find Color from View by location - Android User Interface

Android examples for User Interface:View Background

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Description

find Color from View by location

Demo Code


//package com.java2s;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.drawable.BitmapDrawable;
import android.view.View;
import android.widget.ImageView;

public class Main {
    public static int findColor(View view, int x, int y)
            throws NullPointerException {

        int red = 0;
        int green = 0;
        int blue = 0;
        int color = 0;

        int offset = 1; // 3x3 Matrix
        int pixelsNumber = 0;

        int xImage = 0;
        int yImage = 0;

        ImageView imageView = (ImageView) view;
        BitmapDrawable bitmapDrawable = (BitmapDrawable) imageView
                .getDrawable();/*from   w  w  w. j  av a  2  s .c o m*/
        Bitmap imageBitmap = bitmapDrawable.getBitmap();

        xImage = (int) (x * ((double) imageBitmap.getWidth() / (double) imageView
                .getWidth()));
        yImage = (int) (y * ((double) imageBitmap.getHeight() / (double) imageView
                .getHeight()));

        for (int i = xImage - offset; i <= xImage + offset; i++) {
            for (int j = yImage - offset; j <= yImage + offset; j++) {
                try {
                    color = imageBitmap.getPixel(i, j);
                    red += Color.red(color);
                    green += Color.green(color);
                    blue += Color.blue(color);
                    pixelsNumber += 1;
                } catch (Exception e) {
                    //Log.w(TAG, "Error picking color!");
                }
            }
        }
        red = red / pixelsNumber;
        green = green / pixelsNumber;
        blue = blue / pixelsNumber;

        return Color.rgb(red, green, blue);
    }
}

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