我有一个扫描二维码的android应用。然后，它通过显示网站的可点击链接来显示结果。当我单击链接时，我将被重定向到该网站，但是当我单击手机上的“后退”按钮时，它应该返回到应用程序，但出现错误。它说该应用程序停止了。我认为从网站返回时，我没有处理活动的代码。
你能帮我么？我该怎么办？谢谢。:)
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)
根据https://stackoverflow.com/a/15358323/1590950
public void onPause() {
super.onPause();
if (mCamera != null) {
mCamera.setPreviewCallback(null);
mPreview.getHolder().removeCallback(mPreview); // you need this line
mCamera.release();
}
}
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我来说两句