Я работаю над проектом, где мне нужно показать видео с использованием библиотеки exoplayer. Сначала я синхронизировал библиотеку exoplayer в Gradle, используя следующее: compile 'com.google.android.exoplayer: exoplayer: 2.7.3'
Я вставил точный код проекта демонстрационного кода exoplayer, но у меня возникла проблема
import com.google.android.exoplayer2.offline.DownloadService;
эта строка имеет красный цвет, тогда как другие компоненты работают нормально.
и, поскольку эта строка не разрешена, приведенный ниже код не работает.
try {
DownloadService.start(this, DemoDownloadService.class);
} catch (IllegalStateException e) {
DownloadService.startForeground(this, DemoDownloadService.class);
}
Ниже приведен код, используемый в SampleChooserActivity.java
package example.com.exoplayer;
import android.content.Context;
import android.content.Intent;
import android.content.res.AssetManager;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.JsonReader;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.exoplayer2.ParserException;
import com.google.android.exoplayer2.RenderersFactory;
import com.google.android.exoplayer2.offline.DownloadService;
import com.google.android.exoplayer2.upstream.DataSource;
import com.google.android.exoplayer2.upstream.DataSourceInputStream;
import com.google.android.exoplayer2.upstream.DataSpec;
import com.google.android.exoplayer2.upstream.DefaultDataSource;
import com.google.android.exoplayer2.util.Assertions;
import com.google.android.exoplayer2.util.Log;
import com.google.android.exoplayer2.util.Util;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
public class SampleChooserActivity extends AppCompatActivity
implements DownloadTracker.Listener, OnChildClickListener {
private static final String TAG = "SampleChooserActivity";
private boolean useExtensionRenderers;
private DownloadTracker downloadTracker;
private SampleAdapter sampleAdapter;
private MenuItem preferExtensionDecodersMenuItem;
private MenuItem randomAbrMenuItem;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sample_chooser);
sampleAdapter = new SampleAdapter();
ExpandableListView sampleListView = findViewById(R.id.sample_list);
sampleListView.setAdapter(sampleAdapter);
sampleListView.setOnChildClickListener(this);
Intent intent = getIntent();
String dataUri = intent.getDataString();
String[] uris;
if (dataUri != null) {
uris = new String[] {dataUri};
} else {
ArrayList<String> uriList = new ArrayList<>();
AssetManager assetManager = getAssets();
try {
for (String asset : assetManager.list("")) {
if (asset.endsWith(".exolist.json")) {
uriList.add("asset:///" + asset);
}
}
} catch (IOException e) {
Toast.makeText(getApplicationContext(), R.string.sample_list_load_error, Toast.LENGTH_LONG)
.show();
}
uris = new String[uriList.size()];
uriList.toArray(uris);
Arrays.sort(uris);
}
DemoApplication application = (DemoApplication) getApplication();
useExtensionRenderers = application.useExtensionRenderers();
downloadTracker = application.getDownloadTracker();
SampleListLoader loaderTask = new SampleListLoader();
loaderTask.execute(uris);
// Start the download service if it should be running but it's not currently.
// Starting the service in the foreground causes notification flicker if there is no scheduled
// action. Starting it in the background throws an exception if the app is in the background too
// (e.g. if device screen is locked).
