Java tutorial
/* * Copyright 2015 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.naroran.onsport.fragment; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.database.DataSetObserver; import android.graphics.Color; import android.os.Bundle; import android.os.Handler; import android.support.v4.app.ActivityCompat; import android.support.v4.app.ActivityOptionsCompat; import android.support.v4.app.Fragment; import android.support.v4.util.Pair; import android.support.v4.widget.SwipeRefreshLayout; import android.support.v7.widget.RecyclerView; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.Adapter; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.Toast; import com.android.volley.Cache; import com.android.volley.NetworkResponse; import com.android.volley.ParseError; import com.android.volley.Request; import com.android.volley.Response; import com.android.volley.VolleyError; import com.android.volley.VolleyLog; import com.android.volley.toolbox.HttpHeaderParser; import com.android.volley.toolbox.JsonObjectRequest; import com.naroran.onsport.MainActivity; import com.naroran.onsport.R; import com.naroran.onsport.adapter.NewsAdapter; import com.naroran.onsport.app.AppController; import com.naroran.onsport.data.PostItem; import com.naroran.onsport.util.CacheRequest; import com.naroran.onsport.util.Json; import org.json.JSONException; import org.json.JSONObject; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.List; import java.util.Random; public class CategorySelectionFragment extends Fragment implements AbsListView.OnScrollListener, AdapterView.OnItemClickListener, AdapterView.OnItemLongClickListener { private static final int REQUEST_CATEGORY = 0x2300; private ListView listView; private NewsAdapter listAdapter; private List<PostItem> postItems; private static final String TAG = MainActivity.class.getSimpleName(); private SwipeRefreshLayout mSwipeRefreshLayout; private Adapter mAdapter; private String[] mCatNames; private int offset = 0; public static CategorySelectionFragment newInstance() { return new CategorySelectionFragment(); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View inflate = inflater.inflate(R.layout.fragment_news, container, false); mSwipeRefreshLayout = (SwipeRefreshLayout) inflate.findViewById(R.id.activity_main_swipe_refresh_layout); mCatNames = getResources().getStringArray(R.array.cat_names); mSwipeRefreshLayout.setProgressBackgroundColorSchemeColor(Color.parseColor("#000000")); mSwipeRefreshLayout.setColorSchemeColors(Color.parseColor("#233781"), Color.parseColor("#23814b"), Color.parseColor("#812325")); mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { refreshContent(); } }); listView = (ListView) inflate.findViewById(R.id.activity_main_listview); listView.setDivider(null); postItems = new ArrayList<PostItem>(); return inflate; } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); ((MainActivity) getActivity()).setProgressBarVisibility(View.VISIBLE); listAdapter = new NewsAdapter(getActivity(), postItems); listView.setAdapter(listAdapter); listView.setOnScrollListener(this); listView.setOnItemClickListener(this); listView.setOnItemLongClickListener(this); // Cache cache = AppController.getInstance().getRequestQueue().getCache(); Cache.Entry entry = cache.get(AppController.getInstance().URL_NEWS + "0"); if (entry != null) { try { String data = new String(entry.data, "UTF-8"); try { Json.parseJsonNews(postItems, new JSONObject(data)); listAdapter.notifyDataSetChanged(); ((MainActivity) getActivity()).setProgressBarVisibility(View.GONE); } catch (JSONException e) { e.printStackTrace(); } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } } else { CacheRequest cacheRequest = new CacheRequest(Request.Method.GET, AppController.getInstance().URL_NEWS + "0", new Response.Listener<NetworkResponse>() { @Override public void onResponse(NetworkResponse response) { VolleyLog.d(TAG, "Response: " + response.toString()); try { final String jsonString = new String(response.data, HttpHeaderParser.parseCharset(response.headers)); if (jsonString != null) { Log.d("ANDIS", "Start Transfer"); JSONObject jsonObject = new JSONObject(jsonString); Json.parseJsonNews(postItems, jsonObject); listAdapter.notifyDataSetChanged(); ((MainActivity) getActivity()).setProgressBarVisibility(View.GONE); } } catch (UnsupportedEncodingException | JSONException e) { e.printStackTrace(); } } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { VolleyLog.d(TAG, "Error: " + error.getMessage()); } }); AppController.getInstance().addToRequestQueue(cacheRequest); } } private void refreshContent() { CacheRequest cacheRequest = new CacheRequest(Request.Method.GET, AppController.getInstance().URL_NEWS + "0", new Response.Listener<NetworkResponse>() { @Override public void onResponse(NetworkResponse response) { VolleyLog.d(TAG, "Response: " + response.toString()); try { final String jsonString = new String(response.data, HttpHeaderParser.parseCharset(response.headers)); hideRefresh(); if (jsonString != null) { Log.d("ANDIS", "Start Transfer"); JSONObject jsonObject = new JSONObject(jsonString); Json.parseJsonNewsNew(postItems, jsonObject); listAdapter.notifyDataSetChanged(); ((MainActivity) getActivity()).setProgressBarVisibility(View.GONE); } } catch (UnsupportedEncodingException | JSONException e) { hideRefresh(); e.printStackTrace(); } } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { VolleyLog.d(TAG, "Error: " + error.getMessage()); } }); AppController.getInstance().addToRequestQueue(cacheRequest); } private void hideRefresh() { new Handler().postDelayed(new Runnable() { @Override public void run() { mSwipeRefreshLayout.setRefreshing(false); } }, 1000); } @Override public void onResume() { getActivity().supportStartPostponedEnterTransition(); super.onResume(); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); } public void onItemClick(AdapterView<?> parent, View view, int position, long id) { } public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) { return true; // We've consumed the long click } public void onScrollStateChanged(AbsListView absListView, int i) { // nothing to do for us } private boolean download = false; @SuppressWarnings("unchecked") public void onScroll(AbsListView absListView, int firstVisible, int visibleCount, int totalCount) { boolean loadMore = firstVisible + visibleCount >= totalCount - 1; if (loadMore) { ListAdapter adapter = absListView.getAdapter(); if (adapter instanceof NewsAdapter) { NewsAdapter sta = (NewsAdapter) adapter; if (totalCount > 0 && !download) { offset = totalCount; download = true; mSwipeRefreshLayout.setRefreshing(true); JsonObjectRequest jsonReq = new JsonObjectRequest(Request.Method.GET, AppController.getInstance().URL_NEWS + offset, null, new Response.Listener<JSONObject>() { @Override public void onResponse(JSONObject response) { VolleyLog.d(TAG, "Response: " + response.toString()); if (response != null) { Json.parseJsonNews(postItems, response); listAdapter.notifyDataSetChanged(); hideRefresh(); } else { Toast.makeText(getActivity(), "No News", Toast.LENGTH_LONG).show(); } download = false; } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { VolleyLog.d(TAG, "Error: " + error.getMessage()); } }); AppController.getInstance().addToRequestQueue(jsonReq); sta.notifyDataSetChanged(); } } } } }