FileUtils.java

package com.gh4a.utils;

import android.text.TextUtils;
import android.util.Log;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;

public class FileUtils {
  private static final String LOG_TAG = "FileUtils";
  private static List<String> imageExts = Arrays.asList("png", "gif", "jpeg", "jpg", "bmp", "ico");

  public static boolean save(File file, InputStream inputStream) {
    OutputStream out = null;
    try {
      out = new FileOutputStream(file);
      int read;
      byte[] bytes = new byte[1024];

      while ((read = inputStream.read(bytes)) != -1) {
        out.write(bytes, 0, read);
      }
      return true;
    } catch (IOException e) {
      Log.e(LOG_TAG, e.getMessage(), e);
    } finally {
      try {
        if (inputStream != null) {
          inputStream.close();
        }
        if (out != null) {
          out.flush();
          out.close();
        }
      } catch (IOException e) {
        Log.e(LOG_TAG, e.getMessage(), e);
      }
    }
    return false;
  }

  public static String getFileExtension(String filename) {
    int mid = filename.lastIndexOf(".");
    if (mid == -1) {
      return "";
    }

    return filename.substring(mid + 1, filename.length());
  }

  public static String getFileName(String path) {
    if (TextUtils.isEmpty(path)) {
      return "";
    }
    int mid = path.lastIndexOf("/");
    if (mid == -1) {
      return path;
    }
    return path.substring(mid + 1, path.length());
  }

  public static boolean isImage(String filename) {
    if (TextUtils.isEmpty(filename)) {
      return false;
    }
    String ext = getFileExtension(filename);
    if (TextUtils.isEmpty(ext)) {
      return false;
    }

    return imageExts.contains(ext.toLowerCase(Locale.US));
  }
}