session-android/app/src/main/java/org/thoughtcrime/securesms/MediaPreviewActivity.java
Niels Andriesse 183f013c31 Show date break header by hour instead of by day
Also ditch relative timestamps in favor of absolute ones
2021-07-08 13:37:08 +10:00

753 lines
26 KiB
Java

/*
* Copyright (C) 2014 Open Whisper Systems
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.thoughtcrime.securesms;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.FrameLayout;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AlertDialog;
import androidx.core.util.Pair;
import androidx.lifecycle.ViewModelProvider;
import androidx.loader.app.LoaderManager;
import androidx.loader.content.Loader;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.viewpager.widget.PagerAdapter;
import androidx.viewpager.widget.ViewPager;
import org.session.libsession.messaging.messages.control.DataExtractionNotification;
import org.session.libsession.messaging.sending_receiving.MessageSender;
import org.session.libsession.messaging.sending_receiving.attachments.DatabaseAttachment;
import org.session.libsession.utilities.Address;
import org.session.libsession.utilities.Util;
import org.session.libsession.utilities.recipients.Recipient;
import org.session.libsession.utilities.recipients.RecipientModifiedListener;
import org.session.libsignal.utilities.Log;
import org.thoughtcrime.securesms.components.MediaView;
import org.thoughtcrime.securesms.database.MediaDatabase.MediaRecord;
import org.thoughtcrime.securesms.database.loaders.PagingMediaLoader;
import org.thoughtcrime.securesms.database.model.MmsMessageRecord;
import org.thoughtcrime.securesms.mediapreview.MediaPreviewViewModel;
import org.thoughtcrime.securesms.mediapreview.MediaRailAdapter;
import org.thoughtcrime.securesms.mms.GlideApp;
import org.thoughtcrime.securesms.mms.GlideRequests;
import org.thoughtcrime.securesms.mms.Slide;
import org.thoughtcrime.securesms.permissions.Permissions;
import org.thoughtcrime.securesms.util.AttachmentUtil;
import org.thoughtcrime.securesms.util.DateUtils;
import org.thoughtcrime.securesms.util.SaveAttachmentTask;
import org.thoughtcrime.securesms.util.SaveAttachmentTask.Attachment;
import java.io.IOException;
import java.util.Locale;
import java.util.WeakHashMap;
import network.loki.messenger.R;
/**
* Activity for displaying media attachments in-app
*/
public class MediaPreviewActivity extends PassphraseRequiredActionBarActivity implements RecipientModifiedListener,
LoaderManager.LoaderCallbacks<Pair<Cursor, Integer>>,
MediaRailAdapter.RailItemListener
{
private final static String TAG = MediaPreviewActivity.class.getSimpleName();
public static final String ADDRESS_EXTRA = "address";
public static final String DATE_EXTRA = "date";
public static final String SIZE_EXTRA = "size";
public static final String CAPTION_EXTRA = "caption";
public static final String OUTGOING_EXTRA = "outgoing";
public static final String LEFT_IS_RECENT_EXTRA = "left_is_recent";
private ViewPager mediaPager;
private View detailsContainer;
private TextView caption;
private View captionContainer;
private RecyclerView albumRail;
private MediaRailAdapter albumRailAdapter;
private ViewGroup playbackControlsContainer;
private Uri initialMediaUri;
private String initialMediaType;
private long initialMediaSize;
private String initialCaption;
private Recipient conversationRecipient;
private boolean leftIsRecent;
private GestureDetector clickDetector;
private MediaPreviewViewModel viewModel;
private ViewPagerListener viewPagerListener;
private int restartItem = -1;
public static Intent getPreviewIntent(Context context, Slide slide, MmsMessageRecord mms, Recipient threadRecipient) {
Intent previewIntent = null;
if (MediaPreviewActivity.isContentTypeSupported(slide.getContentType()) && slide.getUri() != null) {
previewIntent = new Intent(context, MediaPreviewActivity.class);
previewIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
.setDataAndType(slide.getUri(), slide.getContentType())
.putExtra(ADDRESS_EXTRA, threadRecipient.getAddress())
.putExtra(OUTGOING_EXTRA, mms.isOutgoing())
.putExtra(DATE_EXTRA, mms.getTimestamp())
.putExtra(SIZE_EXTRA, slide.asAttachment().getSize())
.putExtra(CAPTION_EXTRA, slide.getCaption().orNull())
.putExtra(LEFT_IS_RECENT_EXTRA, false);
}
