chinwag-android/app/src/main/java/com/keylesspalace/tusky/MainActivity.java

package com.keylesspalace.tusky;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.drawable.Drawable;
import android.support.v4.content.ContextCompat;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

import java.io.IOException;
import java.util.List;

public class MainActivity extends AppCompatActivity implements FetchTimelineListener,
        SwipeRefreshLayout.OnRefreshListener {

    private String domain = null;
    private String accessToken = null;
    private SwipeRefreshLayout swipeRefreshLayout;
    private RecyclerView recyclerView;
    private TimelineAdapter adapter;
    private LinearLayoutManager layoutManager;
    private EndlessOnScrollListener scrollListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        SharedPreferences preferences = getSharedPreferences(
                getString(R.string.preferences_file_key), Context.MODE_PRIVATE);
        domain = preferences.getString("domain", null);
        accessToken = preferences.getString("accessToken", null);
        assert(domain != null);
        assert(accessToken != null);

        // Setup the SwipeRefreshLayout.
        swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout);
        swipeRefreshLayout.setOnRefreshListener(this);
        // Setup the RecyclerView.
        recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
        recyclerView.setHasFixedSize(true);
        layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        DividerItemDecoration divider = new DividerItemDecoration(
                this, layoutManager.getOrientation());
        Drawable drawable = ContextCompat.getDrawable(this, R.drawable.status_divider);
        divider.setDrawable(drawable);
        recyclerView.addItemDecoration(divider);
        scrollListener = new EndlessOnScrollListener(layoutManager) {
            @Override
            public void onLoadMore(int page, int totalItemsCount, RecyclerView view) {
                TimelineAdapter adapter = (TimelineAdapter) view.getAdapter();
                String fromId = adapter.getItem(adapter.getItemCount() - 1).getId();
                sendFetchTimelineRequest(fromId);
            }
        };
        recyclerView.addOnScrollListener(scrollListener);
        adapter = new TimelineAdapter();
        recyclerView.setAdapter(adapter);

        sendFetchTimelineRequest();
    }

    private void sendFetchTimelineRequest(String fromId) {
        new FetchTimelineTask(this, this, domain, accessToken, fromId).execute();
    }

    private void sendFetchTimelineRequest() {
        sendFetchTimelineRequest(null);
    }

    public void onFetchTimelineSuccess(List<Status> statuses, boolean added) {
        if (added) {
            adapter.addItems(statuses);
        } else {
            adapter.update(statuses);
        }
        swipeRefreshLayout.setRefreshing(false);
    }

    public void onFetchTimelineFailure(IOException exception) {
        Toast.makeText(this, R.string.error_fetching_timeline, Toast.LENGTH_SHORT).show();
        swipeRefreshLayout.setRefreshing(false);
    }

    public void onRefresh() {
        sendFetchTimelineRequest();
    }


    private void logOut() {
        SharedPreferences preferences = getSharedPreferences(
                getString(R.string.preferences_file_key), Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = preferences.edit();
        editor.remove("domain");
        editor.remove("accessToken");
        editor.apply();
        Intent intent = new Intent(this, SplashActivity.class);
        startActivity(intent);
        finish();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_toolbar, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_logout: {
                logOut();
                return true;
            }
            default: {
                return super.onOptionsItemSelected(item);
            }
        }
    }
}