Java tutorial
/* * Copyright (c) 2010-2016, openHAB.org and others. * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html */ package org.openhab.habdroid.ui; import android.app.Activity; import android.os.Bundle; import android.support.v4.app.ListFragment; import android.support.v4.widget.SwipeRefreshLayout; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ListView; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import org.openhab.habdroid.R; import org.openhab.habdroid.model.OpenHABNotification; import org.openhab.habdroid.util.MyAsyncHttpClient; import org.openhab.habdroid.util.MyHttpClient; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import okhttp3.Call; import okhttp3.Headers; /** * A fragment representing a list of Items. * <p/> * <p/> * Activities containing this fragment MUST implement the {@link OnFragmentInteractionListener} * interface. */ public class OpenHABNotificationFragment extends ListFragment implements SwipeRefreshLayout.OnRefreshListener { private static final String TAG = OpenHABNotificationFragment.class.getSimpleName(); private static final String ARG_USERNAME = "openHABUsername"; private static final String ARG_PASSWORD = "openHABPassword"; private static final String ARG_BASEURL = "openHABBaseUrl"; private String openHABUsername = ""; private String openHABPassword = ""; private String openHABBaseURL = ""; private OpenHABMainActivity mActivity; // loopj private MyAsyncHttpClient mAsyncHttpClient; // keeps track of current request to cancel it in onPause private Call mRequestHandle; private OpenHABNotificationAdapter mNotificationAdapter; private ArrayList<OpenHABNotification> mNotifications; private SwipeRefreshLayout mSwipeLayout; public static OpenHABNotificationFragment newInstance(String baseURL, String username, String password) { OpenHABNotificationFragment fragment = new OpenHABNotificationFragment(); Bundle args = new Bundle(); args.putString(ARG_USERNAME, username); args.putString(ARG_PASSWORD, password); args.putString(ARG_BASEURL, baseURL); fragment.setArguments(args); return fragment; } /** * Mandatory empty constructor for the fragment manager to instantiate the * fragment (e.g. upon screen orientation changes). */ public OpenHABNotificationFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.d(TAG, "onCreate()"); mNotifications = new ArrayList<OpenHABNotification>(); if (getArguments() != null) { openHABUsername = getArguments().getString(ARG_USERNAME); openHABPassword = getArguments().getString(ARG_PASSWORD); openHABBaseURL = getArguments().getString(ARG_BASEURL); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment Log.i(TAG, "onCreateView"); Log.d(TAG, "isAdded = " + isAdded()); View view = inflater.inflate(R.layout.openhabnotificationlist_fragment, container, false); mSwipeLayout = (SwipeRefreshLayout) view.findViewById(R.id.swipe_container); mSwipeLayout.setOnRefreshListener(this); return view; } @Override public void onAttach(Activity activity) { super.onAttach(activity); Log.d(TAG, "onAttach()"); try { mActivity = (OpenHABMainActivity) activity; mAsyncHttpClient = mActivity.getAsyncHttpClient(); mActivity.setTitle(R.string.app_notifications); } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must be OpenHABMainActivity"); } } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mNotificationAdapter = new OpenHABNotificationAdapter(this.getActivity(), R.layout.openhabnotificationlist_item, mNotifications); getListView().setAdapter(mNotificationAdapter); Log.d(TAG, "onActivityCreated()"); Log.d(TAG, "isAdded = " + isAdded()); } @Override public void onViewCreated(View view, Bundle savedInstanceState) { Log.d(TAG, "onViewCreated"); Log.d(TAG, "isAdded = " + isAdded()); super.onViewCreated(view, savedInstanceState); } @Override public void onResume() { super.onResume(); Log.d(TAG, "onResume()"); loadNotifications(); } @Override public void onPause() { super.onPause(); Log.d(TAG, "onPause()"); // Cancel request for notifications if there was any if (mRequestHandle != null) { Thread thread = new Thread(new Runnable() { @Override public void run() { mRequestHandle.cancel(); } }); thread.start(); } } @Override public void onRefresh() { Log.d(TAG, "onRefresh()"); refresh(); } @Override public void onDetach() { super.onDetach(); Log.d(TAG, "onDetach()"); mActivity = null; } public void refresh() { Log.d(TAG, "refresh()"); loadNotifications(); } private void loadNotifications() { if (mAsyncHttpClient != null) { startProgressIndicator(); mRequestHandle = mAsyncHttpClient.get(openHABBaseURL + "/api/v1/notifications?limit=20", new MyHttpClient.ResponseHandler() { @Override public void onSuccess(Call call, int statusCode, Headers headers, byte[] responseBody) { stopProgressIndicator(); Log.d(TAG, "Notifications request success"); try { String jsonString = new String(responseBody, "UTF-8"); JSONArray jsonArray = new JSONArray(jsonString); Log.d(TAG, jsonArray.toString()); mNotifications.clear(); for (int i = 0; i < jsonArray.length(); i++) { try { JSONObject sitemapJson = jsonArray.getJSONObject(i); OpenHABNotification notification = new OpenHABNotification(sitemapJson); mNotifications.add(notification); } catch (JSONException e) { e.printStackTrace(); } } mNotificationAdapter.notifyDataSetChanged(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (JSONException e) { e.printStackTrace(); } } @Override public void onFailure(Call call, int statusCode, Headers headers, byte[] responseBody, Throwable error) { stopProgressIndicator(); Log.d(TAG, "Notifications request failure"); } }); } } private void stopProgressIndicator() { if (mActivity != null) { Log.d(TAG, "Stop progress indicator"); mActivity.setProgressIndicatorVisible(false); } } private void startProgressIndicator() { if (mActivity != null) { Log.d(TAG, "Start progress indicator"); mActivity.setProgressIndicatorVisible(true); } mSwipeLayout.setRefreshing(false); } @Override public void onListItemClick(ListView l, View v, int position, long id) { super.onListItemClick(l, v, position, id); } /** * 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 { public void onFragmentInteraction(String id); } }