Scheduler

java.lang.Object
- org.robolectric.util.Scheduler

```
public class Scheduler
extends java.lang.Object
```
Class that manages a queue of Runnables that are scheduled to run now (or at some time in the future). Runnables that are scheduled to run on the UI thread (tasks, animations, etc) eventually get routed to a Scheduler instance.

The execution of a scheduler can be in one of three states:
- paused (pause()): if paused, then no posted events will be run unless the Scheduler is explicitly instructed to do so, correctly matching Android's behavior.
- normal (unPause()): if not paused but not set to idle constantly, then the Scheduler will automatically run any Runnables that are scheduled to run at or before the Scheduler's current time, but it won't automatically run any future events. To run future events the Scheduler needs to have its clock advanced.
- idling constantly: if idleConstantly(boolean) is called with true, then the Scheduler will continue looping through posted events (including future events), advancing its clock as it goes.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class Scheduler.IdleState
Describes the current state of a Scheduler.

Nested Classes
Modifier and Type	Class and Description
`static class`	`Scheduler.IdleState` Describes the current state of a `Scheduler`.

Constructor Summary

Constructors
Constructor and Description

Scheduler()

Constructors
Constructor and Description
`Scheduler()`

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`boolean`	`advanceBy(long interval)` Deprecated. Use `advanceBy(long, TimeUnit)`.
`boolean`	`advanceBy(long amount, java.util.concurrent.TimeUnit unit)` Run all runnables that are scheduled to run in the next time interval.
`boolean`	`advanceTo(long endTime)` Run all runnables that are scheduled before the endTime.
`boolean`	`advanceToLastPostedRunnable()` Run all runnables in the queue, and any additional runnables they schedule that are scheduled before the latest scheduled runnable currently in the queue.
`boolean`	`advanceToNextPostedRunnable()` Run the next runnable in the queue.
`boolean`	`areAnyRunnable()` Determine if any enqueued runnables are enqueued before the current time.
`long`	`getCurrentTime()` Get the current time (as seen by the scheduler), in milliseconds.
`Scheduler.IdleState`	`getIdleState()` Retrieves the current idling state of this `Scheduler`.
`void`	`idleConstantly(boolean shouldIdleConstantly)` Deprecated. This method is ambiguous in how it should behave when turning off constant idle. Use `setIdleState(IdleState)` instead to explicitly set the state.
`boolean`	`isPaused()` Determine if the scheduler is paused.
`void`	`pause()` Pause the scheduler.
`void`	`post(java.lang.Runnable runnable)` Add a runnable to the queue.
`void`	`postAtFrontOfQueue(java.lang.Runnable runnable)` Add a runnable to the head of the queue.
`void`	`postDelayed(java.lang.Runnable runnable, long delayMillis)` Add a runnable to the queue to be run after a delay.
`void`	`postDelayed(java.lang.Runnable runnable, long delay, java.util.concurrent.TimeUnit unit)` Add a runnable to the queue to be run after a delay.
`void`	`remove(java.lang.Runnable runnable)` Remove a runnable from the queue.
`void`	`reset()` Reset the internal state of the Scheduler.
`boolean`	`runOneTask()` Run the next runnable in the queue.
`void`	`setIdleState(Scheduler.IdleState idleState)` Sets the current idling state of this `Scheduler`.
`int`	`size()` Return the number of enqueued runnables.
`void`	`unPause()` Un-pause the scheduler.

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

- Constructor Detail
  - Scheduler
```
public Scheduler()
```
- Method Detail
  - getIdleState
```
public Scheduler.IdleState getIdleState()
```
    Retrieves the current idling state of this Scheduler.
    
    Returns:
    
    The current idle state of this Scheduler.
    
    See Also:
    
    setIdleState(IdleState), isPaused()
  - setIdleState
```
public void setIdleState(Scheduler.IdleState idleState)
```
    Sets the current idling state of this Scheduler. If transitioning to the Scheduler.IdleState.UNPAUSED state any tasks scheduled to be run at or before the current time will be run, and if transitioning to the Scheduler.IdleState.CONSTANT_IDLE state all scheduled tasks will be run and the clock advanced to the time of the last runnable.
    
    Parameters:
    
    idleState - The new idle state of this Scheduler.
    
    See Also:
    
    setIdleState(IdleState), isPaused()
  - getCurrentTime
```
public long getCurrentTime()
```
    Get the current time (as seen by the scheduler), in milliseconds.
    
