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?
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?
Try Color
class method:
public static int parseColor (String colorString)
From Android documentation:
Supported formats are: #RRGGBB #AARRGGBB 'red', 'blue', 'green', 'black', 'white', 'gray', 'cyan', 'magenta', 'yellow', 'lightgray', 'darkgray'
AndroidX: String.toColorInt()
This question comes up for a number of searches related to hex color so I will add a summary here.
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);
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.
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.
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);
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
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.
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"/>
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
}