[android] How to get a Color from hexadecimal Color String

I'd like to use a color from an hexa string such as "#FFFF0000" to (say) change the background color of a Layout. Color.HSVToColor looks like a winner but it takes a float[] as a parameter.

Am I any close to the solution at all?

For shortened Hex code

int red = colorString.charAt(1) == '0' ? 0 : 255;
int blue = colorString.charAt(2) == '0' ? 0 : 255;
int green = colorString.charAt(3) == '0' ? 0 : 255;
Color.rgb(red, green,blue);

Try this:

vi.setBackgroundColor(Color.parseColor("#FFFF0000"));

There is no pre-defined class to implement directly from hex code to color name so what you have to do is Try key value pair concept simple, follow this code.

String hexCode = "Any Hex code" //#0000FF

HashMap<String, String> color_namme = new HashMap<String, String>();
                        color_namme.put("#000000", "Black");
                        color_namme.put("#000080", "Navy Blue");
                        color_namme.put("#0000C8", "Dark Blue");
                        color_namme.put("0000FF", "Blue");
                        color_namme.put("000741", "Stratos");
                        color_namme.put("001B1C", "Swamp");
                        color_namme.put("002387", "Resolution Blue");
                        color_namme.put("002900", "Deep Fir");
                        color_namme.put("002E20", "Burnham");
                        for (Map.Entry<String, String> entry : color_namme.entrySet()) {
                            String key = (String) entry.getKey();
                            String thing = (String) entry.getValue();
                            if (hexCode.equals(key))
                                Color_namme.setText(thing); //Here i display using textview


                        }

I use this and it works great for me for setting any color I want.

public static final int MY_COLOR = Color.rgb(255, 102, 153);

Set the colors using 0-255 for each red, green and blue then anywhere you want that color used just put MY_COLOR instead of Color.BLUE or Color.RED or any of the other static colors the Color class offers.

Just do a Google search for color chart and it you can find a chart with the correct RGB codes using 0-255.

Try:

myLayout.setBackgroundColor(Color.parseColor("#636161"));

It's

int color =  Color.parseColor("colorstring");

XML file saved at res/values/colors.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <color name="opaque_red">#f00</color>
   <color name="translucent_red">#80ff0000</color>
</resources>

This application code retrieves the color resource:

Resources res = getResources();
int color = res.getColor(R.color.opaque_red);

This layout XML applies the color to an attribute:

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:textColor="@color/translucent_red"
    android:text="Hello"/>

If you define a color in your XML and want to use it to change background color or something this API is the one your are looking for:

 ((TextView) view).setBackgroundResource(R.drawable.your_color_here);

In my sample I used it for TestView

This question comes up for a number of searches related to hex color so I will add a summary here.

Color from int

Hex colors take the form RRGGBB or AARRGGBB (alpha, red, green, blue). In my experience, when using an int directly, you need to use the full AARRGGBB form. If you only have the RRGGBB form then just prefix it with FF to make the alpha (transparency) fully opaque. Here is how you would set it in code. Using 0x at the beginning means it is hexadecimal and not base 10.

int myColor = 0xFF3F51B5;
myView.setBackgroundColor(myColor);

Color from String

As others have noted, you can use Color.parseColor like so

int myColor = Color.parseColor("#3F51B5");
myView.setBackgroundColor(myColor);

Note that the String must start with a #. Both RRGGBB and AARRGGBB formats are supported.

Color from XML

You should actually be getting your colors from XML whenever possible. This is the recommended option because it makes it much easier to make color changes to your app. If you set a lot of hex colors throughout your code then it is a big pain to try to change them later.

Android material design has color palates with the hex values already configured.

• Material Design color styling
• Material Design color palette generator

These theme colors are used throughout your app and look like this:

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <color name="primary">#3F51B5</color>
  <color name="primary_dark">#303F9F</color>
  <color name="primary_light">#C5CAE9</color>
  <color name="accent">#FF4081</color>
  <color name="primary_text">#212121</color>
  <color name="secondary_text">#757575</color>
  <color name="icons">#FFFFFF</color>
  <color name="divider">#BDBDBD</color>
</resources>

If you need additional colors, a good practice to follow is to define your color in two steps in xml. First name the the hex value color and then name a component of your app that should get a certain color. This makes it easy to adjust the colors later. Again, this is in colors.xml.

<color name="orange">#fff3632b</color>
<color name="my_view_background_color">@color/orange</color>

Then when you want to set the color in code, do the following:

int myColor = ContextCompat.getColor(context, R.color.my_view_background_color);    
myView.setBackgroundColor(myColor);

Android Predefined colors

The Color class comes with a number of predefined color constants. You can use it like this.

int myColor = Color.BLUE;
myView.setBackgroundColor(myColor);

Other colors are

• Color.BLACK
• Color.BLUE
• Color.CYAN
• Color.DKGRAY
• Color.GRAY
• Color.GREEN
• Color.LTGRAY
• Color.MAGENTA
• Color.RED
• Color.TRANSPARENT
• Color.WHITE
• Color.YELLOW

Notes

• A quick way to find hex colors is to open the color chooser dialog in Gimp (or some other photo editing software).
• Standard opacity levels in Material Design

Convert that string to an int color which can be used in setBackgroundColor and setTextColor

String string = "#FFFF0000";
int color = Integer.parseInt(string.replaceFirst("^#",""), 16);

The 16 means it is hexadecimal and not your regular 0-9. The result should be the same as

int color = 0xFFFF0000;

In Xamarin Use this

Control.SetBackgroundColor(global::Android.Graphics.Color.ParseColor("#F5F1F1"));

Try using 0xFFF000 instead and pass that into the Color.HSVToColor method.