I'm crating a tabHost to contain all the content of my Android application in 3 tabs, should i create the content of the tab inside its linear layout or create the tab content in a separate fragment and include it in the tab layout?
And how to include the fragment inside a layout also?
Excuse me i'm a bit beginner to this.
you just add viewpagger for calling fragment
public class MyPagerAdapter extends FragmentPagerAdapter {
private final String[] TITLES = { "Fragment1", "Fragment2", "Fragment2" };
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public CharSequence getPageTitle(int position) {
return TITLES[position];
}
#Override
public int getCount() {
return TITLES.length;
}
#Override
public Fragment getItem(int position) {
//return SuperAwesomeCardFragment.newInstance(position);
switch (position) {
case 0:
return new JavaFragment1(); //this call you fragment1
case 1:
return new JavaFragment2(); //this call you fragment2
case 2:
return new JavaFragment3(); //this call you fragment3
}
return null;
}
}
Related
i try to add a new fragment to my Tabbed Bar and did the following like i did for the Fragments before:
1. I created a Fragment and the layout for that
2. I added the Fragment name in my MainActivity:
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a PlaceholderFragment (defined as a static inner class below).
switch (position) {
case 0:
locations_fragment loc = new locations_fragment();
return loc;
case 1:
qr_code qra = new qr_code();
return qra;
case 2:
HTW_Fragment htw = new HTW_Fragment();
return htw;
case 3:
Events_Fragment pre = new Events_Fragment();
return pre;
default:
return null;
}
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Locations";
case 1:
return "QR Code Scanner";
case 2:
return "HTW";
case 3:
return "Events";
}
return null;
}
}
if i try to start my App it shows only the first three Fragment in my Tab Bar.
The reason is actually simple. You said to adapter there is only 3 pages.
:)
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
Replace it with return 4; and enjoy your 4-th page displayed.
I have a basic PagerAdapter:
public class PagerAdapter extends FragmentStatePagerAdapter {
int mNumOfTabs;
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public PagerAdapter(FragmentManager fm, int NumOfTabs) {
super(fm);
this.mNumOfTabs = NumOfTabs;
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
public PagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
Main tab1 = new Main();
return tab1;
case 1:
Secondary tab2 = new Secondary();
return tab2;
case 2:
Third tab3 = new Third();
return tab3;
default:
return null;
}
}
#Override
public int getCount() {
return 3;
}
}
It works perfectly for one tablayout and 3 fragments which are displayed in the viewpager. I have multiple of the same fragment design (same tabs) across a few fragments. Is it possible to use this one PagerAdapter with multiple options (fragments), so all it has to change is the classes that are instantiated.
Main tab1 = new Main(); to SomeOtherClass tab1 = new SomeOtherClass();. I tried doing this with parameters and variables but no success.
In the public Fragment getItem(int position); method, you should return the fragment in the mFragmentListfor the given position. Something like this:
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
By this way you can use this adapter for any Fragment.
Also, the method getCount() should be as follow:
#Override
public int getCount() {
return mFragmentList!=null ? mFragmentList.size() : 0;
}
In order to avoid hardcoded values.
Like in the image below, I have an Activity with a ViewPager (with TabLayout) inside.
Now I want to refresh for example the text of an TextView in a ViewPager Fragment. How can I do this?
http://imgur.com/0kWQCfx
[Sorry for the image link, but I don't have enough reputations yet.]
I already tried something like this:
//In Activity
View root = getLayoutInflater().inflate(R.layout.fragment_home, null);
TextView textView = (TextView) root.findViewById(R.id.text_view);
textView.setText("test");
But I get a NullPointerException for the textView.
Edit 1:
I only need to access the components inside one Fragment, so I am not using an array inside the Adapter.
I changed my ViewPagerAdapter to this:
public class ViewPagerAdapter extends FragmentPagerAdapter {
public HomeFragment fragment;
...
