Android Open Source - filtrations File Helper

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License

The source code is released under:

GNU General Public License

Java Source Code

package sk.feromakovi.android.opencv.filtrations.util;
//www .  ja  v  a 2 s.  com
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.net.Uri;
import android.provider.MediaStore;
import android.util.Base64;

public class FileHelper {

  public static String bitmapToString(Bitmap b){
    ByteArrayOutputStream baos = new ByteArrayOutputStream();  
      b.compress(Bitmap.CompressFormat.JPEG, 100, baos);
      return Base64.encodeToString(baos.toByteArray(),Base64.DEFAULT); //"data:image/png;base64," +
  }
  
  public static Bitmap stringToBitmap(String base){
    byte[] decodedByte = Base64.decode(base, 0);
      return BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
  }
  
  public static void deleteFolder(String filename) {
    java.io.File f = new java.io.File(filename);
    if (f.isFile()) {
      f.delete();
    }
    if (f.isDirectory() && !f.getName().equals(".") && !f.getName().equals("..")) {
      String[] files = f.list();
      for (String item : files) {
        deleteFolder(filename + "/" + item);
      }
    }
    if (f.isDirectory()) {
      f.delete();
    }
  }

  public static Bitmap getBitmapFromUri(Context ctx, Uri imageUri) {
    Bitmap b;
    try {
      b = MediaStore.Images.Media.getBitmap(ctx.getContentResolver(), imageUri);
      if(Math.max(b.getHeight(), b.getWidth()) > 2000){
        return Bitmap.createScaledBitmap(b, b.getWidth() / 2, b.getHeight() / 2, true);
      }else
        return b;
    } catch (Exception e) {
      e.printStackTrace();
    }     
    return null;
  }
  
  public static Bitmap getBitmapFromFile(String filePath){
    Bitmap b = null;
    try{
      b = BitmapFactory.decodeFile(filePath);
      if(Math.max(b.getHeight(), b.getWidth()) > 2000)
        b = Bitmap.createScaledBitmap(b, b.getWidth() / 2, b.getHeight() / 2, true);
      b = toGrayscale(b);
    }catch (Exception e) {
      e.printStackTrace();
    }
    return b;
  }

  /**
     * Convert bitmap to the grayscale
     *
     * @param bmpOriginal Original bitmap
     * @return Grayscale bitmap
     */
    public static Bitmap toGrayscale(Bitmap bmpOriginal) {
        final int height = bmpOriginal.getHeight();
        final int width = bmpOriginal.getWidth();

        final Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        final Canvas c = new Canvas(bmpGrayscale);
        final Paint paint = new Paint();
        final ColorMatrix cm = new ColorMatrix();
        cm.setSaturation(0);
        final ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
        paint.setColorFilter(f);
        c.drawBitmap(bmpOriginal, 0, 0, paint);
        return bmpGrayscale;
    }
  
  public static boolean copy(File file, String path, boolean rewrite) {
    try {
      File dest = new File(path);
      if (dest.exists() && !rewrite)
        return false;
      if (dest.exists())
        dest.delete();
      dest.createNewFile();
      int read = -1;
      byte[] buffer = new byte[1024];
      FileInputStream fis = new FileInputStream(file);
      FileOutputStream fos = new FileOutputStream(dest);
      while ((read = fis.read(buffer)) != -1) {
        fos.write(buffer, 0, read);
      }
      fos.flush();
      fis.close();
      fos.close();
      return true;
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    return false;
  }
}

Java Source Code List

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