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TrackSelectionDialogBuilder.java
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TrackSelectionDialogBuilder.java
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/*
* Copyright (C) 2019 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 androidx.media3.ui;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.view.LayoutInflater;
import android.view.View;
import androidx.annotation.Nullable;
import androidx.annotation.StyleRes;
import androidx.media3.common.C;
import androidx.media3.common.Format;
import androidx.media3.common.Player;
import androidx.media3.common.TrackGroup;
import androidx.media3.common.TrackSelectionOverride;
import androidx.media3.common.TrackSelectionParameters;
import androidx.media3.common.Tracks;
import androidx.media3.common.util.UnstableApi;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
/** Builder for a dialog with a {@link TrackSelectionView}. */
@UnstableApi
public final class TrackSelectionDialogBuilder {
/** Callback which is invoked when a track selection has been made. */
public interface DialogCallback {
/**
* Called when tracks are selected.
*
* @param isDisabled Whether the disabled option is selected.
* @param overrides The selected track overrides.
*/
void onTracksSelected(boolean isDisabled, Map<TrackGroup, TrackSelectionOverride> overrides);
}
private final Context context;
private final CharSequence title;
private final List<Tracks.Group> trackGroups;
private final DialogCallback callback;
@StyleRes private int themeResId;
private boolean allowAdaptiveSelections;
private boolean allowMultipleOverrides;
private boolean showDisableOption;
@Nullable private TrackNameProvider trackNameProvider;
private boolean isDisabled;
private ImmutableMap<TrackGroup, TrackSelectionOverride> overrides;
@Nullable private Comparator<Format> trackFormatComparator;
/**
* Creates a builder for a track selection dialog.
*
* @param context The context of the dialog.
* @param title The title of the dialog.
* @param trackGroups The {@link Tracks.Group track groups}.
* @param callback The {@link DialogCallback} invoked when a track selection has been made.
*/
public TrackSelectionDialogBuilder(
Context context,
CharSequence title,
List<Tracks.Group> trackGroups,
DialogCallback callback) {
this.context = context;
this.title = title;
this.trackGroups = ImmutableList.copyOf(trackGroups);
this.callback = callback;
overrides = ImmutableMap.of();
}
/**
* Creates a builder for a track selection dialog.
*
* @param context The context of the dialog.
* @param title The title of the dialog.
* @param player The {@link Player} whose tracks should be selected.
* @param trackType The type of tracks to show for selection.
*/
public TrackSelectionDialogBuilder(
Context context, CharSequence title, Player player, @C.TrackType int trackType) {
this.context = context;
this.title = title;
List<Tracks.Group> allTrackGroups = player.getCurrentTracks().getGroups();
trackGroups = new ArrayList<>();
for (int i = 0; i < allTrackGroups.size(); i++) {
Tracks.Group trackGroup = allTrackGroups.get(i);
if (trackGroup.getType() == trackType) {
trackGroups.add(trackGroup);
}
}
overrides = player.getTrackSelectionParameters().overrides;
callback =
(isDisabled, overrides) -> {
TrackSelectionParameters.Builder parametersBuilder =
player.getTrackSelectionParameters().buildUpon();
parametersBuilder.setTrackTypeDisabled(trackType, isDisabled);
parametersBuilder.clearOverridesOfType(trackType);
for (TrackSelectionOverride override : overrides.values()) {
parametersBuilder.addOverride(override);
}
player.setTrackSelectionParameters(parametersBuilder.build());
};
}
/**
* Sets the resource ID of the theme used to inflate this dialog.
*
* @param themeResId The resource ID of the theme.
* @return This builder, for convenience.
*/
public TrackSelectionDialogBuilder setTheme(@StyleRes int themeResId) {
this.themeResId = themeResId;
return this;
}
/**
* Sets whether the selection is initially shown as disabled.
*
* @param isDisabled Whether the selection is initially shown as disabled.
* @return This builder, for convenience.
*/
public TrackSelectionDialogBuilder setIsDisabled(boolean isDisabled) {
this.isDisabled = isDisabled;
return this;
}
/**
* Sets the single initial override.
*
* @param override The initial override, or {@code null} for no override.
* @return This builder, for convenience.
*/
public TrackSelectionDialogBuilder setOverride(@Nullable TrackSelectionOverride override) {
return setOverrides(
override == null
? Collections.emptyMap()
: ImmutableMap.of(override.mediaTrackGroup, override));
}
/**
* Sets the initial track overrides. Any overrides that do not correspond to track groups that
* were passed to the constructor will be ignored. If {@link #setAllowMultipleOverrides(boolean)}
* hasn't been set to {@code true} then all but one override will be ignored. The retained
* override will be the one whose track group was first in the list of track groups passed to the
* constructor.
*
* @param overrides The initially selected track overrides.
* @return This builder, for convenience.
*/
public TrackSelectionDialogBuilder setOverrides(
Map<TrackGroup, TrackSelectionOverride> overrides) {
this.overrides = ImmutableMap.copyOf(overrides);
return this;
}
/**
* Sets whether adaptive selections (consisting of more than one track) can be made.
