Converting string to math expression in android? [duplicate] - java

Is it possible to reference the javax.script.ScriptEngine library when developing an android application?
If not is there anyway possible to evaluate a javascript expression in android?

For the classes javax.script.ScriptEngine, javax.script.ScriptEngineFactory and so on, you can add the jsr223.jar to your Android project: just copy the .jar file to your libs directory, and add it from Properties->Java Build Path.
These class will allow your JSR 223-compliant engines to compile. You can then do new SomeScriptEngienFactory().getScriptEngine() to get an engine. I've managed to do this with JNLua 1.0.4 and Rhino 1.7R2.
The file jsr223.jar can be downloaded from http://www.java2s.com/Code/Jar/j/Downloadjsr223jar.htm, a direct link is http://www.java2s.com/Code/JarDownload/jsr223/jsr223.jar.zip.

javax.script.ScriptEngine is not a default part of android, but you could easily jar up any libraries you need(assuming the size is reasonable, I'm not sure) and include them in your project.

According to this post, javax.script.ScriptEngine is not available in Android SDK. You can try the steps below to include the library, but the code may not run, even though it will compile.
Using Android Development Toolkit in Windows, I performed the following steps to get javax.script library.
Right-clicked on the project, went to Properties (Project).
Under the Java Build Path, I chose Libraries tab.
Select Add Library located on the middle right of the Tab
Select JRE System Library under Add Library and click Next...
Select Workspace Default JRE (jre 7)
Click Finish.
Click Ok on the Java Build Path to exist project properties.
Javax.script was then loaded.

If you want to evaluate some code in JS in android
1) to your gradle dependencies add (rhino):
compile 'org.mozilla:rhino:1.7R4'
2) write some code like this to get the result of JS evaluation
Context rhino = Context.enter()
// turn off optimization to work with android
rhino.optimizationLevel = -1
String evaluation = "2+2"
try {
ScriptableProject scope = rhino.initStandardObjects()
String result = rhino.evaluateString(scope, evaluation, "JavaScript", 1, null).toString()
} finally {
Context.exit()
}
3) You can write more complex scripts in JS to run in the android app also (functions etc.)

Related

How To Upload Android Library For Private Use Only?

I have an Android app but require to create two Different copies of it with different package names. The reason for wanting two package names is that I want to upload them to two different Stores which requires the developer to provide a different package name.
To simplify the update process and fixing the issues I thought of dividing my code to different libraries.
I have now created an android library and now want to upload it so that I can simply use the library in my projects by simply adding the line compile com.adc.aaa...
But I do not want those library to be accessible to other developers either directly of maybe through google Search. Is it possible to achieve this?
These are few links which I have visited regarding this matter
1) https://inthecheesefactory.com/blog/how-to-upload-library-to-jcenter-maven-central-as-dependency/en
2) https://mayojava.github.io/android/library/creating-and-distributing-your-own-android-library/
Can anyone please help.
Suposing your module in android studio is called "library" you can simply add the module to your app project locally without the need to upload it to bitray.
You can add a local module as a depedency to your project using AS or manually:
1) Using AS:
Go to File -> Project structure. Click on the app module and then depedencies, click on the plus sign and then choose 3 - Module Dependency. If you library is in the same folder as your app it'll show up there. Just select it and it will be added as a depedency like the other compile dependencies.
2) Manually
In your settings.gradle file add:
include ':app', ':library'
In your app leve build.gradle:
implementation project(':library')
If you library module is somewhere else you can inport it to your project using:
File -> New-> Import Module

Why is Visual Studio trying to use the wrong JDK version?

I am trying to build WeatherApp, which comes from this tutorial, but I am seeing this error:
The specified task executable location "C:\Program Files (x86)\Java\jdk1.7.0_55\bin\javac.exe" is invalid.
and this warning (not sure if they are related):
Found conflicts between different versions of the same dependent assembly. In Visual Studio, double-click this warning (or select it and press Enter) to fix the conflicts; otherwise, add the following binding redirects to the "runtime" node in the application configuration file: <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"><dependentAssembly><assemblyIdentity name="System.Runtime" culture="neutral" publicKeyToken="b03f5f7f11d50a3a" /><bindingRedirect oldVersion="0.0.0.0-4.1.0.0" newVersion="4.1.0.0" /></dependentAssembly></assemblyBinding>
I can doube-click the warning to make it go away, but the error remains. I am not sure why the project is trying to use that version of the jdk, as I have changed my xamarin optioins to point at Program Files instead:
Why is Visual Studio trying to use that versioin of the JDK?
Sometimes there's a sdk.caches file that will hold an old reference. Please try to delete both your obj/bin folders and see if that resolves the issue. If it doesn't, turn up your Build Output verbosity and attach a Build Output Log to your post:
https://forums.xamarin.com/discussion/27515/how-to-obtain-diagnostic-build-logs (XS)
http://blogs.msdn.com/b/msbuild/archive/2005/09/29/475157.aspx (VS)

