Develop Reference

Change color of an image in android

I wonder if there is a way to change the color of my image on the button easily,
my simple example is like this,
CircleButton.setImageResource(android.R.drawable.ic_media_play);
I have a play audio icon (white) and want to change the icon color to red, like this
CircleButton.setImageResource(ColorChange(Red, android.R.drawable.ic_media_play));
What seems to be the easiest way for doing ColorChange() ?

Use ColorFilter to change the button image color. Your button should be ImageButton
Set the image resource to the ImageButton
CircleButton.setImageResource(android.R.drawable.ic_media_play);
And, change the image color when required like this
CircleButton.setColorFilter(getResources().getColor(R.color.any_color));
Refer : http://developer.android.com/reference/android/graphics/drawable/Drawable.html#setColorFilter(android.graphics.ColorFilter)

android change view's background color when state changes

how to use color state list for background?
I know android:background="#drawable/drawable_selector", but android:background="#color/color_selector" will cause exceptions.
but android:background="#FFFFFF" works again, can anyone explains why?
now i want to change a layout's background color(not a drawable) when it's pressed,
how to do it?

dynamically you can change like this. Use this if it is useful for you -
textView.setBackgroundColor(Color.parseColor(getResources().getString(R.string.red)));

put the color in res/values/colors.xml,
like #FFFFFF,
and then create a drawable xml in drawable directory,
,that is ok.

How to use setTextColor for Android Radio Buttons?

I am trying to change the text color of a RadioButton (which is
defined in an xml layout and is in a RadioGroup) on selecting it.
When I change the text color directly in the Eclipse Android Layout
Editor by setting the TextColor property to "#color/red" (which I
defined in strings.xml), it works just fine, but when I try to do this
programmatically during runtime as
myRadioButton.setTextColor(R.color.red);
it only turns the color to grey, not to red as intended.
R.color.red (#color/red) is correctly defined as a hex value
("#FF0000"), but it does turn the text color to red in the
layout editor, but not via a Java command.

if your color.xml is like:
<color name="errorColor">#f00</color>
and then use this code to show it:
myRadioButton.setTextColor(getResources().getColor(R.color.red));

there are some other ways to do so
myRadioButton.setTextColor(Color.RED);
or
myRadioButton.setTextColor(Color.rgb(red, green, blue));
// where red green and blue are the int values
edited if you want to get from resources then use
getResources().getColor(R.color.red) ;

Color change of a button in code not reflecting

I'm trying to change a color of a button in code as below
btn_no5.setTextColor(0x8E35EF);
the above change is not reflecting(purple color), the text is disappearing after execution of above piece of code. But if i use the color in xml its reflecting. So how to change this through java ?

The color you are using is fully transparent. Use 0xFF8E35EF instead. The first byte is the alpha (transparency) channel.

use like this,
btn_no5.setTextColor(Color.parseColor("#8E35EF"));

How to set AutoCompleteTextView drop down background to transparent in Android?

As the subject suggests , how to set the transparent background to AutoCompleteTextView dropdown. I can apply any style to the view(TextView) that dropdown box shows but to make the drop down itself transparent I am not able to do !
Any hints or solution ?
Thanks

set android:popupBackground to #0FFF in xml

Thanks , got what I was looking for ,
I can change background image of dropdown using
setDropDownBackgroundResource();
and set semi-transparent png.

You have two options:
XML Attribute:
android:popupBackground
The background to use for the popup window.
May be a color value, in the form of "#rgb", "#argb", "#rrggbb", or "#aarrggbb".
Java Attribute
setDropDownBackgroundResource
Sets the background of the auto-complete drop-down list.