NewPipe/app/src/main/java/org/schabi/newpipe/ChannelActivity.java

package org.schabi.newpipe;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.nostra13.universalimageloader.core.ImageLoader;

import org.schabi.newpipe.detail.VideoItemDetailActivity;
import org.schabi.newpipe.detail.VideoItemDetailFragment;
import org.schabi.newpipe.extractor.ChannelExtractor;
import org.schabi.newpipe.extractor.ChannelInfo;
import org.schabi.newpipe.extractor.ExtractionException;
import org.schabi.newpipe.extractor.ParsingException;
import org.schabi.newpipe.extractor.ServiceList;
import org.schabi.newpipe.extractor.StreamPreviewInfo;
import org.schabi.newpipe.extractor.StreamingService;
import org.schabi.newpipe.info_list.InfoListAdapter;

import java.io.IOException;
import java.util.ArrayList;

public class ChannelActivity extends AppCompatActivity {


    private static final String TAG = ChannelActivity.class.toString();
    private View rootView = null;

    // intent const
    public static final String CHANNEL_URL = "channel_url";
    public static final String SERVICE_ID = "service_id";

    private int serviceId = -1;
    private String channelUrl = "";
    private int pageNumber = 0;
    private boolean isLoading = false;

    private ImageLoader imageLoader = ImageLoader.getInstance();
    private InfoListAdapter infoListAdapter = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_channel);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        rootView = findViewById(R.id.rootView);
        setSupportActionBar(toolbar);
        Intent i = getIntent();
        channelUrl = i.getStringExtra(CHANNEL_URL);
        serviceId = i.getIntExtra(SERVICE_ID, -1);

        infoListAdapter = new InfoListAdapter(this, rootView);
        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.channel_streams_view);
        final LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setAdapter(infoListAdapter);
        infoListAdapter.setOnItemSelectedListener(new InfoListAdapter.OnItemSelectedListener() {
            @Override
            public void selected(String url) {
                Intent detailIntent = new Intent(ChannelActivity.this, VideoItemDetailActivity.class);
                detailIntent.putExtra(VideoItemDetailFragment.VIDEO_URL, url);
                detailIntent.putExtra(
                        VideoItemDetailFragment.STREAMING_SERVICE, serviceId);
                startActivity(detailIntent);
            }
        });

        // detect if list has ben scrolled to the bottom
        recyclerView.setOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                int pastVisiblesItems, visibleItemCount, totalItemCount;
                super.onScrolled(recyclerView, dx, dy);
                if(dy > 0) //check for scroll down
                {
                    visibleItemCount = layoutManager.getChildCount();
                    totalItemCount = layoutManager.getItemCount();
                    pastVisiblesItems = layoutManager.findFirstVisibleItemPosition();

                    if ( (visibleItemCount + pastVisiblesItems) >= totalItemCount && !isLoading)
                    {
                        pageNumber++;
                        Log.d(TAG, "bottomn");
                    }
                }
            }
        });

        requestData(pageNumber);
    }



    private void updateUi(final ChannelInfo info) {
        isLoading = false;
        CollapsingToolbarLayout ctl = (CollapsingToolbarLayout) findViewById(R.id.channel_toolbar_layout);
        ProgressBar progressBar = (ProgressBar) findViewById(R.id.progressBar);
        ImageView channelBanner = (ImageView) findViewById(R.id.channel_banner_image);
        FloatingActionButton feedButton = (FloatingActionButton) findViewById(R.id.channel_rss_fab);
        ImageView avatarView = (ImageView) findViewById(R.id.channel_avatar_view);
        ImageView haloView = (ImageView) findViewById(R.id.channel_avatar_halo);

        progressBar.setVisibility(View.GONE);

        if(info.channel_name != null && !info.channel_name.isEmpty()) {
            ctl.setTitle(info.channel_name);
        }

        if(info.banner_url != null && !info.banner_url.isEmpty()) {
            imageLoader.displayImage(info.banner_url, channelBanner,
                    new ImageErrorLoadingListener(this, rootView ,info.service_id));
        }

        if(info.avatar_url != null && !info.avatar_url.isEmpty()) {
            avatarView.setVisibility(View.VISIBLE);
            haloView.setVisibility(View.VISIBLE);
            imageLoader.displayImage(info.avatar_url, avatarView,
                    new ImageErrorLoadingListener(this, rootView ,info.service_id));
        }

        if(info.feed_url != null && !info.feed_url.isEmpty()) {
            feedButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Log.d(TAG, info.feed_url);
                    Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(info.feed_url));
                    startActivity(i);
                }
            });
        } else {
            feedButton.setVisibility(View.GONE);
        }

        initVideos(info);
    }

    private void initVideos(final ChannelInfo info) {
        infoListAdapter.addStreamItemList(info.related_streams);
    }

    private void postNewErrorToast(Handler h, final int stringResource) {
        h.post(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(ChannelActivity.this,
                        stringResource, Toast.LENGTH_LONG).show();
            }
        });
    }

    private void requestData(int page) {
        // start processing
        isLoading = true;
        Thread channelExtractorThread = new Thread(new Runnable() {
            Handler h = new Handler();

            @Override
            public void run() {
                try {
                    StreamingService service = ServiceList.getService(serviceId);
                    ChannelExtractor extractor = service.getChannelExtractorInstance(
                            channelUrl, new Downloader());

                    final ChannelInfo info = ChannelInfo.getInfo(extractor, new Downloader());


                    h.post(new Runnable() {
                        @Override
                        public void run() {
                            updateUi(info);
                        }
                    });

                    // look for non critical errors during extraction
                    if(info != null &&
                            !info.errors.isEmpty()) {
                        Log.e(TAG, "OCCURRED ERRORS DURING EXTRACTION:");
                        for (Throwable e : info.errors) {
                            e.printStackTrace();
                            Log.e(TAG, "------");
                        }
                    }
                } catch(IOException ioe) {
                    postNewErrorToast(h, R.string.network_error);
                    ioe.printStackTrace();
                } catch(ParsingException pe) {
                    pe.printStackTrace();
                } catch(ExtractionException ex) {
                    ex.printStackTrace();
                } catch(Exception e) {
                    e.printStackTrace();
                }
            }
        });

        channelExtractorThread.start();
    }

}