FrameMetrics
class FrameMetrics
| kotlin.Any | |
| ↳ | android.view.FrameMetrics |
Class containing timing data for various milestones in a frame lifecycle reported by the rendering subsystem.
Supported metrics can be queried via their corresponding identifier.
Summary
| Constants | |
|---|---|
| static Int |
Metric identifier for animation callback duration. |
| static Int |
Metric identifier for command issue duration. |
| static Int |
Metric identifier for the total duration that was available to the app to produce a frame. |
| static Int |
Metric identifier for draw duration. |
| static Int |
Metric identifier for a boolean value determining whether this frame was the first to draw in a new Window layout. |
| static Int |
Metric identifier for GPU duration. |
| static Int |
Metric identifier for input handling duration. |
| static Int |
Metric identifier for the timestamp of the intended vsync for this frame. |
| static Int |
Metric identifier for layout/measure duration. |
| static Int |
Metric identifier for swap buffers duration. |
| static Int |
Metric identifier for sync duration. |
| static Int |
Metric identifier for total frame duration. |
| static Int |
Metric identifier for unknown delay. |
| static Int |
Metric identifier for the timestamp of the actual vsync for this frame. |
| Public constructors | |
|---|---|
FrameMetrics(other: FrameMetrics!)Constructs a FrameMetrics object as a copy. |
|
| Public methods | |
|---|---|
| Long |
Retrieves the value associated with Metric identifier |
Constants
ANIMATION_DURATION
static val ANIMATION_DURATION: Int
Metric identifier for animation callback duration.
Represents the number of nanoseconds elapsed issuing animation callbacks.
Value: 2
COMMAND_ISSUE_DURATION
static val COMMAND_ISSUE_DURATION: Int
Metric identifier for command issue duration.
Represents the number of nanoseconds elapsed issuing draw commands to the GPU.
Value: 6
DEADLINE
static val DEADLINE: Int
Metric identifier for the total duration that was available to the app to produce a frame.
Represents the total time in nanoseconds the system allocated for the app to produce its frame. If FrameMetrics.TOTAL_DURATION < FrameMetrics.DEADLINE, the app hit its intended deadline and there was no jank visible to the user.
Value: 13
DRAW_DURATION
static val DRAW_DURATION: Int
Metric identifier for draw duration.
Represents the number of nanoseconds elapsed computing DisplayLists for transformations applied to the view hierarchy.
Value: 4
FIRST_DRAW_FRAME
static val FIRST_DRAW_FRAME: Int
Metric identifier for a boolean value determining whether this frame was the first to draw in a new Window layout.
getMetric(int) will return 0 for false, 1 for true.
First draw frames are expected to be slow and should usually be exempt from display jank calculations as they do not cause skips in animations and are usually hidden by window animations or other tricks.
Value: 9
GPU_DURATION
static val GPU_DURATION: Int
Metric identifier for GPU duration.
Represents the total time in nanoseconds this frame took to complete on the GPU.
Value: 12
INPUT_HANDLING_DURATION
static val INPUT_HANDLING_DURATION: Int
Metric identifier for input handling duration.
Represents the number of nanoseconds elapsed issuing input handling callbacks.
Value: 1
INTENDED_VSYNC_TIMESTAMP
static val INTENDED_VSYNC_TIMESTAMP: Int
Metric identifier for the timestamp of the intended vsync for this frame.
The intended start point for the frame. If this value is different from VSYNC_TIMESTAMP, there was work occurring on the UI thread that prevented it from responding to the vsync signal in a timely fashion.
Value: 10
LAYOUT_MEASURE_DURATION
static val LAYOUT_MEASURE_DURATION: Int
Metric identifier for layout/measure duration.
Represents the number of nanoseconds elapsed measuring and laying out the invalidated pieces of the view hierarchy.
Value: 3
SWAP_BUFFERS_DURATION
static val SWAP_BUFFERS_DURATION: Int
Metric identifier for swap buffers duration.
Represents the number of nanoseconds elapsed issuing the frame buffer for this frame to the display subsystem.
Value: 7
SYNC_DURATION
static val SYNC_DURATION: Int
Metric identifier for sync duration.
Represents the number of nanoseconds elapsed synchronizing the computed display lists with the render thread.
Value: 5
TOTAL_DURATION
static val TOTAL_DURATION: Int
Metric identifier for total frame duration.
Represents the total time in nanoseconds this frame took to render and be issued to the display subsystem.
The total duration is the difference in time between when the frame began and when it ended. This value may not be exactly equal to the sum of the values of all other time-valued metric identifiers because some stages may happen concurrently.
Value: 8
UNKNOWN_DELAY_DURATION
static val UNKNOWN_DELAY_DURATION: Int
Metric identifier for unknown delay.
Represents the number of nanoseconds elapsed waiting for the UI thread to become responsive and process the frame. This should be 0 most of the time.
Value: 0
VSYNC_TIMESTAMP
static val VSYNC_TIMESTAMP: Int
Metric identifier for the timestamp of the actual vsync for this frame.
The time value that was used in all the vsync listeners and drawing for the frame (Choreographer frame callbacks, animations, View#getDrawingTime(), etc.)
Value: 11
Public constructors
FrameMetrics
FrameMetrics(other: FrameMetrics!)
Constructs a FrameMetrics object as a copy.
Use this method to copy out metrics reported by Window.OnFrameMetricsAvailableListener#onFrameMetricsAvailable(
| Parameters | |
|---|---|
other |
FrameMetrics!: the FrameMetrics object to copy. |
Public methods
getMetric
fun getMetric(id: Int): Long
Retrieves the value associated with Metric identifier id for this frame.
Boolean metrics are represented in [0,1], with 0 corresponding to false, and 1 corresponding to true.
| Return | |
|---|---|
Long |
the value of the metric or -1 if it is not available. |