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Added in API level 24

public static interface Window.OnFrameMetricsAvailableListener

android.view.Window.OnFrameMetricsAvailableListener

针对需要窗口呈现的每个帧的帧定时信息的客户端的回调。

Public methods
`abstract void`	`onFrameMetricsAvailable(Window window, FrameMetrics frameMetrics, int dropCountSinceLastInvocation)` 当信息可用于先前渲染的帧时调用。

Added in API level 24

void onFrameMetricsAvailable (Window window, 
                FrameMetrics frameMetrics, 
                int dropCountSinceLastInvocation)

当信息可用于先前渲染的帧时调用。如果此回调执行时间过长，报告可能会丢失，因为报告生产者无法等待消费者完成。我们强烈建议客户副本中FrameMetrics通过传递FrameMetrics(FrameMetrics)在此方法中，并推迟额外的计算或存储到另一个线程，以避免不必要下降的报告。

Parameters
`window`	`Window`: The `Window` on which the frame was displayed.
`frameMetrics`	`FrameMetrics`: the available metrics. This object is reused on every call and thus this reference is not valid outside the scope of this method.
`dropCountSinceLastInvocation`	`int`: the number of reports dropped since the last time this callback was invoked.