Question

我已经尝试了一段时间（同时在这里搜索），当我在其他片段中按下按钮时，我可以帮助我在MainFragment中刷新listView。 sommeone可以解释我如何使它工作？

这里有MainFragment功能（我排除了其他功能，因为我不知道他们是如何贡献的）：

public class MainFragment extends Fragment {
public void otherList() {
    SQLite db = new SQLite(getActivity());
    db.open();
    Calendar sCalendar = Calendar.getInstance();
    String day = sCalendar.getDisplayName(Calendar.DAY_OF_WEEK,
            Calendar.LONG, Locale.ENGLISH);
    Cursor c = db.getAllRecords(day);
    Calendar cal = Calendar.getInstance();
    int hour = cal.get(Calendar.HOUR_OF_DAY);
    arrayOfBars.clear();
    if (c.moveToFirst()) {
        do {
            String country = c.getString(0);
            String city = c.getString(1);
            String bar = c.getString(2);
            String timeStart = c.getString(3);

            String[] h = timeStart.split(":");
            int times = Integer.parseInt(h[0]);

            String timeEnd = c.getString(4);
            String[] h2 = timeEnd.split(":");
            int timee = Integer.parseInt(h2[0]);

            String placeLaLo = c.getString(5);
            String description = c.getString(6);
            String likes = c.getString(7);
            String offer = c.getString(8);

            if (hour < (times + 1) || hour < (timee)) {
                getPrefs = PreferenceManager
                        .getDefaultSharedPreferences(MainFragment.this
                                .getActivity());
                boolean lay = getPrefs.getBoolean("boolean", false);
                if (lay == true) {
                    while (times < timee) {
                        timeStart = times + ":" + h[1];
                        times++;
                        timeEnd = times + ":" + h2[1];
                        arrayOfBars.add(new BarObject(country, city, bar,
                                timeStart, timeEnd, placeLaLo, description,
                                likes, offer, bar));
                    }
                } else {
                    arrayOfBars.add(new BarObject(country, city, bar,
                            timeStart, timeEnd, placeLaLo, description,
                            likes, offer, bar));
                }
            }

        } while (c.moveToNext());

        Collections.sort(arrayOfBars, new BarObject.CompST());

        lv2.setAdapter(null);
        adapter = new BarAdapter(getActivity(), arrayOfBars);
        lv2.setAdapter(adapter);
    } else {
        Toast.makeText(getActivity(), "No database found",
                Toast.LENGTH_LONG).show();
    }
    db.close();
}

}

这是另一个片段：

public class SocialMedia extends Fragment {
ImageButton facebook, twitter, layoutS;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.social_media, container, false);
    layoutS = (ImageButton) view.findViewById(R.id.ibLayout);

    layoutS.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            SharedPreferences getPrefs = PreferenceManager
                    .getDefaultSharedPreferences(SocialMedia.this
                            .getActivity());
            boolean lay = getPrefs.getBoolean("boolean", false);
            SharedPreferences.Editor e = getPrefs.edit();
            lay = !lay;
            e.putBoolean("boolean", lay);
            e.commit();
                            //Here I want to call otherList() from MainFragment
        }
    });
    return view;
}

}

Answer 1

FragmentManager fm = getFragmentManager(); 
MainFragment fragm = (MainFragment)fm.findFragmentById(R.id.main_fragment); 
fragm.otherList();

此代码最适合我。而且看起来很容易

Answer 2

在MainFragment类中，您可以执行以下代码：

private static MainFragment instance = null;

@Override  
public void onCreate(@Nullable Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
    instance = this;  
}

public static MainFragment getInstance() {  
    return instance;  
}

在SocialMedia类中，您可以按以下方式调用方法：

MainFragment.getInstance().otherList();

Answer 3

你应该使用interface。在interface课程中定义OtherFragment并在MainActivity中实施，并在public中定义MainFragment方法，以便刷新ListView并致电来自MainActivity的方法。这是一个例子：

public Class OtherFragment extends Fragment implements OnClickListener {

private Communicator communicator;

   ...

public void setCommunicator(Communicator communicator) {
    this.communicator = communicator;
}

@Override
public void onClick(View v) {
   communicator.clicked();
}

   public interface Communicator {
      public void clicked();
   }
}

和您的MainActivity：

public class MainActivity extends Activity implements OtherFragment.Communicator {

   MainFragment mainFragment;

   @Override
   protected void onCreate(Bundle b) {
      ...
      OtherFragment otherFragment = new OtherFragment();
      otherFragment.setCommunicator(this);
      ...
   }

   ...

   @Override 
   public void clicked() {
     mainFragment.updateList();
   }
}

和您的MainFragment：

public class MainFragment extends Fragment {

    ...

    public void updateList() {
        // update list
    }
}

Answer 4

要从另一个对象调用方法（Fragment是一个对象），您需要具有该对象的引用。因此，如果您想从MainFragment#otherList()个实例致电SocialMedia，SocialMedia需要引用MainFragment。

例如：

public class SocialMedia {

    private MainFragment mainFragment = null;

    public void setMainFragment(final MainFragment mainFragment) {
        this.mainFragment = mainFragment
    }
}

然后您可以使用this.mainFragment.otherList()。

Answer 5

sftpserver

从另一个片段中调用一个片段中的方法

5 个答案: