Android 从其父活动刷新片段列表 [英] Android refresh a fragment list from its parent activity

问题描述

我有一个主要活动，其中包含带有 3 个菜单按钮的操作栏.

I have a main activity which contains the action bar with 3 menu buttons in it.

然后我在这个主要活动中有一个片段，它有一个列表.

I then have a fragment within this main activity which has a list.

我希望能够在单击菜单按钮之一时从主活动刷新片段中的列表，或者最好只是从列表中删除所有行.

I would like to be able to refresh the list in the fragment from the main activity, when one of the menu buttons is clicked, or preferably just removed all the rows from the list.

感谢任何帮助.

谢谢.

public class Favourite extends SherlockFragmentActivity {

    ActionBar actionBar;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.favourite);

        actionBar = getSupportActionBar();

        actionBar.setDisplayShowTitleEnabled(false);

        BitmapDrawable bg = (BitmapDrawable)getResources().getDrawable(R.drawable.actionbar_bg);
        bg.setTileModeX(TileMode.REPEAT); 
        getSupportActionBar().setBackgroundDrawable(bg);

        getSupportActionBar().setIcon(R.drawable.favourite_title);

        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
        ActionBar.Tab tabAll = actionBar.newTab();
        ActionBar.Tab tabfavs = actionBar.newTab();
        ActionBar.Tab tabhist = actionBar.newTab();
        tabAll.setText("all");
        tabfavs.setText("favs");
        tabhist.setText("hist");
        tabAll.setTabListener(new MyTabListener());
        tabfavs.setTabListener(new MyTabListener());
        tabhist.setTabListener(new MyTabListener());
        actionBar.addTab(tabAll);
        actionBar.addTab(tabfavs);
        actionBar.addTab(tabhist);


        try{

        }
        catch(Exception e)
        {
        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        MenuInflater inflater = getSupportMenuInflater();
        inflater.inflate(R.menu.actionbar_itemlist_favourite, menu);

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch(item.getItemId()) {
                case R.id.history:
                    break;
                case R.id.favourite:
                    Intent favAct = new Intent(this, Favourite.class);
                    startActivity(favAct);
                    break;
                case R.id.delete:
                    ///I WANT TO BE ABLE TO REFRESH FRAGMENTLIST FROM HERE
                }
                return true;
    }

  }

class MyTabListener implements ActionBar.TabListener {

    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        if(tab.getPosition()==0)
        {
            FavouriteAllWords frag = new FavouriteAllWords();
            ft.replace(android.R.id.content, frag);

        }
        else if(tab.getPosition()==1)
        {
            FavouriteFavWords frag = new FavouriteFavWords();
            ft.replace(android.R.id.content, frag);

        }
        else if(tab.getPosition()==2)
        {
            FavouriteHistWords frag = new FavouriteHistWords();
            ft.replace(android.R.id.content, frag);
        }
    }

    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }

    public void onTabReselected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }

}

//////////////////我的列表片段类

////////////////////MY LIST FRAGMENT CLASS

public class FavouriteAllWords extends ListFragment {

    ArrayAdapter<String> adapter;

    List<String> stringOfFavWords;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup group, Bundle saved)
    {   
        adapter = new ArrayAdapter<String>(  
                inflater.getContext(), R.layout.row, stringOfFavWords);  
                setListAdapter(adapter);  

        return super.onCreateView(inflater, group, saved);  
    }

    @Override
    public void onActivityCreated (Bundle savedInstanceState)
    {   
        super.onActivityCreated(savedInstanceState);
    }

}

推荐答案

您可以使用 INTERFACE 轻松实现这一点

You can easily achieve this using INTERFACE

MainActivity.java

public class MainActivity extends Activity {

    public FragmentRefreshListener getFragmentRefreshListener() {
        return fragmentRefreshListener;
    }

    public void setFragmentRefreshListener(FragmentRefreshListener fragmentRefreshListener) {
        this.fragmentRefreshListener = fragmentRefreshListener;
    }

    private FragmentRefreshListener fragmentRefreshListener;

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        Button b = (Button)findViewById(R.id.btnRefreshFragment);

        b.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(getFragmentRefreshListener()!=null){
                    getFragmentRefreshListener().onRefresh();
                }
            }
        });


    }


    public interface FragmentRefreshListener{
        void onRefresh();
    }

}

MyFragment.java

public class MyFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = null; // some view

        /// Your Code


        ((MainActivity)getActivity()).setFragmentRefreshListener(new MainActivity.FragmentRefreshListener() {
            @Override
            public void onRefresh() {

                // Refresh Your Fragment
            }
        });


        return v;
    }
}

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