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return fragment = new HomeFragment();
case 1:
...
default:
return null;
}
}
But I still get a NullPointerException here:
final Fragment root = viewPagerAdapter.fragment;
Log.d("testtest", String.valueOf(root == null));
Write this code in your activity where you want to change fragment value. Your fragment id is e.g. my_fragment
Fragment frag = getFragmentManager().findFragmentById(R.id.my_fragment)
((TextView) frag.getView().findViewById(R.id.text_view)).setText(s);
You can create your own Adapter:
private class YourAdapter extends FragmentPagerAdapter implements ViewPager.OnPageChangeListener
{
Fragment screens[];
public CheckinHistoryAdapter(FragmentManager fm) {
super(fm);
screens = new Fragment[3];
screens[0] = new CoachFragment();
screens[1] = new LogingFragment();
screens[2] = new HistoryFragment();
}
#Override
public Fragment getItem(int index) {
if(index <= screens.length)
{
return screens[index];
}
return null;
}
#Override
public int getCount() {
return screens.length;
}
}
Use it like this
mViewPager.setAdapter(this.mPagerAdapter);
You can access fragment object with getItem method.
If you only need a reference to one Fragment, then just use the position parameter passed into instantiateItem(), and only assign your Fragment reference for the desired position:
public class ViewPagerAdapter extends FragmentPagerAdapter {
public HomeFragment fragment;
//...
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new HomeFragment(); //modified
case 1:
...
default:
return null;
}
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
Fragment createdFragment = (Fragment) super.instantiateItem(container, position);
if (position == 0) {
fragment = (HomeFragment) createdFragment;
}
return createdFragment;
}
}
I have implemented the first row of tab.
Inside that tab i have another set of Tabs.
Specifically two more tabs.
Please refer to these images.
The Picture above is the dog tab is selected.
The picture above is I want to select the Cat tab.
But unfortunately, the tab is not sliding properly.
its like its just a slowly scrolling.
but it should be on just one slide it should be on the cat tab.
My First layer of tab is inside Fragment.
The second row of tab is also in Fragment.
public class AdapterFragmentPagerItem extends FragmentStatePagerAdapter {
String[] pageTitle={"Do's","Dont's","First Aid"};
public AdapterFragmentPagerItem(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch(position){
case 0:
return new FragmentDo();
case 1:
return new FragmentDonts();
case 2:
return new FragmentFirstAid();
}
return null;
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
return pageTitle[position];
}
}
The above code is for the first image.
public class AdapterFragmentDos extends FragmentStatePagerAdapter {
String[] pageTitle = {"Dog", "Cat"};
public AdapterFragmentDos(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
if(position==0){
return new FragmentDonts();
}else{
return new FragmentFirstAid();
}
}
#Override
public int getCount() {
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
return pageTitle[position];
}
}
And this is for the second image.
I am unable to create dynamic layout for each tabs, i am able to create tabs dynamically by this constructor(public MyPagerAdapter(FragmentManager fm , int noOfTabs)), but coudn't inflate the view for each tabs creating for each fragment which should be dyanmic.
public class MyPagerAdapter extends FragmentPagerAdapter
{
private final String[] TITLES = { "Categories", "Home", "Top Paid", "Top Free", "Top Grossing", "Top New Paid",
"Top New Free", "Trending" };
int noOfTabs;
**public MyPagerAdapter(FragmentManager fm , int noOfTabs)
{
super(fm);
this.noOfTabs = noOfTabs;
}**
/*public MyPagerAdapter(FragmentManager fm)
{
super(fm);
}*/
#Override
public CharSequence getPageTitle(int position) {
return TITLES[position];
}
#Override
public int getCount() {
return noOfTabs; //TITLES.length;
}
#Override
public Fragment getItem(int position) {
return SuperAwesomeCardFragment.newInstance(position);
}
}
I am facing problem here which should be dynamic and not static as three fragments(FragmentA, FragmentB , FragmentC), it can be any number of fragments depending on the int noOfTabs:
#Override
public Fragment getItem(int position) {
Fragment fragment =null;
switch (position) {
case 0:
fragment = new FragmentA();
break;
case 1:
fragment = new FragmentB();
break;
case 2:
fragment = new FragmentC();
break; }
return fragment;
}
Thanks in advance if any one could help me in this, as i am using this with help of library PagerSlidingTabStrip.
#nbokmans solution may be okay but i've used a container to accomplish that.
Creating a simple host fragment with FrameLayout inside and by replacing fragment was a good dynamic solution for me.
Using Otto EventBus just made it awesome because it can be changed from everywhere with just simple post
#Subscribe
fun changeFragment(type: FragmentTypeEvent){
val ft = activity.supportFragmentManager.beginTransaction()
val frag = getFragment(type)
ft.replace(R.id.container_frame,frag)
ft.commit()
}