1

我有以下代码：

Line Code
 193 private Camera mCamera;
 <!-- NO CALLS TO mCamera HERE -->
 229 mCamera = Camera.open();
 230 Camera.Parameters p = mCamera.getParameters();

当我运行应用程序时，我得到以下堆栈跟踪：

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)

我正在使用的代码来自如何操作相机预览？

我有在CAMERA permission中的AndroidManifest.xml，所有imports的都占了。有人对如何解决此错误有任何建议吗？

谢谢你。

4

2 回答 2

3

在没有后置摄像头的设备上Camera.open()返回null。尝试Camera.open(0)获得前置摄像头。

于 2013-04-08T11:21:00.080 回答
1

如果 android 版本早于 3.0，请使用

getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

于 2013-04-08T11:07:20.730 回答