# FakeTrackSelection

Artifact: [androidx.media3:media3-test-utils](https://developer.android.com/jetpack/androidx/releases/media3) [View Source](https://cs.android.com/search?q=file:androidx/media3/test/utils/FakeTrackSelection.java+class:androidx.media3.test.utils.FakeTrackSelection)

*** ** * ** ***


```
@UnstableApi
public class FakeTrackSelection extends BaseTrackSelection
```

<br />

|---|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object.html) |||
| ↳ | [androidx.media3.exoplayer.trackselection.BaseTrackSelection](https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection) ||
|   | ↳ | [androidx.media3.test.utils.FakeTrackSelection](https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection) |

*** ** * ** ***

A fake `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection` that supports selecting a subset of tracks within a `https://developer.android.com/reference/androidx/media3/common/TrackGroup`, returns 1 fixed track, and tracks the number of calls to its methods.

## Summary

| ### Public fields |
|---|---|
| `int` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#enableCount()` |
| `boolean` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#isEnabled()` |
| `int` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#releaseCount()` |
| `final int` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#selectedIndex()` |

| ### Public constructors |
|---|
| `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#FakeTrackSelection(androidx.media3.common.TrackGroup)(https://developer.android.com/reference/androidx/media3/common/TrackGroup rendererTrackGroup)` Creates an instance that selects all tracks in the group and defaults the selected index to `0`. |
| `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#FakeTrackSelection(androidx.media3.common.TrackGroup,int)(https://developer.android.com/reference/androidx/media3/common/TrackGroup rendererTrackGroup, int selectedIndex)` Creates an instance that selects all tracks in the group and sets the selected index. |
| `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#FakeTrackSelection(androidx.media3.common.TrackGroup,int[],int)( https://developer.android.com/reference/androidx/media3/common/TrackGroup rendererTrackGroup, int[] tracks, int selectedIndex )` Creates an instance that selects the specified tracks in the group and sets the selected index. |

| ### Public methods |
|---|---|
| `void` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#disable()()` Disables this track selection. |
| `void` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#enable()()` Enables the track selection. |
| `boolean` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#equals(java.lang.Object)(@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/java/lang/Object.html o)` |
| `int` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#evaluateQueueSize(long,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>)(long playbackPositionUs, https://developer.android.com/reference/java/util/List.html<https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/MediaChunk> queue)` Returns the number of chunks that should be retained in the queue. |
| `boolean` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#excludeTrack(int,long)(int index, long exclusionDurationMs)` Attempts to exclude the track at the specified index in the selection, making it ineligible for selection by calls to `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#updateSelectedTrack(long,long,long,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>,androidx.media3.exoplayer.source.chunk.MediaChunkIterator[])` for the specified period of time. |
| `int` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#getSelectedIndex()()` Returns the index of the selected track. |
| `@https://developer.android.com/reference/androidx/annotation/Nullable https://developer.android.com/reference/java/lang/Object.html` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#getSelectionData()()` Returns optional data associated with the current track selection. |
| `int` | `@https://developer.android.com/reference/androidx/media3/common/C.SelectionReason https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#getSelectionReason()()` Returns the reason for the current track selection. |
| `int` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#hashCode()()` |
| `boolean` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#isTrackExcluded(int,long)(int index, long nowMs)` Returns whether the track at the specified index in the selection is excluded. |
| `void` | `https://developer.android.com/reference/androidx/media3/test/utils/FakeTrackSelection#updateSelectedTrack(long,long,long,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>,androidx.media3.exoplayer.source.chunk.MediaChunkIterator[])( long playbackPositionUs, long bufferedDurationUs, long availableDurationUs, https://developer.android.com/reference/java/util/List.html<https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/MediaChunk> queue, MediaChunkIterator[] mediaChunkIterators )` Updates the selected track for sources that load media in discrete `https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/MediaChunk`s. |

