<SeekBar
  android:id="@+id/seekBar_distance"
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:layout_gravity="center_vertical"
  android:layout_weight="1"
  android:max="37"
  android:onProgressChanged="@{viewModel.onAudioDistanceBarChanged}"
  android:progress="@{viewModel.mAudioInputDistance}"
   />

//java代码
public final ObservableInt mAudioInputDistance = new ObservableInt(0);
public void onAudioDistanceBarChanged(SeekBar seekBar, int progress, boolean fromUser) {
        mAudioInputDistance.set(progress);
    }