pass data to another fragment by swipe view with tab android studio,not button

Question

Is it possible to pass a data from fragment to fragment by swipe?

There are many articles teaching us how to pass the data from fragment to fragment, but most of t

Answer 1

If I understand your problem correctly, you are essentially implementing something a little bit like a "Wizard" where each step passes information to the next step as you swipe between the tabs or select them.

So in reality your problem is how to get the information out of a fragment when it is deselected and into a fragment when selected.

At the simplest level I would suggest your activity holds the "master" copy of all of the information and passes it into/takes it from each fragment in your tab pager adapter.

You would need some kind of "Domain" object to hold all the information you need to collect. Each tab would only update the bits of information it cares about..

public class WorkData {
 string information;
 string subCon;
... etc..
}

You add an instance of this to hold the master copy to your "tab" activity:

public class Tab extends ActionBarActivity implements ActionBar.TabListener {
...
 WorkData workData = new WorkData();
...

I would then suggest a simple interface that each of your "tab" fragments implement; something like:

public interface DataUpdate {
 void setData(WorkData data);
 WorkData getData();
}

Each of your tab fragments would implement this interface, updating the WorkData as required..

public class WorkForce extends Fragment implements DataUpdate {
...
  private WorkData workData; // this fragment's "copy" of the data
...
@Override
public WorkData getData() {
  this.workData.subCon = this.subCon; // Assuming subcon has been updated.. else use txt1.getText();
  return this.workData;
}

@Override
public void setData(WorkData workData) {
 this.workData = workData;
 // Update this page's views with the workData...
 // This assumes the fragment has already been created and txt1 is set to a view
 txt1.setText(workData.subCon);
 this.subCon = workData.subCon; // Actually could just use subCon in workData, but be aware that workData actually points to the Activity's copy (kinda makes getdata redundant.. but I like symmetry and couldn't be bothered making lots of copies of the object).
}

Then you just need to add the code to pass the data backwards and forwards.. in your "Tab" activity which looks like...

@Override
public void onTabSelected(ActionBar.Tab tab, android.support.v4.app.FragmentTransaction ft) {
 int position = tab.getPosition();
 DataUpdate dataUpdate = (DataUpdate) TabAdapter.getItem(position);
 // Pass the master workdata to the selected fragment
 dataUpdate.setData(this.workData);
}

@Override
public void onTabUnselected(ActionBar.Tab tab, android.support.v4.app.FragmentTransaction ft) {
 int position = tab.getPosition();
 DataUpdate dataUpdate = (DataUpdate) TabAdapter.getItem(position);
 // Update the master workdata from the unselected fragment
 this.workData = dataUpdate.getData();
}

@Override
public void onTabReselected(ActionBar.Tab tab, android.support.v4.app.FragmentTransaction ft) {
 // This might be pointless, but we'll do it anyway..
 int position = tab.getPosition();
 DataUpdate dataUpdate = (DataUpdate) TabAdapter.getItem(position);
 // Pass the master workdata to the selected fragment
 dataUpdate.setData(this.workData);
}

An important thing to notice here is that your TabPagerAdapter will create a new fragment every time you call getItem().. that will mean that we will never get any updates because each time we try to get the fragment it returns a new, empty fragment. We need to change this so that the fragments are still created when first asked for, but only created once so that we don't keep throwing away our work.

public class TabPagerAdapter extends FragmentStatePagerAdapter {
 private static final int NUMBER_OF_TABS = 3;
 private Fragment[] tabList = new Fragment[NUMBER_OF_TABS];

        public TabPagerAdapter(FragmentManager fm) {
            super(fm);
        }
       @Override
        public Fragment getItem(int i) {
            if (tabList[i] != null) {
              // Return a tab we created earlier..
              return tabList[i];
            } else {
              switch (i) {
                  case 0:
                      tabList[0] = Information.newInstance("name");
                      return  tabList[0];
                  case 1:
                      tabList[1] = WorkForce.newInstance("SubCon");
                      return tabList[1];
                  case 2:
                      tabList[2] = WorkDetailsTable.newInstance();
                      return tabList[2];
              }
            }
            return null ;
        }
        @Override
        public int getCount() {
            return NUMBER_OF_TABS;
        }

Hope this helps. Good luck :-)