Question

我试图通过网址收到Json Objects的收藏夹列表。

当我获得Json数组时，我定义了方法OnItemLongClickListener和OnItemClickListener，这些方法得到了不同的东西：

OnItemClickListener方法必须打开另一个包含产品描述的活动
OnItemLongClickListener方法必须将产品添加到收藏列表

我在OnItemClickListener中定义的方法MainActivity是我在OnItemLongClickListener中定义的覆盖方法FragmentActivty和方法OnItemLongClickListener的问题。然后我尝试在FragmentActivity中定义两种方法，但之后这两种方法根本不起作用。

有没有办法确定这个问题？

主要活动：

package com.boom.kayakapp.activities;

import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;
import com.boom.kayakapp.R;
import com.boom.kayakapp.adapters.AirlinesAdapter;
import com.boom.kayakapp.controllers.AppController;
import com.boom.kayakapp.fragment.AirlinesFragment;
import com.boom.kayakapp.fragment.FavoriteFragment;
import com.boom.kayakapp.model.Airlines;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends ActionBarActivity {

        private Fragment contentFragment;
        AirlinesFragment airlinesFragment;
        FavoriteFragment favoriteFragment;

        // JSON Node names
        public static final String TAG_NAME = "name";
        public static final String TAG_PHONE = "phone";
        public static final String TAG_SITE = "site";
        public static final String TAG_LOGO = "logoURL";
        public static final String TAG_CODE = "code";

        // Log tag
        private static final String TAG = MainActivity.class.getSimpleName();

        // Airlines json url
        private static final String url = "https://www.kayak.com/h/mobileapis/directory/airlines";

        public ProgressDialog pDialog;
        public List<Airlines> airlinesList = new ArrayList<Airlines>();
        public ListView listView;
        public AirlinesAdapter adapter;

        @Override
        protected void onCreate (Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list);

            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
            StrictMode.setThreadPolicy(policy);

        listView = (ListView) findViewById(R.id.list);
        adapter = new AirlinesAdapter(this, airlinesList);
        listView.setAdapter(adapter);

        pDialog = new ProgressDialog(this);
        // Showing progress dialog before making http request
        pDialog.setMessage("Loading...");
        pDialog.show();

        // Listview on item click listener
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                // getting values from selected ListItem
                String name = ((TextView) view.findViewById(R.id.name))
                        .getText().toString();
                String phone = ((TextView) view.findViewById(R.id.phone))
                        .getText().toString();
                String site = ((TextView) view.findViewById(R.id.site))
                        .getText().toString();
                String logoURL = String.valueOf(((ImageView) view.findViewById(R.id.logoURL)));

                // Starting single contact activity
                Intent in = new Intent(getApplicationContext(),
                        SingleContactActivity.class);
                in.putExtra(TAG_NAME, name);
                in.putExtra(TAG_PHONE, phone);
                in.putExtra(TAG_SITE, site);
                in.putExtra(TAG_LOGO, logoURL);
                startActivity(in);

            }
        });

        // changing action bar color
        getSupportActionBar().setBackgroundDrawable(
                new ColorDrawable(Color.parseColor("#1b1b1b")));

        // Creating volley request obj
        JsonArrayRequest airlinesReq = new JsonArrayRequest(url,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        Log.d(TAG, response.toString());
                        hidePDialog();

                        // Parsing json
                        for (int i = 0; i < response.length(); i++) {
                            try {

                                JSONObject obj = response.getJSONObject(i);
                                Airlines airlines = new Airlines();
                                airlines.setName(obj.getString("name"));
                                airlines.setLogoURL(obj.getString("logoURL"));
                                airlines.setPhone(obj.getString("phone"));
                                airlines.setCode(obj.getInt("code"));
                                airlines.setSite(obj.getString("site"));

                                // adding airlines to movies array
                                airlinesList.add(airlines);

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                        }

                        // notifying list adapter about data changes
                        // so that it renders the list view with updated data
                        adapter.notifyDataSetChanged();
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                VolleyLog.d(TAG, "Error: " + error.getMessage());
                hidePDialog();

