[Q] guidance needed - Android Q&A, Help & Troubleshooting

XDA developers i need to create an android app which is really a complicated one.
I just need to know how to get 2 matrices(of any size) from the user who uses the app and add that two matrices and finally display it in the mobile screen.
Please help me!! I'm struggling with this...I am new to this.I know java program to this.I attached it(.txt format)

doubt
Developers, Atleast clear my doubt,
What my doubt is : I have a JAVA program.Can i implement the same java program for ANDROID App?? Or i need to make any modifications in my actual program for creating ANDROID app.

help
pls help me

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[Q] Can Somebody Help regarding porting of Apps? Please read and help if you can

I am very much intrested in Android Modding and theme development. I am working a a Theme that can change whole interface of a phone. but editing png's is not enough. I need to port some applications in order to have a more better mod. Can somebody help to teach me android app porting. Im sure with only a few instructions I can learn it easily. If you want to help me kindly reply here or PM me. Please I need your help.
Thanks in advance.
its really easy to port apps all you need it a good tool like this;
Click here to see how you can port apps
you don't have to know any programming whatsoever even a noob can use it.
thanks will try and tell. So can I port all third party apps using that? The thread says small knowledge of SDK, smali etc is required. But im totally a noob.

[Q] How to install same app twice on same device ?

Hi,
I want to install two accounts of whatsapp on my nexus ...
I edited the apk name but when I try to install the new apk ..it ask me if I want to replace the old one,,,
please help
I'm not an expert, but I think you have to change the java name in the android manifest. That's all I gots- I don't even know what that means, but hopefully it will help you focus your google searches.
Thanks for the tip,,
any extra help will be great
all my methods didn't work,,
any help please ..

[Q] Some basic questions about developing

Hi guys I am new here and I wanted to start programming apps for Android devices. I have some simple questions and I hope you can answer them:
1. In which language do I need to programm in Android Studio? Java or C? Or doesn't it matter?
2. Is there a list where you can find the special comments you need to develop for an Android because programming a programm for a PC is much different than programming an App for a Smartphone (for example a special command line for using the touchscreen)
3. Where can I find source codes from Apps which already have been published because I think looking at source codes from other Apps is the best way for learning.
Thanks in advance guys
bump
Anyone?

Android App Development

Hi...guyzz
I want to modify any existing app and want to make it for installing two or more app in one device.
But How to do?
What is actual code to make changes?
Plzzz hlep me anyone. ..
https://play.google.com/store/apps/details?id=com.gmail.heagoo.apkeditor&hl=it

need help in apk development

Is there any tool to create an apk. I'm from commerce background and have no idea about coding and stuff. I have complete Beethoven Symphonies and want to create an apk that can play only Symphonies. Please any help is appreciated.. TIA

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