Changing the pixel color in android

Question

``` testButton.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { Bitmap mutableBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);for (int i = 0; i < mutableBitmap.getWidth(); i++) { for (int j = 0; j < mutableBitmap.getHeight(); j++) { int pixel = mutableBitmap.getPixel(i, j); // get red color value int red = Color.red(pixel); int color = Color.argb(0xFF, red, 0, 0); mutableBitmap.setPixel(i, j, color); imageView.setImageBitmap(mutableBitmap); } } } }); ``` I am trying to change the pixel color with only red value. Therefore i get the red value from a given pixel and then tried to replace the same pixel with only that red value. The program runs successfully but when i click the button it crashes out. Can anyone tell me what i am doing wrong LOGCAT error ``` 12-03 15:16:57.228: E/AndroidRuntime(5103): FATAL EXCEPTION: main 12-03 15:16:57.228: E/AndroidRuntime(5103): java.lang.IllegalStateException 12-03 15:16:57.228: E/AndroidRuntime(5103): at…

Accepted Answer

You are trying to modify pixels of a Immutable bitmap.You can not modify the pixels of a immutable Bitmap. if you try it will throw IllegalStateException.

use below method to get Mutable Bitmap from Resources

```
public static Bitmap getMutableBitmap(Resources resources,int resId) {
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inMutable = true;
    return BitmapFactory.decodeResource(resources, resId, options);
}
```

or use

```
    Bitmap mutableBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
```

to get mutable Bitmap from immutable bitmap

Changing the pixel color in android

Solution

Problem