content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * 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.google.android.exoplayer2.castdemo;
  
  import android.content.Context;
  import android.os.Bundle;
  import android.view.KeyEvent;
  import android.view.LayoutInflater;
  import android.view.Menu;
  import android.view.View;
  import android.view.View.OnClickListener;
  import android.view.ViewGroup;
  import android.widget.ArrayAdapter;
  import android.widget.ListView;
  import android.widget.TextView;
  import android.widget.Toast;
  import androidx.annotation.Nullable;
  import androidx.appcompat.app.AlertDialog;
  import androidx.appcompat.app.AppCompatActivity;
  import androidx.core.graphics.ColorUtils;
  import androidx.recyclerview.widget.ItemTouchHelper;
  import androidx.recyclerview.widget.LinearLayoutManager;
  import androidx.recyclerview.widget.RecyclerView;
  import androidx.recyclerview.widget.RecyclerView.ViewHolder;
  import com.google.android.exoplayer2.C;
  import com.google.android.exoplayer2.ExoPlayer;
  import com.google.android.exoplayer2.MediaItem;
  import com.google.android.exoplayer2.ui.StyledPlayerView;
  import com.google.android.exoplayer2.util.Assertions;
  import com.google.android.exoplayer2.util.Util;
  import com.google.android.gms.cast.framework.CastButtonFactory;
  import com.google.android.gms.cast.framework.CastContext;
  import com.google.android.gms.dynamite.DynamiteModule;
  
  /**
   * An activity that plays video using {@link ExoPlayer} and supports casting using ExoPlayer's Cast
   * extension.
   */
  public class MainActivity extends AppCompatActivity
      implements OnClickListener, PlayerManager.Listener {
  
    private StyledPlayerView playerView;
    private PlayerManager playerManager;
    private RecyclerView mediaQueueList;
    private MediaQueueListAdapter mediaQueueListAdapter;
    private CastContext castContext;
  
    // Activity lifecycle methods.
  
    @Override
    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      // Getting the cast context later than onStart can cause device discovery not to take place.
      try {
        castContext = CastContext.getSharedInstance(this);
      } catch (RuntimeException e) {
        Throwable cause = e.getCause();
        while (cause != null) {
          if (cause instanceof DynamiteModule.LoadingException) {
            setContentView(R.layout.cast_context_error);
            return;
          }
          cause = cause.getCause();
        }
        // Unknown error. We propagate it.
        throw e;
      }
  
      setContentView(R.layout.main_activity);
  
      playerView = findViewById(R.id.player_view);
      playerView.requestFocus();
  
      mediaQueueList = findViewById(R.id.sample_list);
      ItemTouchHelper helper = new ItemTouchHelper(new RecyclerViewCallback());
      helper.attachToRecyclerView(mediaQueueList);
      mediaQueueList.setLayoutManager(new LinearLayoutManager(this));
      mediaQueueList.setHasFixedSize(true);
      mediaQueueListAdapter = new MediaQueueListAdapter();
  
      findViewById(R.id.add_sample_button).setOnClickListener(this);
    }
  
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
      super.onCreateOptionsMenu(menu);
      getMenuInflater().inflate(R.menu.menu, menu);
      CastButtonFactory.setUpMediaRouteButton(this, menu, R.id.media_route_menu_item);
      return true;
    }
  
    @Override
    public void onResume() {
      super.onResume();
      if (castContext == null) {
        // There is no Cast context to work with. Do nothing.
        return;
      }
      playerManager =
          new PlayerManager(/* listener= */ this, this, playerView, /* context= */ castContext);
      mediaQueueList.setAdapter(mediaQueueListAdapter);
    }
  
    @Override
    public void onPause() {
      super.onPause();
      if (castContext == null) {
        // Nothing to release.
        return;
      }
      mediaQueueListAdapter.notifyItemRangeRemoved(0, mediaQueueListAdapter.getItemCount());
      mediaQueueList.setAdapter(null);
      playerManager.release();
      playerManager = null;
    }
  
    // Activity input.
  
    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
      // If the event was not handled then see if the player view can handle it.
      return super.dispatchKeyEvent(event) || playerManager.dispatchKeyEvent(event);
    }
  
    @Override
    public void onClick(View view) {
      new AlertDialog.Builder(this)
          .setTitle(R.string.add_samples)
          .setView(buildSampleListView())
          .setPositiveButton(android.R.string.ok, null)
          .create()
          .show();
    }
  
    // PlayerManager.Listener implementation.
  
