Posts by Mateus Carvalho • 1,494 points
82 posts
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viewsQ: Background Service being killed on android
We created a GPS monitoring application, every 30 seconds or so the application updates the user’s position on the server. With the recent changes of Android 8 and following, we saw that the issue…
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answers99
viewsQ: Notifications on Android stop after downtime in the app
We use both notifications from Onesignal as in the Firebase to notify our app service providers of new requests to be met in real time. We noticed that it even happens that the app running with a…
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answer57
viewsQ: Client-Server between APP trackeia real-time location
Hello, we have an app that sends every 15 seconds the location of users to the server. Currently it is a simple POST from (lat/lng) in the API, there would be another better way to do this? Some…
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answer42
viewsQ: Changing button color dynamically on Android
I have a menu, with 3 buttons, and I need to change their color dynamically in code. I’m currently doing it this way: mDrawable.setColorFilter (0xff0099cc, PorterDuff.Mode.SRC_IN); What happens is…
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answers963
viewsQ: Run HTTP POST asynchronously in JAVA
I have a method that sends a POST to the server, how can I send multiple requests asynchronously? public void sendPost (Object content) { ObjectMapper mapper = new ObjectMapper();…
javaasked Mateus Carvalho 1,494 -
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answer127
viewsQ: Manage android library versions
Currently in my application I have the following imports library in my build.gradle: compile 'com.google.android.gms:play-services-maps:+' compile 'com.google.android.gms:play-services-gcm:+'…
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answer78
viewsQ: Restricted access to files with Git
I’m recruiting new developers to work on a PHP project, and there’s a configuration file that contains all the keys to my clients' databases. How can I make this new developer only have access to…
phpasked Mateus Carvalho 1,494 -
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answers156
viewsQ: Algorithm simulation of taximeter
I’m creating a Javascript algorithm to make the calculation similar to that of a taximeter, where you have the time of flag 1 and of flag 2. function test(hora,bandeira1, bandeira2) { if (hora >=…
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answers490
viewsQ: Prevent button to be clicked twice on android
I have a delivery app, where when clicking the button a request is triggered, it turns out that there is a bug that even with a preventive code to enter, sometimes it happens that in thousandths of…
androidasked Mateus Carvalho 1,494 -
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answer219
viewsQ: Convert day of week number to Day string
I need to convert the number that corresponds to the day of the week in String of the day in Java. Ex: 0 => Monday 1 => Tuesday
javaasked Mateus Carvalho 1,494 -
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answer1847
viewsQ: Display Popup when you realize the user will leave the page
I am willing to display a Popup to display a form to capture the email and the name of the user who is accessing the site at the time he is close to leaving the site. I see this commonly on several…
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answers512
viewsQ: JSON to XLS in java
Is it possible to turn a JSON into XLS with java? I’ve done an algorithm that writes JSON to CSV, but not XLS. If you can post libraries or examples.
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answer37
viewsQ: Map tables to save access history
I have an application, in which I need to save at least once on the day, the date and time that user accessed the application/ system. Because we charge at the end of the month for the number of…
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answers97
viewsQ: Best practice for deleted data
I am in doubt as to how best to deal with deleted data. In the system should appear to the client the option, "delete given", but the fact that deletion of this data would have to erase several…
databaseasked Mateus Carvalho 1,494 -
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answer204
viewsQ: Set Timezone for all Datetime returned from server
I’m using a backend, which returns me a DateTime by default UTC, I used the function date_default_timezone_set to set the Timezone of São Paulo, but this worked only for the hours of my local…
phpasked Mateus Carvalho 1,494 -
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answer29
viewsQ: Restart service when killed by system automatically
I am using a Service to perform a task in the background, when I starto it by startService() and I put it in the way onStartCommand() return START_STICKY; it reboots whenever the system forces the…
androidasked Mateus Carvalho 1,494 -
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answers1049
viewsQ: Calculate distance traveled on android
I developed an application that one of the features it has is to calculate the distance traveled by the user, for this I use a Service and the API LocationListener to request user location updates.…
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answers363
viewsQ: Alternatives to Google Maps
I recently learned that for applications that track users (e.g., taxi apps), Google maps charges an annual license to use its API. I would like to know if there are other map API alternatives for…
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answer67
viewsQ: Update Listview item after Callback
In my application, I use the SDK of Parse.com. The SDK provides a method for loading API objects assíncrona and in another thread called fetchInBackground(). Within the getView() of my adapter…
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answer628
viewsQ: How to prevent a new instance of Activity from being created every Intent
In my application I have a BroadCastwho receives push notifications in background, that pushcurrently opens an Activity with the information of a request to be accepted, what happens is that if at…
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viewsQ: Difference of null and another proposition using this null object
If I have a code, for example: if(window!=null && window.isOpen()){ //todo } If window for null, Will he still try to call the second proposition or not check anymore? Because if he tries to…
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answer106
viewsQ: Resume to last Activity even when the app is forced to close by the user
I have an app similar to taxi apps. It happens that in the driver’s app while he is moving to pick up the passenger, if he forcibly closes the app or the device restarts or gives some crash, when he…
androidasked Mateus Carvalho 1,494 -
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answer58
viewsQ: How to stay 'listening' to see if SMS arrived on Android
I am implementing a Two-Factor Authentication service where I use a gateway for sending user registration validation codes. I want to implement an automatic check on android to check if the message…
androidasked Mateus Carvalho 1,494 -
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answers296
viewsQ: What is the best way to hide API Keys?
When you’re sharing a repository and don’t want the person to have access to the key of some API, what’s the best way to hide?
