Java tutorial
/* * The MIT License (MIT) * * Copyright (c) 2016 Alec Rietman * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package com.seregil13.literarytracker.lightnovel; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.support.design.widget.CollapsingToolbarLayout; import android.support.v4.app.Fragment; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import com.android.volley.Request; import com.android.volley.Response; import com.android.volley.VolleyError; import com.android.volley.toolbox.JsonObjectRequest; import com.seregil13.literarytracker.R; import com.seregil13.literarytracker.network.ServerInfo; import com.seregil13.literarytracker.network.VolleySingleton; import com.seregil13.literarytracker.util.JsonKeys; import com.seregil13.literarytracker.util.LiteraryTrackerUtils; import com.seregil13.widgetlibrary.WrappedLinearLayout; import org.json.JSONObject; import java.util.ArrayList; /** * A fragment representing a single LightNovel detail screen. * This fragment is either contained in a {@link LightNovelListActivity} * in two-pane mode (on tablets) or a {@link LightNovelDetailActivity} * on handsets. */ public class LightNovelDetailFragment extends Fragment { public static final String TAG = "LNDetailFragment"; /* Views */ private TextView mAuthorTextView; private TextView mCompletedTextView; private TextView mDescriptionTextView; private TextView mTranslatorSiteTextView; private WrappedLinearLayout mGenresLayout; private OnDataFetched mActivity; /** * Mandatory empty constructor for the fragment manager to instantiate the * fragment (e.g. upon screen orientation changes). */ public LightNovelDetailFragment() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments().containsKey(JsonKeys.ID.toString())) { int id = getArguments().getInt(JsonKeys.ID.toString()); String title = getArguments().getString(JsonKeys.TITLE.toString(), "Light Novel"); /* Sends a request for a json object via volley */ requestDetails(id); Activity activity = this.getActivity(); CollapsingToolbarLayout appBarLayout = (CollapsingToolbarLayout) activity .findViewById(R.id.toolbar_layout); if (appBarLayout != null) { appBarLayout.setTitle(title); } } } public void requestDetails(int id) { JsonObjectRequest json = new JsonObjectRequest(Request.Method.GET, ServerInfo.LIGHT_NOVEL.getDetailUrl(id), null, onSuccess, onError); VolleySingleton.getInstance(getActivity().getApplicationContext()).addToRequestQueue(json); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.lightnovel_detail, container, false); mAuthorTextView = (TextView) view.findViewById(R.id.author); mCompletedTextView = (TextView) view.findViewById(R.id.completionStatus); mDescriptionTextView = (TextView) view.findViewById(R.id.description); mTranslatorSiteTextView = (TextView) view.findViewById(R.id.translatorSite); mGenresLayout = (WrappedLinearLayout) view.findViewById(R.id.genres); return view; } @Override public void onAttach(Context context) { super.onAttach(context); this.mActivity = (OnDataFetched) context; } /** * The callback function for a successful network query */ Response.Listener<JSONObject> onSuccess = new Response.Listener<JSONObject>() { @Override public void onResponse(JSONObject response) { try { int mId = response.getInt(JsonKeys.ID.toString()); String mTitle = response.getString(JsonKeys.TITLE.toString()); String mAuthor = response.getString(JsonKeys.AUTHOR.toString()); String mDescription = response.getString(JsonKeys.DESCRIPTION.toString()); String mCompleted = response.getString(JsonKeys.COMPLETED.toString()); String mTranslatorSite = response.getString(JsonKeys.TRANSLATOR_SITE.toString()); ArrayList<String> mGenres = LiteraryTrackerUtils .jsonArrayToList(response.getJSONArray(JsonKeys.GENRES.toString())); mActivity.setData(mId, mTitle, mAuthor, mDescription, mCompleted, mTranslatorSite, mGenres); mAuthorTextView.setText(mAuthor); mCompletedTextView.setText(Boolean.parseBoolean(mCompleted) ? "Completed" : "In Progress"); mDescriptionTextView.setText(mDescription); mTranslatorSiteTextView.setText(mTranslatorSite); mGenresLayout.removeAllViews(); // Removes the existing views mGenresLayout.addTextViews(mGenres); // Adds the new genres to the WrappedLinearLayout ((CollapsingToolbarLayout) getActivity().findViewById(R.id.toolbar_layout)).setTitle(mTitle); } catch (Exception e) { e.printStackTrace(); // TODO: Handle exceptions better } } }; /** * The callback function for a failed network query */ Response.ErrorListener onError = new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Log.d(TAG, error.getMessage()); } }; }