Animate selector/state transitions

Question

I have a simple selector for my ListView

Answer 1

The modern way (since api 21) of doing it with example:

 <?xml version="1.0" encoding="utf-8"?>
<animated-selector xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/checked"
        android:drawable="@drawable/check_box_on"
        app:check="true" />  <!-- this is custom state. You can use android:state_checked="true"-->
    <item
        android:id="@+id/unchecked"
        android:drawable="@drawable/check_box_off"
        app:check="false" />
    <transition
        android:drawable="@drawable/toggle_checkbox_unchecked_checked"
        android:fromId="@+id/unchecked"
        android:toId="@+id/checked" />
    <transition
        android:drawable="@drawable/toggle_checkbox_checked_unchecked"
        android:fromId="@+id/checked"
        android:toId="@+id/unchecked" />
</animated-selector>

documentation for animated-selector: link

where transition drawable is for example this:

<?xml version="1.0" encoding="utf-8"?>
<animated-vector xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:aapt="http://schemas.android.com/aapt"
    android:drawable="@drawable/check_box_on">
    <target android:name="check_box_on_path">
        <aapt:attr name="android:animation">
            <objectAnimator
                android:duration="@android:integer/config_shortAnimTime"
                android:interpolator="@android:interpolator/decelerate_cubic"
                android:propertyName="trimPathEnd"
                android:valueFrom="1"
                android:valueTo="0"
                android:valueType="floatType" />
        </aapt:attr>
    </target>
</animated-vector>

documentation for animated-vector: link

Answer 2

Is it the fade you want?

I guess it would be the same as how a textSwitcher works, maybe you want to change it to a ViewSwitcher instead, the fade is done pro-grammatically

---

Animation in = AnimationUtils.loadAnimation(this,
                android.R.anim.fade_in);
        Animation out = AnimationUtils.loadAnimation(this,
                android.R.anim.fade_out);

        mSwitcher1.setInAnimation(in);
        mSwitcher1.setOutAnimation(out); 

---

Answer 3

I guess TransitionDrawable could help you to accomplish this.

You can check the answer here: Animate change of view background color on Android

Answer 4

Added in api 21 "StateListAnimator"

http://developer.android.com/reference/android/animation/StateListAnimator.html

I know this is an old question but this may help future people looking to do this.