I'm attempting to change the background color of an Android TextView
widget when the user touches it. I've created a selector for that purpose, which is stored in res/color/selector.xml
and roughly looks like that:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_pressed="true"
android:color="@color/semitransparent_white"
/>
<item
android:color="@color/transparent"
/>
</selector>
The clickable
attribute of the TextView
is true
, in case that's of interest.
When I assign this selector to a TextView
as android:background="@color/selector"
, I'm getting the following exception at runtime:
ERROR/AndroidRuntime(13130): Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML file line #6: tag requires a 'drawable' attribute or child tag defining a drawable
When I change the attribute to drawable, it works, but the result is looking completely wrong because the IDs appear to be interpreted as image references instead of color references (as the "drawable" suggests).
What confuses me is that I can set a color reference, e.g. "@color/black", as the background attribute directly. This is working as expected. Using selectors doesn't work.
I can also use the selector as the textColor
without problems.
What's the correct way to apply a background-color-selector to a TextView
in Android?
This question is related to
android
Benoit's solution works, but you really don't need to incur the overhead to draw a shape. Since colors can be drawables, just define a color in a /res/values/colors.xml file:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="semitransparent_white">#77ffffff</color>
</resources>
And then use as such in your selector:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_pressed="true"
android:drawable="@color/semitransparent_white" />
</selector>
An even simpler solution to the above:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<color android:color="@color/semitransparent_white" />
</item>
<item>
<color android:color="@color/transparent" />
</item>
</selector>
Save that in the drawable folder and you're good to go.
Even this works.
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="@color/dim_orange_btn_pressed" />
<item android:state_focused="true" android:drawable="@color/dim_orange_btn_pressed" />
<item android:drawable="@android:color/white" />
</selector>
I added the android:drawable
attribute to each item, and their values are colors.
By the way, why do they say that color
is one of the attributes of selector
? They don't write that android:drawable
is required.
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:color="hex_color"
android:state_pressed=["true" | "false"]
android:state_focused=["true" | "false"]
android:state_selected=["true" | "false"]
android:state_checkable=["true" | "false"]
android:state_checked=["true" | "false"]
android:state_enabled=["true" | "false"]
android:state_window_focused=["true" | "false"] />
</selector>
For who is searching to do it without creating a background sector, just add those lines to the TextView
android:background="?android:attr/selectableItemBackground"
android:clickable="true"
Also to make it selectable use:
android:textIsSelectable="true"
Source: Stackoverflow.com