| ### Inherited Constants |
|---|
| From [androidx.media3.exoplayer.trackselection.BaseTrackSelection](https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection) |---|---| | `static final https://developer.android.com/reference/java/util/Comparator.html<https://developer.android.com/reference/androidx/media3/common/Format>` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#DEFAULT_FORMAT_COMPARATOR()` The default `https://developer.android.com/reference/androidx/media3/common/Format` comparator, which sorts formats by bitrate in descending order. | |
| From [androidx.media3.exoplayer.trackselection.TrackSelection](https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/TrackSelection) |---|---| | `static final int` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/TrackSelection#TYPE_CUSTOM_BASE() = 10000` The first value that can be used for application specific track selection types. | | `static final int` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/TrackSelection#TYPE_UNSET() = 0` An unspecified track selection type. | |

| ### Inherited fields |
|---|
| From [androidx.media3.exoplayer.trackselection.BaseTrackSelection](https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection) |---|---| | `final https://developer.android.com/reference/androidx/media3/common/TrackGroup` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#group()` The selected `https://developer.android.com/reference/androidx/media3/common/TrackGroup`. | | `final int` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#length()` The number of selected tracks within the `https://developer.android.com/reference/androidx/media3/common/TrackGroup`. | | `boolean` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#playWhenReady()` The current value of whether playback will proceed when ready. | | `final int[]` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#tracks()` The indices of the selected tracks in `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#group()`, in selection order. | | `final int` | `@https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/TrackSelection.Type https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#type()` The type of the selection. | |

| ### Inherited methods |
|---|
| From [androidx.media3.exoplayer.trackselection.BaseTrackSelection](https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection) |---|---| | `void` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#clearTrackExclusions()()` Clears the existing track exclusions. | | `final https://developer.android.com/reference/androidx/media3/common/Format` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#getFormat(int)(int index)` Returns the format of the track at a given index in the selection. | | `final int` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#getIndexInTrackGroup(int)(int index)` Returns the index in the track group of the track at a given index in the selection. | | `final boolean` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#getPlayWhenReady()()` Returns whether the playback using this track selection will proceed when ready. | | `final https://developer.android.com/reference/androidx/media3/common/Format` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#getSelectedFormat()()` Returns the `https://developer.android.com/reference/androidx/media3/common/Format` of the individual selected track. | | `final int` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#getSelectedIndexInTrackGroup()()` Returns the index in the track group of the individual selected track. | | `final https://developer.android.com/reference/androidx/media3/common/TrackGroup` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#getTrackGroup()()` Returns the `https://developer.android.com/reference/androidx/media3/common/TrackGroup` to which the selected tracks belong. | | `final int` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#getType()()` Returns an integer specifying the type of the selection, or `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/TrackSelection#TYPE_UNSET()` if not specified. | | `final int` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#indexOf(androidx.media3.common.Format)(https://developer.android.com/reference/androidx/media3/common/Format format)` Returns the index in the selection of the track with the specified format. | | `final int` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#indexOf(int)(int indexInTrackGroup)` Returns the index in the selection of the track with the specified index in the track group. | | `final int` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#length()()` Returns the number of tracks in the selection. | | `void` | `@https://developer.android.com/reference/androidx/annotation/CallSuper https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#onPlayWhenReadyChanged(boolean)(boolean playWhenReady)` Called to notify when the playback is paused or resumed. | | `void` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/BaseTrackSelection#onPlaybackSpeed(float)(float playbackSpeed)` Called to notify the selection of the current playback speed. | |
| From [androidx.media3.exoplayer.trackselection.ExoTrackSelection](https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection) |---|---| | `long` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#getLatestBitrateEstimate()()` Returns the most recent bitrate estimate utilised for track selection. | | `void` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#onDiscontinuity()()` Called to notify the selection of a position discontinuity. | | `void` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#onRebuffer()()` Called to notify when a rebuffer occurred. | | `boolean` | `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#shouldCancelChunkLoad(long,androidx.media3.exoplayer.source.chunk.Chunk,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>)( long playbackPositionUs, https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/Chunk loadingChunk, https://developer.android.com/reference/java/util/List.html<https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/MediaChunk> queue )` Returns whether an ongoing load of a chunk should be canceled. | |

