Android Open Source - dejalist Product Image File Helper

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License

The source code is released under:

Apache License

Java Source Code

package com.luboganev.dejalist.data;
//from w  ww.  j a v a  2  s.  c o  m
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.Context;
import android.net.Uri;
import com.luboganev.dejalist.Utils;

public class ProductImageFileHelper {
  private static final String TAG = "ProductPicturesFileHelper";
  private static final String PRODUCT_IMAGES_DIR = "product_images";
  private static final String PRODUCT_FILE_PREFIX = "product_";
  private static final String PRODUCT_FILE_SUFFIX = ".jpg";
  
  private static final File getFreshFile(Context context) {
    File imagesDir = new File(context.getFilesDir(), PRODUCT_IMAGES_DIR);
    if(!imagesDir.exists()) imagesDir.mkdirs();
    Utils.currentTimestampInMillis();
    return new File(imagesDir, PRODUCT_FILE_PREFIX+Utils.currentTimestampInMillis()+PRODUCT_FILE_SUFFIX);
  }
  
  /**
   * This is a function which deletes the wrong folder with product images
   * which used to be created in a bad way. The Android SDK is so genius that 
   * it provides two methods: getDir and getFilesDir. However, It turns out that the 
   * getDir is completely unusable by any of the goodies like FileProvider. 
   * Therefore, we have to move all files to a new folder that is created by 
   * calling getFilesDir, and not getDir as it used to be :( This method should be
   * called once the whole move and the necessary DB changes are performed
   */
  public static final void deleteWrongImagesFolder(Context context) {
    File imagesDir = context.getDir(PRODUCT_IMAGES_DIR, Context.MODE_PRIVATE);
    File[] allProductPhotosFiles = imagesDir.listFiles();
    for (File file : allProductPhotosFiles) {
      file.delete();
    }
    imagesDir.delete();
  }
  
  public static final File getFile(Context context, String filename) {
    File imagesDir = new File(context.getFilesDir(), PRODUCT_IMAGES_DIR);
//    File imagesDir = context.getDir(PRODUCT_IMAGES_DIR, Context.MODE_PRIVATE);
    if(!imagesDir.exists()) imagesDir.mkdirs();
    return new File(imagesDir, filename);
  }
  
  public static Uri copyToANewProductImageFile(Context context, Uri uri) {
    File inputFile = new File(uri.getPath());
    if(inputFile.exists()) {
      File freshFile = getFreshFile(context);
      if(freshFile.exists()) {
        Utils.e(TAG, "moveToANewProductImageFile(Context, Uri) - Fresh file already exists!");
        return null;
      }
      else {
        try {
          freshFile.createNewFile();
        } catch (IOException e) {
          Utils.e(TAG, "moveToANewProductImageFile(Context, Uri) - Could not create a new fresh file!");
          return null;
        }
        if(!copy(inputFile, freshFile)) {
          Utils.e(TAG, "moveToANewProductImageFile(Context, Uri) - Could not copy to a new fresh file!");
          return null;
        }
        return Uri.fromFile(freshFile);
      }
    }
    else {
      Utils.e(TAG, "moveToANewProductImageFile(Context, Uri) - File with the given input Uri does not exist!");
      return null;
    }
  }
  
  public static boolean deleteProductImageFile(Uri uri) {
    File file = new File(uri.getPath());
    if(file.exists() && file.isFile()) {
      file.delete();
      return true;
    }
    else {
      Utils.e(TAG, "deleteProductImageFile(Uri) - File with the given input Uri does not exist!");
      return false;
    }
  }
  
  public static void deleteAllProductImageFiles(Context context) {
    File imagesDir = new File(context.getFilesDir(), PRODUCT_IMAGES_DIR);
    if(imagesDir.exists()) {
      File[] allProductPhotosFiles = imagesDir.listFiles();
      for (File file : allProductPhotosFiles) {
        file.delete();
      }
    }
  }
  
  public static boolean copy(File src, File dst) {
    try {
      InputStream in = new FileInputStream(src);
      return copy(in, dst);
    } catch (FileNotFoundException e) {
      return false;
    }
  }
  
  public static boolean copy(InputStream src, File dst) {
    InputStream in = null;
    OutputStream out = null;
    boolean success = false;
    try {
        in = src;
        out = new FileOutputStream(dst);
  
        // Transfer bytes from in to out
        byte[] buf = new byte[1024];
        int len;
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
        }
        in.close();
        out.close();
        success = true;
    }
    catch (IOException e){
       Utils.e(TAG, "copy(File, File) IOException - " + e.getMessage());
    }
    finally {
      try{
        if(in != null) in.close();
          if(out != null) out.close();
      }
      catch (IOException ex) { Utils.e(TAG, "copy(File, File) IOException - " + ex.getMessage()); }
    }
    return success;
  }
}

Java Source Code List

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