切换至JZMediaExo内核 报 NullPointerException

[zippo88888888]

**什么jzvd版本
7.7.0

**什么播放器内核
JZMediaExo

**相关log是什么

Process: cn.jzvd.demo, PID: 21648
    java.lang.NullPointerException: Attempt to invoke virtual method 'int android.media.AudioManager.getStreamVolume(int)' on a null object reference
        at cn.jzvd.Jzvd.touchActionMove(Jzvd.java:470)
        at cn.jzvd.Jzvd.onTouch(Jzvd.java:403)
        at cn.jzvd.JzvdStd.onTouch(JzvdStd.java:323)
        at android.view.View.dispatchTouchEvent(View.java:14864)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3125)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2798)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3131)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2812)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3131)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2812)
        at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3131)
        at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2812)
        at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:576)
        at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1895)
        at android.app.Activity.dispatchTouchEvent(Activity.java:4353)
        at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:69)
        at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:534)
        at android.view.View.dispatchPointerEvent(View.java:15143)
        at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:6723)
        at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:6511)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5952)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:6009)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5975)
        at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:6140)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5983)
        at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:6197)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5956)
        at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:6009)
        at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5975)
        at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5983)
        at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5956)
        at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:8993)
        at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:8944)
        at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:8912)
        at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:9129)
        at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:285)
        at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
        at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:257)
        at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:9075)
        at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:9215)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1188)
        at android.view.Choreographer.doCallbacks(Choreographer.java:978)
        at android.view.Choreographer.doFrame(Choreographer.java:887)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1170)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loopOnce(Looper.java:211)
        at android.os.Looper.loop(Looper.java:300)
        at android.app.ActivityThread.main(ActivityThread.java:8237)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1046)

**demo是否有这个问题
有

**自己做了哪些修改
无

**如何操作复现
切换内核至JZMediaExo，播放后全屏，通过手势控制音量，闪退

**什么安卓版本，什么机型
Android12 小米12S

**截图或者视频说明情况

解决办法：

在 Jzvd 471行 增加空判定即可解决

if (mAudioManager == null) {
    mAudioManager = (AudioManager) getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
}