search

saki4510t / UVCCamera

library and sample to access to UVC web camera on non-rooted Android device
3k stars 1.21k forks source link

android.graphics.SurfaceTexture com.serenegiant.usb.widget.CameraViewInterface.getSurfaceTexture()' on a null object reference #633

Open bandrarom opened 2 years ago

bandrarom commented 2 years ago

E/AndroidRuntime: FATAL EXCEPTION: main Process: io.agora.tutorials1v1vcall, PID: 18010 java.lang.NullPointerException: Attempt to invoke interface method 'android.graphics.SurfaceTexture com.serenegiant.usb.widget.CameraViewInterface.getSurfaceTexture()' on a null object reference at com.jiangdg.usbcamera.UVCCameraHelper.startPreview(UVCCameraHelper.java:324) at io.agora.tutorials1v1vcall.ui.slideshow.VideoCamerTesterFragment.onCreateView(VideoCamerTesterFragment.java:124) at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2698) at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:320) at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1187) at androidx.fragment.app.FragmentManager.addAddedFragments(FragmentManager.java:2224) at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:1997) at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:1953) at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1849) at androidx.fragment.app.FragmentManager$4.run(FragmentManager.java:413) at android.os.Handler.handleCallback(Handler.java:938) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:246) at android.app.ActivityThread.main(ActivityThread.java:8595) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)

i tried to make this app on fragment and i get this error

ghost commented 2 years ago

a SurfaceView may not be necessary you may try this repo: https://github.com/tsinglink/uvccamera and test with this apk: https://github.com/tsinglink/uvccamera/releases/download/1.0/simpleuvccamera-release.apk

KanwalKhan-20 commented 2 years ago

a SurfaceView may not be necessary you may try this repo: https://github.com/tsinglink/uvccamera and test with this apk: https://github.com/tsinglink/uvccamera/releases/download/1.0/simpleuvccamera-release.apk

It is not working :(

ghost commented 2 years ago

maybe the compatibility of the uvc camera is not very good. or maybe the compatibility of all USB-related devices is not good. it's very depressing, sometimes you have to dig into the very deep level of c code.

ghost commented 2 years ago

@KanwalKhan-20 I see a device or a camera, can't remember, Printing something like "mjpeg data is not legal". I suspect that the usb protocol is unreliable and will lose data. but I'm not sure