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Flexible Space with Image pattern UI setup and menu scroll listener
public class AnimateToolbar extends AppCompatActivity {
private CollapsingToolbarLayout collapsingToolbar;
private AppBarLayout appBarLayout;
private RecyclerView recyclerView;
private DessertAdapter dessertAdapter;
private Menu collapsedMenu;
private boolean appBarExpanded = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_animate_toolbar);
final Toolbar toolbar = (Toolbar) findViewById(R.id.anim_toolbar);
setSupportActionBar(toolbar);
if (getSupportActionBar() != null)
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
appBarLayout = (AppBarLayout) findViewById(R.id.appbar);
collapsingToolbar = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
collapsingToolbar.setTitle(getString(R.string.android_desserts));
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.header);
Palette.from(bitmap).generate(new Palette.PaletteAsyncListener() {
@SuppressWarnings("ResourceType")
@Override
public void onGenerated(Palette palette) {
int vibrantColor = palette.getVibrantColor(R.color.primary_500);
collapsingToolbar.setContentScrimColor(vibrantColor);
collapsingToolbar.setStatusBarScrimColor(R.color.black_trans80);
}
});
recyclerView = (RecyclerView) findViewById(R.id.scrollableview);
// Use when your list size is constant for better performance
recyclerView.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(linearLayoutManager);
dessertAdapter = new DessertAdapter(this);
recyclerView.setAdapter(dessertAdapter);
appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
@Override
public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
Log.d(AnimateToolbar.class.getSimpleName(), "onOffsetChanged: verticalOffset: " + verticalOffset);
// Vertical offset == 0 indicates appBar is fully expanded.
if (Math.abs(verticalOffset) > 200) {
appBarExpanded = false;
invalidateOptionsMenu();
} else {
appBarExpanded = true;
invalidateOptionsMenu();
}
}
});
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
if (collapsedMenu != null
&& (!appBarExpanded || collapsedMenu.size() != 1)) {
//collapsed
collapsedMenu.add("Add")
.setIcon(R.drawable.ic_action_add)
.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
} else {
//expanded
}
return super.onPrepareOptionsMenu(collapsedMenu);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
collapsedMenu = menu;
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
return true;
case R.id.action_settings:
return true;
}
if (item.getTitle() == "Add") {
Toast.makeText(this, "clicked add", Toast.LENGTH_SHORT).show();
}
return super.onOptionsItemSelected(item);
}
}
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