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 com.google.gson.Gson; import com.google.gson.GsonBuilder; import com.loopj.android.http.AsyncHttpClient; import com.loopj.android.http.AsyncHttpResponseHandler; import com.loopj.android.http.RequestHandle; import cz.msebera.android.httpclient.Header; import org.openhab.habdroid.R; import org.openhab.habdroid.model.OpenHABBinding; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.Arrays; import java.util.Timer; import java.util.TimerTask; public class OpenHABDiscoveryFragment extends ListFragment implements SwipeRefreshLayout.OnRefreshListener { private static final String TAG = OpenHABDiscoveryFragment.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 AsyncHttpClient mAsyncHttpClient; // keeps track of current request to cancel it in onPause private RequestHandle mRequestHandle; private OpenHABDiscoveryAdapter mDiscoveryAdapter; private ArrayList<OpenHABBinding> bindings; private ArrayList<String> discoveries; private ArrayList<OpenHABBinding> discoverableBindings; private SwipeRefreshLayout mSwipeLayout; private int selectedInbox; private Timer discoveryTimer; public static OpenHABDiscoveryFragment newInstance(String baseUrl, String username, String password) { OpenHABDiscoveryFragment fragment = new OpenHABDiscoveryFragment(); Bundle args = new Bundle(); args.putString(ARG_USERNAME, username); args.putString(ARG_PASSWORD, password); args.putString(ARG_BASEURL, baseUrl); fragment.setArguments(args); return fragment; } public OpenHABDiscoveryFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.d(TAG, "onCreate()"); bindings = new ArrayList<OpenHABBinding>(); discoverableBindings = new ArrayList<OpenHABBinding>(); discoveries = new ArrayList<String>(); 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.openhabdiscoverylist_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_discovery); } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must be OpenHABMainActivity"); } } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mDiscoveryAdapter = new OpenHABDiscoveryAdapter(this.getActivity(), R.layout.openhabdiscoverylist_item, discoverableBindings); getListView().setAdapter(mDiscoveryAdapter); // getListView().setEmptyView(getActivity().findViewById(R.id.empty_inbox_view)); Log.d(TAG, "onActivityCreated()"); Log.d(TAG, "isAdded = " + isAdded()); } @Override public void onResume() { super.onResume(); Log.d(TAG, "onResume()"); loadDiscovery(); loadBindings(); } @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(true); } }); 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()"); loadDiscovery(); } @Override public void onListItemClick(ListView l, View v, int position, long id) { activateDiscovery(discoverableBindings.get(position).getId()); } private void loadDiscovery() { if (mAsyncHttpClient != null) { startProgressIndicator(); mRequestHandle = mAsyncHttpClient.get(openHABBaseUrl + "rest/discovery", new AsyncHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) { stopProgressIndicator(); String jsonString = null; try { jsonString = new String(responseBody, "UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } Log.d(TAG, "Discovery request success"); Log.d(TAG, jsonString); GsonBuilder gsonBuilder = new GsonBuilder(); Gson gson = gsonBuilder.create(); discoveries.clear(); discoveries.addAll(Arrays.asList(gson.fromJson(jsonString, String[].class))); updateDiscoverableBindings(); } @Override public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) { stopProgressIndicator(); Log.d(TAG, "Discovery request failure: " + error.getMessage()); } }); } } private void loadBindings() { if (mAsyncHttpClient != null) { startProgressIndicator(); mRequestHandle = mAsyncHttpClient.get(openHABBaseUrl + "rest/bindings", new AsyncHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) { stopProgressIndicator(); String jsonString = null; try { jsonString = new String(responseBody, "UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } Log.d(TAG, "Bindings request success"); Log.d(TAG, jsonString); GsonBuilder gsonBuilder = new GsonBuilder(); Gson gson = gsonBuilder.create(); bindings.clear(); bindings.addAll(Arrays.asList(gson.fromJson(jsonString, OpenHABBinding[].class))); updateDiscoverableBindings(); } @Override public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) { stopProgressIndicator(); Log.d(TAG, "Bindings request failure: " + error.getMessage()); } }); } } private void updateDiscoverableBindings() { discoverableBindings.clear(); for (OpenHABBinding binding : bindings) { Log.d(TAG, "Checking " + binding.getId()); if (discoveries.contains(binding.getId())) { Log.d(TAG, binding.getName() + " is discoverable"); discoverableBindings.add(binding); } else { Log.d(TAG, binding.getName() + " is not discoverable"); } } if (mDiscoveryAdapter != null) { mDiscoveryAdapter.notifyDataSetChanged(); } } private void activateDiscovery(String id) { if (mAsyncHttpClient != null) { startProgressIndicator(); mAsyncHttpClient.post(getActivity(), openHABBaseUrl + "rest/discovery/bindings/" + id + "/scan", null, "text/plain", new AsyncHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) { Log.d(TAG, "Activate discovery request success"); if (discoveryTimer != null) { discoveryTimer.cancel(); discoveryTimer.purge(); discoveryTimer = null; } discoveryTimer = new Timer(); discoveryTimer.schedule(new TimerTask() { @Override public void run() { Log.d(TAG, "Discovery timer ended"); if (getActivity() != null) { getActivity().runOnUiThread(new Runnable() { @Override public void run() { stopProgressIndicator(); if (mActivity != null) { mActivity.openDiscoveryInbox(); } } }); } } }, 10000); } @Override public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) { stopProgressIndicator(); Log.e(TAG, "Activate discovery request error: " + error.getMessage()); } }); } } 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); } }