I'm trying to learn more about Android development, and I think I have hit a tough patch. Basically, I want to be able to send a "fake" key-press to the entire android system. For example, lets say I have my music player going and I want to pause the music. I should be able to send:
KeyEvent eventPause = new KeyEvent(KeyEvent.KEYCODE_MEDIA_PAUSE, KeyEvent.KEYCODE_BACK);
System wide so it will stop/pause what ever media event is playing. The problem is, I keep finding things online about an instrumentation class, and some other weird classes that I either will have trouble compiling or has been taken out of the android API.
Does anyone know a way I can do this? I have a rooted phone, so a solution that requires root is perfectly fine for me.
Thanks!
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First of all, I am extremely new to coding and I just learned the basics of java. I want to do an android app as my first project. The idea of the app would be to have buttons on your phone which would work as keyboard macros. I was wondering if I also needed to create specific windows drivers for it or if I could just make it run on the default windows keyboard drivers? As I said I am super new to all of this (about 10hrs of programming experience), so feel free to correct me and educate me as much as you want! I won't take it personally, I'm looking to learn :)
You would need to set up some sort of communication between the app and your PC. You wouldn't need to do anything with the keyboard drivers. Java has something called the "Robot class" which allows you to simulate a keypress.
Here is the documentation on the robot class: https://docs.oracle.com/javase/7/docs/api/java/awt/Robot.html
As for the communications, you will need to create a server/client connection. One of your devices will act as the client (probably your phone) and one will act as the server (probably your PC).
This is just a rough idea of how it would work but:
When you tap the button on your phone, it would send some specified data to your server that is running on your PC. You should set the data that gets sent from the client to the server as the key(s) keycode that you would like it to simulate so it will be easier to implement. When the server gets data from the client, it should send that data to the robot.keypress(data) function.
This honestly sounds like it will be a big project for your skill level but I wish you the best of luck on this. This will probably be a frustrating experience but don't let it get the better of you.
I would like to create a Java program that does simple things to a MIDI device, in this case the Novation Launchpad MK2. It is a grid of 8x8 buttons that can light up. I don't have any experience with using MIDI in Java, and I don't know where to start.
The basic idea is that I want buttons to light up for example when I press them. This means I want to send note and velocity data to the device, but also that pressing a button on the device should send a command to my program. There is documentation on the device on the website of Novation: https://customer.novationmusic.com/support/product-downloads?product=Launchpad.
Is this idea possible, or would it be harder than I imagine it to be? My experience with Java (or programming as a whole) is fairly limited, but I know a good portion of the basics. Anyone an idea on how to do this, how complicated this is and perhaps someone can give me a basic idea how I should go about doing this?
Java have API for your needs. Just learn it.
https://docs.oracle.com/javase/tutorial/sound/accessing-MIDI.html
I'm going to build a music player working on both Android and Desktops. It won't be anything special, I'm doing it more to training myself and know more or less what problems I might encounter if I want to do a real app/program one day. Therefore, since I'm already rather decent at web technologies, I'll try to use something else: Java.
My app / program with have to
be able to read music files and play them (I'm planning on reading the files myself, meaning that I only need to be able to read "raw" sound, WAV or such)
be able to write to music files (to change tags)
be able to communicate with another instance of the program on another device that's on the same network (I want to be able to use my phone as a remote control and my pc as a remote control for my phone)
If possible, show some play/pause buttons on the screen even if it's locked (probably just on android)
And this is where I need your help: What you I do to write as little "device specific" code as possible?
It's obvious I can reuse classes used to encode/decode some music types. Finding the files, reading them, writing them, playing raw sound and connection to the network will be easy to abstract if needed.
But then there is the UI and it looks like if I don't plan carefully, I'll have to do it twice... I've seen libGDX but they kinda insist a lot on the fact it's for games...
All I need is some way to build a simple UI (a few buttons, the cover of the albums) that'd work for both the desktop and the phone.
Should I use libGDX, the "normal" libs (*WT, Swing, neither of which seem to be "compatible" with Android) or something else?
