为什么在使用stateListAnimator属性时单击效果会消失？

View view = findViewById(R.id.your_view_id);
if (view.getAnimation() != null) {
    view.getAnimation().cancel();
}

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@drawable/pressed_animation" />
    <item android:state_focused="true" android:drawable="@drawable/focused_animation" />
    <item android:drawable="@drawable/default_animation" />
</selector>

View view = findViewById(R.id.your_view_id);
view.setStateListAnimator(new StateListAnimator());

View view = findViewById(R.id.your_view_id);
if (view.getParent() != null) {
    Log.d("View Hierarchy", view.getParent().toString());
}

android {
    defaultConfig {
        minSdkVersion 21
    }
}