Java 从Web意图返回，Android摄像头应用程序停止

我有一个android应用程序可以扫描二维码。然后，它通过显示网站的可点击链接来显示结果。当我点击链接时，我会被重定向到网站，但当我点击手机上的后退按钮时，它会返回到应用程序，但出现错误。上面说应用程序停止了。我想我没有代码来处理我从网站返回时的活动

你能帮帮我吗？我该怎么办？ 谢谢。：）

依照

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没有任何日志可以查看错误的详细信息吗？您应该发布logcat，以便我们可以分析您的错误。现在可能会从网站返回重复的错误，但摄像头不工作。不工作如何？如果你不分享logcat/stacktrace和相关代码，你希望我们神秘地知道发生了什么…没有摄像头预览。它只是一个黑屏。

03-02 20:58:53.454: E/AndroidRuntime(11165): FATAL EXCEPTION: main
03-02 20:58:53.454: E/AndroidRuntime(11165): java.lang.RuntimeException: Method called after release()
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.hardware.Camera.setPreviewDisplay(Native Method)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.hardware.Camera.setPreviewDisplay(Camera.java:519)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at net.sourceforge.zbar.android.CameraTest.CameraPreview.surfaceCreated(CameraPreview.java:63)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.SurfaceView.updateWindow(SurfaceView.java:605)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:237)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.View.dispatchWindowVisibilityChanged(View.java:8019)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1081)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1081)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1081)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1081)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:1081)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1497)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1237)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5162)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:791)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.Choreographer.doCallbacks(Choreographer.java:591)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.Choreographer.doFrame(Choreographer.java:561)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:777)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.os.Handler.handleCallback(Handler.java:725)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.os.Handler.dispatchMessage(Handler.java:92)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.os.Looper.loop(Looper.java:176)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at android.app.ActivityThread.main(ActivityThread.java:5317)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at java.lang.reflect.Method.invokeNative(Native Method)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at java.lang.reflect.Method.invoke(Method.java:511)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
03-02 20:58:53.454: E/AndroidRuntime(11165):    at dalvik.system.NativeStart.main(Native Method)

public void onPause() {
    super.onPause();

    if (mCamera != null) {
        mCamera.setPreviewCallback(null);
        mPreview.getHolder().removeCallback(mPreview);   // you need this line
        mCamera.release();
    }
}