Question

请帮帮我。

我想知道在点击项目中的图像按钮后如何刷新listview。

这是我的按钮onclick内部适配器..

buttonHeart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                if (arg0 != null) {
                    FragmentOne_DbAdapter database=new FragmentOne_DbAdapter(context);
                    database.open();


                    if(favorite.matches("0")) {
                        database.updateItemFavorite(_id,"1");
                        buttonHeart.setImageResource(R.drawable.heartred);
                        //Toast.makeText(arg0.getContext(),favorite,Toast.LENGTH_LONG).show();
                    }else if(favorite.matches("1")){
                        database.updateItemFavorite(_id, "0");
                        buttonHeart.setImageResource(R.drawable.heart);
                        //Toast.makeText(arg0.getContext(),favorite,Toast.LENGTH_LONG).show();
                    }
                }
            }
        });

这是我的完整适配器..

package com.magicstarme.virtualsongbook;

import android.content.Context;
import android.database.Cursor;
import android.media.Image;
import android.support.v4.widget.CursorAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ToggleButton;

import java.util.ArrayList;

/**
 * Created by Joe on 6/29/2016.
 */
public class FragmentOne_Adapter extends CursorAdapter {

    public FragmentOne_Adapter(Context context, Cursor c, int flags) {
        super(context, c, flags);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void bindView(View view, final Context context, Cursor cursor) {
        // TODO Auto-generated method stub
        TextView txtTitle = (TextView) view.findViewById(R.id.title);
        TextView txtArtist = (TextView) view.findViewById(R.id.artist);
        TextView txtVolume = (TextView) view.findViewById(R.id.volume);
        TextView txtNumber = (TextView) view.findViewById(R.id.number);

        final ImageButton buttonHeart = (ImageButton) view.findViewById(R.id.heart);


        final int _id = cursor.getInt(cursor.getColumnIndexOrThrow("_id"));
        String title = cursor.getString(cursor.getColumnIndexOrThrow("title"));
        String artist = cursor.getString(cursor.getColumnIndexOrThrow("artist"));
        String volume = cursor.getString(cursor.getColumnIndexOrThrow("volume"));
        final String favorite = cursor.getString(cursor.getColumnIndexOrThrow("favorite"));
        String number = cursor.getString(cursor.getColumnIndexOrThrow("number"));

        // Populate fields with extracted properties
        txtTitle.setText(title);
        txtArtist.setText(artist);
        txtVolume.setText(volume);
        txtNumber.setText(number);

        if(favorite.matches("0")) {
            buttonHeart.setImageResource(R.drawable.heart);
        }else if(favorite.matches("1")){
            buttonHeart.setImageResource(R.drawable.heartred);
        }

        buttonHeart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View arg0) {
                if (arg0 != null) {
                    FragmentOne_DbAdapter database=new FragmentOne_DbAdapter(context);
                    database.open();


                    if(favorite.matches("0")) {
                        database.updateItemFavorite(_id,"1");
                        buttonHeart.setImageResource(R.drawable.heartred);
                        //Toast.makeText(arg0.getContext(),favorite,Toast.LENGTH_LONG).show();
                    }else if(favorite.matches("1")){
                        database.updateItemFavorite(_id, "0");
                        buttonHeart.setImageResource(R.drawable.heart);
                        //Toast.makeText(arg0.getContext(),favorite,Toast.LENGTH_LONG).show();
                    }
                }
            }
        });

    }

    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        // TODO Auto-generated method stub
        return LayoutInflater.from(context).inflate(R.layout.fragment_fragment_one_slview, parent, false);
    }

}

这是我的片段..

package com.magicstarme.virtualsongbook;

import android.content.Context;
import android.database.Cursor;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.FilterQueryProvider;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.SearchView;
import android.widget.SimpleCursorAdapter;
import android.widget.TabHost;
import android.widget.Toast;
import android.widget.ToggleButton;

import java.util.ArrayList;


/**
 * A simple {@link Fragment} subclass.
 * Activities that contain this fragment must implement the
 * {@link FragmentOne.OnFragmentInteractionListener} interface
 * to handle interaction events.
 * Use the {@link FragmentOne#newInstance} factory method to
 * create an instance of this fragment.
 */
public class FragmentOne extends Fragment {
    // TODO: Rename parameter arguments, choose names that match
    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
    private static final String ARG_PARAM1 = "param1";
    private static final String ARG_PARAM2 = "param2";

