what is the use of MemoryFile in android

Question

I want to write some bytes to a shared memory. This is done in my application1. From my another application: application2 I want to access that shared memory to read the wri

Answer 1

I suspect memory files don't have the getParcelFileDescriptor method. When I commented this getParcelFileDescriptor related methods and use getFileDescriptor. It worked nicely.

import java.io.FileDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import android.os.MemoryFile;

/**
 * Invoke hidden methods using reflection
 * 
 */
public class MemoryFileUtil {
    private static final Method sMethodGetFileDescriptor;
    static {
        sMethodGetFileDescriptor = get("getFileDescriptor");
    }

    public static FileDescriptor getFileDescriptor(MemoryFile file) {
        try {
            return (FileDescriptor) sMethodGetFileDescriptor.invoke(file);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }

    private static Method get(String name) {
        try {
            return MemoryFile.class.getDeclaredMethod(name);
        } catch (NoSuchMethodException e) {
            throw new RuntimeException(e);
        }
    }
}

And created File descriptor from memory file.

FileDescriptor fd = MemoryFileUtil.getFileDescriptor(memFile);