So I've set up toolbar to automaticly hide when user is scrolling the list on RecyclerView with this code:
public final class RecyclerViewUtils {
public static class ShowHideToolbarOnScrollingListener extends RecyclerView.OnScrollListener {
public static final String SHOW_HIDE_TOOLBAR_LISTENER_STATE = "show-hide-toolbar-listener-state";
// The elevation of the toolbar when content is scrolled behind
private static final float TOOLBAR_ELEVATION = 14f;
private Toolbar toolbar;
private State state;
public ShowHideToolbarOnScrollingListener(Toolbar toolbar) {
this.toolbar = toolbar;
this.state = new State();
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void toolbarSetElevation(float elevation) {
if (AndroidUtils.isLollipop()) {
toolbar.setElevation(elevation == 0 ? 0 : TOOLBAR_ELEVATION);
}
}
private void toolbarAnimateShow(final int verticalOffset) {
toolbar.animate()
.translationY(0)
.setInterpolator(new LinearInterpolator())
.setDuration(180)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
toolbarSetElevation(verticalOffset == 0 ? 0 : TOOLBAR_ELEVATION);
}
});
}
private void toolbarAnimateHide() {
toolbar.animate()
.translationY(-toolbar.getHeight())
.setInterpolator(new LinearInterpolator())
.setDuration(180)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
toolbarSetElevation(0);
}
});
}
@Override
public final void onScrollStateChanged(RecyclerView recyclerView, int newState) {
if (newState == RecyclerView.SCROLL_STATE_IDLE) {
if (state.scrollingOffset > 0) {
if (state.verticalOffset > toolbar.getHeight()) {
toolbarAnimateHide();
} else {
toolbarAnimateShow(state.verticalOffset);
}
} else if (state.scrollingOffset < 0) {
if (toolbar.getTranslationY() < toolbar.getHeight() * -0.6 && state.verticalOffset > toolbar.getHeight()) {
toolbarAnimateHide();
} else {
toolbarAnimateShow(state.verticalOffset);
}
}
}
}
@Override
public final void onScrolled(RecyclerView recyclerView, int dx, int dy) {
state.verticalOffset = recyclerView.computeVerticalScrollOffset();
state.scrollingOffset = dy;
int toolbarYOffset = (int) (dy - toolbar.getTranslationY());
toolbar.animate().cancel();
if (state.scrollingOffset > 0) {
if (toolbarYOffset < toolbar.getHeight()) {
if (state.verticalOffset > toolbar.getHeight()) {
toolbarSetElevation(TOOLBAR_ELEVATION);
}
toolbar.setTranslationY(state.translationY = -toolbarYOffset);
} else {
toolbarSetElevation(0);
toolbar.setTranslationY(state.translationY = -toolbar.getHeight());
}
} else if (state.scrollingOffset < 0) {
if (toolbarYOffset < 0) {
if (state.verticalOffset <= 0) {
toolbarSetElevation(0);
}
toolbar.setTranslationY(state.translationY = 0);
} else {
if (state.verticalOffset > toolbar.getHeight()) {
toolbarSetElevation(TOOLBAR_ELEVATION);
}
toolbar.setTranslationY(state.translationY = -toolbarYOffset);
}
}
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public void onRestoreInstanceState(State state) {
this.state.verticalOffset = state.verticalOffset;
this.state.scrollingOffset = state.scrollingOffset;
if (AndroidUtils.isLollipop()) {
toolbar.setElevation(state.elevation);
toolbar.setTranslationY(state.translationY);
}
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public State onSaveInstanceState() {
state.translationY = toolbar.getTranslationY();
if (AndroidUtils.isLollipop()) {
state.elevation = toolbar.getElevation();
}
return state;
}
/**
* Parcelable RecyclerView/Toolbar state for simpler saving/restoring its current state.
*/
public static final class State implements Parcelable {
public static Creator<State> CREATOR = new Creator<State>() {
public State createFromParcel(Parcel parcel) {
return new State(parcel);
}
public State[] newArray(int size) {
return new State[size];
}
};
// Keeps track of the overall vertical offset in the list
private int verticalOffset;
// Determines the scroll UP/DOWN offset
private int scrollingOffset;
// Toolbar values
private float translationY;
private float elevation;
State() {
}
State(Parcel parcel) {
this.verticalOffset = parcel.readInt();
this.scrollingOffset = parcel.readInt();
this.translationY = parcel.readFloat();
this.elevation = parcel.readFloat();
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel parcel, int flags) {
parcel.writeInt(verticalOffset);
parcel.writeInt(scrollingOffset);
parcel.writeFloat(translationY);
parcel.writeFloat(elevation);
}
}
}
private RecyclerViewUtils() {
}
}
And now because toolbar does not have fixed height first item on the list is not shown because toolbar is over it. How can I fix this? Has anyone had issues like this?
I've tried to set top margin on recyclerview to actionbarsize, and then it shows the first item, but when scrolled I see just a blank white space sitting on the top of the screen.
