SntpClient (ExoPlayer library)

java.lang.Object
- com.google.android.exoplayer2.util.SntpClient

```
public final class SntpClient
extends Object
```
Static utility to retrieve the device time offset using SNTP.
Based on the Android framework SntpClient.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static interface SntpClient.InitializationCallback
Callback for calls to initialize(Loader, InitializationCallback).

Nested Classes
Modifier and Type	Class	Description
`static interface`	`SntpClient.InitializationCallback`	Callback for calls to `initialize(Loader, InitializationCallback)`.

Field Summary

Fields
Modifier and Type Field Description

static String DEFAULT_NTP_HOST
The default NTP host address used to retrieve getElapsedRealtimeOffsetMs().

Fields
Modifier and Type	Field	Description
`static String`	`DEFAULT_NTP_HOST`	The default NTP host address used to retrieve `getElapsedRealtimeOffsetMs()`.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static long`	`getElapsedRealtimeOffsetMs()`	Returns the offset between `SystemClock.elapsedRealtime()` and the NTP server time in milliseconds, or `C.TIME_UNSET` if `isInitialized()` returns false.
`static String`	`getNtpHost()`	Returns the NTP host address used to retrieve `getElapsedRealtimeOffsetMs()`.
`static void`	`initialize(Loader loader, SntpClient.InitializationCallback callback)`	Starts loading the device time offset.
`static boolean`	`isInitialized()`	Returns whether the device time offset has already been loaded.
`static void`	`setNtpHost(String ntpHost)`	Sets the NTP host address used to retrieve `getElapsedRealtimeOffsetMs()`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DEFAULT_NTP_HOST
```
public static final String DEFAULT_NTP_HOST
```
    The default NTP host address used to retrieve getElapsedRealtimeOffsetMs().
    
    See Also:
    
    Constant Field Values
- Method Detail
  - getNtpHost
```
public static String getNtpHost()
```
    Returns the NTP host address used to retrieve getElapsedRealtimeOffsetMs().
  - setNtpHost
```
public static void setNtpHost(String ntpHost)
```
    Sets the NTP host address used to retrieve getElapsedRealtimeOffsetMs().
    The default is DEFAULT_NTP_HOST.
    If the new host address is different from the previous one, the NTP client will be isInitialized() uninitialized} again.
    
    Parameters:
    
    ntpHost - The NTP host address.
  - isInitialized
```
public static boolean isInitialized()
```
    Returns whether the device time offset has already been loaded.
    If false, use initialize(Loader, InitializationCallback) to start the initialization.
  - getElapsedRealtimeOffsetMs
```
public static long getElapsedRealtimeOffsetMs()
```
    Returns the offset between SystemClock.elapsedRealtime() and the NTP server time in milliseconds, or C.TIME_UNSET if isInitialized() returns false.
    The offset is calculated as ntpServerTime - deviceElapsedRealTime.
  - initialize
```
public static void initialize(@Nullable
                              Loader loader,
                              @Nullable
                              SntpClient.InitializationCallback callback)
```
    Starts loading the device time offset.
    
    Parameters:
    
    loader - A Loader to use for loading the time offset, or null to create a new one.
    
    callback - An optional SntpClient.InitializationCallback to be notified when the time offset has been initialized or initialization failed.

Class SntpClient

Nested Class Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_NTP_HOST

Method Detail

getNtpHost

setNtpHost

isInitialized

getElapsedRealtimeOffsetMs

initialize