*
* <p>For the selection view to enable adaptive selection it is necessary both for this feature to
* be enabled, and for the target renderer to support adaptation between the available tracks.
*
* @param allowAdaptiveSelections Whether adaptive selection is enabled.
* @return This builder, for convenience.
*/
public TrackSelectionDialogBuilder setAllowAdaptiveSelections(boolean allowAdaptiveSelections) {
this.allowAdaptiveSelections = allowAdaptiveSelections;
return this;
}
/**
* Sets whether multiple overrides can be set and selected, i.e. tracks from multiple track groups
* can be selected.
*
* @param allowMultipleOverrides Whether multiple track selection overrides are allowed.
* @return This builder, for convenience.
*/
public TrackSelectionDialogBuilder setAllowMultipleOverrides(boolean allowMultipleOverrides) {
this.allowMultipleOverrides = allowMultipleOverrides;
return this;
}
/**
* Sets whether an option is available for disabling the renderer.
*
* @param showDisableOption Whether the disable option is shown.
* @return This builder, for convenience.
*/
public TrackSelectionDialogBuilder setShowDisableOption(boolean showDisableOption) {
this.showDisableOption = showDisableOption;
return this;
}
/**
* Sets a {@link Comparator} used to determine the display order of the tracks within each track
* group.
*
* @param trackFormatComparator The comparator, or {@code null} to use the original order.
*/
public void setTrackFormatComparator(@Nullable Comparator<Format> trackFormatComparator) {
this.trackFormatComparator = trackFormatComparator;
}
/**
* Sets the {@link TrackNameProvider} used to generate the user visible name of each track and
* updates the view with track names queried from the specified provider.
*
* @param trackNameProvider The {@link TrackNameProvider} to use, or null to use the default.
*/
public TrackSelectionDialogBuilder setTrackNameProvider(
@Nullable TrackNameProvider trackNameProvider) {
this.trackNameProvider = trackNameProvider;
return this;
}
/** Builds the dialog. */
public Dialog build() {
@Nullable Dialog dialog = buildForAndroidX();
return dialog == null ? buildForPlatform() : dialog;
}
private Dialog buildForPlatform() {
AlertDialog.Builder builder = new AlertDialog.Builder(context, themeResId);
// Inflate with the builder's context to ensure the correct style is used.
LayoutInflater dialogInflater = LayoutInflater.from(builder.getContext());
View dialogView = dialogInflater.inflate(R.layout.exo_track_selection_dialog, /* root= */ null);
Dialog.OnClickListener okClickListener = setUpDialogView(dialogView);
return builder
.setTitle(title)
.setView(dialogView)
.setPositiveButton(android.R.string.ok, okClickListener)
.setNegativeButton(android.R.string.cancel, null)
.create();
}
// Reflection calls can't verify null safety of return values or parameters.
@SuppressWarnings("nullness:argument")
@Nullable
private Dialog buildForAndroidX() {
try {
// This method uses reflection to avoid a dependency on AndroidX appcompat that adds 800KB to
// the APK size even with shrinking. See https://issuetracker.google.com/161514204.
Class<?> builderClazz = Class.forName("androidx.appcompat.app.AlertDialog$Builder");
Constructor<?> builderConstructor = builderClazz.getConstructor(Context.class, int.class);
Object builder = builderConstructor.newInstance(context, themeResId);
// Inflate with the builder's context to ensure the correct style is used.
Context builderContext = (Context) builderClazz.getMethod("getContext").invoke(builder);
LayoutInflater dialogInflater = LayoutInflater.from(builderContext);
View dialogView =
dialogInflater.inflate(R.layout.exo_track_selection_dialog, /* root= */ null);
Dialog.OnClickListener okClickListener = setUpDialogView(dialogView);
builderClazz.getMethod("setTitle", CharSequence.class).invoke(builder, title);
builderClazz.getMethod("setView", View.class).invoke(builder, dialogView);
builderClazz
.getMethod("setPositiveButton", int.class, DialogInterface.OnClickListener.class)
.invoke(builder, android.R.string.ok, okClickListener);
builderClazz
.getMethod("setNegativeButton", int.class, DialogInterface.OnClickListener.class)
.invoke(builder, android.R.string.cancel, null);
return (Dialog) builderClazz.getMethod("create").invoke(builder);
} catch (ClassNotFoundException e) {
// Expected if the AndroidX compat library is not available.
return null;
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
private Dialog.OnClickListener setUpDialogView(View dialogView) {
TrackSelectionView selectionView = dialogView.findViewById(R.id.exo_track_selection_view);
selectionView.setAllowMultipleOverrides(allowMultipleOverrides);
selectionView.setAllowAdaptiveSelections(allowAdaptiveSelections);
selectionView.setShowDisableOption(showDisableOption);
if (trackNameProvider != null) {
selectionView.setTrackNameProvider(trackNameProvider);
}
selectionView.init(
trackGroups, isDisabled, overrides, trackFormatComparator, /* listener= */ null);
return (dialog, which) ->
callback.onTracksSelected(selectionView.getIsDisabled(), selectionView.getOverrides());
}
}