Resize a VirtualBox VDI Disk
VBoxManage modifyhd MyLinux.vdi --resize 100000
Hide FloatingActionButton on Scroll of RecyclerView
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener()
{
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy)
{
if (dy > 0 ||dy<0 && fab.isShown())
{
fab.hide();
}
}
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState)
{
if (newState == RecyclerView.SCROLL_STATE_IDLE)
{
fab.show();
}
super.onScrollStateChanged(recyclerView, newState);
}
});
References
https://github.com/mhdr/AndroidSamples/tree/master/095
https://stackoverflow.com/questions/33208613/hide-floatingactionbutton-on-scroll-of-recyclerview
No EntityManager with actual transaction available for current thread Exception on Spring
@Transactional(readOnly = false)
public interface FormRowRepository extends JpaRepository<FormRow, Long> {
List<FormRow> findByForm(Form form);
void deleteById(Long id);
void deleteById(List<Long> ids);
}
References
https://stackoverflow.com/questions/10394857/how-to-use-transactional-with-spring-data
Set Selected Item of Spinner programmatically on Android
spinnerObject.setSelection(position);
References
https://stackoverflow.com/questions/11072576/set-selected-item-of-spinner-programmatically
Get current fragment displayed in ViewPager on Android
First define a SparseArray in your ViewPagers’ adapters like below. In this array we’ll hold the instance of fragments.
SparseArray<Fragment> registeredFragments = new SparseArray<>();
And Override your Adapters’ instantiateItem method.
@Override
public Object instantiateItem(ViewGroup container, int position) {
Fragment fragment = (Fragment) super.instantiateItem(container, position);
registeredFragments.put(position, fragment);
return fragment;
}
Also Override destroyItem method of your ViewPagers
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
registeredFragments.remove(position);
super.destroyItem(container, position, object);
}
And define a new method to get your ViewPager Fragments instance.
public Fragment getRegisteredFragment(int position) {
return registeredFragments.get(position);
}
And finally set add a PageChangeListener to your ViewPagers:
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
// Here's your instance
YourFragment fragment =(YourFragment)yourPagerAdapter.getRegisteredFragment(position);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
Or
int position = viewPager.getCurrentItem(); YourFragment fragment =(YourFragment)yourPagerAdapter.getRegisteredFragment(position);
References
https://stackoverflow.com/questions/39143087/how-to-get-the-current-fragment-displayed-in-a-specific-tab-of-a-viewpager
https://stackoverflow.com/questions/8258759/getting-the-current-position-of-a-viewpager
Get the current position of a ViewPager on Android
mViewPager.getCurrentItem()
or you can use event for this:
ViewPager.setOnPageChangeListener(OnPageChangeListener listener)
References
https://stackoverflow.com/questions/8258759/getting-the-current-position-of-a-viewpager
https://stackoverflow.com/questions/8117523/how-do-you-get-the-current-page-number-of-a-viewpager-for-android
Install phpMyAdmin on Ubuntu 16.04
sudo apt-get update sudo apt-get install phpmyadmin php-mbstring php-gettext
sudo phpenmod mcrypt sudo phpenmod mbstring
sudo systemctl restart apache2
https://domain_name_or_IP/phpmyadmin
JoinColumn vs mappedBy in JPA
@Entity
public class Troop {
@OneToMany(mappedBy="troop")
public Set<Soldier> getSoldiers() {
...
}
@Entity
public class Soldier {
@ManyToOne()
@JoinColumn(name="troop_fk")
public Troop getTroop() {
...
}
References
https://stackoverflow.com/questions/11938253/jpa-joincolumn-vs-mappedby
https://stackoverflow.com/questions/37047938/jpa-hibernate-onetoone-joincolumn-referencedcolumnname-ignored
Back Navigation for ActionBar on Android
AndroidManifest.xml
<activity android:name=".ProfileActivity">
<meta-data android:name="android.support.PARENT_ACTIVITY" android:value=".MainActivity"/>
</activity>
ProfileActivity.java
public class ProfileActivity extends AppCompatActivity {
Toolbar toolbarProfile;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
toolbarProfile = (Toolbar) findViewById(R.id.toolbarProfile);
setSupportActionBar(toolbarProfile);
ViewCompat.setLayoutDirection(toolbarProfile, ViewCompat.LAYOUT_DIRECTION_RTL);
getSupportActionBar().setTitle(R.string.profile_management);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_back); // for custom indicator
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
// Respond to the action bar's Up/Home button
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
//Intent intent=new Intent(ProfileActivity.this,MainActivity.class);
//NavUtils.navigateUpTo(ProfileActivity.this,intent);
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onBackPressed() {
NavUtils.navigateUpFromSameTask(this);
super.onBackPressed();
}
}
References
https://developer.android.com/training/implementing-navigation/ancestral.html
https://developer.android.com/training/implementing-navigation/temporal.html
https://stackoverflow.com/questions/28740610/how-do-i-show-back-button-in-activity
https://stackoverflow.com/questions/5312334/how-to-handle-back-button-in-activity