如何正确设置像素到Android中的位图？

Question

I want to save a pixelarray to a Bitmap. I got everything working except: my app saves the bitmap, but the colors are a little bit different as they are in my array.

This is how I save the colors array:

Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
bitmap.setPixels(colors, 0, width, 0, 0, width, height);
OutputStream out = null;
File file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getParent(), "new.png");
try {
    file.createNewFile();
    out = new FileOutputStream(file);
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
    out.flush();
    out.close();
    MediaStore.Images.Media.insertImage(getContentResolver(), file.getAbsolutePath(), file.getName(), file.getName());
} catch (Exception e) {
    e.printStackTrace();
}

This is how I set a color to a pixel in the array:

colors[0] = 0x287026;

What goes wrong? The compression to a PNG and store it into my documents? Because when I go to my documents on my phone and check the new PNG created, it's a little bit blurry. Or is this bit of code wrong: Bitmap.Config.RGB_565? Do I need to use ARGB instead of just RGB?

Hope someone is able to help me! :)
Any help is appreciated!

Joeri

Answer 1

Colors are encoded ints, and they can include the alpha channel. I suspect your colors do include the alpha channel so you are using ARGB colors when your Bitmap format calls for RGB. Change your image format to ARGB_8888 which is the default and recommended format.