try {
DownloadService.start(this, DemoDownloadService.class);
} catch (IllegalStateException e) {
DownloadService.startForeground(this, DemoDownloadService.class);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.sample_chooser_menu, menu);
preferExtensionDecodersMenuItem = menu.findItem(R.id.prefer_extension_decoders);
preferExtensionDecodersMenuItem.setVisible(useExtensionRenderers);
randomAbrMenuItem = menu.findItem(R.id.random_abr);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
item.setChecked(!item.isChecked());
return true;
}
@Override
public void onStart() {
super.onStart();
downloadTracker.addListener(this);
sampleAdapter.notifyDataSetChanged();
}
@Override
public void onStop() {
downloadTracker.removeListener(this);
super.onStop();
}
@Override
public void onDownloadsChanged() {
sampleAdapter.notifyDataSetChanged();
}
private void onSampleGroups(final List<SampleGroup> groups, boolean sawError) {
if (sawError) {
Toast.makeText(getApplicationContext(), R.string.sample_list_load_error, Toast.LENGTH_LONG)
.show();
}
sampleAdapter.setSampleGroups(groups);
}
@Override
public boolean onChildClick(
ExpandableListView parent, View view, int groupPosition, int childPosition, long id) {
Sample sample = (Sample) view.getTag();
startActivity(
sample.buildIntent(
/* context= */ this,
isNonNullAndChecked(preferExtensionDecodersMenuItem),
isNonNullAndChecked(randomAbrMenuItem)
? PlayerActivity.ABR_ALGORITHM_RANDOM
: PlayerActivity.ABR_ALGORITHM_DEFAULT));
return true;
}
private void onSampleDownloadButtonClicked(Sample sample) {
int downloadUnsupportedStringId = getDownloadUnsupportedStringId(sample);
if (downloadUnsupportedStringId != 0) {
Toast.makeText(getApplicationContext(), downloadUnsupportedStringId, Toast.LENGTH_LONG)
.show();
} else {
UriSample uriSample = (UriSample) sample;
RenderersFactory renderersFactory =
((DemoApplication) getApplication())
.buildRenderersFactory(isNonNullAndChecked(preferExtensionDecodersMenuItem));
downloadTracker.toggleDownload(
getSupportFragmentManager(),
sample.name,
uriSample.uri,
uriSample.extension,
renderersFactory);
}
}
private int getDownloadUnsupportedStringId(Sample sample) {
if (sample instanceof PlaylistSample) {
return R.string.download_playlist_unsupported;
}
UriSample uriSample = (UriSample) sample;
if (uriSample.drmInfo != null) {
return R.string.download_drm_unsupported;
}
if (uriSample.adTagUri != null) {
return R.string.download_ads_unsupported;
}
String scheme = uriSample.uri.getScheme();
if (!("http".equals(scheme) || "https".equals(scheme))) {
return R.string.download_scheme_unsupported;
}
return 0;
}
private static boolean isNonNullAndChecked(@Nullable MenuItem menuItem) {
// Temporary workaround for layouts that do not inflate the options menu.
return menuItem != null && menuItem.isChecked();
}
private final class SampleListLoader extends AsyncTask<String, Void, List<SampleGroup>> {
private boolean sawError;
@Override
protected List<SampleGroup> doInBackground(String... uris) {
List<SampleGroup> result = new ArrayList<>();
Context context = getApplicationContext();
String userAgent = Util.getUserAgent(context, "ExoPlayerDemo");
DataSource dataSource =
new DefaultDataSource(context, userAgent, /* allowCrossProtocolRedirects= */ false);
for (String uri : uris) {
DataSpec dataSpec = new DataSpec(Uri.parse(uri));
InputStream inputStream = new DataSourceInputStream(dataSource, dataSpec);
try {
readSampleGroups(new JsonReader(new InputStreamReader(inputStream, "UTF-8")), result);
} catch (Exception e) {
Log.e(TAG, "Error loading sample list: " + uri, e);
sawError = true;
} finally {
Util.closeQuietly(dataSource);
}
}
return result;
}
@Override
protected void onPostExecute(List<SampleGroup> result) {
onSampleGroups(result, sawError);
}
private void readSampleGroups(JsonReader reader, List<SampleGroup> groups) throws IOException {
reader.beginArray();
while (reader.hasNext()) {
readSampleGroup(reader, groups);
}
reader.endArray();
}
private void readSampleGroup(JsonReader reader, List<SampleGroup> groups) throws IOException {
String groupName = "";
ArrayList<Sample> samples = new ArrayList<>();
reader.beginObject();
while (reader.hasNext()) {
String name = reader.nextName();
switch (name) {
case "name":
groupName = reader.nextString();
break;
case "samples":
reader.beginArray();
while (reader.hasNext()) {
samples.add(readEntry(reader, false));
}
reader.endArray();
break;
case "_comment":
reader.nextString(); // Ignore.