            }
        });

        // Adding request to request queue
        AppController.getInstance().addToRequestQueue(airlinesReq);

        FragmentManager fragmentManager = getSupportFragmentManager();

        /*
         * This is called when orientation is changed.
         */
        if (savedInstanceState != null) {
            if (savedInstanceState.containsKey("content")) {
                String content = savedInstanceState.getString("content");
                if (content.equals(FavoriteFragment.ARG_ITEM_ID)) {
                    if (fragmentManager.findFragmentByTag(FavoriteFragment.ARG_ITEM_ID) != null) {
                        setFragmentTitle(R.string.favorites);
                        contentFragment = fragmentManager
                                .findFragmentByTag(FavoriteFragment.ARG_ITEM_ID);
                    }
                }
            }
            if (fragmentManager.findFragmentByTag(AirlinesFragment.ARG_ITEM_ID) != null) {
                airlinesFragment = (AirlinesFragment) fragmentManager
                        .findFragmentByTag(AirlinesFragment.ARG_ITEM_ID);
                contentFragment = airlinesFragment;
            }
        } else {
            airlinesFragment = new AirlinesFragment();
//          setFragmentTitle(R.string.app_name);
            switchContent(airlinesFragment, AirlinesFragment.ARG_ITEM_ID);
        }
    }

        @Override
        public void onDestroy () {
        super.onDestroy();
        hidePDialog();
    }

    private void hidePDialog() {
        if (pDialog != null) {
            pDialog.dismiss();
            pDialog = null;
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        if (contentFragment instanceof FavoriteFragment) {
            outState.putString("content", FavoriteFragment.ARG_ITEM_ID);
        } else {
            outState.putString("content", AirlinesFragment.ARG_ITEM_ID);
        }
        super.onSaveInstanceState(outState);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_favorites:
                setFragmentTitle(R.string.favorites);
                favoriteFragment = new FavoriteFragment();
                switchContent(favoriteFragment, FavoriteFragment.ARG_ITEM_ID);

                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    public void switchContent(Fragment fragment, String tag) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        while (fragmentManager.popBackStackImmediate()) ;

        if (fragment != null) {
            FragmentTransaction transaction = fragmentManager
                    .beginTransaction();
            transaction.replace(R.id.content_frame, fragment, tag);
            //Only FavoriteFragment is added to the back stack.
            if (!(fragment instanceof AirlinesFragment)) {
                transaction.addToBackStack(tag);
            }
            transaction.commit();
            contentFragment = fragment;
        }
    }

    protected void setFragmentTitle(int resourseId) {
        setTitle(resourseId);
        getSupportActionBar().setTitle(resourseId);

    }

    /*
     * We call super.onBackPressed(); when the stack entry count is > 0. if it
     * is instanceof ProductListFragment or if the stack entry count is == 0, then
     * we finish the activity.
     * In other words, from ProductListFragment on back press it quits the app.
     */
    @Override
    public void onBackPressed() {
        FragmentManager fm = getSupportFragmentManager();
        if (fm.getBackStackEntryCount() > 0) {
            super.onBackPressed();
        } else if (contentFragment instanceof AirlinesFragment
                || fm.getBackStackEntryCount() == 0) {
            finish();
        }
    }
}

FragmentActivity：

package com.boom.kayakapp.fragment;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;

import com.boom.kayakapp.R;
import com.boom.kayakapp.adapters.AirlinesAdapter;
import com.boom.kayakapp.model.Airlines;
import com.boom.kayakapp.util.SharedPreference;

import java.util.ArrayList;
import java.util.List;

public class AirlinesFragment extends Fragment implements OnItemClickListener, OnItemLongClickListener{

    public static final String ARG_ITEM_ID = "airlines_list";

    Activity activity;
    ListView airlinesListView;
    List<Airlines> airlines;
    AirlinesAdapter airlinesAdapter;

    public AirlinesFragment() {
        airlines = new ArrayList<>();

    }

    SharedPreference sharedPreference;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        activity = getActivity();
        sharedPreference = new SharedPreference();

