Java tutorial
/* * Copyright (C) 2015 Google Inc. All Rights Reserved. * * 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.libraries.cast.companionlibrary.cast.tracks.ui; import com.google.android.gms.cast.MediaInfo; import com.google.android.gms.cast.MediaTrack; import com.google.android.libraries.cast.companionlibrary.R; import com.google.android.libraries.cast.companionlibrary.cast.VideoCastManager; import com.google.android.libraries.cast.companionlibrary.utils.Utils; import android.annotation.SuppressLint; import android.app.AlertDialog; import android.app.Dialog; import android.content.DialogInterface; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.app.DialogFragment; import android.view.LayoutInflater; import android.view.View; import android.widget.ListView; import android.widget.TabHost; import android.widget.TextView; import java.util.ArrayList; import java.util.List; /** * A dialog to show the available tracks (Text and Audio) for user to select. */ public class TracksChooserDialog extends DialogFragment { private VideoCastManager mCastManager; private long[] mActiveTracks = null; private MediaInfo mMediaInfo; private TracksListAdapter mTextAdapter; private TracksListAdapter mAudioVideoAdapter; private List<MediaTrack> mTextTracks = new ArrayList<>(); private List<MediaTrack> mAudioTracks = new ArrayList<>(); private static final long TEXT_TRACK_NONE_ID = -1; private int mSelectedTextPosition = 0; private int mSelectedAudioPosition = -1; @NonNull @Override public Dialog onCreateDialog(Bundle savedInstanceState) { AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); LayoutInflater inflater = getActivity().getLayoutInflater(); @SuppressLint("InflateParams") View view = inflater.inflate(R.layout.custom_tracks_dialog_layout, null); setUpView(view); builder.setView(view).setPositiveButton(getString(R.string.ccl_ok), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int id) { List<MediaTrack> selectedTracks = new ArrayList<>(); MediaTrack textTrack = mTextAdapter.getSelectedTrack(); if (textTrack.getId() != TEXT_TRACK_NONE_ID) { selectedTracks.add(textTrack); } MediaTrack audioVideoTrack = mAudioVideoAdapter.getSelectedTrack(); if (audioVideoTrack != null) { selectedTracks.add(audioVideoTrack); } mCastManager.notifyTracksSelectedListeners(selectedTracks); TracksChooserDialog.this.getDialog().cancel(); } }).setNegativeButton(R.string.ccl_cancel, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { TracksChooserDialog.this.getDialog().cancel(); } }).setOnCancelListener(new DialogInterface.OnCancelListener() { @Override public void onCancel(DialogInterface dialog) { TracksChooserDialog.this.getDialog().cancel(); } }); return builder.create(); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setRetainInstance(true); Bundle mediaWrapper = getArguments().getBundle(VideoCastManager.EXTRA_MEDIA); mMediaInfo = Utils.bundleToMediaInfo(mediaWrapper); mCastManager = VideoCastManager.getInstance(); mActiveTracks = mCastManager.getActiveTrackIds(); List<MediaTrack> allTracks = mMediaInfo.getMediaTracks(); if (allTracks == null || allTracks.isEmpty()) { Utils.showToast(getActivity(), R.string.ccl_caption_no_tracks_available); dismiss(); } } /** * This is to get around the following bug: * https://code.google.com/p/android/issues/detail?id=17423 */ @Override public void onDestroyView() { if (getDialog() != null && getRetainInstance()) { getDialog().setDismissMessage(null); } super.onDestroyView(); } private void setUpView(View view) { ListView listView1 = (ListView) view.findViewById(R.id.listview1); ListView listView2 = (ListView) view.findViewById(R.id.listview2); TextView textEmptyMessageView = (TextView) view.findViewById(R.id.text_empty_message); TextView audioEmptyMessageView = (TextView) view.findViewById(R.id.audio_empty_message); partitionTracks(); mTextAdapter = new TracksListAdapter(getActivity(), R.layout.tracks_row_layout, mTextTracks, mSelectedTextPosition); mAudioVideoAdapter = new TracksListAdapter(getActivity(), R.layout.tracks_row_layout, mAudioTracks, mSelectedAudioPosition); listView1.setAdapter(mTextAdapter); listView2.setAdapter(mAudioVideoAdapter); TabHost tabs = (TabHost) view.findViewById(R.id.tabhost); tabs.setup(); // create tab 1 TabHost.TabSpec tab1 = tabs.newTabSpec("tab1"); if (mTextTracks == null || mTextTracks.isEmpty()) { listView1.setVisibility(View.INVISIBLE); tab1.setContent(R.id.text_empty_message); } else { textEmptyMessageView.setVisibility(View.INVISIBLE); tab1.setContent(R.id.listview1); } tab1.setIndicator(getString(R.string.ccl_caption_subtitles)); tabs.addTab(tab1); // create tab 2 TabHost.TabSpec tab2 = tabs.newTabSpec("tab2"); if (mAudioTracks == null || mAudioTracks.isEmpty()) { listView2.setVisibility(View.INVISIBLE); tab2.setContent(R.id.audio_empty_message); } else { audioEmptyMessageView.setVisibility(View.INVISIBLE); tab2.setContent(R.id.listview2); } tab2.setIndicator(getString(R.string.ccl_caption_audio)); tabs.addTab(tab2); } private MediaTrack buildNoneTrack() { return new MediaTrack.Builder(TEXT_TRACK_NONE_ID, MediaTrack.TYPE_TEXT) .setName(getString(R.string.ccl_none)).setSubtype(MediaTrack.SUBTYPE_CAPTIONS).setContentId("") .build(); } /** * This method loops through the tracks and partitions them into a group of Text tracks and a * group of Audio tracks, and skips over the Video tracks. */ private void partitionTracks() { List<MediaTrack> allTracks = mMediaInfo.getMediaTracks(); mAudioTracks.clear(); mTextTracks.clear(); mTextTracks.add(buildNoneTrack()); mSelectedTextPosition = 0; mSelectedAudioPosition = -1; if (allTracks != null) { int textPosition = 1; /* start from 1 since we have a NONE selection at the beginning */ int audioPosition = 0; for (MediaTrack track : allTracks) { switch (track.getType()) { case MediaTrack.TYPE_TEXT: mTextTracks.add(track); if (mActiveTracks != null) { for (long mActiveTrack : mActiveTracks) { if (mActiveTrack == track.getId()) { mSelectedTextPosition = textPosition; } } } textPosition++; break; case MediaTrack.TYPE_AUDIO: mAudioTracks.add(track); if (mActiveTracks != null) { for (long mActiveTrack : mActiveTracks) { if (mActiveTrack == track.getId()) { mSelectedAudioPosition = audioPosition; } } } audioPosition++; break; } } } } /** * Call this static method to create a new instance of the dialog. */ public static TracksChooserDialog newInstance(MediaInfo mediaInfo) { TracksChooserDialog fragment = new TracksChooserDialog(); Bundle bundle = new Bundle(); bundle.putBundle(VideoCastManager.EXTRA_MEDIA, Utils.mediaInfoToBundle(mediaInfo)); fragment.setArguments(bundle); return fragment; } }