Access restriction: The type 'Application' is not API (restriction on required library rt.jar)

Here is the code:
package mscontroller;
import javax.swing.*;
import com.apple.eawt.Application;
public class Main {
public static void main(String[] args)
{
Application app = new Application();
app.setEnabledAboutMenu(true);
AMEListener listener = new AMEListener();
app.addApplicationListener(listener);
JFrame mainFrame = new JFrame("Application Menu Example");
mainFrame.setSize(500, 500);
mainFrame.setVisible(true);
}
}
here is the error:
Exception in thread "main" java.lang.Error: Unresolved compilation
problems: Access restriction: The type 'Application' is not API
(restriction on required library
'/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/rt.jar')
Access restriction: The constructor 'Application()' is not API
(restriction on required library
'/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/rt.jar')
Access restriction: The type 'Application' is not API (restriction on
required library
'/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/rt.jar')
Access restriction: The method
'Application.setEnabledAboutMenu(boolean)' is not API (restriction on
required library
'/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/rt.jar')
AMEListener cannot be resolved to a type AMEListener cannot be
resolved to a type
at mscontroller.Main.main(Main.java:9)
eclipse says this:
Access restriction: The type 'Application' is not API (restriction on required library '/Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre/lib/rt.jar')
This happened to me as well, and the answers given here already were not satisfying, so I did my own research.
Background: Eclipse access restrictions
Eclipse has a mechanism called access restrictions to prevent you from accidentally using classes which Eclipse thinks are not part of the public API. Usually, Eclipse is right about that, in both senses: We usually do not want to use something which is not part of the public API. And Eclipse is usually right about what is and what isn't part of the public API.
Problem
Now, there can be situations, where you want to use public Non-API, like sun.misc (you shouldn't, unless you know what you're doing). And there can be situations, where Eclipse is not really right (that's what happened to me, I just wanted to use javax.smartcardio). In that case, we get this error in Eclipse.
Solution
The solution is to change the access restrictions.
Go to the properties of your Java project,
i.e. by selecting "Properties" from the context menu of the project in the "Package Explorer".
Go to "Java Build Path", tab "Libraries".
Expand the library entry
select
"Access rules",
"Edit..." and
"Add..." a "Resolution: Accessible" with a corresponding rule pattern.
For me that was "javax/smartcardio/**", for you it might instead be "com/apple/eawt/**".
I was having the same problem. When I initially created the java project in Eclipse I specified JRE 8. When I went into the project's build path and edited the JRE System Library, the Java 8 execution environment was selected. When I chose to use an "Alernate JRE" (still java 8) it fixed the error for me.
Adding javafx accessible permission in eclipse oxygen
go to project> properties> java build path> libraries> then expand the libraries and double click on> Access rules there you set the permission
Resolution : Accessible
Rule Pattern : javafx/**
To begin with (and unrelated), instantiating the Application class by yourself does not seem to be its intended use. From what one can read from its source, you are rather expected to use the static instance returned by getApplication().
Now let's get to the error Eclipse reports. I've ran into a similar issue recently: Access restriction: The method ... is not API (restriction on required project). I called the method in question as a method of an object which inherited that method from a super class. All I had to do was to add the package the super class was in to the packages imported by my plugin.
However, there is a lot of different causes for errors based on "restriction on required project/library". Similar to the problem described above, the type you are using might have dependencies to packages that are not exported by the library or might not be exported itself. In that case you can try to track down the missing packages and export them my yourself, as suggested here, or try Access Rules. Other possible scenarios include:
Eclipse wants to keep you from using available packages that are not part of the public Java API (solution 1, 2)
Dependencies are satisfied by multiple sources, versions are conflicting etc. (solution 1, 2, 3)
Eclipse is using a JRE where a JDK is necessary (which might be the case here, from what your errors say; solution) or JRE/JDK version in project build path is not the right one
This ended up as more like a medley of restriction-related issues than an actual answer. But since restriction on required projects is such a versatile error to be reported, the perfect recipe is probably still to be found.
