Android: Make Specific (green) Color In Background Image Transparent
i am writing an app for Android. in an xml file defining layout I have a TabHost with 6 Tabs, which all have the same big background image 'settingsdlg.gif'.
Solution 1:
You would have to change every green pixel into a transparent one. Here is an example: How to change colors of a Drawable in Android?
However if there are green pixels in the middle of the image then you can have a problem. So the other way is, if your image has constant size and shape, to create a mask and use xfer modes to create a new image with transparent rounded corners.
Solution 2:
Just if anyone had the same problem, here is the code:
//remove green edges from bg imageBitmapbgBitmap= ((BitmapDrawable)getResources().getDrawable(R.drawable.settingsdlg)).getBitmap();
BitmaptransparentBgBitmap= Utils.getBitmapWithTransparentBG(bgBitmap, Color.GREEN);
tabHost.setBackgroundDrawable(newBitmapDrawable(transparentBgBitmap));
in Utils:
publicstatic Bitmap getBitmapWithTransparentBG(Bitmap srcBitmap, int bgColor) {
Bitmapresult= srcBitmap.copy(Bitmap.Config.ARGB_8888, true);
intnWidth= result.getWidth();
intnHeight= result.getHeight();
for (inty=0; y < nHeight; ++y)
for (intx=0; x < nWidth; ++x) {
intnPixelColor= result.getPixel(x, y);
if (nPixelColor == bgColor)
result.setPixel(x, y, Color.TRANSPARENT);
}
return result;
}
Solution 3:
This code snippet worked for me:
PorterDuffColorFilterporterDuffColorFilter=newPorterDuffColorFilter(
getResources().getColor(R.color.your_color),
PorterDuff.Mode.MULTIPLY
);
imgView.getDrawable().setColorFilter(porterDuffColorFilter);
imgView.setBackgroundColor(Color.TRANSPARENT);
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