
BUT THE FUNCTION SETS THE VARIABLE STEPS ALWAYS TO NULL? The boolean variable "requested" is true, so it seems like the actual connection is working?
I am really disappointed by myself guys and I really need help - THANK YOU!
I tried adding the correct android permissions, asking for permissions explicitly, different time intervalls but nothing worked for me, I always got a null value back.

Accessibility Identifier issue in ReactNative

I am setting accessibility identifier for my components in react native using testID in iOS and accessibilityLabel in android. For iOS is working fine but for Android it my identifier is appended with , (a comma and a space). I am not sure what is causing issue. Here is my code:
const renderAccessibilityLabel = (str) => {
const propsForAutomation = {};
if (Platform.OS === "ios") {
propsForAutomation.testID = str;
} else {
propsForAutomation.accessibilityLabel = str;
}
return propsForAutomation;
};
// Inside render method:
<Text {...renderAccessibilityLabel("MyText")}>{MyText}</Text>
result > ios: MyText
android: MyText,
I don't know whats wrong with code :(

There was a bug with react native that was fixed in 0.60.5.
My guess is you are using an earlier version (0.60), updating will correct this.
Problem occurs in ReactAndroid/src/main/java/com/facebook/react/uimanager/BaseViewManager.java
Line 178 contentDescription.append(accessibilityLabel + ", ");
Just in case you can't update for any reason, it can be fixed by adding contentDescription = contentDescription.replaceAll(", $", ""); just above the line if (contentDescription.length() > 0) {
Or by replacing the file with the changes in https://github.com/facebook/react-native/commit/812abfd.

Got 'One of the sources for assign has an enumerable key on the prototype chain' on React native app

I am using react-native for Android app. And use axios as http library. When I try to send a Blob object through http post I will get below error:
HTTP Failure in Axios TypeError: One of the sources for assign has an enumerable key on the prototype chain. Are you trying to assign a prototype property? We don't allow it, as this is an edge case that we do not support. This error is a performance optimization and not spec compliant.
Below is the code I used to add blob object on form data:
let data = new FormData()
data.append('image', decodeBase64Image(image));
below is the code to decode base64 image. And below code works fine in one of my website application.
export const decodeBase64Image = (dataURI) => {
let byteString;
if (dataURI === undefined) {
return undefined
}
if (dataURI.split(',')[0].indexOf('base64') >= 0)
byteString = atob(dataURI.split(',')[1]);
else
byteString = unescape(dataURI.split(',')[1]);
// separate out the mime component
let mimeString = ''
if (dataURI.split(',')[0] != undefined && dataURI.split(',')[0].split(':')[1] != undefined) {
mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]
}
// write the bytes of the string to a typed array
let ia = new Uint8Array(byteString.length);
for (let i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
return new Blob([ia], {type: mimeString});
}

The root of the problem is that the React Native devs made a performance optimization that is not spec-compliant (which is why the code works on your website, but not your React Native app). For more details, see the issue I opened here: https://github.com/facebook/react-native/issues/16814
As a workaround, you can use react-native-fetch-blob. I ran into the same error you did, and react-native-fetch-blob solved it for me.

Cordova/jQuery - Identifying whether your app is being run on Web/Mobile browser or mobile app (Android/iOS)

I develop apps for Android/iOS using Cordova/Phonegap. I generally use a single code base for my web and mobile content. I use a SQLite database and/or other native plugins when it is a mobile app and have to avoid those LOCs when I'm on web.
But I'm facing a problem identifying whether my app is being run on a web browser on Desktop/Mac/Android/iOS or as a mobile app (Android/iOS).
I have tried userAgent sniffing, but this regex technique fails especially when running the code on mobile browsers. Following is the code I used to identify OS and version of the device:
getOSAndVersion: function() {
var that = this;
var userOS; // will either be iOS, Android or unknown
var userOSver; // this is a string, used to denote OS version
var ua = navigator.userAgent;
var uaindex;
if (/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(ua)) {
window.deviceType = "Mobile";
} else {
window.deviceType = "Web";
}
// determine OS
if (ua.match(/iPad/i) || ua.match(/iPhone/i)) {
userOS = 'iOS';
uaindex = ua.indexOf('OS ');
}
else if (ua.match(/Android/i)) {
userOS = 'Android';
uaindex = ua.indexOf('Android ');
}
else {
userOS = 'unknown';
}
// determine version
if (userOS === 'iOS' && uaindex > -1) {
userOSver = ua.substr(uaindex + 3, 3).replace('_', '.');
}
else if (userOS === 'Android' && uaindex > -1) {
userOSver = ua.substr(uaindex + 8, 3);
}
else {
userOSver = 'unknown';
}
return { osVersion: userOSver, os: userOS, deviceType: window.deviceType };
}
Is there any other technique I can use to reliably identify where my code is being run?
P.S. : I'm averse to using any other Cordova/JS plugin to identify it but still open for discussion.

In Cordova when app is runing into app the url is prefixed by file:// and when running in mobile browser the url is prefixed with http or https protocal.
Solution :
Get url of you current page (check this)
Identify its prefix if file:// the its app
If http or https then mobile browser

You could just check if cordova is defined?
if (cordova) {
// Running in your app
} else {
// Not running in your app, so website
}

rotate3D of CSS3 transform is not working in Android

I've created one App using Phonegap and HTML5 (jqueryMobile). I've put rotate3D for one div,
it is working fine in google chrome and Safari, but it is not working in Android 2.3+
Any suggestion?

I think It is a bug of android browser. I make a function to test if rotate3d is supported and it says Yes:
function styleSupport( prop )
{
var vendorProp;
var supportedProp;
// capitalize first character of the prop to test vendor prefix
var capProp = prop.charAt(0).toUpperCase() + prop.slice(1);
var prefixes = [ "Moz", "Webkit", "O", "ms" ];
var div = document.createElement( "div" );
if ( prop in div.style )
{
//browser supports standard CSS property name
supportedProp = prop;
}
else
{
//otherwise test support for vendor-prefixed property names
for ( var i = 0; i < prefixes.length; i++ )
{
vendorProp = prefixes[i] + capProp;
if ( vendorProp in div.style )
{
supportedProp = vendorProp;
break;
}
}
}
// avoid memory leak in IE
div = null;
return supportedProp;
}
alert(styleSupport('perspective'));
alert(styleSupport('transform'));

As you can see her, CSS transforms3D are not supported by Android 2.3 :
http://caniuse.com/#feat=transforms3d
try to upgrade to Android 4 (it works for me)