Android摄像头应用程序-暂停/退出时出错

每次退出/暂停相机活动时，我的应用程序都会崩溃。我认为这可能与暂停/退出时释放相机有关，但我不确定具体在哪里操作。如能解释，将不胜感激。谢谢

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CameraActivity.java

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编辑：这里有个例外

08-18 01:18:50.242: ERROR/AndroidRuntime(10222): FATAL EXCEPTION: main
08-18 01:18:50.242: ERROR/AndroidRuntime(10222): java.lang.RuntimeException: Method called after release()
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at android.hardware.Camera.setHasPreviewCallback(Native Method)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at android.hardware.Camera.access$600(Camera.java:114)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at android.hardware.Camera$EventHandler.handleMessage(Camera.java:545)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at android.os.Looper.loop(Looper.java:143)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at android.app.ActivityThread.main(ActivityThread.java:4196)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at java.lang.reflect.Method.invokeNative(Native Method)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at java.lang.reflect.Method.invoke(Method.java:507)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at dalvik.system.NativeStart.main(Native Method)

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编辑：对不起，我收回以前的解决方案。

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问题在于onPreviewFrame回调，为什么需要它？设置预览显示后，您无需使视图无效，这将由相机自动完成。

请注意，我已编辑了答案。非常感谢您的快速回复，它现在可以正常工作了。我的代码是基于web示例编写的，我不完全确定它是如何工作的。

public class Preview extends SurfaceView implements SurfaceHolder.Callback { 
SurfaceHolder mHolder;
public Camera camera; 

Preview(Context context) {
    super(context);

    mHolder = getHolder(); 
    mHolder.addCallback(this); 
    mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

public void surfaceCreated(SurfaceHolder holder) {
    camera = Camera.open(); 
    camera.setDisplayOrientation(90);

    try {

        camera.setPreviewDisplay(holder); 
        camera.setPreviewCallback(new PreviewCallback() { 
            public void onPreviewFrame(byte[] data, Camera camera) { 
                Preview.this.invalidate(); 
            }
        });
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public void surfaceDestroyed(SurfaceHolder holder) { 
    camera.stopPreview();
    camera.release();
    camera = null;
}

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
    camera.startPreview();
}

}

08-18 01:18:50.242: ERROR/AndroidRuntime(10222): FATAL EXCEPTION: main
08-18 01:18:50.242: ERROR/AndroidRuntime(10222): java.lang.RuntimeException: Method called after release()
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at android.hardware.Camera.setHasPreviewCallback(Native Method)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at android.hardware.Camera.access$600(Camera.java:114)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at android.hardware.Camera$EventHandler.handleMessage(Camera.java:545)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at android.os.Looper.loop(Looper.java:143)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at android.app.ActivityThread.main(ActivityThread.java:4196)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at java.lang.reflect.Method.invokeNative(Native Method)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at java.lang.reflect.Method.invoke(Method.java:507)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-18 01:18:50.242: ERROR/AndroidRuntime(10222):     at dalvik.system.NativeStart.main(Native Method)