I am a Computer Science undergraduate student and I am creating an Android app that using an API to interact with an execution server.
The server takes a xml file and do various stuff with it(get data, process data etc.)and then gives back data as output. Both input and output are exchanged via this API.
The problem is that the API references code from javax.xml.bind, for example, JAXBContext while android doesn't have javax.xml.bind package in its core. (a well known issue)
Feasible solutions on the internet seems to be repackaging the code I need, but I don't know exactly what suppose to be.
Since the API reference classes in javax.xml.bind and javax.net, I guess I have to extract code from these 2 packages and make them part of the API (I have access to API source) and then repackage the API. However, I guess classes inside javax.xml.bind might have dependencies on other classes that not supported by Android, so does javax.net. (Please forgive me if this is stupid thought...)
So anyone know : whether there are classes, which codes in javax.xml.bind and javax.net depends on, not supported by android ?
Bit of tricky question really..
I will be really appreciated if you can provide a work around that enable a Android app to call an API that reference codes inside javax.xml.bind.
Try JiBX (http://jibx.sourceforge.net/), it's a small and fast footprint, Android compatible, XML binding framework.
I ended up with repacking those package which exists in standard Java library but not in Android. Basically, just get source code of all those missing packages and then put them into the API source and rename them into a name that is different from the original one and then change corresponding code in API that reference these methods as well (you have to use a different name, otherwise code reference methods in these package will still looking for methods in the core Library (i.e Android API)
Anyway, hope it helps. If you have the same problem.
If you have any better suggestion. Please share it!
Related
(I am newer of stack overflow user and sorry for my poor English.)
I am using WebRtc Android SDK to create a chat app, and our team decides to use
simulcast to deal with various abilities of participants. However, when I come to the SDK APIs, I can not find a way to use simulcast.
I use the SDK with offical-recommended manner:
implementation 'org.webrtc:google-webrtc:1.0.+'
(The concrete version is 1.0.28513.)
I have googled much and found some code fragment like this:
RtpTransceiver.RtpTransceiverInit transceiverInit =
new RtpTransceiver.RtpTransceiverInit(peerConnectionParameters.transDirection, mediaStreamLabels
/*, encodings*/ // cannot create Encoding instances
);
...
peerConnection.addTransceiver(MediaStreamTrack.MediaType.MEDIA_TYPE_VIDEO, transceiverInit);
However, when I try to create Encoding instances，I found the Encoding's constructor cannot be accessed, it is package access limit.
By the way, I have tried using reflection to forcibly create Encoding instances.
But it will cause an error when this code executes as might have been expected:
peerConnection.addTransceiver(MediaStreamTrack.MediaType.MEDIA_TYPE_VIDEO, transceiverInit);
I have also gone through the SDK APIs, and cannot find any other way to set up the simulcast.
So how should I use simulcast with webrtc android SDK?
I want to find classes in a certain package for creating objects using reflection. So basically, I have working code for plain JAVA applications. The problem is that
Package.getPackages()
and
this.getClass().getClassLoader().getResource(packageName);
does not seem to work for Android as I always get an empty array in the first case and null in the second. However, I tested the code in common JAVA using Unittests with the same test data and it worked.
Does anybody know a workaround? I know that there is a package manager, however I don't need a list of installed packages that refer to an APK. I want to enumerate all package URLs within an APK.
Regards,
Florian
Can anyone tell me, how to import Android hidden/internal API's into my application?
For example, com.android.internal.telephony. How to import this APi into application?
Thanks in advance.
If the classes are available at runtime, but not compile time, yes you can't compile against them directly in your code but you can still try to load them via reflection. We used this in Android 1.x to load a hidden internal class that controlled the LED light on some devices. It is difficult since every method call turns into several lines of calls to java.lang.reflect classes. See here:
http://www.google.com/codesearch#k59QJW14udA/android/src/com/google/zxing/client/android/camera/FlashlightManager.java
Of course, these APIs or classes would not at all be guaranteed to be present on all devices, and could change or disappear, so this is brittle. And it may be that there's a SecurityManager protecting access to certain internals too, I don't know.
I am a new developer for android programming. I understand android SDK does not contain all classes from android source code. For example, AtCommandResult.class is missing (hiding) from android.bluetooth package in the SDK.
Sometimes, however, I want to use the hidden code in my app and I wonder what would be the best way to do that. One approach I can think of would be to include its corresponding source code in my project with different package name to avoid conflict with existing core. But problem with this approach would be I have to maintain the code by myself from that point. One or two classes are OK but you know where I am going.
Is there any better way other than bothering google to include the code in the SDK? Thanks in advance.
You may want to use a .AIDL file:
http://developer.android.com/guide/developing/tools/aidl.html
Those can already be used to access for example in Telephony functions.
Code example here:
http://code.google.com/p/auto-answer/source/browse/trunk/src/com/android/internal/telephony/ITelephony.aidl?r=13
Is there a handy-dandy equivalent to org.apache.commons.beanutils.PropertyUtils on Android?
I can't seem to use bean utils in my android app due to some dependencies on PropertyDescriptor,and IndexedPropertyDescriptor. So I'm wondering if there are any alternatives?
Basically all I want to do is use a method name as a string "someMethod" and feed that into setMethod(anObject, "someMethod", value), much like PropertyUtils does; but without having to resort to the nasties of reflection...
Or are my hands tied and I need to use Reflection?
There is bridge library which works on Android: android-java-air-bridge.jar. Just include into project path and use all apache beanutils features in your Android project as you could use in ordinary java application. Moreover, there are lot of other classes which moved to this Android supporting library. Look at the list.
There is a possibilty to use libraries or write own code depending on the PropertyUtils. But it sure isn't dandy. You can get the general idea about what has to be done in this thread.
There are apparently some projects who have successfully solved the issue, so you can study thier solution. Take a look at Drawingpad-base and libgdx. You can find PropertyUtils in the package com.madrobot.beans in the first project and com.badlogic.gdx.beans in the second.