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answer335
viewsQ: News API as a service
I would like to display random news from Brazil and the world in my app while the user is processing a request. Does anyone know any service/API that can provide me with a Json of I handle?
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answers6247
viewsQ: How to get the current date/time, independent of the device?
Well, I know that when you create an object like Date: new Date(), the time and date of the device is returned, so if I arrive at settings and change these values, then the time returned will be…
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viewsQ: Sharedprefferences cleaning automatically
I have a class that manages sharedpreferrences, I realized that when I close the application and open again, the sharedprefferences settings are restored to the default. When in fact the value…
androidasked Mateus Carvalho 1,494 -
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answer82
viewsQ: Use standard Android Activity template to switch between editing and viewing
I have a activity which serves to display the User Profile, so it lists information about this user. I want to know how does that standard already adopted by Android in Actionbar stay an icon to…
androidasked Mateus Carvalho 1,494 -
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answers617
viewsQ: Create temporary lock on the app
In the app I’m developing there is a usage policy, and if this policy is scammed I want to suspend the use of the app for 30 mins, how can I do this?
androidasked Mateus Carvalho 1,494 -
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answers8768
viewsQ: Convert float or double in real $
I have a float = 11.6 I want to convert into Brazilian currency R$ 11,60, someone knows how to do?
javaasked Mateus Carvalho 1,494 -
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answer35
viewsQ: A service can be killed by android?
I know that depending on the time that one Activity be in a state of onPause() and if the device needs to release memory it will kill this Activity. I wonder if the same happens with the service…
androidasked Mateus Carvalho 1,494 -
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answers52
viewsQ: Application does not report error to google play
When it appears that message "App stopped" usually appears a send report button, where this error will be sent to the google play developer console, but with my app is not happening this, someone…
androidasked Mateus Carvalho 1,494 -
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answers185
viewsQ: Android app restarts if it gets out of focus for a while
My app is an intermediary for a service request, e.g.: (UBER). What happens is that the main screen of the business, which is the one that the professional is moving to go find the customer,…
androidasked Mateus Carvalho 1,494 -
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answers465
viewsQ: Google Cloud Messaging push notification takes too long to deliver
I have an application similar to the taxi apps (99Tax, Easy Taxi, Uber), in it I use Google Cloud Messaging to send the alerts of new races, but sometimes the latency in the delivery of the message…
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answers7717
viewsA: Open and Close div using the same Javascript button
Rather than .click(), you can use the function .toggle() jQuery. It would look like this: $( ".hamburguer" ).toggle(function() { $(".menu").fadeIn(); }, function() { $(".menu").fadeOut(); });…
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viewsQ: How to block a user for a few hours
In my Android application, we have a policy of use of the application and if some rules are violated by the user its registration should be suspended for a few hours. I use Parse.com as a back-end…
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answer69
viewsQ: How to run videos on android
I want to run a background video as a Standby screen, hiding player controls etc.
androidasked Mateus Carvalho 1,494 -
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answer53
viewsQ: Date and Time update to check if you are online
In my android app I have a service that sends from time to time a user location and saves in another field lastUpdate the day and time that happened the update. Currently use…
androidasked Mateus Carvalho 1,494 -
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answers159
viewsQ: When should an attribute be a table or vice versa?
Example: I have an Orders table, the order has some status, new, delivered, canceled etc. When the status is canceled I will give the option of the user to tell the reason that was canceled, this…
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answer278
viewsQ: Themes, Styles and support android Library
Hello since I started working with Android development, I have always had a hard time understanding how the part of Themes, styles and libs of support Android, I always have a lot of difficulty for…
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answer352
viewsQ: Do not allow onBackPressed to run
In my application, when the user logs in if he or she presses the onBackPressed() from his smartphone the app should not return to the previous screen. When he logs in and I change Activity I set in…
androidasked Mateus Carvalho 1,494 -
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viewsQ: Track Push opened in parse
I have an application in Parse.com that sends Pushs with custom API messages to open an Activity, my Custom Receiver is like this: public class CustomReceiver extends ParsePushBroadcastReceiver {…
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answers1933
viewsQ: Authenticate by SMS
I would like to know how I can authenticate a registration by sending SMS to the user’s mobile number? And which companies provide this service.
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answers288
viewsA: How to make the content not be below the footer?
Usually I set 100% for Wrapper Ivs when you already have a parent defining the site’s wrap as your own <div class="tudo'>, then do the following: .header, .conteudo, .rodape{ float:left;…
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answers1170
viewsQ: Format Phone number in Textview - android
I have a TextView that displays the user’s phone number, I would like to display in my application a mask that leaves the phone number in the format (xx) xxxx-xxxxx. How could I do that?…
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answers9315
viewsQ: Ask if the user really wants to leave the page?
I have a page where any task occurs, only it is necessary to finish it, or all process will be lost. I would like to show an Alert, as Facebook and other sites show, asking the user if they really…
javascriptasked Mateus Carvalho 1,494 -
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answers18836
viewsA: Removing Titlebar from the android app
You can in the method onCreate() of its Activity //Remove a title bar this.requestWindowFeature(Window.FEATURE_NO_TITLE);
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viewsA: How to make a slideshow accessible to ringtones on smartphones?
The Owl Carousel is a plugin that allows you to create slides, Carousels, responsive. It works together with jQuery so it is necessary to have jQuery in your scripts.…
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viewsA: How to test if an Edittext is empty?
if(editText.getText().toString().matches("")){ ..... } The method matches() tells whether or not the string passed corresponds to a given regular expression.…
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answer92
viewsQ: How to know if a session already exists on a system?
I have an application where the user can only be logged in to a device at the same time, how can I do this restriction? I use the Parse.com service, it provides an API for data exchange between an…