break;
default:
throw new ParserException("Unsupported name: " + name);
}
}
reader.endObject();
SampleGroup group = getGroup(groupName, groups);
group.samples.addAll(samples);
}
private Sample readEntry(JsonReader reader, boolean insidePlaylist) throws IOException {
String sampleName = null;
Uri uri = null;
String extension = null;
String drmScheme = null;
String drmLicenseUrl = null;
String[] drmKeyRequestProperties = null;
boolean drmMultiSession = false;
ArrayList<UriSample> playlistSamples = null;
String adTagUri = null;
String sphericalStereoMode = null;
reader.beginObject();
while (reader.hasNext()) {
String name = reader.nextName();
switch (name) {
case "name":
sampleName = reader.nextString();
break;
case "uri":
uri = Uri.parse(reader.nextString());
break;
case "extension":
extension = reader.nextString();
break;
case "drm_scheme":
Assertions.checkState(!insidePlaylist, "Invalid attribute on nested item: drm_scheme");
drmScheme = reader.nextString();
break;
case "drm_license_url":
Assertions.checkState(!insidePlaylist,
"Invalid attribute on nested item: drm_license_url");
drmLicenseUrl = reader.nextString();
break;
case "drm_key_request_properties":
Assertions.checkState(!insidePlaylist,
"Invalid attribute on nested item: drm_key_request_properties");
ArrayList<String> drmKeyRequestPropertiesList = new ArrayList<>();
reader.beginObject();
while (reader.hasNext()) {
drmKeyRequestPropertiesList.add(reader.nextName());
drmKeyRequestPropertiesList.add(reader.nextString());
}
reader.endObject();
drmKeyRequestProperties = drmKeyRequestPropertiesList.toArray(new String[0]);
break;
case "drm_multi_session":
drmMultiSession = reader.nextBoolean();
break;
case "playlist":
Assertions.checkState(!insidePlaylist, "Invalid nesting of playlists");
playlistSamples = new ArrayList<>();
reader.beginArray();
while (reader.hasNext()) {
playlistSamples.add((UriSample) readEntry(reader, true));
}
reader.endArray();
break;
case "ad_tag_uri":
adTagUri = reader.nextString();
break;
case "spherical_stereo_mode":
Assertions.checkState(
!insidePlaylist, "Invalid attribute on nested item: spherical_stereo_mode");
sphericalStereoMode = reader.nextString();
break;
default:
throw new ParserException("Unsupported attribute name: " + name);
}
}
reader.endObject();
DrmInfo drmInfo =
drmScheme == null
? null
: new DrmInfo(drmScheme, drmLicenseUrl, drmKeyRequestProperties, drmMultiSession);
if (playlistSamples != null) {
UriSample[] playlistSamplesArray = playlistSamples.toArray(new UriSample[0]);
return new PlaylistSample(sampleName, drmInfo, playlistSamplesArray);
} else {
return new UriSample(
sampleName,
drmInfo,
uri,
extension,
adTagUri,
sphericalStereoMode);
}
}
private SampleGroup getGroup(String groupName, List<SampleGroup> groups) {
for (int i = 0; i < groups.size(); i++) {
if (Util.areEqual(groupName, groups.get(i).title)) {
return groups.get(i);
}
}
SampleGroup group = new SampleGroup(groupName);
groups.add(group);
return group;
}
}
private final class SampleAdapter extends BaseExpandableListAdapter implements OnClickListener {
private List<SampleGroup> sampleGroups;
public SampleAdapter() {
sampleGroups = Collections.emptyList();
}
public void setSampleGroups(List<SampleGroup> sampleGroups) {
this.sampleGroups = sampleGroups;
notifyDataSetChanged();
}
@Override
public Sample getChild(int groupPosition, int childPosition) {
return getGroup(groupPosition).samples.get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
View convertView, ViewGroup parent) {
View view = convertView;
if (view == null) {
view = getLayoutInflater().inflate(R.layout.sample_list_item, parent, false);
View downloadButton = view.findViewById(R.id.download_button);
downloadButton.setOnClickListener(this);
downloadButton.setFocusable(false);
}
initializeChildView(view, getChild(groupPosition, childPosition));
return view;
}
@Override
public int getChildrenCount(int groupPosition) {
return getGroup(groupPosition).samples.size();
}
@Override
public SampleGroup getGroup(int groupPosition) {
return sampleGroups.get(groupPosition);
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
ViewGroup parent) {
View view = convertView;
if (view == null) {
view =
getLayoutInflater()
