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PO
primarykey
Id
7159930
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0
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CommunityOwnedDate
CreationDate
2011-08-23T10:56:00.870
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2011-08-23T11:05:01.337
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2011-08-23T11:05:01.337
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840960
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840960
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7159819
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2
Score
0
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text
Body
Yes, this was an improvement of the 2.3. I had this problem in 2.2 as well, there was no way to work on a preview image despite the fact this was theoretically possible according to the API. To solve this I had to actually take a picture using <code>Camera.takePicture(null, null, Camera.PictureCallback myCallback)</code> (see info <a href="http://file:///D:/android/android/android-sdk-windows/docs/reference/android/hardware/Camera.html#takePicture%28android.hardware.Camera.ShutterCallback,%20android.hardware.Camera.PictureCallback,%20android.hardware.Camera.PictureCallback,%20android.hardware.Camera.PictureCallback%29" rel="nofollow">here</a>) and then to implement a callback to handle the taken picture. The instance of the class that implements this callback is actually the parameter to pass to <code>Camera.takePicture()</code> and the callback method itself looks like this: <pre><code>public void onPictureTaken(byte[] JPEGData, Camera camera) { final Bitmap bitmap = createBitmapFromView(JPEGData); // do something with the Bitmap } </code></pre> Doing that way prevents the picture to be saved on the external storage with the regular pictures taken with the camera application. Should you need to serialize the <code>Bitmap</code> you'll have to do it explicitely. But it doesn't prevent the camera's trigger sound from being emitted. <code>Camera.takePicture()</code> has to be called wile the preview is running. <code>stopPreview()</code> can be called right after. One thing to be careful with /!\: <code>Camera.takePicture()</code> is not reentrant (at all). The callback must have returned before any subsequent call of <code>Camera.takePicture()</code>. This was freezing my phone, I had to shutdown and restart it before it to be usable again. As the action was triggered by a button, on my side, I had to shield it with a boolean: <pre><code>if (!mPictureTaken) { mPictureTaken = true; // absolutely NOT reentrant. Any double click sticks the phone otherwise. mCameraView.takePicture(callback); } </code></pre>
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1. POSurfaceView getting black when calling Camera.stopPreview()
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