android：如何禁用开关动画？

Question

Recently,I am using the widget named switch. The switch is default widget of Android Studio.The problem is that when I add new Item with switch,its animation will run but I don't want to see it. I used ListView and Cursor Adapter in my project.And the switch is a item as an element of ListView. Do you know how to solve it?

Answer 1

如果在开关上调用setChecked()后立即调用jumpDrawablesToCurrentState()将禁用动画。

Answer 2

This is a piece of code from Switch widget (you can see it too - just press Ctrl and click Switch in your Android Studio project window):

@Override
public void setChecked(boolean checked) {
    super.setChecked(checked);

    // Calling the super method may result in setChecked() getting called
    // recursively with a different value, so load the REAL value...
    checked = isChecked();

    if (getWindowToken() != null && ViewCompat.isLaidOut(this) && isShown()) {
        animateThumbToCheckedState(checked);
    } else {
        // Immediately move the thumb to the new position.
        cancelPositionAnimator();
        setThumbPosition(checked ? 1 : 0);
    }
}

It will always show animation when visible. So you can't disable it. But you can extend CompoundButton class and make your own switch widget without any animation.

Also you can copy code from Switch widget, rename it, remove animation, make some drawables and you'll get a non-animated switch.

Answer 3

如果您有不需要的动画，当第一次显示Switch时，那么它可能会帮助您改用SwitchCompat 。

Answer 4

I was able to disable the animation of the switch by removing it from the view hierarchy, calling setChecked(val) while it's removed, and then readding it to the view hierarchy.

It's kludgey, but as far as I can tell it's the only way to do it -- you can't subclass Switch to override the setChecked() behavior because you still need to call super.setChecked() which will run Switch#setChecked() and do the animation anyway.