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PONullpointerException onPictureTaken
 

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  1. PONullpointerException onPictureTaken
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    <p>I got some problems with taking pictures via android camera.</p> <p>The main purpose is by using <code>CameraControlView</code> preview the camera and take picture via a button.</p> <pre><code>String fileName = Environment.getExternalStorageDirectory().getPath() + "/sample_picture.jpg"; Bitmap photo; mOpenCvCameraView.takePicture(fileName); //viewNavi.setDisplayedChild(viewNavi.indexOfChild(findViewById(R.id.image_view))); viewNavi.showNext(); Bitmap newp =BitmapFactory.decodeFile(fileName); if(newp==null) return; ImageView imgViewResult = (ImageView) findViewById(R.id.imgViewResult); imgViewResult.setImageBitmap(newp); </code></pre> <p><code>CameraControlView.takePicture(fileLocation);</code> I want to use the saved picture on an imageView after that point but I could not, because saving the picture progress is not done yet (which is run by <code>OnPictureTaken</code>). So I wanted to be sure if the taking picture process is done. Then I found a useful explaination on the internet which is the <code>OnPictureTaken</code> progress is the responsible method for saving pictures:</p> <pre><code>public void onPictureTaken(byte[] data, Camera camera) { Log.i(TAG, "Saving a bitmap to file"); // The camera preview was automatically stopped. Start it again. mCamera.startPreview(); mCamera.setPreviewCallback(this); // Write the image in a file (in jpeg format) /*My code ImageView imgResult = (ImageView) findViewById(R.id.imgViewResult); Bitmap newp = BitmapFactory.decodeByteArray(data, 0, data.length); imgResult.setImageBitmap(newp); */ try { FileOutputStream fos = new FileOutputStream(mPictureFileName); fos.write(data); fos.close(); } catch (java.io.IOException e) { Log.e("PictureDemo", "Exception in photoCallback", e); } isPictureTaken = true; } </code></pre> <p>The real problem is when I tried to add this code segment:</p> <pre><code> ImageView imgResult = (ImageView) findViewById(R.id.imgViewResult); Bitmap newp = BitmapFactory.decodeByteArray(data, 0, data.length); imgResult.setImageBitmap(newp); </code></pre> <p>In to the <code>onPictureTaken</code> as shown above. I got a <code>NullPointerException</code>.</p> <p>Is there a way that only take taken picture into a bitmap, and in sync way (means the way I have been using is not suitable for my project. When I want to setImageBitmap after takePicture. The code sends me previous taken pic[because I am using the same save location and overwrite the pic] or null) </p> <p>Any explanation would be great.</p> <p>Thanks for your time.</p>
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    1. USuser1703391
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    1. COtry to use intent ACTION_IMAGE_CAPTURE for taken the picture from camera, Because it open the defualt camera of the Android device and saved at the sd card.
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      1. PONullpointerException onPictureTaken
      1. USSunil Kumar
    2. COThanks sunil. I am aware of intent actionview. However if I use intent actionview I need to take care of the saved pictures into the gallery (After some point memory is going to fulfill with the unwanted pictures). Also I don't want to users should not be able to change any setting on the picture taking screen. Because camera interface is various on different android devices.
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      1. USuser1703391
 

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