Java Code Examples for android.animation.StateListAnimator#addState()

/**
 * Creates and sets a {@link StateListAnimator} with a custom elevation value
 */
@SuppressLint("PrivateResource")
static void setDefaultAppBarLayoutStateListAnimator(final View view, final float targetElevation) {
    final StateListAnimator sla = new StateListAnimator();

    // Enabled, collapsible and collapsed == elevated
    sla.addState(new int[]{android.R.attr.enabled, R.attr.state_collapsible, R.attr.state_collapsed},
            ObjectAnimator.ofFloat(view, "elevation", targetElevation));

    // Enabled and collapsible, but not collapsed != elevated
    sla.addState(new int[]{android.R.attr.enabled, R.attr.state_collapsible, -R.attr.state_collapsed},
            ObjectAnimator.ofFloat(view, "elevation", 0f));

    // Enabled but not collapsible == elevated
    sla.addState(new int[]{android.R.attr.enabled, -R.attr.state_collapsible},
            ObjectAnimator.ofFloat(view, "elevation", targetElevation));

    // Default, none elevated state
    sla.addState(new int[0], ObjectAnimator.ofFloat(view, "elevation", 0));

    view.setStateListAnimator(sla);
}
 

/** Creates and sets a {@link StateListAnimator} with a custom elevation value */
static void setDefaultAppBarLayoutStateListAnimator(
    @NonNull final View view, final float elevation) {
  final int dur = view.getResources().getInteger(R.integer.app_bar_elevation_anim_duration);

  final StateListAnimator sla = new StateListAnimator();

  // Enabled and liftable, but not lifted means not elevated
  sla.addState(
      new int[] {android.R.attr.enabled, R.attr.state_liftable, -R.attr.state_lifted},
      ObjectAnimator.ofFloat(view, "elevation", 0f).setDuration(dur));

  // Default enabled state
  sla.addState(
      new int[] {android.R.attr.enabled},
      ObjectAnimator.ofFloat(view, "elevation", elevation).setDuration(dur));

  // Disabled state
  sla.addState(new int[0], ObjectAnimator.ofFloat(view, "elevation", 0).setDuration(0));

  view.setStateListAnimator(sla);
}
 

@RequiresApi(api = VERSION_CODES.LOLLIPOP)
public static StateListBuilder<Animator, StateListAnimator> animatorBuilder() {
    return new StateListBuilder<Animator, StateListAnimator>() {
        @Override
        public StateListAnimator build() {
            StateListAnimator drawable = new StateListAnimator();
            int[][] states = getStates();
            Animator[] values = getValues(new Animator[this.values.size()]);
            for (int i = 0; i < states.length; i++) {
                drawable.addState(states[i], values[i]);
            }
            return drawable;
        }
    };
}
 

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void setupStateListAnimator() {
    mFlatStateListAnimator = new StateListAnimator();

    ObjectAnimator pressed = ObjectAnimator.ofFloat(this, "elevation", 0)
            .setDuration(mView.getContext().getResources()
                    .getInteger(android.R.integer.config_shortAnimTime));

    ObjectAnimator notPressed = ObjectAnimator.ofFloat(this, "elevation", mView.getElevation()
            + mView.getTranslationZ()).setDuration(mView.getContext().getResources()
            .getInteger(android.R.integer.config_shortAnimTime));


    notPressed.setStartDelay(100);

    mFlatStateListAnimator.addState(new int[]{android.R.attr.state_pressed,
            android.R.attr.state_enabled}, pressed);

    mFlatStateListAnimator.addState(new int[]{android.R.attr.state_enabled}, notPressed);

    mFlatStateListAnimator.addState(new int[]{},
            ObjectAnimator.ofFloat(this, "elevation", 0).setDuration(0));

    mView.setStateListAnimator(mFlatStateListAnimator);
}
 

@Override
void onElevationsChanged(
    final float elevation,
    final float hoveredFocusedTranslationZ,
    final float pressedTranslationZ) {

  if (Build.VERSION.SDK_INT == VERSION_CODES.LOLLIPOP) {
    // Animations produce NPE in version 21. Bluntly set the values instead in
    // #onDrawableStateChanged (matching the logic in the animations below).
    view.refreshDrawableState();
  } else {
    final StateListAnimator stateListAnimator = new StateListAnimator();

    // Animate elevation and translationZ to our values when pressed, focused, and hovered
    stateListAnimator.addState(
        PRESSED_ENABLED_STATE_SET, createElevationAnimator(elevation, pressedTranslationZ));
    stateListAnimator.addState(
        HOVERED_FOCUSED_ENABLED_STATE_SET,
        createElevationAnimator(elevation, hoveredFocusedTranslationZ));
    stateListAnimator.addState(
        FOCUSED_ENABLED_STATE_SET,
        createElevationAnimator(elevation, hoveredFocusedTranslationZ));
    stateListAnimator.addState(
        HOVERED_ENABLED_STATE_SET,
        createElevationAnimator(elevation, hoveredFocusedTranslationZ));

    // Animate translationZ to 0 if not pressed, focused, or hovered
    AnimatorSet set = new AnimatorSet();
    List<Animator> animators = new ArrayList<>();
    animators.add(ObjectAnimator.ofFloat(view, "elevation", elevation).setDuration(0));
    if (Build.VERSION.SDK_INT >= 22 && Build.VERSION.SDK_INT <= 24) {
      // This is a no-op animation which exists here only for introducing the duration
      // because setting the delay (on the next animation) via "setDelay" or "after"
      // can trigger a NPE between android versions 22 and 24 (due to a framework
      // bug). The issue has been fixed in version 25.
      animators.add(
          ObjectAnimator.ofFloat(view, View.TRANSLATION_Z, view.getTranslationZ())
              .setDuration(ELEVATION_ANIM_DELAY));
    }
    animators.add(
        ObjectAnimator.ofFloat(view, View.TRANSLATION_Z, 0f)
            .setDuration(ELEVATION_ANIM_DURATION));
    set.playSequentially(animators.toArray(new Animator[0]));
    set.setInterpolator(ELEVATION_ANIM_INTERPOLATOR);
    stateListAnimator.addState(ENABLED_STATE_SET, set);

    // Animate everything to 0 when disabled
    stateListAnimator.addState(EMPTY_STATE_SET, createElevationAnimator(0f, 0f));

    view.setStateListAnimator(stateListAnimator);
  }

  if (shouldAddPadding()) {
    updatePadding();
  }
}