I'd also like to request as few permissions as possible. Meaning that I'd like to have a base music player that only request access to the sd card, and then features requiring additional permissions would be added as other apps/programs or addons.
From what I understood, the only way to achieve this is to create a second app and make the user install it. I think I'll manage to make the two apps communicate (with Intent?) but is it really the only solution?
Thank you in advance for your answers.
Maybe you could consider building the app with something such as Phonegap: http://phonegap.com/ This would let you use your web technologies strength and write a very slim layer of device specific code if any at all!
As for getting a phonegap app to run on the desktop....you could use something like :http://ripple.incubator.apache.org/ to have it run on the desktop. I know this is slightly different and you wanted to tackle writing something in Java - however this is the way mobile development is moving so you may want to get started like this!
i'm doin my project in 8th sem telecomm engineering, and i'm plannin to create a DUPLEX(not confident whether it'd be full or half) communication app using bluetooth and wifi as channels,something more advanced than a simple walkie talkie, and i was wondering if this is possible for a one man army??? also i was wondering if it is possible to do so with android versions 2.2 and above... can i just program the bluetooth settings in app in such a way, that, it doesn't pop up for user permission to accept a voice message from the calling party??
and is there a possibility for creating multiple channels(one for Forward Voice Channel and one for Reverse Voice Channel) using bluetooth or wifi?? here's a list of few knowledge i possess:
JAVA: basics, done some gui in desktops, know some imp classes,only SE6...
WIRELESS COMMUNICATION: learning it this semester, stuff like how base station accepts incoming mobile station request and redirects it to dest, mostly 1g in our portions...
OPERATING SYSTEMS: general, looking forward to learning android and linux os...
C,C++,DSP,and SOME ELECTRONICS...
oh, and iwoul like to implement these well within 7 months duration...
people please ENLIGTHEN me with your wisdom and references to useful websites ASAP...
my THANKS AND WISHES to thee...:)
The first big problem i see is that on using wifi for this, and as i understood it is some sort of (advanced) walkie-talkie app with no rooter inbetween the communicating phones, you have to implement adhoc-wlan on your android device, which is not supported by android, so you will need a rooted device for that, and the implementation of adhoc-wlan on android is definitve possible (have a look at this code: http://code.google.com/p/android-wifi-tether/) but nothing easy (i have done it myself for an university project).
And you asked if you can avoid the permission pop-up for an incoming message, but on an android phone activating your bluetooth or pairing it with an other device will always ask for permission from the user.
I cant help about the multiple channels you were asking for.
As Answer to your big Question: "is it possible for a one man army?" i would say generelly yes, but it depends on how much other stuff you have to do. Since you were writing this is an project for university, i dont know if this is your only project and you can invest a lot of time in it. If so i guess it is possible, but it will be an quite big project and you should be willing to work yourself relativly deep into networking stuff.
On google.Code you can find some projects similar (at least the wifi part) to what you think about to do, take a look at them...
I'm looking to build a companion photo capture app for my photo capture website. I was planning to do this with phone gap.
Upon triggering the camera I want to grab a frame (a still, really) up to five times a second and send it to the server (barring any surprises, The sending part should already be dealt with in code I have). I suppose the realtime video from the camera itself should be displayed to the user as well, though I could just use the stop motion frames for that part.
Unfortunately, according to the phone gap docs, one can only launch the phone's cam app, manually take a picture, then return the user to the app.
I am looking into plugins, but I don't see any massive phonegap plugin repository out there, so I am not sure where to begin. I am just rambling now, so here is a list of bulleted questions:
Is there a plugin out there that does something like this already?
Is there a giant repository of phone gap plugins that I am too foolish to find?
If I try to roll my own java plugin (this is for an android app), what am I really getting myself into? Will I need to know enough to just make the damned thing native? I am pretty exclusively in the JS world at the moment, and am trying to get this out the door asap.
Am I missing something and there is a way to to this with vanilla phone gap?
Any other suggestions?
Thanks!
The phonegap plugins are here:
https://github.com/phonegap/phonegap-plugins