Hypatia/app/src/main/java/us/spotco/malwarescanner/Utils.java

package us.spotco.malwarescanner;

import android.app.ActivityManager;
import android.content.Context;

import java.io.File;
import java.util.HashSet;
import java.util.Set;

class Utils {

    private final static int MAX_FILE_SIZE = (1000 * 1000) * 50; //50MB

    public static Set<File> getFilesRecursive(File root) {
        Set<File> filesAll = new HashSet<>();

        File[] files = root.listFiles();
        if (files != null && files.length > 0) {
            for (File f : files) {
                if (f.isDirectory()) {
                    Set<File> filesTmp = getFilesRecursive(f);
                    if (filesTmp != null) {
                        filesAll.addAll(filesTmp);
                    }
                } else {
                    if (f.length() <= MAX_FILE_SIZE) {//Exclude files larger than 50MB for performance
                        filesAll.add(f);
                    }
                }
            }
        }

        return filesAll;
    }

    //Credit: https://stackoverflow.com/a/5921190
    public static boolean isServiceRunning(Class<?> serviceClass, Context context) {
        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        for (ActivityManager.RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
            if (serviceClass.getName().equals(service.service.getClassName())) {
                return true;
            }
        }
        return false;
    }

}