RequirementsWatcher (ExoPlayer library)

java.lang.Object
- com.google.android.exoplayer2.scheduler.RequirementsWatcher

```
public final class RequirementsWatcher
extends Object
```
Watches whether the Requirements are met and notifies the RequirementsWatcher.Listener on changes.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static interface`	`RequirementsWatcher.Listener`	Notified when RequirementsWatcher instance first created and on changes whether the `Requirements` are met.

Constructor Summary

Constructors
Constructor Description

RequirementsWatcher(Context context, RequirementsWatcher.Listener listener, Requirements requirements)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Requirements`	`getRequirements()`	Returns watched `Requirements`.
`@com.google.android.exoplayer2.scheduler.Requirements.RequirementFlags int`	`start()`	Starts watching for changes.
`void`	`stop()`	Stops watching for changes.

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

- Constructor Detail
  - RequirementsWatcher
```
public RequirementsWatcher(Context context,
                           RequirementsWatcher.Listener listener,
                           Requirements requirements)
```
    Parameters:
    
    context - Any context.
    
    listener - Notified whether the Requirements are met.
    
    requirements - The requirements to watch.
- Method Detail
  - start
```
@RequirementFlags
public @com.google.android.exoplayer2.scheduler.Requirements.RequirementFlags int start()
```
    Starts watching for changes. Must be called from a thread that has an associated Looper. Listener methods are called on the caller thread.
    
    Returns:
    
    Initial RequirementFlags that are not met, or 0.
  - stop
```
public void stop()
```
    Stops watching for changes.
  - getRequirements
```
public Requirements getRequirements()
```
    Returns watched Requirements.