We had to change our application to build against the JDK 1.8 using Window->Preferences->Java->Installed JREs. However, after changing that, the JRE System Library specified in the Project Explorer was still incorrect. To fix this, right click on "JRE System Library [wrong-jre-here]" and change from Execution environment: to "Workspace Default (yer-default-here)"
I had this problem because the project facet associated with my project was the wrong java version.
To fix this is I did the following:
Right click on the project and select Properties
Select 'Project Facets' and change version of java to something greater than 1.4.
Click [Apply]
This will rebuild your project and hopefully the error will be resolved.
It worked: Project Properties -> ProjectFacets -> Runtimes -> jdk1.8.0_45 -> Apply
In the Eclipse top menu bar:
Windows -> Preferences -> Java -> Compiler -> Errors/Warnings ->
Deprecated and restricted API -> Forbidden reference (access rules): -> change to warning
If you're having this same issue using Spring Tool Suite:
The Spring Tool Suite's underlying IDE is, in fact, Eclipse. I've gotten this error just now trying to use some com.sun.net classes. To remove these errors and prevent them from popping up in the Eclipse Luna SR1 (4.4.2) platform of STS:
Navigate to Project > Properties
Expand the Java Compiler heading
Click on Errors/Warnings
Expand deprecated and restricted API
Next to "Forbidden reference (access rules)" select "ignore"
Next to "Discouraged reference (access rules)" select "ignore"
You're good to go.
Had the same problem. Here's how I solved it:
Go to Package Explorer. Right click on JRE System Library and go to Properties. In the Classpath Container > Select JRE for the project build path select the third option (Workspace default JRE).
Source : https://thenewboston.com/forum/topic.php?id=3917
We use IBM Rational Application Developer (RAD) and had the same problem.
ErrorMessage:
Access restriction: The type 'JAXWSProperties' is not API (restriction on required library 'C:\IBM\RAD95\jdk\jre\lib\rt.jar')
Solution:
go to java build path and under Library tab, remove JRE System Library. Then again Add Library --> JRE System Library
Go to the following setting:
Window -> Preferences -> Java-Compiler-Errors/Warnings-Deprecated and restricted API-Forbidden reference (access rules)
Set it to Warning or Ignore.
In Eclipse Mars.2 Release (4.5.2):
Project Explorer -> Context menu -> Properties -> JavaBuildPath -> Libraries
select JRE... and press Edit: Switch to Workspace JRE (jdk1.8.0_77)
Works for me.
Even if its old question, for me in Eclipse I just right click on Src folder and properties (Alt+Enter) and the check for the Ignore optional compile problems removed the error.
I have eclipse JRE 8.112 , not sure if that matters but what i did was this:
Right clicked on my projects folder
went down to properties and clicked
clicked on the java build path folder
once inside, I was in the order and export
I checked the JRE System Library [jre1.8.0_112]
then moved it up above the one other JRE system library there (not sure if this mattered)
then pressed ok
This solved my problem.
I simply just add e(fx)clipse in eclipse marketplace. Easy and simple
Remove Existing/Configured System Library:
Eclipse(IDE) -> Project Explorer -> Project Name-> (Option) Build Path -> Configure Build Path -> Java Build Path -> Libraries -> (Select) JRE System Library [(For me)jre1.8.0_231] -> Remove.
Currently you are at same location:
Eclipse(IDE) -> Project Explorer -> Project Name-> (Option) Build Path -> Configure Build Path -> Java Build Path -> Libraries
Now Add Same System Library Again:
Add Library -> JRE System Library -> Workspace default JRE ((For me)jre1.8.0_231) -> Finish -> Apply -> Close.
Now wait to finish it.
I'm using eclipse neon 3. I just wanted to use javafx.application.Application, so I followed Christian Hujer's answer above and it worked. Just some tips: the access rules are very similar to the import statement. For me, the access rules I added was "javafx/application/**". Just replace the dot in the import statement with forward slash and that's the rule. Hope that helps.
I had a little different problem. In Project - Properties - Libraries - JRE library, I had the wrong JRE lib version. Remove and set the actual one, and voila - all Access restriction... warnings are away.
If someone is having this issue only in your CI tool while running maven, what did the trick for me was to explicitly define the execution environment in your MANIFEST.MF.
In my case, I did this by inserting the following line in my OSGi bundle manifest file:
Bundle-RequiredExecutionEnvironment: JavaSE-1.8
What worked for me was adding the access restricted package to the MANIFEST.MF file. In Eclipse, the "Access Restricted" errors showed up in the Problems tab for several files. I just right clicked on each error, clicked "Quick Fix", and chose "Add '[package]' to imported packages".
I had faced the same error on Eclipse 4.20.0 with JRE 1.8. To get rid of this compilation error, do the following:
Project --> Properties --> Java Compiler --> Errors/Warnings --> Deprecated and Restricted API --> Forbidden Reference (access rules) --> ignore

