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Christmas Wishes

The eventful year is now drawing to a close. Christmas time gives us an opportunity to reflect on the past and draw strength for the future.
We thank you for the trust you have shown in us, for your loyalty as well as the pleasant cooperation.
We wish you and your family a very Merry Christmas and success and happiness for the forthcoming year.

Here we have, in the first example, a predefined list with colors:

We use a GridView with six columns. Within the rows and columns there is an ImageView defined, which background color will be set using imageView.setBackgroundColor(colorList.get(position));.

The layout of the GridView is defined in res/layout/color_picker.xml.

Look for the colors in ColorPickerAdapter.java, which are placed in an array (for better reading).

// for convenience and better reading, we place the colors in a two dimension array
String colors[][] = { { "822111", "AC2B16", "CC3A21", "E66550", "EFA093", "F6C5BE" },
		{ "A46A21", "CF8933", "EAA041", "FFBC6B", "FFD6A2", "FFE6C7" },
		{ "AA8831", "D5AE49", "F2C960", "FCDA83", "FCE8B3", "FEF1D1" },
		{ "076239", "0B804B", "149E60", "44B984", "89D3B2", "B9E4D0" },
		{ "1A764D", "2A9C68", "3DC789", "68DFA9", "A0EAC9", "C6F3DE" },
		{ "1C4587", "285BAC", "3C78D8", "6D9EEB", "A4C2F4", "C9DAF8" },
		{ "41236D", "653E9B", "8E63CE", "B694E8", "D0BCF1", "E4D7F5" },
		{ "83334C", "B65775", "E07798", "F7A7C0", "FBC8D9", "FCDEE8" },
		{ "000000", "434343", "666666", "999999", "CCCCCC", "EFEFEF" } };
 
colorList = new ArrayList();
 
// add the color array to the list
for (int i = 0; i < colors.length; i++) {
	for (int j = 0; j < colors[i].length; j++) {
		colorList.add(Color.parseColor("#" + colors[i][j]));
	}
}

In the next step we will assign the Adapter to the GridView:

GridView gridViewColors = (GridView) findViewById(R.id.gridViewColors);
gridViewColors.setAdapter(new ColorPickerAdapter(getContext()));

The second example shows a Rainbow-Color-Picker where the number of colors is flexible:

Define the rainbow with the following steps::

// FF 00 00 --> FF FF 00
for (red = 255, green = 0, blue = 0; green <= 255; green += step)
    colorList.add(Color.rgb(red, green, blue));
 
// FF FF 00 --> 00 FF 00
for (red = 255, green = 255, blue = 0; red >= 0; red -= step)
    colorList.add(Color.rgb(red, green, blue));
 
// 00 FF 00 --> 00 FF FF
for (red = 0, green = 255, blue = 0; blue <= 255; blue += step)
    colorList.add(Color.rgb(red, green, blue));
 
// 00 FF FF -- > 00 00 FF
for (red = 0, green = 255, blue = 255; green >= 0; green -= step)
    colorList.add(Color.rgb(red, green, blue));
 
// 00 00 FF --> FF 00 FF
for (red = 0, green = 0, blue = 255; red <= 255; red += step)
    colorList.add(Color.rgb(red, green, blue));
 
// FF 00 FF -- > FF 00 00
for (red = 255, green = 0, blue = 255; blue >= 0; blue -= 256 / step)
    colorList.add(Color.rgb(red, green, blue));

Layout tipps

Right now the layout is only optimized for hdpi devices. Looking at a ldpi device (small screen) we get the following screen:

We have to adjust the GridView column width in order to have the desired layout on various screens. Creating the file res\values-small\strings.xml and setting the width with colorGridColumnWidth will solve the problem:

Download Eclipse Project Android Color Picker

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