我有以下代碼:相機NullPointerException異常誤差參數
Line Code
193 private Camera mCamera;
<!-- NO CALLS TO mCamera HERE -->
229 mCamera = Camera.open();
230 Camera.Parameters p = mCamera.getParameters();
當我運行應用程序,我得到以下堆棧跟蹤:
04-08 20:56:45.330: E/AndroidRuntime(570): FATAL EXCEPTION: main
04-08 20:56:45.330: E/AndroidRuntime(570): java.lang.NullPointerException
04-08 20:56:45.330: E/AndroidRuntime(570): at com.soloman.cbc.FullscreenActivity$MySurfaceView.surfaceCreated(FullscreenActivity.java:230)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.view.SurfaceView.updateWindow(SurfaceView.java:569)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.view.SurfaceView.access$000(SurfaceView.java:86)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:174)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:680)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1842)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.view.Choreographer.doFrame(Choreographer.java:532)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.os.Handler.handleCallback(Handler.java:725)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.os.Handler.dispatchMessage(Handler.java:92)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.os.Looper.loop(Looper.java:137)
04-08 20:56:45.330: E/AndroidRuntime(570): at android.app.ActivityThread.main(ActivityThread.java:5039)
04-08 20:56:45.330: E/AndroidRuntime(570): at java.lang.reflect.Method.invokeNative(Native Method)
04-08 20:56:45.330: E/AndroidRuntime(570): at java.lang.reflect.Method.invoke(Method.java:511)
04-08 20:56:45.330: E/AndroidRuntime(570): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-08 20:56:45.330: E/AndroidRuntime(570): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-08 20:56:45.330: E/AndroidRuntime(570): at dalvik.system.NativeStart.main(Native Method)
我使用的代碼是從How can I manipulate the camera preview?
我有CAMERA permission
在AndroidManifest.xml
,和所有imports
都佔。有沒有人有任何建議如何解決這個錯誤?
謝謝。
你在哪裏試圖打開相機? 內表面創建函數? 如果你可以發佈你正在調用這個方法的函數,那麼給出一個答案會很有幫助 – 2013-04-08 11:16:19