Summary: Constants | Ctors | Methods | Inherited Methods

ScanCallback

public abstract class ScanCallback
extends Object

java.lang.Object
↳	android.bluetooth.le.ScanCallback

Bluetooth LE scan callbacks. Scan results are reported using these callbacks.

See also:

BluetoothLeScanner.startScan(ScanCallback)

Summary

Constants
`int`	`SCAN_FAILED_ALREADY_STARTED` Fails to start scan as BLE scan with the same settings is already started by the app.
`int`	`SCAN_FAILED_APPLICATION_REGISTRATION_FAILED` Fails to start scan as app cannot be registered.
`int`	`SCAN_FAILED_FEATURE_UNSUPPORTED` Fails to start power optimized scan as this feature is not supported.
`int`	`SCAN_FAILED_INTERNAL_ERROR` Fails to start scan due an internal error
`int`	`SCAN_FAILED_OUT_OF_HARDWARE_RESOURCES` Fails to start scan as it is out of hardware resources.
`int`	`SCAN_FAILED_SCANNING_TOO_FREQUENTLY` Fails to start scan as application tries to scan too frequently.

Public constructors
`ScanCallback()`

Public methods
`void`	`onBatchScanResults(List<ScanResult> results)` Callback when batch results are delivered.
`void`	`onScanFailed(int errorCode)` Callback when scan could not be started.
`void`	`onScanResult(int callbackType, ScanResult result)` Callback when a BLE advertisement has been found.

Inherited methods

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 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`	`wait(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`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Constants

SCAN_FAILED_ALREADY_STARTED

Added in API level 21

 public static final int SCAN_FAILED_ALREADY_STARTED

Fails to start scan as BLE scan with the same settings is already started by the app.

Constant Value: 1 (0x00000001)

SCAN_FAILED_APPLICATION_REGISTRATION_FAILED

Added in API level 21

 public static final int SCAN_FAILED_APPLICATION_REGISTRATION_FAILED

Fails to start scan as app cannot be registered.

Constant Value: 2 (0x00000002)

SCAN_FAILED_FEATURE_UNSUPPORTED

Added in API level 21

 public static final int SCAN_FAILED_FEATURE_UNSUPPORTED

Fails to start power optimized scan as this feature is not supported.

Constant Value: 4 (0x00000004)

SCAN_FAILED_INTERNAL_ERROR

Added in API level 21

 public static final int SCAN_FAILED_INTERNAL_ERROR

Fails to start scan due an internal error

Constant Value: 3 (0x00000003)

SCAN_FAILED_OUT_OF_HARDWARE_RESOURCES

Added in API level 33

 public static final int SCAN_FAILED_OUT_OF_HARDWARE_RESOURCES

Fails to start scan as it is out of hardware resources.

Constant Value: 5 (0x00000005)

SCAN_FAILED_SCANNING_TOO_FREQUENTLY

Added in API level 33

 public static final int SCAN_FAILED_SCANNING_TOO_FREQUENTLY

Fails to start scan as application tries to scan too frequently.

Constant Value: 6 (0x00000006)

Public constructors

ScanCallback

Added in API level 21

 public ScanCallback ()

Public methods

onBatchScanResults

Added in API level 21

 public void onBatchScanResults (List<ScanResult> results)

Callback when batch results are delivered.

Parameters
`results`	`List`: List of scan results that are previously scanned.

onScanFailed

Added in API level 21

 public void onScanFailed (int errorCode)

Callback when scan could not be started.

Parameters
`errorCode`	`int`: Error code (one of SCAN_FAILED_*) for scan failure. Value is `SCAN_FAILED_ALREADY_STARTED`, `SCAN_FAILED_APPLICATION_REGISTRATION_FAILED`, `SCAN_FAILED_INTERNAL_ERROR`, `SCAN_FAILED_FEATURE_UNSUPPORTED`, `SCAN_FAILED_OUT_OF_HARDWARE_RESOURCES`, or `SCAN_FAILED_SCANNING_TOO_FREQUENTLY`

onScanResult

Added in API level 21

 public void onScanResult (int callbackType, ScanResult result)

Callback when a BLE advertisement has been found.

Parameters
`callbackType`	`int`: Determines how this callback was triggered. Could be one of `ScanSettings.CALLBACK_TYPE_ALL_MATCHES`, `ScanSettings.CALLBACK_TYPE_FIRST_MATCH` or `ScanSettings.CALLBACK_TYPE_MATCH_LOST`
`result`	`ScanResult`: A Bluetooth LE scan result.