    Returns:
    
    Current time in milliseconds.
  - pause
```
public void pause()
```
    Pause the scheduler. Equivalent to setIdleState(PAUSED).
    
    See Also:
    
    unPause(), setIdleState(IdleState)
  - unPause
```
public void unPause()
```
    Un-pause the scheduler. Equivalent to setIdleState(UNPAUSED).
    
    See Also:
    
    pause(), setIdleState(IdleState)
  - isPaused
```
public boolean isPaused()
```
    Determine if the scheduler is paused.
    
    Returns:
    
    true if it is paused.
  - post
```
public void post(java.lang.Runnable runnable)
```
    Add a runnable to the queue.
    
    Parameters:
    
    runnable - Runnable to add.
  - postDelayed
```
public void postDelayed(java.lang.Runnable runnable,
                        long delayMillis)
```
    Add a runnable to the queue to be run after a delay.
    
    Parameters:
    
    runnable - Runnable to add.
    
    delayMillis - Delay in millis.
  - postDelayed
```
public void postDelayed(java.lang.Runnable runnable,
                        long delay,
                        java.util.concurrent.TimeUnit unit)
```
    Add a runnable to the queue to be run after a delay.
  - postAtFrontOfQueue
```
public void postAtFrontOfQueue(java.lang.Runnable runnable)
```
    Add a runnable to the head of the queue.
    
    Parameters:
    
    runnable - Runnable to add.
  - remove
```
public void remove(java.lang.Runnable runnable)
```
    Remove a runnable from the queue.
    
    Parameters:
    
    runnable - Runnable to remove.
  - advanceToLastPostedRunnable
```
public boolean advanceToLastPostedRunnable()
```
    Run all runnables in the queue, and any additional runnables they schedule that are scheduled before the latest scheduled runnable currently in the queue.
    
    Returns:
    
    True if a runnable was executed.
  - advanceToNextPostedRunnable
```
public boolean advanceToNextPostedRunnable()
```
    Run the next runnable in the queue.
    
    Returns:
    
    True if a runnable was executed.
  - advanceBy
```
@Deprecated
public boolean advanceBy(long interval)
```
    Deprecated. Use advanceBy(long, TimeUnit).
    
    Run all runnables that are scheduled to run in the next time interval.
    
    Parameters:
    
    interval - Time interval (in millis).
    
    Returns:
    
    True if a runnable was executed.
  - advanceBy
```
public boolean advanceBy(long amount,
                         java.util.concurrent.TimeUnit unit)
```
    Run all runnables that are scheduled to run in the next time interval.
    
    Returns:
    
    True if a runnable was executed.
  - advanceTo
```
public boolean advanceTo(long endTime)
```
    Run all runnables that are scheduled before the endTime.
    
    Parameters:
    
    endTime - Future time.
    
    Returns:
    
    True if a runnable was executed.
  - runOneTask
```
public boolean runOneTask()
```
    Run the next runnable in the queue.
    
    Returns:
    
    True if a runnable was executed.
  - areAnyRunnable
```
public boolean areAnyRunnable()
```
    Determine if any enqueued runnables are enqueued before the current time.
    
    Returns:
    
    True if any runnables can be executed.
  - reset
```
public void reset()
```
    Reset the internal state of the Scheduler.
  - size
```
public int size()
```
    Return the number of enqueued runnables.
    
    Returns:
    
    Number of enqueues runnables.
  - idleConstantly
```
@Deprecated
public void idleConstantly(boolean shouldIdleConstantly)
```
    Deprecated. This method is ambiguous in how it should behave when turning off constant idle. Use setIdleState(IdleState) instead to explicitly set the state.
    
    Set the idle state of the Scheduler. If necessary, the clock will be advanced and runnables executed as required by the newly-set state.
    
    Parameters:
    
    shouldIdleConstantly - If true the idle state will be set to Scheduler.IdleState.CONSTANT_IDLE, otherwise it will be set to Scheduler.IdleState.UNPAUSED.

Class Scheduler

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Scheduler

Method Detail

getIdleState

setIdleState

getCurrentTime

pause

unPause

isPaused

post

postDelayed

postDelayed

postAtFrontOfQueue

remove

advanceToLastPostedRunnable

advanceToNextPostedRunnable

advanceBy

advanceBy

advanceTo

runOneTask

areAnyRunnable

reset

size

idleConstantly