return previewIntent;
}
@SuppressWarnings("ConstantConditions")
@Override
protected void onCreate(Bundle bundle, boolean ready) {
viewModel = new ViewModelProvider(this).get(MediaPreviewViewModel.class);
setContentView(R.layout.media_preview_activity);
initializeViews();
initializeResources();
initializeObservers();
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
clickDetector.onTouchEvent(ev);
return super.dispatchTouchEvent(ev);
}
@SuppressLint("MissingSuperCall")
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
Permissions.onRequestPermissionsResult(this, requestCode, permissions, grantResults);
}
@TargetApi(VERSION_CODES.JELLY_BEAN)
private void setFullscreenIfPossible() {
if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN) {
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN);
}
}
@Override
public void onModified(Recipient recipient) {
Util.runOnMain(this::updateActionBar);
}
@Override
public void onRailItemClicked(int distanceFromActive) {
mediaPager.setCurrentItem(mediaPager.getCurrentItem() + distanceFromActive);
}
@Override
public void onRailItemDeleteClicked(int distanceFromActive) {
throw new UnsupportedOperationException("Callback unsupported.");
}
@SuppressWarnings("ConstantConditions")
private void updateActionBar() {
MediaItem mediaItem = getCurrentMediaItem();
if (mediaItem != null) {
CharSequence relativeTimeSpan;
if (mediaItem.date > 0) {
relativeTimeSpan = DateUtils.getDisplayFormattedTimeSpanString(this, Locale.getDefault(), mediaItem.date);
} else {
relativeTimeSpan = getString(R.string.MediaPreviewActivity_draft);
}
if (mediaItem.outgoing) getSupportActionBar().setTitle(getString(R.string.MediaPreviewActivity_you));
else if (mediaItem.recipient != null) getSupportActionBar().setTitle(mediaItem.recipient.toShortString());
else getSupportActionBar().setTitle("");
getSupportActionBar().setSubtitle(relativeTimeSpan);
}
}
@Override
public void onResume() {
super.onResume();
initializeMedia();
}
@Override
public void onPause() {
super.onPause();
restartItem = cleanupMedia();
}
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
setIntent(intent);
initializeResources();
}
private void initializeViews() {
mediaPager = findViewById(R.id.media_pager);
mediaPager.setOffscreenPageLimit(1);
viewPagerListener = new ViewPagerListener();
mediaPager.addOnPageChangeListener(viewPagerListener);
albumRail = findViewById(R.id.media_preview_album_rail);
albumRailAdapter = new MediaRailAdapter(GlideApp.with(this), this, false);
albumRail.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false));
albumRail.setAdapter(albumRailAdapter);
detailsContainer = findViewById(R.id.media_preview_details_container);
caption = findViewById(R.id.media_preview_caption);
captionContainer = findViewById(R.id.media_preview_caption_container);
playbackControlsContainer = findViewById(R.id.media_preview_playback_controls_container);
setSupportActionBar(findViewById(R.id.toolbar));
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setHomeButtonEnabled(true);
}
private void initializeResources() {
Address address = getIntent().getParcelableExtra(ADDRESS_EXTRA);
initialMediaUri = getIntent().getData();
initialMediaType = getIntent().getType();
initialMediaSize = getIntent().getLongExtra(SIZE_EXTRA, 0);
initialCaption = getIntent().getStringExtra(CAPTION_EXTRA);
leftIsRecent = getIntent().getBooleanExtra(LEFT_IS_RECENT_EXTRA, false);
restartItem = -1;
if (address != null) {
conversationRecipient = Recipient.from(this, address, true);
} else {
conversationRecipient = null;
}
}
private void initializeObservers() {
viewModel.getPreviewData().observe(this, previewData -> {
if (previewData == null || mediaPager == null || mediaPager.getAdapter() == null) {
return;
}
View playbackControls = ((MediaItemAdapter) mediaPager.getAdapter()).getPlaybackControls(mediaPager.getCurrentItem());
if (previewData.getAlbumThumbnails().isEmpty() && previewData.getCaption() == null && playbackControls == null) {
detailsContainer.setVisibility(View.GONE);
} else {
detailsContainer.setVisibility(View.VISIBLE);
}
albumRail.setVisibility(previewData.getAlbumThumbnails().isEmpty() ? View.GONE : View.VISIBLE);
albumRailAdapter.setMedia(previewData.getAlbumThumbnails(), previewData.getActivePosition());
