I want to get a line of Java code from user and execute it in Android. For example:
String strExecutable = " int var; var = 4 + 3"
Object obj = aLibrary.eval(strExecutable);
It is not java script and I want to run a java code.
Is it possible? If yes how?
I have studied links like this. But they are questions about JVM not Android Dalvik.
You can try BeanShell! It's super easy and works also on android. Just build your app with jar library.
import bsh.Interpreter;
private void runString(String code){
Interpreter interpreter = new Interpreter();
try {
interpreter.set("context", this);//set any variable, you can refer to it directly from string
interpreter.eval(code);//execute code
}
catch (Exception e){//handle exception
e.printStackTrace();
}
}
But be careful! Using this in production app may be security risk, especially if your app interacts with users data / files.
You can try something like this:
// Code Execute, Khaled A Khunaifer, 27 March 2013
class CodeExcute
{
public static void execute (String[] commands, String[] headers)
{
// build commands into new java file
try
{
FileWriter fstream = new FileWriter("Example.java");
BufferedWriter out = new BufferedWriter(fstream);
out.write("");
for (String header : headers) out.append(header);
out.append("class Example { public static void main(String args[]) { ");
for (String cmd : commands) out.append(cmd);
out.append(" } }");
out.close();
}
catch (Exception e)
{
System.err.println("Error: " + e.getMessage());
}
// set path, compile, & run
try
{
Process tr = Runtime.getRuntime().exec(
new String[]{ "java -cp .",
"javac Example.java",
"java Example" } );
}
catch (Exception e)
{
System.err.println("Error: " + e.getMessage());
}
}
}
