Change/Replacement/Remove pixel colors in ImageView (Android)

Before Pixel Color Replacement

After Pixel Color Replacement

Create new Android Project

Project Name: PlayingwithBitmap

Build Target: Android 2.3.3   //or greater than that

Application Name: PlayingwithBitmap

Package Name: com.shaikhhamadali.blogspot.playingwithbitmap

Create Activity: Main

Min SDK: 10 // or greater than that

1. create main layout:

• One image view to display the image.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff" >

    <ImageView
        android:id="@+id/imViewAndroid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:src="@drawable/car" />

</RelativeLayout>

 2. code of main activity:

package com.shaikhhamadali.blogspot.playingwithbitmaps;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.Menu;
import android.widget.ImageView;

public class Main extends Activity {
    ImageView imViewAndroid;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imViewAndroid = (ImageView) findViewById(R.id.imViewAndroid);
          Bitmap b=replaceColor(BitmapFactory.decodeResource(getResources(), R.drawable.basic),Color.YELLOW,Color.MAGENTA);
  imViewAndroid.setImageBitmap(b);
  
 }
 public Bitmap replaceColor(Bitmap src,int fromColor, int targetColor) {
        if(src == null) {
            return null;
        }
     // Source image size 
        int width = src.getWidth();
        int height = src.getHeight();
        int[] pixels = new int[width * height];
        //get pixels
        src.getPixels(pixels, 0, width, 0, 0, width, height);
 
        for(int x = 0; x < pixels.length; ++x) {
            pixels[x] = (pixels[x] == fromColor) ? targetColor : pixels[x];
        }
     // create result bitmap output 
        Bitmap result = Bitmap.createBitmap(width, height, src.getConfig());
        //set pixels
        result.setPixels(pixels, 0, width, 0, 0, width, height);
 
        return result;
    }
}

3. note that:

• With the help of this,replaceColor() method you can Replace the color of image on image on click,on action_down,on the fly etc.
• You can cut the required area of image by changing their color into Color.Transparent.

4. conclusion:

• Some information about Color Replacement.
• Know how to Replace image bitmap colors from drawables.

5. About the post:

•  The code seems to explain itself due to comments, and is very easy to understand.
•  Don’t mind to write a comment whatever you like to ask, to know,to suggest or recommend.
•  Hope you enjoy it!

6. Source Code:

        you can download the source code here

Cheers,

Hamad Ali Shaikh