albumRail.smoothScrollToPosition(previewData.getActivePosition());
captionContainer.setVisibility(previewData.getCaption() == null ? View.GONE : View.VISIBLE);
caption.setText(previewData.getCaption());
if (playbackControls != null) {
ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
playbackControls.setLayoutParams(params);
playbackControlsContainer.removeAllViews();
playbackControlsContainer.addView(playbackControls);
} else {
playbackControlsContainer.removeAllViews();
}
});
clickDetector = new GestureDetector(new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
if (e.getY() < detailsContainer.getTop()) {
detailsContainer.setVisibility(detailsContainer.getVisibility() == View.VISIBLE ? View.GONE : View.VISIBLE);
}
return super.onSingleTapUp(e);
}
});
}
private void initializeMedia() {
if (!isContentTypeSupported(initialMediaType)) {
Log.w(TAG, "Unsupported media type sent to MediaPreviewActivity, finishing.");
Toast.makeText(getApplicationContext(), R.string.MediaPreviewActivity_unssuported_media_type, Toast.LENGTH_LONG).show();
finish();
}
Log.i(TAG, "Loading Part URI: " + initialMediaUri);
if (conversationRecipient != null) {
getSupportLoaderManager().restartLoader(0, null, this);
} else {
mediaPager.setAdapter(new SingleItemPagerAdapter(this, GlideApp.with(this), getWindow(), initialMediaUri, initialMediaType, initialMediaSize));
if (initialCaption != null) {
detailsContainer.setVisibility(View.VISIBLE);
captionContainer.setVisibility(View.VISIBLE);
caption.setText(initialCaption);
}
}
}
private int cleanupMedia() {
int restartItem = mediaPager.getCurrentItem();
mediaPager.removeAllViews();
mediaPager.setAdapter(null);
return restartItem;
}
private void showOverview() {
Intent intent = new Intent(this, MediaOverviewActivity.class);
intent.putExtra(MediaOverviewActivity.ADDRESS_EXTRA, conversationRecipient.getAddress());
startActivity(intent);
}
private void forward() {
MediaItem mediaItem = getCurrentMediaItem();
if (mediaItem != null) {
Intent composeIntent = new Intent(this, ShareActivity.class);
composeIntent.putExtra(Intent.EXTRA_STREAM, mediaItem.uri);
composeIntent.setType(mediaItem.type);
startActivity(composeIntent);
}
}
@SuppressWarnings("CodeBlock2Expr")
@SuppressLint("InlinedApi")
private void saveToDisk() {
MediaItem mediaItem = getCurrentMediaItem();
if (mediaItem == null) return;
SaveAttachmentTask.showWarningDialog(this, (dialogInterface, i) -> {
Permissions.with(this)
.request(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
.maxSdkVersion(Build.VERSION_CODES.P)
.withPermanentDenialDialog(getString(R.string.MediaPreviewActivity_signal_needs_the_storage_permission_in_order_to_write_to_external_storage_but_it_has_been_permanently_denied))
.onAnyDenied(() -> Toast.makeText(this, R.string.MediaPreviewActivity_unable_to_write_to_external_storage_without_permission, Toast.LENGTH_LONG).show())
.onAllGranted(() -> {
SaveAttachmentTask saveTask = new SaveAttachmentTask(MediaPreviewActivity.this);
long saveDate = (mediaItem.date > 0) ? mediaItem.date : System.currentTimeMillis();
saveTask.executeOnExecutor(
AsyncTask.THREAD_POOL_EXECUTOR,
new Attachment(mediaItem.uri, mediaItem.type, saveDate, null));
if (!mediaItem.outgoing) {
sendMediaSavedNotificationIfNeeded();
}
})
.execute();
});
}
private void sendMediaSavedNotificationIfNeeded() {
if (conversationRecipient.isGroupRecipient()) return;
DataExtractionNotification message = new DataExtractionNotification(new DataExtractionNotification.Kind.MediaSaved(System.currentTimeMillis()));
MessageSender.send(message, conversationRecipient.getAddress());
}
@SuppressLint("StaticFieldLeak")
private void deleteMedia() {
MediaItem mediaItem = getCurrentMediaItem();
if (mediaItem == null || mediaItem.attachment == null) {
return;
}
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setIconAttribute(R.attr.dialog_alert_icon);
builder.setTitle(R.string.MediaPreviewActivity_media_delete_confirmation_title);
builder.setMessage(R.string.MediaPreviewActivity_media_delete_confirmation_message);
builder.setCancelable(true);
builder.setPositiveButton(R.string.delete, (dialogInterface, which) -> {
new AsyncTask<Void, Void, Void>() {
@Override
protected Void doInBackground(Void... voids) {
if (mediaItem.attachment == null) {
return null;
}
