android.view.View#setStateListAnimator ( )源码实例Demo

private static void setViewStateListAnimator(View view, ViewNodeInfo viewNodeInfo) {
  StateListAnimator stateListAnimator = viewNodeInfo.getStateListAnimator();
  final int stateListAnimatorRes = viewNodeInfo.getStateListAnimatorRes();
  if (stateListAnimator == null && stateListAnimatorRes == 0) {
    return;
  }
  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
    throw new IllegalStateException(
        "MountState has a ViewNodeInfo with stateListAnimator, "
            + "however the current Android version doesn't support stateListAnimator on Views");
  }
  if (stateListAnimator == null) {
    stateListAnimator =
        AnimatorInflater.loadStateListAnimator(view.getContext(), stateListAnimatorRes);
  }
  view.setStateListAnimator(stateListAnimator);
}
 

/**
 * 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);
}
 

static void setStateListAnimatorFromAttrs(
    @NonNull View view, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
  final Context context = view.getContext();
  final TypedArray a =
      ThemeEnforcement.obtainStyledAttributes(
          context, attrs, STATE_LIST_ANIM_ATTRS, defStyleAttr, defStyleRes);
  try {
    if (a.hasValue(0)) {
      StateListAnimator sla =
          AnimatorInflater.loadStateListAnimator(context, a.getResourceId(0, 0));
      view.setStateListAnimator(sla);
    }
  } finally {
    a.recycle();
  }
}
 

/** 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);
}
 

private static void unsetViewStateListAnimator(View view, ViewNodeInfo viewNodeInfo) {
  if (viewNodeInfo.getStateListAnimator() == null
      && viewNodeInfo.getStateListAnimatorRes() == 0) {
    return;
  }
  if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
    throw new IllegalStateException(
        "MountState has a ViewNodeInfo with stateListAnimator, "
            + "however the current Android version doesn't support stateListAnimator on Views");
  }
  view.setStateListAnimator(null);
}
 

static void setStateListAnimatorFromAttrs(View view, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    final Context context = view.getContext();
    final TypedArray a = context.obtainStyledAttributes(attrs, STATE_LIST_ANIM_ATTRS,
            defStyleAttr, defStyleRes);
    try {
        if (a.hasValue(0)) {
            StateListAnimator sla = AnimatorInflater.loadStateListAnimator(context, a.getResourceId(0, 0));
            view.setStateListAnimator(sla);
        }
    } finally {
        a.recycle();
    }
}
 

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public static void setupRaiflat(View view) {
    StateListAnimator stateListAnimator
            = AnimatorInflater.loadStateListAnimator(view.getContext(),
            R.drawable.raiflatbutton_statelistanimator);
    view.setStateListAnimator(stateListAnimator);
}
 

@Override
public void setStateListAnimator(View view, StateListAnimator stateListAnimator) {
    view.setStateListAnimator(stateListAnimator);
}
 

@Override
public void setStateListAnimator(View view, int id) {
    view.setStateListAnimator(AnimatorInflater.loadStateListAnimator(view.getContext(), id));
}