## Public fields

### enableCount

```
public int enableCount
```

### isEnabled

```
public boolean isEnabled
```

### releaseCount

```
public int releaseCount
```

### selectedIndex

```
public final int selectedIndex
```

## Public constructors

### FakeTrackSelection

```
public FakeTrackSelection(TrackGroup rendererTrackGroup)
```

Creates an instance that selects all tracks in the group and defaults the selected index to `0`.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/media3/common/TrackGroup rendererTrackGroup` | The `https://developer.android.com/reference/androidx/media3/common/TrackGroup` to select from. |

### FakeTrackSelection

```
public FakeTrackSelection(TrackGroup rendererTrackGroup, int selectedIndex)
```

Creates an instance that selects all tracks in the group and sets the selected index.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/media3/common/TrackGroup rendererTrackGroup` | The `https://developer.android.com/reference/androidx/media3/common/TrackGroup` to select from. |
| `int selectedIndex` | The index of the selected track within the group. |

### FakeTrackSelection

```
public FakeTrackSelection(
    TrackGroup rendererTrackGroup,
    int[] tracks,
    int selectedIndex
)
```

Creates an instance that selects the specified tracks in the group and sets the selected index.

| Parameters |
|---|---|
| `https://developer.android.com/reference/androidx/media3/common/TrackGroup rendererTrackGroup` | The `https://developer.android.com/reference/androidx/media3/common/TrackGroup` to select from. |
| `int[] tracks` | The indices of the selected tracks in the group. |
| `int selectedIndex` | The index of the selected track within the `tracks` array. |

## Public methods

### disable

```
public void disable()
```

Disables this track selection. No further dynamic changes via `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#updateSelectedTrack(long,long,long,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>,androidx.media3.exoplayer.source.chunk.MediaChunkIterator[])`, `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#evaluateQueueSize(long,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>)` or `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#shouldCancelChunkLoad(long,androidx.media3.exoplayer.source.chunk.Chunk,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>)` will happen after this call.

This method may only be called when the track selection is already enabled.

### enable

```
public void enable()
```

Enables the track selection. Dynamic changes via `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#updateSelectedTrack(long,long,long,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>,androidx.media3.exoplayer.source.chunk.MediaChunkIterator[])`, `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#evaluateQueueSize(long,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>)` or `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#shouldCancelChunkLoad(long,androidx.media3.exoplayer.source.chunk.Chunk,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>)` will only happen after this call.

This method may not be called when the track selection is already enabled.

### equals

```
public boolean equals(@Nullable Object o)
```

### evaluateQueueSize

```
public int evaluateQueueSize(long playbackPositionUs, List<MediaChunk> queue)
```

Returns the number of chunks that should be retained in the queue.

May be called by sources that load media in discrete `https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/MediaChunk` and support discarding of buffered chunks.

To avoid excessive re-buffering, implementations should normally return the size of the queue. An example of a case where a smaller value may be returned is if network conditions have improved dramatically, allowing chunks to be discarded and re-buffered in a track of significantly higher quality. Discarding chunks may allow faster switching to a higher quality track in this case.

Note that even if the source supports discarding of buffered chunks, the actual number of discarded chunks is not guaranteed. The source will call `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#updateSelectedTrack(long,long,long,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>,androidx.media3.exoplayer.source.chunk.MediaChunkIterator[])` with the updated queue of chunks before loading a new chunk to allow switching to another quality.

This method will only be called when the selection is enabled and none of the `https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/MediaChunk` in the queue are currently loading.

| Parameters |
|---|---|
| `long playbackPositionUs` | The current playback position in microseconds. If playback of the period to which this track selection belongs has not yet started, the value will be the starting position in the period minus the duration of any media in previous periods still to be played. |
| `https://developer.android.com/reference/java/util/List.html<https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/MediaChunk> queue` | The queue of buffered `https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/MediaChunk`. Must not be modified. |

| Returns |
|---|---|
| `int` | The number of chunks to retain in the queue. |

### excludeTrack

```
public boolean excludeTrack(int index, long exclusionDurationMs)
```

Attempts to exclude the track at the specified index in the selection, making it ineligible for selection by calls to `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#updateSelectedTrack(long,long,long,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>,androidx.media3.exoplayer.source.chunk.MediaChunkIterator[])` for the specified period of time.

Exclusion will fail if all other tracks are currently excluded. If excluding the currently selected track, note that it will remain selected until the next call to `https://developer.android.com/reference/androidx/media3/exoplayer/trackselection/ExoTrackSelection#updateSelectedTrack(long,long,long,java.util.List<? extends androidx.media3.exoplayer.source.chunk.MediaChunk>,androidx.media3.exoplayer.source.chunk.MediaChunkIterator[])`.

This method will only be called when the selection is enabled.

| Parameters |
|---|---|
| `int index` | The index of the track in the selection. |
| `long exclusionDurationMs` | The duration of time for which the track should be excluded, in milliseconds. |

| Returns |
|---|---|
| `boolean` | Whether exclusion was successful. |

### getSelectedIndex

```
public int getSelectedIndex()
```

Returns the index of the selected track.

### getSelectionData

```
public @Nullable Object getSelectionData()
```

Returns optional data associated with the current track selection.

### getSelectionReason

```
@C.SelectionReason
public int getSelectionReason()
```

Returns the reason for the current track selection.

### hashCode

```
public int hashCode()
```

### isTrackExcluded

```
public boolean isTrackExcluded(int index, long nowMs)
```

Returns whether the track at the specified index in the selection is excluded.

| Parameters |
|---|---|
| `int index` | The index of the track in the selection. |
| `long nowMs` | The current time in the timebase of `https://developer.android.com/reference/android/os/SystemClock.html#elapsedRealtime()`. |

### updateSelectedTrack

```
public void updateSelectedTrack(
    long playbackPositionUs,
    long bufferedDurationUs,
    long availableDurationUs,
    List<MediaChunk> queue,
    MediaChunkIterator[] mediaChunkIterators
)
```

Updates the selected track for sources that load media in discrete `https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/MediaChunk`s.

This method will only be called when the selection is enabled.

| Parameters |
|---|---|
| `long playbackPositionUs` | The current playback position in microseconds. If playback of the period to which this track selection belongs has not yet started, the value will be the starting position in the period minus the duration of any media in previous periods still to be played. |
| `long bufferedDurationUs` | The duration of media currently buffered from the current playback position, in microseconds. Note that the next load position can be calculated as ` (playbackPositionUs + bufferedDurationUs)`. |
| `long availableDurationUs` | The duration of media available for buffering from the current playback position, in microseconds, or `https://developer.android.com/reference/androidx/media3/common/C#TIME_UNSET()` if media can be buffered to the end of the current period. Note that if not set to `https://developer.android.com/reference/androidx/media3/common/C#TIME_UNSET()`, the position up to which media is available for buffering can be calculated as `(playbackPositionUs + availableDurationUs)`. |
| `https://developer.android.com/reference/java/util/List.html<https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/MediaChunk> queue` | The queue of already buffered `https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/MediaChunk`s. Must not be modified. |
| `MediaChunkIterator[] mediaChunkIterators` | An array of `https://developer.android.com/reference/androidx/media3/exoplayer/source/chunk/MediaChunkIterator`s providing information about the sequence of upcoming media chunks for each track in the selection. All iterators start from the media chunk which will be loaded next if the respective track is selected. Note that this information may not be available for all tracks, and so some iterators may be empty. |