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Android Reference

Runtime


java.lang

Class Runtime



  • public class Runtime
    extends Object
    Allows Java applications to interface with the environment in which they are running. Applications can not create an instance of this class, but they can get a singleton instance by invoking getRuntime().
    See Also:
    System
    • Method Detail

      • exec

        public Process exec(String[] progArray)
                     throws IOException
        Executes the specified command and its arguments in a separate native process. The new process inherits the environment of the caller. Calling this method is equivalent to calling exec(progArray, null, null).
        Parameters:
        progArray - the array containing the program to execute as well as any arguments to the program.
        Returns:
        the new Process object that represents the native process.
        Throws:
        IOException - if the requested program can not be executed.
      • exec

        public Process exec(String[] progArray,
                   String[] envp)
                     throws IOException
        Executes the specified command and its arguments in a separate native process. The new process uses the environment provided in envp. Calling this method is equivalent to calling exec(progArray, envp, null).
        Parameters:
        progArray - the array containing the program to execute as well as any arguments to the program.
        envp - the array containing the environment to start the new process in.
        Returns:
        the new Process object that represents the native process.
        Throws:
        IOException - if the requested program can not be executed.
      • exec

        public Process exec(String[] progArray,
                   String[] envp,
                   File directory)
                     throws IOException
        Executes the specified command and its arguments in a separate native process. The new process uses the environment provided in envp and the working directory specified by directory.
        Parameters:
        progArray - the array containing the program to execute as well as any arguments to the program.
        envp - the array containing the environment to start the new process in.
        directory - the directory in which to execute the program. If null, execute if in the same directory as the parent process.
        Returns:
        the new Process object that represents the native process.
        Throws:
        IOException - if the requested program can not be executed.
      • exec

        public Process exec(String prog)
                     throws IOException
        Executes the specified program in a separate native process. The new process inherits the environment of the caller. Calling this method is equivalent to calling exec(prog, null, null).
        Parameters:
        prog - the name of the program to execute.
        Returns:
        the new Process object that represents the native process.
        Throws:
        IOException - if the requested program can not be executed.
      • exec

        public Process exec(String prog,
                   String[] envp)
                     throws IOException
        Executes the specified program in a separate native process. The new process uses the environment provided in envp. Calling this method is equivalent to calling exec(prog, envp, null).
        Parameters:
        prog - the name of the program to execute.
        envp - the array containing the environment to start the new process in.
        Returns:
        the new Process object that represents the native process.
        Throws:
        IOException - if the requested program can not be executed.
      • exec

        public Process exec(String prog,
                   String[] envp,
                   File directory)
                     throws IOException
        Executes the specified program in a separate native process. The new process uses the environment provided in envp and the working directory specified by directory.
        Parameters:
        prog - the name of the program to execute.
        envp - the array containing the environment to start the new process in.
        directory - the directory in which to execute the program. If null, execute if in the same directory as the parent process.
        Returns:
        the new Process object that represents the native process.
        Throws:
        IOException - if the requested program can not be executed.
      • exit

        public void exit(int code)
        Causes the VM to stop running and the program to exit. If runFinalizersOnExit(boolean) has been previously invoked with a true argument, then all objects will be properly garbage-collected and finalized first.
        Parameters:
        code - the return code. By convention, non-zero return codes indicate abnormal terminations.
      • freeMemory

        public long freeMemory()
        Returns the amount of free memory resources which are available to the running program.
        Returns:
        the approximate amount of free memory, measured in bytes.
      • gc

        public void gc()
        Indicates to the VM that it would be a good time to run the garbage collector. Note that this is a hint only. There is no guarantee that the garbage collector will actually be run.
      • getRuntime

        public static Runtime getRuntime()
        Returns the single Runtime instance.
        Returns:
        the Runtime object for the current application.
      • load

        public void load(String pathName)
        Loads and links the dynamic library that is identified through the specified path. This method is similar to loadLibrary(String), but it accepts a full path specification whereas loadLibrary just accepts the name of the library to load.
        Parameters:
        pathName - the absolute (platform dependent) path to the library to load.
        Throws:
        UnsatisfiedLinkError - if the library can not be loaded.
      • loadLibrary

        public void loadLibrary(String libName)
        Loads and links the library with the specified name. The mapping of the specified library name to the full path for loading the library is implementation-dependent.
        Parameters:
        libName - the name of the library to load.
        Throws:
        UnsatisfiedLinkError - if the library can not be loaded.
      • runFinalization

        public void runFinalization()
        Provides a hint to the VM that it would be useful to attempt to perform any outstanding object finalization.
      • runFinalizersOnExit

