FileUtils.java

package com.o3dr.android.client.utils;

import android.content.Context;

import org.droidplanner.services.android.impl.utils.file.DirectoryPath;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

public class FileUtils {

    public static final String CAMERA_FILENAME_EXT = ".xml";
    public static final SimpleDateFormat timestampFormatter = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss_SSS", Locale.US);

	public static File[] getCameraInfoFileList(Context context) {
		FilenameFilter filter = new FilenameFilter() {
			@Override
			public boolean accept(File dir, String filename) {
				return filename.contains(CAMERA_FILENAME_EXT);
			}
		};
		return getFileList(DirectoryPath.getCameraInfoPath(context), filter);
	}

	private static File[] getFileList(String path, FilenameFilter filter) {
		File mPath = new File(path);
        if(!mPath.exists())
            return new File[0];

        return mPath.listFiles(filter);
	}

    public static FileOutputStream getExceptionFileStream(Context context) throws FileNotFoundException {
        File myDir = new File(DirectoryPath.getCrashLogPath(context));
        if (!myDir.exists())
            myDir.mkdirs();

        File file = new File(myDir, getTimeStamp() + ".log");
        if (file.exists())
            file.delete();
        return new FileOutputStream(file);
    }

    /**
     * Timestamp for logs in the Mission Planner Format
     */
    static public String getTimeStamp(long timestamp) {
        return timestampFormatter.format(new Date(timestamp));
    }

    private static String getTimeStamp() {
        return getTimeStamp(System.currentTimeMillis());
    }

    public static String getFilenameWithoutExtension(File file){
        return getFilenameWithoutExtension(file.getName());
    }

    public static String getFilenameWithoutExtension(String filename){
        int pos = filename.lastIndexOf(".");
        if (pos >= 0) {
            filename = filename.substring(0, pos);
        }
        return filename;
    }

    public static String getFileExtension(File file){
        return getFileExtension(file.getName());
    }

    public static String getFileExtension(String filename){
        String extension = "";
        int pos = filename.lastIndexOf(".");
        if(pos >= 0){
            extension = filename.substring(pos);
        }
        return extension;
    }
}