private void initViewPagerAndTabs() {
ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
PagerAdapter pagerAdapter = new PagerAdapter(getSupportFragmentManager());
pagerAdapter.addFragment(PartThreeFragment.createInstance(20), "One");
pagerAdapter.addFragment(PartThreeFragment.createInstance(4), "Two");
viewPager.setAdapter(pagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabLayout);
tabLayout.setupWithViewPager(viewPager);
}
void updateAdapter(PagerAdapter oldAdapter, PagerAdapter newAdapter) {
if (oldAdapter != null) {
oldAdapter.unregisterDataSetObserver(mPageListener);
}
if (newAdapter != null) {
newAdapter.registerDataSetObserver(mPageListener);
}
if (mPager != null) {
mLastKnownCurrentPage = -1;
mLastKnownPositionOffset = -1;
updateText(mPager.getCurrentItem(), newAdapter);
requestLayout();
}
}
/**
* Adds a new slide
*
* @param fragment Instance of Fragment which should be added as slide
*/
public void addSlide(@NonNull Fragment fragment) {
fragments.add(fragment);
if (isWizardMode) {
setOffScreenPageLimit(fragments.size());
}
mPagerAdapter.notifyDataSetChanged();
}
/**
* Called before a slide change happens. By returning false, one can disallow the slide change.
*
* @return true, if the slide change should be allowed, else false
*/
private boolean handleBeforeSlideChanged() {
Fragment currentFragment = mPagerAdapter.getItem(pager.getCurrentItem());
LogHelper.d(
TAG,
String.format(
"User wants to move away from slide: %s. Checking if this should be allowed...",
currentFragment));
// Check if the current fragment implements ISlidePolicy, else a change is always allowed
if (currentFragment instanceof ISlidePolicy) {
ISlidePolicy slide = (ISlidePolicy) currentFragment;
LogHelper.d(TAG, "Current fragment implements ISlidePolicy.");
// Check if policy is fulfilled
if (!slide.isPolicyRespected()) {
LogHelper.d(TAG, "Slide policy not respected, denying change request.");
return false;
}
}
LogHelper.d(TAG, "Change request will be allowed.");
return true;
}
private void handleIllegalSlideChangeAttempt() {
Fragment currentFragment = mPagerAdapter.getItem(pager.getCurrentItem());
if (currentFragment != null && currentFragment instanceof ISlidePolicy) {
ISlidePolicy slide = (ISlidePolicy) currentFragment;
if (!slide.isPolicyRespected()) {
slide.onUserIllegallyRequestedNextPage();
}
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
viewPager = (ViewPager) findViewById(R.id.pager);
PagerAdapter adapter = new PagerAdapter(getSupportFragmentManager(), this);
viewPager.setAdapter(adapter);
viewPager.setOnPageChangeListener(
new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < adapter.getCount(); i++) {
actionBar.addTab(actionBar.newTab().setText(adapter.getPageTitle(i)).setTabListener(this));
}
}
void updateText(int currentItem, PagerAdapter adapter) {
final int itemCount = adapter != null ? adapter.getCount() : 0;
mUpdatingText = true;
CharSequence text = null;
if (currentItem >= 1 && adapter != null) {
text = adapter.getPageTitle(currentItem - 1);
}
mPrevText.setText(text);
mCurrText.setText(adapter != null ? adapter.getPageTitle(currentItem) : null);
text = null;
if (currentItem + 1 < itemCount && adapter != null) {
text = adapter.getPageTitle(currentItem + 1);
}
mNextText.setText(text);
// Measure everything
final int width = getWidth() - getPaddingLeft() - getPaddingRight();
final int childHeight = getHeight() - getPaddingTop() - getPaddingBottom();
final int childWidthSpec =
MeasureSpec.makeMeasureSpec((int) (width * 0.8f), MeasureSpec.AT_MOST);
final int childHeightSpec = MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.EXACTLY);
mPrevText.measure(childWidthSpec, childHeightSpec);
mCurrText.measure(childWidthSpec, childHeightSpec);
mNextText.measure(childWidthSpec, childHeightSpec);
mLastKnownCurrentPage = currentItem;
if (!mUpdatingPositions) {
updateTextPositions(currentItem, mLastKnownPositionOffset);
}
mUpdatingText = false;
}
@NonNull
public List<MyFragment> getSlides() {
return mPagerAdapter.getFragments();
}
public void addSlide(@NonNull MyFragment fragment) {
fragments.add(fragment);
mPagerAdapter.notifyDataSetChanged();
}
public void addSlide(@NonNull Fragment fragment, @NonNull Context context) {
fragments.add(Fragment.instantiate(context, fragment.getClass().getName()));
mPagerAdapter.notifyDataSetChanged();
}
private void initFragment() {
ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
PagerAdapter pagerAdapter = new PagerAdapter(getSupportFragmentManager());
pagerAdapter.addFragment(DetailsFragment.createInstance(_deposit.get_id()), "Details");
viewPager.setAdapter(pagerAdapter);
}