        @Deprecated
        public static void runFinalizersOnExit(boolean run)
        Deprecated. This method is unsafe.
        Sets the flag that indicates whether all objects are finalized when the VM is about to exit. Note that all finalization which occurs when the system is exiting is performed after all running threads have been terminated.
        Parameters:
        run - true to enable finalization on exit, false to disable it.
      • totalMemory

        public long totalMemory()
        Returns the total amount of memory which is available to the running program.
        Returns:
        the total amount of memory, measured in bytes.
      • traceInstructions

        public void traceInstructions(boolean enable)
        Switches the output of debug information for instructions on or off. On Android, this method does nothing.
        Parameters:
        enable - true to switch tracing on, false to switch it off.
      • traceMethodCalls

        public void traceMethodCalls(boolean enable)
        Switches the output of debug information for methods on or off.
        Parameters:
        enable - true to switch tracing on, false to switch it off.
      • getLocalizedInputStream

        @Deprecated
        public InputStream getLocalizedInputStream(InputStream stream)
        Deprecated. Use InputStreamReader.
        Returns the localized version of the specified input stream. The input stream that is returned automatically converts all characters from the local character set to Unicode after reading them from the underlying stream.
        Parameters:
        stream - the input stream to localize.
        Returns:
        the localized input stream.
      • getLocalizedOutputStream

        @Deprecated
        public OutputStream getLocalizedOutputStream(OutputStream stream)
        Deprecated. Use OutputStreamWriter.
        Returns the localized version of the specified output stream. The output stream that is returned automatically converts all characters from Unicode to the local character set before writing them to the underlying stream.
        Parameters:
        stream - the output stream to localize.
        Returns:
        the localized output stream.
      • addShutdownHook

        public void addShutdownHook(Thread hook)
        Registers a VM shutdown hook. A shutdown hook is a Thread that is ready to run, but has not yet been started. All registered shutdown hooks will be executed when the VM terminates normally (typically when the exit(int) method is called).

        Note that on Android, the application lifecycle does not include VM termination, so calling this method will not ensure that your code is run. Instead, you should use the most appropriate lifecycle notification (Activity.onPause, say).

        Shutdown hooks are run concurrently and in an unspecified order. Hooks failing due to an unhandled exception are not a problem, but the stack trace might be printed to the console. Once initiated, the whole shutdown process can only be terminated by calling halt().

        If runFinalizersOnExit(boolean) has been called with a true argument, garbage collection and finalization will take place after all hooks are either finished or have failed. Then the VM terminates.

        It is recommended that shutdown hooks do not do any time-consuming activities, in order to not hold up the shutdown process longer than necessary.

        Parameters:
        hook - the shutdown hook to register.
        Throws:
        IllegalArgumentException - if the hook has already been started or if it has already been registered.
        IllegalStateException - if the VM is already shutting down.
      • removeShutdownHook

        public boolean removeShutdownHook(Thread hook)
        Unregisters a previously registered VM shutdown hook.
        Parameters:
        hook - the shutdown hook to remove.
        Returns:
        true if the hook has been removed successfully; false otherwise.
        Throws:
        IllegalStateException - if the VM is already shutting down.
      • availableProcessors

        public int availableProcessors()
        Returns the number of processors available to the VM, at least 1.
      • maxMemory

        public long maxMemory()
        Returns the maximum amount of memory that may be used by the virtual machine, or Long.MAX_VALUE if there is no such limit.
        Returns:
        the maximum amount of memory that the VM will try to allocate, measured in bytes.


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