Android ImageView set image according to tag

Issue

I was wondering if there was any way in Android to set an ImageView's image dynamically by using its tag.

Ideally it would be like this:

// image_view_style.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:tag="1"
        android:drawable="@drawable/image_for_tag_1"/>
  <item android:tag="2"
        android:drawable="@drawable/image_for_tag_2"/>
  <item android:tag="3"
        android:drawable="@drawable/image_for_tag_3"/>
</selector>

And simply calling the ImageView's setTag() method with the value I want.

I tried this but it doesn't work. Is there any clean way to do the image selection in the resource file (for something else than state_selected, state_pressed, etc) ?

Solution

I think you can use LevelListDrawable to achieve what you want:

https://developer.android.com/reference/android/graphics/drawable/LevelListDrawable.html

From the documentation:

<level-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:maxLevel="0" android:drawable="@drawable/ic_wifi_signal_1" />
<item android:maxLevel="1" android:drawable="@drawable/ic_wifi_signal_2" />
<item android:maxLevel="2" android:drawable="@drawable/ic_wifi_signal_3" />
<item android:maxLevel="3" android:drawable="@drawable/ic_wifi_signal_4" />
</level-list>

then use setLevel(...) in code to set a level.

Answered By - Goddchen