Added in [API level 37](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels) Summary: [Inherited Constants](https://developer.android.com/reference/android/media/quality/EqualizerBand#inhconstants) \| [Fields](https://developer.android.com/reference/android/media/quality/EqualizerBand#lfields) \| [Ctors](https://developer.android.com/reference/android/media/quality/EqualizerBand#pubctors) \| [Methods](https://developer.android.com/reference/android/media/quality/EqualizerBand#pubmethods) \| [Inherited Methods](https://developer.android.com/reference/android/media/quality/EqualizerBand#inhmethods)
# EqualizerBand
*** ** * ** ***
` public final class EqualizerBand `
` extends https://developer.android.com/reference/java/lang/Object ` ` implements https://developer.android.com/reference/android/os/Parcelable `
|---|---|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||
| ↳ | android.media.quality.EqualizerBand |
*** ** * ** ***
Represents a single band in an equalizer.
An equalizer is composed of multiple bands, each targeting a specific frequency range in the audio spectrum. This parcelable defines the properties of one such band.
## Summary
### Inherited constants
From interface `https://developer.android.com/reference/android/os/Parcelable` `int` `https://developer.android.com/reference/android/os/Parcelable#CONTENTS_FILE_DESCRIPTOR`
Descriptor bit used with `https://developer.android.com/reference/android/os/Parcelable#describeContents()`: indicates that the Parcelable object's flattened representation includes a file descriptor.
`int` `https://developer.android.com/reference/android/os/Parcelable#PARCELABLE_WRITE_RETURN_VALUE`
Flag for use with `https://developer.android.com/reference/android/os/Parcelable#writeToParcel(android.os.Parcel,%20int)`: 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 https://developer.android.com/reference/android/os/Parcelable.Creator` | `https://developer.android.com/reference/android/media/quality/EqualizerBand#CREATOR`
|
| ### Public constructors ||
|---|---|
| ` https://developer.android.com/reference/android/media/quality/EqualizerBand#EqualizerBand(int,%20int,%20float)(int frequencyHz, int gainDb, float qFactor) ` Constructs an EqualizerBand. |
| ### Public methods ||
|---|---|
| ` int` | ` https://developer.android.com/reference/android/media/quality/EqualizerBand#describeContents()() ` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. |
| ` int` | ` https://developer.android.com/reference/android/media/quality/EqualizerBand#getFrequencyHz()() ` Gets the center frequency of the band in Hertz. |
| ` int` | ` https://developer.android.com/reference/android/media/quality/EqualizerBand#getGainDb()() ` Gets the gain for the band in decibels (dB). |
| ` float` | ` https://developer.android.com/reference/android/media/quality/EqualizerBand#getQFactor()() ` Gets the Quality Factor (Q). |
| ` void` | ` https://developer.android.com/reference/android/media/quality/EqualizerBand#writeToParcel(android.os.Parcel,%20int)(https://developer.android.com/reference/android/os/Parcel dest, int flags) ` Flatten this object in to a Parcel. |
### Inherited methods
From class ` https://developer.android.com/reference/java/lang/Object ` ` https://developer.android.com/reference/java/lang/Object` ` https://developer.android.com/reference/java/lang/Object#clone()() `
Creates and returns a copy of this object.
` boolean` ` https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object)(https://developer.android.com/reference/java/lang/Object obj) `
Indicates whether some other object is "equal to" this one.
` void` ` https://developer.android.com/reference/java/lang/Object#finalize()() `
Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
` final https://developer.android.com/reference/java/lang/Class` ` https://developer.android.com/reference/java/lang/Object#getClass()() `
Returns the runtime class of this `Object`.
` int` ` https://developer.android.com/reference/java/lang/Object#hashCode()() `
Returns a hash code value for the object.
` final void` ` https://developer.android.com/reference/java/lang/Object#notify()() `
Wakes up a single thread that is waiting on this object's monitor.
` final void` ` https://developer.android.com/reference/java/lang/Object#notifyAll()() `
Wakes up all threads that are waiting on this object's monitor.
` https://developer.android.com/reference/java/lang/String` ` https://developer.android.com/reference/java/lang/Object#toString()() `
Returns a string representation of the object.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait(long,%20int)(long timeoutMillis, int nanos) `
Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait(long)(long timeoutMillis) `
Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed.
` final void` ` https://developer.android.com/reference/java/lang/Object#wait()() `
Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*.
From interface ` https://developer.android.com/reference/android/os/Parcelable ` ` abstract int` ` https://developer.android.com/reference/android/os/Parcelable#describeContents()() `
Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.
` abstract void` ` https://developer.android.com/reference/android/os/Parcelable#writeToParcel(android.os.Parcel,%20int)(https://developer.android.com/reference/android/os/Parcel dest, int flags) `
Flatten this object in to a Parcel.
## Fields
### CREATOR
Added in [API level 37](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static final Creator CREATOR
```
## Public constructors
### EqualizerBand
Added in [API level 37](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public EqualizerBand (int frequencyHz,
int gainDb,
float qFactor)
```
Constructs an EqualizerBand.
| Parameters ||
|---|---|
| `frequencyHz` | `int`: The center frequency of this band in Hertz (Hz). Value is 1 or greater
|
| `gainDb` | `int`: The gain (level) for this band in decibels (dB).
|
| `qFactor` | `float`: The Quality Factor (Q). Value is 0.0f or greater
|
| Throws ||
|---|---|
| `https://developer.android.com/reference/java/lang/IllegalArgumentException` | if any parameter is out of its supported range. |
## Public methods
### describeContents
Added in [API level 37](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
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 `https://developer.android.com/reference/android/os/Parcelable#writeToParcel(android.os.Parcel,%20int)`, the return value of this method must include the `https://developer.android.com/reference/android/os/Parcelable#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 - `https://developer.android.com/reference/android/os/Parcelable#CONTENTS_FILE_DESCRIPTOR` |
### getFrequencyHz
Added in [API level 37](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int getFrequencyHz ()
```
Gets the center frequency of the band in Hertz.
| Returns ||
|---|---|
| `int` | Value is 1 or greater
|
### getGainDb
Added in [API level 37](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int getGainDb ()
```
Gets the gain for the band in decibels (dB). The range is determined by hardware capabilities. (e.g., -50 to 50 or -100 to 100)
Negative means the signal in this frequency band is reduced, so the output is quieter than the input. (This is used to remove unwanted frequencies like "mud" or "hiss")
Positive means the signal in this frequency band is amplified, so the output is louder than the input.
0 means the signal is unchanged and this is the default state of an equalizer.
| Returns ||
|---|---|
| `int` |
|
### getQFactor
Added in [API level 37](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public float getQFactor ()
```
Gets the Quality Factor (Q).
The Q factor controls the bandwidth (width) of the frequency range affected by this filter It is inversely proportional to bandwidth:
- **High Q (e.g., \> 2.0):** Creates a narrow, sharp curve. Used for precise adjustments (e.g., removing a specific resonant frequency).
- **Low Q (e.g., \< 0.7):** Creates a wide, broad curve. Used for general tonal shaping (e.g., "boosting the bass").
| Returns ||
|---|---|
| `float` | Value is 0.0f or greater
|
### writeToParcel
Added in [API level 37](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
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 `https://developer.android.com/reference/android/os/Parcelable#PARCELABLE_WRITE_RETURN_VALUE`. Value is either `0` or a combination of the following: - `https://developer.android.com/reference/android/os/Parcelable#PARCELABLE_WRITE_RETURN_VALUE` |