I am creating an app, with resources that can be reused (because buttons are always the same, but mirrored or rotated). I do want to use the same resource so I don't have to add 3 more resources that are exactly like the original but rotated. But I also don't want to mix the code with things that can be declared in the XML or make transformations with a matrix that will cost processing time.
I've got a two state button declared in an XML.
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"
android:drawable="@drawable/and_card_details_button_down_left_onclick" /> <!-- pressed -->
<item android:drawable="@drawable/and_card_details_button_down_left" /> <!-- default -->
</selector>
and I want to reuse the drawable because it will be the same but rotated 90o and 45o and I assign to the button as a drawable.
<Button android:id="@+id/Details_Buttons_Top_Left_Button"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/details_menu_large_button" />
I know that I can rotate it with a RotateDrawable
or with a Matrix
but as I already explained I don't like that approach.
Is it possible to achieve that directly on the XML or what do you think that will be the best way to do it? Put all resources but rotated, rotate them in the code?
--- EDIT ---
The answer of @dmaxi works great, this is how to combine it with an item list :)
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<rotate
android:fromDegrees="90"
android:toDegrees="90"
android:pivotX="50%"
android:pivotY="50%"
android:drawable="@drawable/and_card_details_button_up_onclick"/>
</item>
<item>
<rotate
android:fromDegrees="90"
android:toDegrees="90"
android:pivotX="50%"
android:pivotY="50%"
android:drawable="@drawable/and_card_details_button_up_onclick"/>
</item>
</selector>
See Question&Answers more detail:
os 与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…