getParameters failed (empty parameters)

2020-05-14 19:41:18.803 11350-11350/com.example.camera E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.camera, PID: 11350
    java.lang.RuntimeException: getParameters failed (empty parameters)
        at android.hardware.Camera.native_getParameters(Native Method)
        at android.hardware.Camera.getParameters(Camera.java:2234)
        at com.example.camera.MediaRecoderActivity.initializeRecorder(MediaRecoderActivity.java:128)
        at com.example.camera.MediaRecoderActivity.startRecoder(MediaRecoderActivity.java:102)
        at com.example.camera.MediaRecoderActivity.onClick(MediaRecoderActivity.java:67)
        at android.view.View.performClick(View.java:6597)
        at android.view.View.performClickInternal(View.java:6574)
        at android.view.View.access$3100(View.java:778)
        at android.view.View$PerformClick.run(View.java:25889)
        at android.os.Handler.handleCallback(Handler.java:873)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6746)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

產生原因：
getParameters不能在mCamera.startPreview()之後獲取
所以如果有什麼參數要獲取的話，比如獲取相機支持的預覽尺寸：
List<Camera.Size> sizes = mCamera.getParameters().getSupportedPreviewSizes();
這個就要在mCamera.startPreview()之前完成。