I'm using the default Swipe Tab Fragment code that Android starts with when you start a new Android application. I've figured out how to modify my data and use the tabs, but I haven't figured out how to add a simple fragment to what's already there. I wanted to add a infobar on the top of the tabs or right below them. I'm sure it's simple, I just can't figure out how lol. I learn by examples.
I've tried adding a view to viewpager, but my app is crashing, and I believe I'm totally doing it wrong.
In my MainActivity: ...
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Set up the action bar.
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
SubBarFragment infobar = new SubBarFragment();
mViewPager.addView(infobar.getView());
.....[extra code for menus and things]
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
....[code to show specific tabs and return the tab's fragment]
infobarfragment.java
public class InfobarFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.infobar, container, false);
return view;
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" />
infobar.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_wifi" />
<TextView
android:id="@+id/statusText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Wifi Status Information" />
</LinearLayout>
ViewPager save Fragment in FragmentManager with particular tags, So We can get ViewPager's fragment by FragmentManager class by providing tag. And ViewPager provide tag to each fragment by following syntax : Fragment page = getSupportFragmentManager(). findFragmentByTag("android:switcher:" + R.
You can't use ViewPager to swipe between Activities . You need to convert each of you five Activities into Fragments , then combine everything in one FragmentActivity with the Adapter you use with ViewPager .
You'll just need to cast it to the real fragment class if you want to call a specific method. int pos = viewpager. getCurrentItem(); Fragment activeFragment = adapter. getItem(pos); if(pos == 0) ((NPListFragment)activeFragment).
You can create swipe views using AndroidX's ViewPager widget. To use ViewPager and tabs, you need to add a dependency on ViewPager and on Material Components to your project. To insert child views that represent each page, you need to hook this layout to a PagerAdapter .
Steps for implementing viewpager: Adding the ViewPager widget to the XML layout (usually the main_layout). Creating an Adapter by extending the FragmentPagerAdapter or FragmentStatePagerAdapter class. An adapter populates the pages inside the Viewpager.
A FragmentManager manages Fragments in Android, specifically, it handles transactions between fragments. A transaction is a way to add, replace, or remove fragments. getPageTitle (int pos): (optional) Similar to getItem () this methods returns the title of the page at index pos.
//remove the pages. basically call to method removeAllViews from `ViewPager` pagerAdapter.removePages (); pagerAdapter.addPage (pass your fragment); After the advice of Peri Hartman, it started to work after I set null do ViewPager adapter and put the adapter again after the views removed. Before this the page 0 doesnt showed its list contents.
Update ViewPager dynamically? Although we see it often, using POSITION_NONE does not seem to be the way to go as it is very inefficient memory-wise. Here in this question, we should consider using Alvaro's approach:
you can follow this approach:
just Use fragments for each view in a pager.
write the below code in onCreate()
method of the FragmentActivity
.
List<Fragment> fragments = new Vector<Fragment>();
//for each fragment you want to add to the pager
Bundle page = new Bundle();
page.putString("url", url);
fragments.add(Fragment.instantiate(this,MyFragment.class.getName(),page));
//after adding all the fragments write the below lines
this.mPagerAdapter = new PagerAdapter(super.getSupportFragmentManager(), fragments);
mPager.setAdapter(this.mPagerAdapter);
A sample fragment definition:
public class MyFragment extends Fragment {
public static MyFragment newInstance(String imageUrl) {
final MyFragment mf = new MyFragment ();
final Bundle args = new Bundle();
args.putString("somedata", "somedata");
mf.setArguments(args);
return mf;
}
public MyFragment() {}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String data = getArguments().getString("somedata");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate and locate the main ImageView
final View v = inflater.inflate(R.layout.my_fragment_view, container, false);
//...
return v;
}
FragmentPagerAdapter
public class MyFragmentAdapter extends FragmentPagerAdapter {
public static int pos = 0;
private List<Fragment> myFragments;
public MyFragmentAdapter(FragmentManager fm, List<Fragment> myFrags) {
super(fm);
myFragments = myFrags;
}
@Override
public Fragment getItem(int position) {
return myFragments.get(position);
}
@Override
public int getCount() {
return myFragments.size();
}
@Override
public CharSequence getPageTitle(int position) {
setPos(position);
String PageTitle = "";
switch(pos)
{
case 0:
PageTitle = "page 1";
break;
case 1:
PageTitle = "page 2";
break;
case 2:
PageTitle = "page 3";
break;
case 3:
PageTitle = "page 4";
break;
case 4:
PageTitle = "page 5";
break;
case 5:
PageTitle = "page 6";
break;
case 6:
PageTitle = "page 7";
break;
}
return PageTitle;
}
public static int getPos() {
return pos;
}
public static void setPos(int pos) {
MyFragmentAdapter.pos = pos;
}
}
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