    @Override
    public void onQueuePositionChanged(int previousIndex, int newIndex) {
      if (previousIndex != C.INDEX_UNSET) {
        mediaQueueListAdapter.notifyItemChanged(previousIndex);
      }
      if (newIndex != C.INDEX_UNSET) {
        mediaQueueListAdapter.notifyItemChanged(newIndex);
      }
    }
  
    @Override
    public void onUnsupportedTrack(int trackType) {
      if (trackType == C.TRACK_TYPE_AUDIO) {
        showToast(R.string.error_unsupported_audio);
      } else if (trackType == C.TRACK_TYPE_VIDEO) {
        showToast(R.string.error_unsupported_video);
      }
    }
  
    // Internal methods.
  
    private void showToast(int messageId) {
      Toast.makeText(getApplicationContext(), messageId, Toast.LENGTH_LONG).show();
    }
  
    private View buildSampleListView() {
      View dialogList = getLayoutInflater().inflate(R.layout.sample_list, null);
      ListView sampleList = dialogList.findViewById(R.id.sample_list);
      sampleList.setAdapter(new SampleListAdapter(this));
      sampleList.setOnItemClickListener(
          (parent, view, position, id) -> {
            playerManager.addItem(DemoUtil.SAMPLES.get(position));
            mediaQueueListAdapter.notifyItemInserted(playerManager.getMediaQueueSize() - 1);
          });
      return dialogList;
    }
  
    // Internal classes.
  
    private class MediaQueueListAdapter extends RecyclerView.Adapter<QueueItemViewHolder> {
  
      @Override
      public QueueItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        TextView v =
            (TextView)
                LayoutInflater.from(parent.getContext())
                    .inflate(android.R.layout.simple_list_item_1, parent, false);
        return new QueueItemViewHolder(v);
      }
  
      @Override
      public void onBindViewHolder(QueueItemViewHolder holder, int position) {
        holder.item = Assertions.checkNotNull(playerManager.getItem(position));
  
        TextView view = holder.textView;
        view.setText(holder.item.mediaMetadata.title);
        // TODO: Solve coloring using the theme's ColorStateList.
        view.setTextColor(
            ColorUtils.setAlphaComponent(
                view.getCurrentTextColor(),
                position == playerManager.getCurrentItemIndex() ? 255 : 100));
      }
  
      @Override
      public int getItemCount() {
        return playerManager.getMediaQueueSize();
      }
    }
  
    private class RecyclerViewCallback extends ItemTouchHelper.SimpleCallback {
  
      private int draggingFromPosition;
      private int draggingToPosition;
  
      public RecyclerViewCallback() {
        super(ItemTouchHelper.UP | ItemTouchHelper.DOWN, ItemTouchHelper.START | ItemTouchHelper.END);
        draggingFromPosition = C.INDEX_UNSET;
        draggingToPosition = C.INDEX_UNSET;
      }
  
      @Override
      public boolean onMove(
          RecyclerView list, RecyclerView.ViewHolder origin, RecyclerView.ViewHolder target) {
        int fromPosition = origin.getBindingAdapterPosition();
        int toPosition = target.getBindingAdapterPosition();
        if (draggingFromPosition == C.INDEX_UNSET) {
          // A drag has started, but changes to the media queue will be reflected in clearView().
          draggingFromPosition = fromPosition;
        }
        draggingToPosition = toPosition;
        mediaQueueListAdapter.notifyItemMoved(fromPosition, toPosition);
        return true;
      }
  
      @Override
      public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
        int position = viewHolder.getBindingAdapterPosition();
        QueueItemViewHolder queueItemHolder = (QueueItemViewHolder) viewHolder;
        if (playerManager.removeItem(queueItemHolder.item)) {
          mediaQueueListAdapter.notifyItemRemoved(position);
          // Update whichever item took its place, in case it became the new selected item.
          mediaQueueListAdapter.notifyItemChanged(position);
        }
      }
  
      @Override
      public void clearView(RecyclerView recyclerView, ViewHolder viewHolder) {
        super.clearView(recyclerView, viewHolder);
        if (draggingFromPosition != C.INDEX_UNSET) {
          QueueItemViewHolder queueItemHolder = (QueueItemViewHolder) viewHolder;
          // A drag has ended. We reflect the media queue change in the player.
          if (!playerManager.moveItem(queueItemHolder.item, draggingToPosition)) {
            // The move failed. The entire sequence of onMove calls since the drag started needs to be
            // invalidated.
            mediaQueueListAdapter.notifyDataSetChanged();
          }
        }
        draggingFromPosition = C.INDEX_UNSET;
        draggingToPosition = C.INDEX_UNSET;
      }
    }
  
    private class QueueItemViewHolder extends RecyclerView.ViewHolder implements OnClickListener {
  
      public final TextView textView;
      public MediaItem item;
  
      public QueueItemViewHolder(TextView textView) {
        super(textView);
        this.textView = textView;
        textView.setOnClickListener(this);
      }
  
      @Override
      public void onClick(View v) {
        playerManager.selectQueueItem(getBindingAdapterPosition());
      }
    }
  
    private static final class SampleListAdapter extends ArrayAdapter<MediaItem> {
  
      public SampleListAdapter(Context context) {
        super(context, android.R.layout.simple_list_item_1, DemoUtil.SAMPLES);
      }
  
      @Override
      public View getView(int position, @Nullable View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);
        ((TextView) view).setText(Util.castNonNull(getItem(position)).mediaMetadata.title);
        return view;
      }
    }
  }
  