BoardActivity.java

package com.merono.g;

import android.app.DialogFragment;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;

import com.android.volley.Response.ErrorListener;
import com.android.volley.Response.Listener;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;

public class BoardActivity extends FragmentActivity {
    private static final String API_URL = "https://api.4chan.org%scatalog.json";

    private String mBoardName;

    private BoardFragment boardFragment;
    private MenuItem refreshItem;

    private ArrayList<String> threadLinks = new ArrayList<String>(15);
    private ArrayList<Post> posts = new ArrayList<Post>(15);

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);

        PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
        SharedPreferences pref = PreferenceManager
                .getDefaultSharedPreferences(this);

        // don't reload on configuration change
        if (savedInstanceState == null) {
            FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
            boardFragment = new BoardFragment();
            ft.replace(android.R.id.content, boardFragment, "board_fragment").commit();

            mBoardName = pref.getString("board", "/g/");
            pref.edit().putString("currentBoard", mBoardName).commit();

            loadThreads(String.format(API_URL, mBoardName));
        } else {
            mBoardName = pref.getString("currentBoard", "/g/");
        }

        getActionBar().setDisplayShowHomeEnabled(false);
        setTitle(mBoardName);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_menu, menu);
        refreshItem = menu.findItem(R.id.refresh);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.refresh:
            refresh();
            return true;
        case R.id.choose_board:
            chooseBoard();
            return true;
        case R.id.settings:
            startActivity(new Intent(this, PrefsActivity.class));
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }

    private void refresh() {
        posts.clear();
        threadLinks.clear();

        setTitle(mBoardName);

        loadThreads(String.format(API_URL, mBoardName));
    }

    private void chooseBoard() {
        DialogFragment boardFragment = new ChooseBoardDialogFragment();
        boardFragment.show(getFragmentManager(), "choose_board_dialog");
    }

    public void switchBoard(String board) {
        mBoardName = Utils.cleanBoardName(board);
        SharedPreferences pref = PreferenceManager
                .getDefaultSharedPreferences(this);
        pref.edit().putString("currentBoard", mBoardName).commit();
        refresh();
    }

    private void loadThreads(String url) {
        setProgressBarIndeterminateVisibility(true);
        if (refreshItem != null) {
            refreshItem.setVisible(false);
        }

        GApplication appState = (GApplication) getApplication();
        appState.mRequestQueue.add(new JsonArrayRequest(url,
                new Listener<JSONArray>() {
                    public void onResponse(JSONArray response) {
                        parseJSON(response);
                        completeLoad();
                    }
                }, new ErrorListener() {
                    public void onErrorResponse(VolleyError error) {
                        posts.add(new Post(error.getMessage()));
                        threadLinks.add(null);
                        completeLoad();
                    }
                }));
        appState.mRequestQueue.start();
    }

    private void completeLoad() {
        // boardFragment is null after config change
        if (boardFragment == null) {
            FragmentManager fm = getSupportFragmentManager();
            boardFragment = (BoardFragment) fm.findFragmentById(android.R.id.content);
        }
        boardFragment.setData(posts, threadLinks);

        setProgressBarIndeterminateVisibility(false);
        if (refreshItem != null) {
            refreshItem.setVisible(true);
        }
    }

    private void parseJSON(JSONArray json) {
        try {
            for (int i = 0; i < json.length(); i++) {
                JSONObject obj = json.getJSONObject(i);
                JSONArray threads = obj.getJSONArray("threads");
                for (int j = 0; j < threads.length(); j++) {
                    JSONObject post = threads.getJSONObject(j);
                    posts.add(new Post(post, mBoardName));
                    threadLinks.add("https://boards.4chan.org" + mBoardName +
                            "res/" + post.getInt("no"));
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}