mzgreen’s gists

mzgreen / PartTwoActivity.java

Created February 28, 2015 08:26

PartTwoActivity class onShow and onHide implementation

	private void initRecyclerView() {
	final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
	recyclerView.setLayoutManager(new LinearLayoutManager(this));
	RecyclerAdapter recyclerAdapter = new RecyclerAdapter(createItemList());
	recyclerView.setAdapter(recyclerAdapter);

	recyclerView.setOnScrollListener(new HidingScrollListener(this) {

	@Override
	public void onMoved(int distance) {

mzgreen / HidingScrollListener.java

Created February 28, 2015 08:23

HidingScrollListener condition snapping

	else { // it's not visible
	if ((mToolbarHeight - mToolbarOffset) > SHOW_THRESHOLD) {
	setVisible();
	} else {
	setInvisible();
	}
	}

mzgreen / HidingScrollListener.java

Created February 28, 2015 08:22

HidingScrollListener condition snapping

	if (mControlsVisible) {
	if (mToolbarOffset > HIDE_THRESHOLD) {
	setInvisible();
	} else {
	setVisible();
	}
	}

mzgreen / HidingScrollListener.java

Created February 28, 2015 08:18

HidingScrollListener class with snapping

	public abstract class HidingScrollListener extends RecyclerView.OnScrollListener {

	private static final float HIDE_THRESHOLD = 10;
	private static final float SHOW_THRESHOLD = 70;

	private int mToolbarOffset = 0;
	private boolean mControlsVisible = true;
	private int mToolbarHeight;

	public HidingScrollListener(Context context) {

mzgreen / PartTwoActivity.java

Created February 28, 2015 08:16

Implementation of onMove method in PartTwoActivity class

	private void initRecyclerView() {
	final RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
	recyclerView.setLayoutManager(new LinearLayoutManager(this));
	RecyclerAdapter recyclerAdapter = new RecyclerAdapter(createItemList());
	recyclerView.setAdapter(recyclerAdapter);

	recyclerView.setOnScrollListener(new HidingScrollListener(this) {
	@Override
	public void onMoved(int distance) {
	mToolbarContainer.setTranslationY(-distance);

mzgreen / HidingScrollListener.java

Created February 28, 2015 08:12

Assuring that mToolbarOffset will get only values from 0 to mToolbarHeight

	if((mToolbarOffset <mToolbarHeight && dy>0) \|\| (mToolbarOffset >0 && dy<0)) {
	mToolbarOffset += dy;
	}

mzgreen / HidingScrollListener.java

Created February 28, 2015 08:10

HidingScrollListener class without snapping

	public abstract class HidingScrollListener extends RecyclerView.OnScrollListener {

	private int mToolbarOffset = 0;
	private int mToolbarHeight;

	public HidingScrollListener(Context context) {
	mToolbarHeight = Utils.getToolbarHeight(context);
	}

	@Override

mzgreen / ActivityPartTwo.java

Created February 28, 2015 08:07

ActivityPartTwo class

	public class PartTwoActivity extends ActionBarActivity {

	private Toolbar mToolbar;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
	setTheme(R.style.AppThemeGreen);
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_part_two);

mzgreen / activity_part_two.xml

Created February 28, 2015 08:04

ActivityPartTwo layout file

	<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent">

	<android.support.v7.widget.RecyclerView
	android:id="@+id/recyclerView"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:paddingTop="?attr/actionBarSize"
	android:clipToPadding="false"/>

mzgreen / HidingScrollListener.java

Last active August 29, 2015 14:15

HideOnScrollExample - HidingScrollListener fixed onScroll

	@Override
	public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
	super.onScrolled(recyclerView, dx, dy);

	int firstVisibleItem = ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstVisibleItemPosition();
	//show views if first item is first visible position and views are hidden
	if (firstVisibleItem == 0) {
	if(!controlsVisible) {
	onShow();
	controlsVisible = true;

Michał Z. mzgreen