I have spent more than 10 hours trying to get the animation of the switch to work.
I have tried so many things that I don't remember several of the attempts, but I'll explain those that I remember.
Code that should work (I think):
I use the widgetLayout parameter:
<CheckBoxPreference
android:defaultValue="false"
android:key="asd"
android:title="@string/asd"
android:widgetLayout="@layout/switchcompat_for_settings">
switchcompat_for_settings:
<android.support.v7.widget.SwitchCompat
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/checkbox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@null"
android:clickable="false"
android:focusable="false"
android:gravity="center"
/>
No animation.
Extending SwitchCompat with this code (best attempt??): https://gist.github.com/antifriz/ad4412b72d50f63ec977
Going from false to true there is an animation, going from true to false there is no animation.
Non ideal behaviour (but acceptable, if it can't be prevented): if the value is true it plays animation when the activity is loaded.
Extending with following code:
Extending Preference classes in Android Lollipop = losing animation
No animation at all.
@Override
public boolean isShown() {
return getVisibility() == VISIBLE;
}
Using SwitchPreference:
Before Lollipop it has the old view, so not ideal because I would need different xml for before Lollipop and after. If I have only one SwitchPreference I still have no animation. With several consecutive SwitchPreferences I get an animation in all but one (I've also checked with a new project with the Settings template and same problem).
Also, I prefer no animation in any Preference than animation in all but one.
Adding a second Switch:
In switchcompat_for_settings I add a second SwitchCompat and set the one with id=@android:id/checkbox to invisible. I extend the CheckboxPreference to override onBindView, and after calling super.onBindView I find the extra SwitchCompat and call setChecked to the appropriate value.
In the onPreferenceClick I call the setChecked of my extra switch.
It toggles without animation. My understanding is that the problem is that as onBindView is called A LOT of times (when creating the preference, and also each time I toggle it), it cancels the animation.
I tried to add a boolean to call setChecked in onBindView only after being called from onClick but did not succeed. Maybe it is the way to go and I did something wrong.
Only remaining idea (not willing to do this): Add the switch manually to the activity root view, place in the correct position and handle from each activity that has this preference (several).
