How to read images in android

Question

Objective : read an image and get its RGB pixel values .

Problem : thing is that i had created a new folder(img) under project(testing) in eclipse and had pasted a .jpg file(test.jpg) and tried to read it with this code :

tig = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory() +"/testing/img/test.jpg"); AlertDialog.Builder bld=new AlertDialog.Builder(this); bld.setTitle("hurray"); int pxl = tig.getPixel(30, 40); bld.setMessage(pxl); bld.show(); but at runtime application used to "Unfortunately close" , then i tried placing image in the asset folder and decodestream , no use .

question 1. is it not possible to create my own folder in project and place files there 2. or where should i place the image to read its pixels .

I need real spoon feeding here , coz im new to android development .

Thanks in advance .

Answer 1

From my understanding, I am guessing this is what you need

change

Bitmap src = (BitmapDrawable) this.getResources().getDrawable(R.drawable.yourimagename);

to

Bitmap src = BitmapFactory.decodeResource(context.getResources(),
                                       R.drawable.yourimagename);

and check again

Bitmap bitmap = src.copy(Bitmap.Config.ARGB_8888, true);
for(int x = 0;x < bitmap.getWidth();x++)
    for(int y = 0;y < bitmap.getHeight();y++)
    {
   // here bitmap.getPixel(x, y)) gets the pixel at the position (x,y)  
   int pixelvalue = bitmap.getPixel(x, y));
    int rValue = color.red(pixelvalue); // gives value of R in "RGB"
    int gValue = color.green(pixelvalue); // gives value of G in "RGB"
    int bValue = color.blue(pixelvalue); // gives value of B in "RGB"
}

Place your drawable here

Happy Coding