.inflate(android.R.layout.simple_expandable_list_item_1, parent, false);
}
((TextView) view).setText(getGroup(groupPosition).title);
return view;
}
@Override
public int getGroupCount() {
return sampleGroups.size();
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
@Override
public void onClick(View view) {
onSampleDownloadButtonClicked((Sample) view.getTag());
}
private void initializeChildView(View view, Sample sample) {
view.setTag(sample);
TextView sampleTitle = view.findViewById(R.id.sample_title);
sampleTitle.setText(sample.name);
boolean canDownload = getDownloadUnsupportedStringId(sample) == 0;
boolean isDownloaded = canDownload && downloadTracker.isDownloaded(((UriSample) sample).uri);
ImageButton downloadButton = view.findViewById(R.id.download_button);
downloadButton.setTag(sample);
downloadButton.setColorFilter(
canDownload ? (isDownloaded ? 0xFF42A5F5 : 0xFFBDBDBD) : 0xFFEEEEEE);
downloadButton.setImageResource(
isDownloaded ? R.drawable.ic_download_done : R.drawable.ic_download);
}
}
private static final class SampleGroup {
public final String title;
public final List<Sample> samples;
public SampleGroup(String title) {
this.title = title;
this.samples = new ArrayList<>();
}
}
private static final class DrmInfo {
public final String drmScheme;
public final String drmLicenseUrl;
public final String[] drmKeyRequestProperties;
public final boolean drmMultiSession;
public DrmInfo(
String drmScheme,
String drmLicenseUrl,
String[] drmKeyRequestProperties,
boolean drmMultiSession) {
this.drmScheme = drmScheme;
this.drmLicenseUrl = drmLicenseUrl;
this.drmKeyRequestProperties = drmKeyRequestProperties;
this.drmMultiSession = drmMultiSession;
}
public void updateIntent(Intent intent) {
Assertions.checkNotNull(intent);
intent.putExtra(PlayerActivity.DRM_SCHEME_EXTRA, drmScheme);
intent.putExtra(PlayerActivity.DRM_LICENSE_URL_EXTRA, drmLicenseUrl);
intent.putExtra(PlayerActivity.DRM_KEY_REQUEST_PROPERTIES_EXTRA, drmKeyRequestProperties);
intent.putExtra(PlayerActivity.DRM_MULTI_SESSION_EXTRA, drmMultiSession);
}
}
private abstract static class Sample {
public final String name;
public final DrmInfo drmInfo;
public Sample(String name, DrmInfo drmInfo) {
this.name = name;
this.drmInfo = drmInfo;
}
public Intent buildIntent(
Context context, boolean preferExtensionDecoders, String abrAlgorithm) {
Intent intent = new Intent(context, PlayerActivity.class);
intent.putExtra(PlayerActivity.PREFER_EXTENSION_DECODERS_EXTRA, preferExtensionDecoders);
intent.putExtra(PlayerActivity.ABR_ALGORITHM_EXTRA, abrAlgorithm);
if (drmInfo != null) {
drmInfo.updateIntent(intent);
}
return intent;
}
}
private static final class UriSample extends Sample {
public final Uri uri;
public final String extension;
public final String adTagUri;
public final String sphericalStereoMode;
public UriSample(
String name,
DrmInfo drmInfo,
Uri uri,
String extension,
String adTagUri,
String sphericalStereoMode) {
super(name, drmInfo);
this.uri = uri;
this.extension = extension;
this.adTagUri = adTagUri;
this.sphericalStereoMode = sphericalStereoMode;
}
@Override
public Intent buildIntent(
Context context, boolean preferExtensionDecoders, String abrAlgorithm) {
return super.buildIntent(context, preferExtensionDecoders, abrAlgorithm)
.setData(uri)
.putExtra(PlayerActivity.EXTENSION_EXTRA, extension)
.putExtra(PlayerActivity.AD_TAG_URI_EXTRA, adTagUri)
.putExtra(PlayerActivity.SPHERICAL_STEREO_MODE_EXTRA, sphericalStereoMode)
.setAction(PlayerActivity.ACTION_VIEW);
}
}
private static final class PlaylistSample extends Sample {
public final UriSample[] children;
public PlaylistSample(
String name,
DrmInfo drmInfo,
UriSample... children) {
super(name, drmInfo);
this.children = children;
}
@Override
public Intent buildIntent(
Context context, boolean preferExtensionDecoders, String abrAlgorithm) {
String[] uris = new String[children.length];
String[] extensions = new String[children.length];
for (int i = 0; i < children.length; i++) {
uris[i] = children[i].uri.toString();
extensions[i] = children[i].extension;
}
return super.buildIntent(context, preferExtensionDecoders, abrAlgorithm)
.putExtra(PlayerActivity.URI_LIST_EXTRA, uris)
.putExtra(PlayerActivity.EXTENSION_LIST_EXTRA, extensions)
.setAction(PlayerActivity.ACTION_VIEW_LIST);
}
}
}