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.activity_list, container,
                false);
        findViewsById(view);

        airlinesAdapter = new AirlinesAdapter(activity, airlines);
        airlinesListView.setAdapter(airlinesAdapter);
        airlinesListView.setOnItemClickListener(this);
        airlinesListView.setOnItemLongClickListener(this);
        return view;
    }

    private void findViewsById(View view) {
        airlinesListView = (ListView) view.findViewById(R.id.list);
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {
        Airlines airlines = (Airlines) parent.getItemAtPosition(position);
        Toast.makeText(activity, airlines.toString(), Toast.LENGTH_LONG).show();
    }

    @Override
    public boolean onItemLongClick(AdapterView<?> arg0, View view,
            int position, long arg3) {
        ImageView button = (ImageView) view.findViewById(R.id.favorite_button);

        String tag = button.getTag().toString();
        if (tag.equalsIgnoreCase("grey")) {
            sharedPreference.addFavorite(activity, airlines.get(position));
            Toast.makeText(activity,
                    activity.getResources().getString(R.string.add_favr),
                    Toast.LENGTH_SHORT).show();

            button.setTag("red");
            button.setImageResource(R.drawable.heart_red);
        } else {
            sharedPreference.removeFavorite(activity, airlines.get(position));
            button.setTag("grey");
            button.setImageResource(R.drawable.heart_grey);
            Toast.makeText(activity,
                    activity.getResources().getString(R.string.remove_favr),
                    Toast.LENGTH_SHORT).show();
        }

        return true;
    }

    @Override
    public void onResume() {
        getActivity().setTitle(R.string.app_name);
        super.onResume();
    }
}

Answer 1

以我的方式，我从FavoriteFragment中删除了两个方法的定义，并在MainActivity中定义了它：

Json Array
            listView = (ListView) findViewById(R.id.list);
            adapterAirlines = new AirlinesAdapter(this, airlinesList);
            listView.setAdapter(adapterAirlines);

            pDialog = new ProgressDialog(this);

            // Showing progress dialog before making http request
            pDialog.setMessage("Loading...");
            pDialog.show();

            // Listview OnItemClickListener
            listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view,
                                        int position, long id) {
                    // getting values from selected ListItem
                    String name = ((TextView) view.findViewById(R.id.name))
                            .getText().toString();
                    String phone = ((TextView) view.findViewById(R.id.phone))
                            .getText().toString();
                    String site = ((TextView) view.findViewById(R.id.site))
                            .getText().toString();
                    String logoURL = String.valueOf(((ImageView) view.findViewById(R.id.logoURL)));

                    // Starting single contact activity
                    Intent in = new Intent(getApplicationContext(),
                            SingleContactActivity.class);
                    in.putExtra(TAG_NAME, name);
                    in.putExtra(TAG_PHONE, phone);
                    in.putExtra(TAG_SITE, site);
                    in.putExtra(TAG_LOGO, logoURL);
                    startActivity(in);
                }
            });

            listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
                @Override
                public boolean onItemLongClick(AdapterView<?> parent, View view,
                                               int position, long id) {
                    ImageView button = (ImageView) view.findViewById(R.id.favorite_button);

                    String tag = button.getTag().toString();
                    if (tag.equalsIgnoreCase("grey")) {
                        sharedPreference.addFavorite(MainActivity.this, airlinesList.get(position));
                        Toast.makeText(MainActivity.this,
                                MainActivity.this.getResources().getString(R.string.add_favr),
                                Toast.LENGTH_SHORT).show();

                        button.setTag("red");
                        button.setImageResource(R.drawable.heart_red);
                    } else {
                        sharedPreference.removeFavorite(MainActivity.this, airlinesList.get(position));
                        button.setTag("grey");
                        button.setImageResource(R.drawable.heart_grey);
                        Toast.makeText(MainActivity.this,
                                MainActivity.this.getResources().getString(R.string.remove_favr),
                                Toast.LENGTH_SHORT).show();
                    }
                    return true;
                }
            });

现在可行了

来自JSONParser的方法OnItemClickListener重写来自另一个活动的OnItemLongClickListener

1 个答案: