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# TrackChangeEvent

`public final class TrackChangeEvent`
`` `extends Event` `implements Parcelable`

java.lang.Object
↳ | android.media.metrics.Event
| ↳ | android.media.metrics.TrackChangeEvent

Playback track change event.

## Summary

### Nested classes
`class` | `TrackChangeEvent.Builder` A builder for `TrackChangeEvent`

### Constants
`int` | `TRACK_CHANGE_REASON_ADAPTIVE` Track change reason for adaptive changes.
`int` | `TRACK_CHANGE_REASON_INITIAL` Track change reason for initial state.
`int` | `TRACK_CHANGE_REASON_MANUAL` Track change reason for manual changes.
`int` | `TRACK_CHANGE_REASON_OTHER` Other track change reason.
`int` | `TRACK_CHANGE_REASON_UNKNOWN` Unknown track change reason.
`int` | `TRACK_STATE_OFF` The track is off.
`int` | `TRACK_STATE_ON` The track is on.
`int` | `TRACK_TYPE_AUDIO` Audio track.
`int` | `TRACK_TYPE_TEXT` Text track.
`int` | `TRACK_TYPE_VIDEO` Video track.

### Inherited constants
From interface `android.os.Parcelable`
`int` | `CONTENTS_FILE_DESCRIPTOR` Descriptor bit used with `describeContents()`: indicates that the Parcelable object's flattened representation includes a file descriptor.
`int` | `PARCELABLE_WRITE_RETURN_VALUE` Flag for use with `writeToParcel(Parcel, int)`: the object being written is a return value, that is the result of a function such as "`Parcelable someFunction()`", "`void someFunction(out Parcelable)`", or "`void someFunction(inout Parcelable)`".

### Fields
`public static final Creator<TrackChangeEvent>` | `CREATOR`

### Public methods
`int` | `describeContents()` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.
`boolean` | `equals(Object o)` Indicates whether some other object is "equal to" this one.
`int` | `getAudioSampleRate()` Gets audio sample rate.
`int` | `getBitrate()` Gets bitrate.
`int` | `getChannelCount()` Gets channel count.
`String` | `getCodecName()` Gets codec name.
`String` | `getContainerMimeType()` Gets container MIME type.
`int` | `getHeight()` Gets video height.
`String` | `getLanguage()` Gets language code.
`String` | `getLanguageRegion()` Gets language region code.
`Bundle` | `getMetricsBundle()` Gets metrics-related information that is not supported by dedicated methods.
`String` | `getSampleMimeType()` Gets the MIME type of the video/audio/text samples.
`long` | `getTimeSinceCreatedMillis()` Gets timestamp since the creation of the log session in milliseconds.
`int` | `getTrackChangeReason()` Gets track change reason.
`int` | `getTrackState()` Gets track state.
`int` | `getTrackType()` Gets the track type.
`float` | `getVideoFrameRate()` Gets video frame rate.
`int` | `getWidth()` Gets video width.
`int` | `hashCode()` Returns a hash code value for the object.
`String` | `toString()` Returns a string representation of the object.
`void` | `writeToParcel(Parcel dest, int flags)` Flatten this object in to a Parcel.

### Inherited methods
From class `android.media.metrics.Event`
`Bundle` | `getMetricsBundle()` Gets metrics-related information that is not supported by dedicated methods.
`long` | `getTimeSinceCreatedMillis()` Gets time since the corresponding log session is created in millisecond.
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `android.os.Parcelable`
`abstract int` | `describeContents()` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.
`abstract void` | `writeToParcel(Parcel dest, int flags)` Flatten this object in to a Parcel.

## Constants

### TRACK_CHANGE_REASON_ADAPTIVE

    public static final int TRACK_CHANGE_REASON_ADAPTIVE

Track change reason for adaptive changes.

Constant Value: 4 (0x00000004)

### TRACK_CHANGE_REASON_INITIAL

    public static final int TRACK_CHANGE_REASON_INITIAL

Track change reason for initial state.

Constant Value: 2 (0x00000002)

### TRACK_CHANGE_REASON_MANUAL

    public static final int TRACK_CHANGE_REASON_MANUAL

Track change reason for manual changes.

Constant Value: 3 (0x00000003)

### TRACK_CHANGE_REASON_OTHER

    public static final int TRACK_CHANGE_REASON_OTHER

Other track change reason.

Constant Value: 1 (0x00000001)

### TRACK_CHANGE_REASON_UNKNOWN

    public static final int TRACK_CHANGE_REASON_UNKNOWN

Unknown track change reason.

Constant Value: 0 (0x00000000)

### TRACK_STATE_OFF

    public static final int TRACK_STATE_OFF

The track is off.

Constant Value: 0 (0x00000000)

### TRACK_STATE_ON

    public static final int TRACK_STATE_ON

The track is on.

Constant Value: 1 (0x00000001)

### TRACK_TYPE_AUDIO

    public static final int TRACK_TYPE_AUDIO

Audio track.

Constant Value: 0 (0x00000000)

### TRACK_TYPE_TEXT

    public static final int TRACK_TYPE_TEXT

Text track.

Constant Value: 2 (0x00000002)

### TRACK_TYPE_VIDEO

    public static final int TRACK_TYPE_VIDEO

Video track.

Constant Value: 1 (0x00000001)

## Fields

### CREATOR

    public static final Creator<TrackChangeEvent> CREATOR

## Public methods

### describeContents

    public int describeContents ()

Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. For example, if the object will include a file descriptor in the output of `writeToParcel(android.os.Parcel, int)`, the return value of this method must include the `CONTENTS_FILE_DESCRIPTOR` bit.

Returns
`int` | a bitmask indicating the set of special object types marshaled by this Parcelable object instance. Value is either `0` or `CONTENTS_FILE_DESCRIPTOR`

### equals

    public boolean equals (Object o)

Indicates whether some other object is "equal to" this one.

The `equals` method implements an equivalence relation on non-null object references:

- It is reflexive: for any non-null reference value `x`, `x.equals(x)` should return `true`.
- It is symmetric: for any non-null reference values `x` and `y`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`.
- It is transitive: for any non-null reference values `x`, `y`, and `z`, if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`.
- It is consistent: for any non-null reference values `x` and `y`, multiple invocations of `x.equals(y)` consistently return `true` or consistently return `false`, provided no information used in `equals` comparisons on the objects is modified.
- For any non-null reference value `x`, `x.equals(null)` should return `false`.

The `equals` method for class `Object` implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values `x` and `y`, this method returns `true` if and only if `x` and `y` refer to the same object (`x == y` has the value `true`).

Note that it is generally necessary to override the `hashCode` method whenever this method is overridden, so as to maintain the general contract for the `hashCode` method, which states that equal objects must have equal hash codes.

Parameters
`o` | `Object`: This value may be `null`.

Returns
`boolean` | `true` if this object is the same as the obj argument; `false` otherwise.

### getAudioSampleRate

    public int getAudioSampleRate ()

Gets audio sample rate.

Returns
`int` | the sample rate, or -1 if unknown. Value is between -1 and Integer.MAX_VALUE inclusive

### getBitrate

    public int getBitrate ()

Gets bitrate.

Returns
`int` | the bitrate, or -1 if unknown. Value is between -1 and Integer.MAX_VALUE inclusive

### getChannelCount

    public int getChannelCount ()

Gets channel count.

Returns
`int` | the channel count, or -1 if unknown. Value is between -1 and Integer.MAX_VALUE inclusive

### getCodecName

    public String getCodecName ()

Gets codec name.

Returns
`String` | This value may be `null`.

### getContainerMimeType

    public String getContainerMimeType ()

Gets container MIME type.

Returns
`String` | This value may be `null`.

### getHeight

    public int getHeight ()

Gets video height.

Returns
`int` | the video height, or -1 if unknown. Value is between -1 and Integer.MAX_VALUE inclusive

### getLanguage

    public String getLanguage ()

Gets language code.

Returns
`String` | a two-letter ISO 639-1 language code. This value may be `null`.

### getLanguageRegion

    public String getLanguageRegion ()

Gets language region code.

Returns
`String` | an IETF BCP 47 optional language region subtag based on a two-letter country code. This value may be `null`.

### getMetricsBundle

    public Bundle getMetricsBundle ()

Gets metrics-related information that is not supported by dedicated methods.

It is intended to be used for backwards compatibility by the metrics infrastructure.

Returns
`Bundle` | This value cannot be `null`.

### getSampleMimeType

    public String getSampleMimeType ()

Gets the MIME type of the video/audio/text samples.

Returns
`String` | This value may be `null`.

### getTimeSinceCreatedMillis

    public long getTimeSinceCreatedMillis ()

Gets timestamp since the creation of the log session in milliseconds.

Returns
`long` | the timestamp since the creation in milliseconds, or -1 if unknown. Value is -1 or greater

See also:

- `LogSessionId`
- `PlaybackSession`
- `RecordingSession`

### getTrackChangeReason

    public int getTrackChangeReason ()

Gets track change reason.

Returns
`int` | Value is `TRACK_CHANGE_REASON_UNKNOWN`, `TRACK_CHANGE_REASON_OTHER`, `TRACK_CHANGE_REASON_INITIAL`, `TRACK_CHANGE_REASON_MANUAL`, or `TRACK_CHANGE_REASON_ADAPTIVE`

### getTrackState

    public int getTrackState ()

Gets track state.

Returns
`int` | Value is `TRACK_STATE_OFF`, or `TRACK_STATE_ON`

### getTrackType

    public int getTrackType ()

Gets the track type.

The track type must be one of `TRACK_TYPE_AUDIO`, `TRACK_TYPE_VIDEO`, `TRACK_TYPE_TEXT`.

Returns
`int` | Value is `TRACK_TYPE_AUDIO`, `TRACK_TYPE_VIDEO`, or `TRACK_TYPE_TEXT`

### getVideoFrameRate

    public float getVideoFrameRate ()

Gets video frame rate.

Returns
`float` | the video frame rate, or -1 if unknown. Value is between -1 and Float.MAX_VALUE inclusive

### getWidth

    public int getWidth ()

Gets video width.

Returns
`int` | the video width, or -1 if unknown. Value is between -1 and Integer.MAX_VALUE inclusive

### hashCode

    public int hashCode ()

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by `HashMap`.

The general contract of `hashCode` is:

- Whenever it is invoked on the same object more than once during an execution of a Java application, the `hashCode` method must consistently return the same integer, provided no information used in `equals` comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
- If two objects are equal according to the `equals(Object)` method, then calling the `hashCode` method on each of the two objects must produce the same integer result.
- It is not required that if two objects are unequal according to the `equals(java.lang.Object)` method, then calling the `hashCode` method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

As much as is reasonably practical, the hashCode method defined by class `Object` does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)

Returns
`int` | a hash code value for this object.

### toString

    public String toString ()

Returns a string representation of the object. In general, the `toString` method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The `toString` method for class `Object` returns a string consisting of the name of the class of which the object is an instance, the at-sign character ``@`', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

>      getClass().getName() + '@' + Integer.toHexString(hashCode())

Returns
`String` | a string representation of the object.

### writeToParcel

    public void writeToParcel (Parcel dest,
                    int flags)

Flatten this object in to a Parcel.

Parameters
`dest` | `Parcel`: This value cannot be `null`.
`flags` | `int`: Additional flags about how the object should be written. May be 0 or `Parcelable.PARCELABLE_WRITE_RETURN_VALUE`. Value is either `0` or a combination of `Parcelable.PARCELABLE_WRITE_RETURN_VALUE`, and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES

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