AttachmentUtil.deleteAttachment(MediaPreviewActivity.this.getApplicationContext(),
mediaItem.attachment);
return null;
}
}.execute();
finish();
});
builder.setNegativeButton(android.R.string.cancel, null);
builder.show();
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
super.onPrepareOptionsMenu(menu);
menu.clear();
MenuInflater inflater = this.getMenuInflater();
inflater.inflate(R.menu.media_preview, menu);
if (!isMediaInDb()) {
menu.findItem(R.id.media_preview__overview).setVisible(false);
menu.findItem(R.id.delete).setVisible(false);
}
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
super.onOptionsItemSelected(item);
switch (item.getItemId()) {
case R.id.media_preview__overview: showOverview(); return true;
case R.id.media_preview__forward: forward(); return true;
case R.id.save: saveToDisk(); return true;
case R.id.delete: deleteMedia(); return true;
case android.R.id.home: finish(); return true;
}
return false;
}
private boolean isMediaInDb() {
return conversationRecipient != null;
}
private @Nullable MediaItem getCurrentMediaItem() {
MediaItemAdapter adapter = (MediaItemAdapter)mediaPager.getAdapter();
if (adapter != null) {
return adapter.getMediaItemFor(mediaPager.getCurrentItem());
} else {
return null;
}
}
public static boolean isContentTypeSupported(final String contentType) {
return contentType != null && (contentType.startsWith("image/") || contentType.startsWith("video/"));
}
@Override
public @NonNull Loader<Pair<Cursor, Integer>> onCreateLoader(int id, Bundle args) {
return new PagingMediaLoader(this, conversationRecipient, initialMediaUri, leftIsRecent);
}
@Override
public void onLoadFinished(@NonNull Loader<Pair<Cursor, Integer>> loader, @Nullable Pair<Cursor, Integer> data) {
if (data != null) {
@SuppressWarnings("ConstantConditions")
CursorPagerAdapter adapter = new CursorPagerAdapter(this, GlideApp.with(this), getWindow(), data.first, data.second, leftIsRecent);
mediaPager.setAdapter(adapter);
adapter.setActive(true);
viewModel.setCursor(this, data.first, leftIsRecent);
int item = restartItem >= 0 ? restartItem : data.second;
mediaPager.setCurrentItem(item);
if (item == 0) {
viewPagerListener.onPageSelected(0);
}
}
}
@Override
public void onLoaderReset(@NonNull Loader<Pair<Cursor, Integer>> loader) {
}
private class ViewPagerListener implements ViewPager.OnPageChangeListener {
private int currentPage = -1;
@Override
public void onPageSelected(int position) {
if (currentPage != -1 && currentPage != position) onPageUnselected(currentPage);
currentPage = position;
MediaItemAdapter adapter = (MediaItemAdapter)mediaPager.getAdapter();
if (adapter != null) {
MediaItem item = adapter.getMediaItemFor(position);
if (item.recipient != null) item.recipient.addListener(MediaPreviewActivity.this);
viewModel.setActiveAlbumRailItem(MediaPreviewActivity.this, position);
updateActionBar();
}
}
public void onPageUnselected(int position) {
MediaItemAdapter adapter = (MediaItemAdapter)mediaPager.getAdapter();
if (adapter != null) {
MediaItem item = adapter.getMediaItemFor(position);
if (item.recipient != null) item.recipient.removeListener(MediaPreviewActivity.this);
adapter.pause(position);
}
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
}
private static class SingleItemPagerAdapter extends PagerAdapter implements MediaItemAdapter {
private final GlideRequests glideRequests;
private final Window window;
private final Uri uri;
private final String mediaType;
private final long size;
private final LayoutInflater inflater;
SingleItemPagerAdapter(@NonNull Context context, @NonNull GlideRequests glideRequests,
@NonNull Window window, @NonNull Uri uri, @NonNull String mediaType,
long size)
{
this.glideRequests = glideRequests;
this.window = window;
this.uri = uri;
this.mediaType = mediaType;
this.size = size;
this.inflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return 1;
}
@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
return view == object;
}
@Override
public @NonNull Object instantiateItem(@NonNull ViewGroup container, int position) {
View itemView = inflater.inflate(R.layout.media_view_page, container, false);
MediaView mediaView = itemView.findViewById(R.id.media_view);
try {
mediaView.set(glideRequests, window, uri, mediaType, size, true);
} catch (IOException e) {
Log.w(TAG, e);
}
container.addView(itemView);
