android - Exoplayer2 onBandwidthSample

Question

我正在使用 Exoplayer2，当我覆盖该onBandwidthSample方法时我没有回调。我在做什么坏事？这是我的代码：

        new DefaultBandwidthMeter(new Handler(), new BandwidthMeter.EventListener() {
            @Override
            public void onBandwidthSample(int elapsedMs, long bytes, long bitrate) {
                Log.i(TAG, "onBandwidthSample bitrateEstimate = " + bitrate);
                Log.i(TAG, "onBandwidthSample bytesDownloaded = " + bytes);
            }
        });