Multiple builds from same code base in Eclipse

I'm pretty new to Java and Eclipse coming from an iOS/xCode background. I have an iOS project that has 2 builds, 1 that uses a test server and 1 that uses a live server. In xCode this was simply a case of adding a new build target, a Preprocessor Macro, than using #ifdef in code to use separate url's for each build.
Porting this over to Android, I have this list of things I need to do each time I want to build/test between the 2 versions
TO SWITCH BETWEEN LIVE AND TEST
Rename Application Package com.mybus.myapp/com.mybus.myapptestserver (Right click, Android Tools, Rename Application Package).
Rename com.mybus.myapp folder to com.mybus.myapptestserver.
Change Map API key in manifest
Change SENDER_ID in BeginActivity.java (Notification app ID).
Search and change all references com.mybus.myapp/com.mybus.myapptestserver (Including SharedPreferences).
Change URL's in ConnectionHelper.java and PasswordResetConnection.java
Change icon and label in Manifest for Application & BeginActivity.
Remove crash reporter (ACRA) from MyApplication.java.
Change .setSmallIcon(R.drawable.ic_test_launcher) & .setContentTitle("myapptestserver") in GCMIntentService.java
Surely there is an easier way to build seperate builds and allow them both on a device at the same time?
You could use Ant script to do this. Once you customise your Ant script to handle all these changes, you can get the final output by running the ant release command.
An small example from where you could start with. I have written a post about it. This ant script, doesn't change any values in files, but what it does, is outputs the final apk, with a chosen name format, and puts it in a specified folder.
http://techdroid.kbeanie.com/2011/09/automating-builds-on-android-part-1.html
http://techdroid.kbeanie.com/2011/09/automating-builds-on-android-part-2.html
Disclaimer: These are links to my blog posts.

Programmatically generate an Eclipse project

I use eclipse to work on an application which was originally created independently of eclipse. As such, the application's directory structure is decidedly not eclipse-friendly.
I want to programmatically generate a project for the application. The .project and .classpath files are easy enough to figure out, and I've learned that projects are stored in the workspace under <workspace>/.metadata/.plugins/org.eclipse.core.resources/.projects
Unfortunately, some of the files under here (particularly .location) seem to be encoded in some kind of binary format. On a hunch I tried to deserialize it using ObjectInputStream - no dice. So it doesn't appear to be a serialized java object.
My question is: is there a way to generate these files automatically?
For the curious, the error I get trying to deserialize the .location file is the following:
java.io.StreamCorruptedException: java.io.StreamCorruptedException: invalid stream header: 40B18B81
Update: My goal here is to be able to replace the New Java Project wizard with a command-line script or program. The reason is the application in question is actually a very large J2EE/weblogic application, which I like to break down into a largish (nearly 20) collection of subprojects. Complicating matters, we use clearcase for SCM and create a new branch for every release. This means I need to recreate these projects for every development view (branch) I create. This happens often enough to automate.
You should be able to accomplish this by writing a small Eclipse plugin. You could even extend it out to being a "headless" RCP app, and pass in the command line arguments you need.
The barebones code to create a project is:
IProgressMonitor progressMonitor = new NullProgressMonitor();
IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
IProject project = root.getProject("DesiredProjectName");
project.create(progressMonitor);
project.open(progressMonitor);
Just take a look at the eclipse code for the Import Project wizard to give you a better idea of where to go with it.
Use AntEclipse
It can create eclipse projects from ant.
To create java project you can use JavaCore from org.eclipse.jdt.core.JavaCore. As a sourceProject you can use generic project item, which has been suggested by #James Van Huis
IJavaProject javaSourceProject = JavaCore.create(sourceProject);

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