According the docs,
Avoid performing expensive operations such as layout during animation as it can cause stuttering; try to perform expensive operations during the STATE_IDLE state.
Instead of using a Handler and hard-coding the time delay, you can override the onDrawerStateChanged method of ActionBarDrawerToggle (which implements DrawerLayout.DrawerListener), so that you can perform the expensive operations when the drawer is fully closed.
Inside MainActivity,
private class SmoothActionBarDrawerToggle extends ActionBarDrawerToggle {
private Runnable runnable;
public SmoothActionBarDrawerToggle(Activity activity, DrawerLayout drawerLayout, Toolbar toolbar, int openDrawerContentDescRes, int closeDrawerContentDescRes) {
super(activity, drawerLayout, toolbar, openDrawerContentDescRes, closeDrawerContentDescRes);
}
@Override
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
invalidateOptionsMenu();
}
@Override
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
invalidateOptionsMenu();
}
@Override
public void onDrawerStateChanged(int newState) {
super.onDrawerStateChanged(newState);
if (runnable != null && newState == DrawerLayout.STATE_IDLE) {
runnable.run();
runnable = null;
}
}
public void runWhenIdle(Runnable runnable) {
this.runnable = runnable;
}
}
Set the DrawerListener in onCreate:
mDrawerToggle = new SmoothActionBarDrawerToggle(this, mDrawerLayout, mToolbar, R.string.open, R.string.close);
mDrawerLayout.setDrawerListener(mDrawerToggle);
Finally,
private void selectItem(int position) {
switch (position) {
case DRAWER_ITEM_SETTINGS: {
mDrawerToggle.runWhenIdle(new Runnable() {
@Override
public void run() {
Intent intent = new Intent(MainActivity.this, SettingsActivity.class);
startActivity(intent);
}
});
mDrawerLayout.closeDrawers();
break;
}
case DRAWER_ITEM_HELP: {
mDrawerToggle.runWhenIdle(new Runnable() {
@Override
public void run() {
Intent intent = new Intent(MainActivity.this, HelpActivity.class);
startActivity(intent);
}
});
mDrawerLayout.closeDrawers();
break;
}
}
}