I don't actually know how these matrices work

customColorArray.java

String bg = sharedPreferences.getString("bg", "#FF000000");
int[] bgc = Util.fromColor(bg);
float[] sCustomColorArray = {
1.0f,      0,      0,       0,      bgc[1], // red
0,      1.0f,      0,       0,      bgc[2], // green
0,         0,   1.0f,       0,      bgc[3], // blue
0,         0,      0,    1.0f,      bgc[0]  // alpha
};
mDefaultFilter = sCustomColorArray;