return itemView;
}
@Override
public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
MediaView mediaView = ((FrameLayout)object).findViewById(R.id.media_view);
mediaView.cleanup();
container.removeView((FrameLayout)object);
}
@Override
public MediaItem getMediaItemFor(int position) {
return new MediaItem(null, null, uri, mediaType, -1, true);
}
@Override
public void pause(int position) {
}
@Override
public @Nullable View getPlaybackControls(int position) {
return null;
}
}
private static class CursorPagerAdapter extends PagerAdapter implements MediaItemAdapter {
private final WeakHashMap<Integer, MediaView> mediaViews = new WeakHashMap<>();
private final Context context;
private final GlideRequests glideRequests;
private final Window window;
private final Cursor cursor;
private final boolean leftIsRecent;
private boolean active;
private int autoPlayPosition;
CursorPagerAdapter(@NonNull Context context, @NonNull GlideRequests glideRequests,
@NonNull Window window, @NonNull Cursor cursor, int autoPlayPosition,
boolean leftIsRecent)
{
this.context = context.getApplicationContext();
this.glideRequests = glideRequests;
this.window = window;
this.cursor = cursor;
this.autoPlayPosition = autoPlayPosition;
this.leftIsRecent = leftIsRecent;
}
public void setActive(boolean active) {
this.active = active;
notifyDataSetChanged();
}
@Override
public int getCount() {
if (!active) return 0;
else return cursor.getCount();
}
@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
return view == object;
}
@Override
public @NonNull Object instantiateItem(@NonNull ViewGroup container, int position) {
View itemView = LayoutInflater.from(context).inflate(R.layout.media_view_page, container, false);
MediaView mediaView = itemView.findViewById(R.id.media_view);
boolean autoplay = position == autoPlayPosition;
int cursorPosition = getCursorPosition(position);
autoPlayPosition = -1;
cursor.moveToPosition(cursorPosition);
MediaRecord mediaRecord = MediaRecord.from(context, cursor);
try {
//noinspection ConstantConditions
mediaView.set(glideRequests, window, mediaRecord.getAttachment().getDataUri(),
mediaRecord.getAttachment().getContentType(), mediaRecord.getAttachment().getSize(), autoplay);
} catch (IOException e) {
Log.w(TAG, e);
}
mediaViews.put(position, mediaView);
container.addView(itemView);
return itemView;
}
@Override
public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
MediaView mediaView = ((FrameLayout)object).findViewById(R.id.media_view);
mediaView.cleanup();
mediaViews.remove(position);
container.removeView((FrameLayout)object);
}
public MediaItem getMediaItemFor(int position) {
cursor.moveToPosition(getCursorPosition(position));
MediaRecord mediaRecord = MediaRecord.from(context, cursor);
Address address = mediaRecord.getAddress();
if (mediaRecord.getAttachment().getDataUri() == null) throw new AssertionError();
return new MediaItem(address != null ? Recipient.from(context, address,true) : null,
mediaRecord.getAttachment(),
mediaRecord.getAttachment().getDataUri(),
mediaRecord.getContentType(),
mediaRecord.getDate(),
mediaRecord.isOutgoing());
}
@Override
public void pause(int position) {
MediaView mediaView = mediaViews.get(position);
if (mediaView != null) mediaView.pause();
}
@Override
public @Nullable View getPlaybackControls(int position) {
MediaView mediaView = mediaViews.get(position);
if (mediaView != null) return mediaView.getPlaybackControls();
return null;
}
private int getCursorPosition(int position) {
if (leftIsRecent) return position;
else return cursor.getCount() - 1 - position;
}
}
private static class MediaItem {
private final @Nullable Recipient recipient;
private final @Nullable DatabaseAttachment attachment;
private final @NonNull Uri uri;
private final @NonNull String type;
private final long date;
private final boolean outgoing;
private MediaItem(@Nullable Recipient recipient,
@Nullable DatabaseAttachment attachment,
@NonNull Uri uri,
@NonNull String type,
long date,
boolean outgoing)
{
this.recipient = recipient;
this.attachment = attachment;
this.uri = uri;
this.type = type;
this.date = date;
this.outgoing = outgoing;
}
}
interface MediaItemAdapter {
MediaItem getMediaItemFor(int position);
void pause(int position);
@Nullable View getPlaybackControls(int position);
}
}