    // TODO: Rename and change types of parameters
    private String mParam1;
    private String mParam2;

    private OnFragmentInteractionListener mListener;

    public FragmentOne() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @param param1 Parameter 1.
     * @param param2 Parameter 2.
     * @return A new instance of fragment FragmentOne.
     */
    // TODO: Rename and change types and number of parameters
    public static FragmentOne newInstance(String param1, String param2) {
        FragmentOne fragment = new FragmentOne();
        Bundle args = new Bundle();
        args.putString(ARG_PARAM1, param1);
        args.putString(ARG_PARAM2, param2);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            mParam1 = getArguments().getString(ARG_PARAM1);
            mParam2 = getArguments().getString(ARG_PARAM2);
        }
    }

    private FragmentOne_DbAdapter dbHelper;
    private SimpleCursorAdapter dataAdapter;
    private FragmentOne_Adapter FragmentOneAdapter;
    ListView listView;
    EditText player1ESearch;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.fragment_fragment_one, container, false);

        TabHost host = (TabHost) rootView.findViewById(R.id.tabHost);
        host.setup();

        //Tab 1
        TabHost.TabSpec spec = host.newTabSpec("SONG LIST");
        spec.setContent(R.id.tab1);
        spec.setIndicator("SONG LIST");
        host.addTab(spec);


            player1ESearch = (EditText) rootView.findViewById(R.id.player1Search);
            listView = (ListView) rootView.findViewById(R.id.slPlayer1ListView);
            dbHelper = new FragmentOne_DbAdapter(getActivity());
            dbHelper.open();
            //Clean all data
            //dbHelper.deleteAllPlayer1();
            //Add some data
            dbHelper.insertPlayer1Songlist();
            //Generate ListView from SQLite Database
            displayPlayer1ListView();

            ImageButton dplayer1ESearch=(ImageButton) rootView.findViewById(R.id.delete);
            dplayer1ESearch.setOnClickListener(new View.OnClickListener() {
                    public void onClick(View v) {
                        player1ESearch.setText("");
                    }
            });


        //Tab 2
        spec = host.newTabSpec("NEW SONGS");
        spec.setContent(R.id.tab2);
        spec.setIndicator("NEW SONGS");
        host.addTab(spec);

        //Tab 3
        spec = host.newTabSpec("FAVORITES");
        spec.setContent(R.id.tab3);
        spec.setIndicator("FAVORITES");
        host.addTab(spec);

        return rootView;
    }

    private void displayPlayer1ListView() {
        Cursor cursor = dbHelper.fetchAllPlayer1();

        FragmentOneAdapter = new FragmentOne_Adapter(getActivity(), cursor, 0);
        listView.setAdapter(FragmentOneAdapter);

        player1ESearch.addTextChangedListener(new TextWatcher() {

            public void afterTextChanged(Editable s) {
            }

            public void beforeTextChanged(CharSequence s, int start,
                                          int count, int after) {
            }

            public void onTextChanged(CharSequence s, int start,
                                      int before, int count) {
                FragmentOneAdapter.getFilter().filter(s.toString());
            }
        });

        FragmentOneAdapter.setFilterQueryProvider(new FilterQueryProvider() {
            public Cursor runQuery(CharSequence constraint) {
                return dbHelper.fetchPlayer1ByTitle(constraint.toString());
            }
        });

    }

    // TODO: Rename method, update argument and hook method into UI event
    public void onButtonPressed(Uri uri) {
        if (mListener != null) {
            mListener.onFragmentInteraction(uri);
        }
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            throw new RuntimeException(context.toString()
                    + " must implement OnFragmentInteractionListener");
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    /**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p/>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        void onFragmentInteraction(Uri uri);
    }
}

Answer 1

点击按钮刷新notifyDataSetChanged();

后，点击简单ListView即可

buttonHeart.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View arg0) {
         ...
         notifyDataSetChanged();
    }
});

Answer 2

基本上您的列表视图与适配器连接。您需要通知此适配器重绘列表视图。您能否准确地提供有关按钮单击侦听器代码的详细信息（在哪个类中）。如果它在你的适配器类中（就像我想的那样），你可以在你的点击监听器代码中执行类似的操作（某些位于方法public void onClick（View arg0）中）：

YourAdapterClassName.this.notifyDataSetChanged();

Answer 3

更新适配器构造函数以接受Fragment作为参数。

类似的东西：

public CustomAdapter(Context context, int id, HomeFragment fragment) {
    this.fragment = fragment;
}

然后使用片段变量调用方法。

fragment.doSomething();

在此方法中，您可以使用notifyDataSetChanged();

刷新列表

如何在适配器的listview项目中单击图像按钮后刷新列表视图？

3 个答案: