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Great Reads

A Journey to the World of Android Wearable

by ridoy

A brief explanation of application development for Android Wear, helpful for every beginner and intermediate android developer.

Android Services and More

by Safak Tarazan

Usage of services, alarm manager and broadcast receivers

Introducing Calcium for Xamarin.Forms

by Daniel Vaughan

Create best-in-breed cross-platform MVVM apps using Calcium for Xamarin.Forms.

Never Buy A Garage Door Remote Again: Open Your Door With Your Android Phone (via Bluetooth)

by raddevus

Steps for building a device you can add to your existing garage door, which implements an atmega328, bluetooth (hc-05) and relay module which will allow you to open your garage door from any paired Android device.

Latest Articles

Windows / Android (C#/Java) Compatible Data Encryption with Compression

by JudyL_MD

Code sample for passing encrypted compressed data between Windows and Android

Debugging Memory Leaks in Android Applications: Integrating LeakCanary with RxJava

by Ayush Vijaywargi

Enhancing Android app stability by integrating LeakCanary with RxJava for efficient memory leak detection and resolution.

Running Automation Tests At Scale Using Appium

by Suhagkumar Vamja

The article discusses the challenges faced by businesses in releasing mobile applications quickly and the importance of faster time to market (TTM)

Generate Icon Sets for Android and iOS in Native Mobile App Development

by Zijian

Use PowerShell scripts to generate icons of native mobile apps

All Articles

Android

Java.lang.nullpointerexception: attempt to invoke interface method 'int java.util.list.size()' on a null object reference

N 6 May 2024 by OriginalGriff

To add to what Pete has said ... This is one of the most common problems we get asked, and it's also the one we are least equipped to answer, but you are most equipped to answer yourself. Let me just explain what the error means: You have tried...

Java.lang.nullpointerexception: attempt to invoke interface method 'int java.util.list.size()' on a null object reference

N 6 May 2024 by Pete O'Hanlon

You check mlist to see if it's null then log this. If it's null, you have no guard around the size because you just log that there's a null entry and continue processing as per normal. Try something like this.if (mlist == null) { ...

Java.lang.nullpointerexception: attempt to invoke interface method 'int java.util.list.size()' on a null object reference

N 6 May 2024 by BHAVYA NAINESHKUMAR FULWALA

package com.example.todoapp.adapter; import android.content.Context; import android.os.Bundle; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.CheckBox;...

Data retrieval not working properly in android from sqlite database to composable function

N 1 May 2024 by maveň08

You can try: - Collect Data Properly: Instead of directly assigning the Flow to your state variables, collect the data within the LaunchedEffect block and then update the state variables accordingly. - Separate Database Operations: Move the...

Chats are not appearing on chatwindowactivity in andriod studio java using firebase

U 1 May 2024 by maveň08

Can you move this line messagesAdapter = new messagesAdapter(Chat_Window.this, messageArrayList); in onDataChange, after messageArrayList.add(messages); this line.

Internal storage video downloder

N 1 May 2024 by maveň08

You can try this way. private void downloadVideo(String videoUrl, String name, String fileExtension) { FileUtils.saveVideoToInternalStorage(requireContext(), videoUrl, name + fileExtension, success -> { if (success) { //...

Data retrieval not working properly in android from sqlite database to composable function

U 30 Apr 2024 by PauliKK

The app seems to ignore the database values and defaults to "00-00-0000" for dates and "0" for streak counts, suggesting an issue with the data collection logic or state handling in the composable function.A likely cause could be incorrect data...

Data retrieval not working properly in android from sqlite database to composable function

N 30 Apr 2024 by Everything Select

Function in my Dao file is: @Query("SELECT * from appData WHERE type = :type ORDER BY id DESC") fun getData(type: String): Flow> The database contains a column of automatically generated int primary key 'id', a column of...

Chats are not appearing on chatwindowactivity in andriod studio java using firebase

8 Apr 2024 by VortexV7

The chats/messages are not appearing on my app's chat windows but when I have checked my firebase database it is showing there properly. Here is the code please look into it. ChatWindow.java package com.vortexv.vconnect; import...

App crashing when login in to mainactivity in android studio java

6 Apr 2024 by Pete O'Hanlon

Add an empty default constructor to the class.public Users() {} The error told you exactly what the problem was.

App crashing when login in to mainactivity in android studio java

6 Apr 2024 by VortexV7

I am using firebase as my database for my app which is an chatting app. And my app is crashing whenever I try to login or sign up to my app main activity the app crashes automatically. MainActivity.java package com.vortexv.vconnect; import...

Internal storage video downloder

18 Mar 2024 by Aftab Amjad

Hi, I am trying to download a video from url and save it in the internal app storage which can be viewed in the Downloaded Fragment. The problem is that when i click the download button video starts downloading and in notification bar downloading...

Windows / Android (C#/Java) Compatible Data Encryption with Compression

13 Mar 2024 by JudyL_MD

Code sample for passing encrypted compressed data between Windows and Android

Debugging Memory Leaks in Android Applications: Integrating LeakCanary with RxJava

12 Mar 2024 by Ayush Vijaywargi

Enhancing Android app stability by integrating LeakCanary with RxJava for efficient memory leak detection and resolution.

How do I make a simple data entry application with two activities navigating among each other

8 Feb 2024 by Ayush Thakur from New Delhi

I want to make a simple data entry application where the app starts with the main activity and asks the user for their info and image URI from the gallery, after getting all the inputs when the user enters submit it opens up a new activity that...

How to create two separate android application projects in android studio?

3 Feb 2024 by Richard MacCutchan

You can create as many projects as you want in Android Studio. Just use the "New Project" menu selector.

How to create two separate android application projects in android studio?

3 Feb 2024 by 3bdelrahman

How to create another android application project in the same android studio which already have a project and an application . Is it possible to have two separate projects with two separate android applications in the same android studio? What I...

How do I launch an android app from a blazor hybrid app

26 Jan 2024 by Graeme_Grant

Make a Method in MAUI, then expose it to your Blazor Hybrid app. You call the MAUI method and that will do the native Android work for you. If you are not sure how to do this, there are plenty of examples: call maui method from a blazor hybrid...

How do I launch an android app from a blazor hybrid app

26 Jan 2024 by Martijn van der Kaaij

I'm trying to open any app on my android phone from within a blazor hybrid app (written in c#). On windows machines I can open local programs, using system.diagnostics.process.start, but I can't get it to work on Android. I have tried to start...

How do I install libgbm_mesa library in my AOSP project?

14 Jan 2024 by Tushar Sondhi

I am getting the error saying "libgbm_mesa_wrapper (SHARED_LIBRARIES) android-x86" missing libgbm_mesa (SHARED_LIBRARIES android-x86)" in my AOSP project while I am trying to build it for x86 platform. I did try to set...

Why does my application crashes when it connects to the database after clicking the button "bt_inscription_main"

25 Dec 2023 by eva joly fabiola yepgwa takedo

Logs : KeyboardViewController.show():438 Requesting to show sub view with id 2131428318(key_pos_password_header_numbers) which doesn't exist in current keyboard view ...

Why does my application crashes when it connects to the database after clicking the button "bt_inscription_main"

25 Dec 2023 by Dave Kreskowiak

Without the error message printed to the console window by the e.printStackTrace method in your trry/catch block, it's impossible for anyone to tell you what's going wrong.

Why does my application crashes when it connects to the database after clicking the button "bt_inscription_main"

25 Dec 2023 by eva joly fabiola yepgwa takedo

When i click the button to save user's informations, the app just close and i can't access the database to see if the infos got saved or not because of that. When i comment the "verifyUser(mail)" part, i only get the toast as an answer but the...

How do I ensure I properly get text alerts on my android phone?

24 Dec 2023 by Richard MacCutchan

This is not a programming issue; you should contact Facebook for help

How do I ensure I properly get text alerts on my android phone?

24 Dec 2023 by Xarzu

I had given up on Facebook. Someone managed to use its system against me be making multiple request to reset my password. So I eventually decided to live without it. But I begrudgingly found that Facebook can be a useful tool to make contact...

Final Year Project Advice

18 Dec 2023 by pasztorpisti

Have some balls and don't be afraid to choose your destiny for yourself. Do you want us to tell you what to do with your life??? (Hmmm, a few tips from me: go and try working as a makeup artist or a ballet dancer...) If you have no clue about any...

artificial-intelligence

Running Automation Tests At Scale Using Appium

11 Dec 2023 by Suhagkumar Vamja

The article discusses the challenges faced by businesses in releasing mobile applications quickly and the importance of faster time to market (TTM)

Generate Icon Sets for Android and iOS in Native Mobile App Development

13 Nov 2023 by Zijian

Use PowerShell scripts to generate icons of native mobile apps

ERROR:"the option setting 'android.experimental.testoptions.emulatorsnapshots.maxsnapshotsfortestfailures=0' is experimental"

6 Nov 2023 by Yago Rodríguez

I have encountered this problem in my androidstudio application. I've checked my build.gradle and I don't have the maxSnapshotsForTestFailures added. I've searched the entire application and I haven't added what the compiler says I have. What I...

Scrape data and send updates in android

5 Nov 2023 by Navi_here

So there is a website which contains some information. I am building an Android app that will show some specific information of that website and whenever the website gets some update, my app will automatically receive a notification about that...