com.yelinaung.hn.app.ui.MainActivity.java Source code

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Here is the source code for com.yelinaung.hn.app.ui.MainActivity.java

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/*
 * Copyright 2014 Ye Lin Aung
 *
 * 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.yelinaung.hn.app.ui;

import android.app.ActionBar;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import butterknife.ButterKnife;
import butterknife.InjectView;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.stream.JsonReader;
import com.koushikdutta.async.future.FutureCallback;
import com.koushikdutta.ion.Ion;
import com.yelinaung.hn.app.R;
import com.yelinaung.hn.app.db.StoryDao;
import com.yelinaung.hn.app.model.Story;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;

public class MainActivity extends Activity {

    @InjectView(R.id.list_view)
    ListView mNewsListView;
    @InjectView(R.id.swipe_view)
    SwipeRefreshLayout mSwipeView;

    private ArrayList<Story> stories = new ArrayList<Story>();
    private StoryAdapter storyAdapter;
    private StoryDao storyDao;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.inject(this);

        ActionBar actionBar = getActionBar();
        assert actionBar != null;
        actionBar.setTitle("Hacker News");

        storyDao = new StoryDao(MainActivity.this);

        mSwipeView.setColorScheme(android.R.color.holo_blue_bright, android.R.color.holo_green_light,
                android.R.color.holo_red_light, android.R.color.holo_orange_light);
        mSwipeView.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                loadNews();
            }
        });

        mNewsListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(stories.get(position).link));
                startActivity(browserIntent);
            }
        });
    }

    private void loadNews() {
        mSwipeView.setRefreshing(true);
        Ion.with(MainActivity.this).load("http://hnify.herokuapp.com/get/top").asString()
                .setCallback(new FutureCallback<String>() {
                    @Override
                    public void onCompleted(Exception e, String result) {
                        try {
                            if (e != null)
                                throw e;
                            mSwipeView.setRefreshing(false);
                            JsonParser p = new JsonParser();
                            try {
                                InputStream in = new ByteArrayInputStream(result.getBytes("UTF-8"));
                                JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8"));
                                JsonObject storiesObject = (JsonObject) p.parse(reader);
                                JsonArray storiesJsonArray = storiesObject.getAsJsonArray("stories");
                                Gson gson = new GsonBuilder().create();

                                stories.clear();
                                storyDao.deleteAllStories();

                                for (int i = 0; i < storiesJsonArray.size(); i++) {
                                    Story s = gson.fromJson((storiesJsonArray.get(i)).getAsJsonObject(),
                                            Story.class);
                                    stories.add(s);
                                    storyDao.create(s);
                                }

                                storyAdapter.notifyDataSetChanged();
                            } catch (UnsupportedEncodingException e1) {
                                e1.printStackTrace();
                            }
                        } catch (Exception ex) {
                            ex.printStackTrace();
                            Toast.makeText(MainActivity.this, "Can't connect", Toast.LENGTH_SHORT).show();
                            mSwipeView.setRefreshing(false);
                        }
                    }
                });
    }

    @Override
    protected void onResume() {
        super.onResume();
        stories = (ArrayList<Story>) storyDao.getAll();
        storyAdapter = new StoryAdapter(MainActivity.this, stories);
        mNewsListView.setAdapter(storyAdapter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ButterKnife.reset(this);
    }

    @Override
    protected void onStart() {
        super.onStart();
    }
}