Android小程序录音aac格式一直报这个异常，容易在刚获取权限后复现：
W/System.err: java.lang.NullPointerException: Attempt to invoke virtual method 'byte[] io.dcloud.feature.audio.aac.AacEncode.offerEncoder(byte[])' on a null object reference
W/System.err: at io.dcloud.feature.audio.recorder.DataEncodeThread.processData(DataEncodeThread.java:114)
W/System.err: at io.dcloud.feature.audio.recorder.DataEncodeThread.onPeriodicNotification(DataEncodeThread.java:93)
W/System.err: at android.media.AudioRecord$NativeEventHandler.handleMessage(AudioRecord.java:1943)
W/System.err: at android.os.Handler.dispatchMessage(Handler.java:110)
W/System.err: at android.os.Looper.loop(Looper.java:219)
W/System.err: at io.dcloud.feature.audio.recorder.DataEncodeThread.run(DataEncodeThread.java:70)SDK版本：2.8.8
设备：华为P30
系统版本：Android 10
