How to take pictures from the camera without preview when my app starts?

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Use below code. Its Tested and Worked for me. Any issues please feel free to put comments. 

private void takeSnapShots()
{
      Toast.makeText(getApplicationContext(), "Image snapshot   Started",Toast.LENGTH_SHORT).show();
     // here below "this" is activity context.  
 SurfaceView surface = new SurfaceView(this);
    Camera camera = Camera.open();
    try {
        camera.setPreviewDisplay(surface.getHolder());
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    camera.startPreview();
    camera.takePicture(null,null,jpegCallback);
}


 /** picture call back */
PictureCallback jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) 
{
    FileOutputStream outStream = null;
    try {
  String dir_path = "";// set your directory path here
        outStream = new FileOutputStream(dir_path+File.separator+image_name+no_pics+".jpg");    
        outStream.write(data);
        outStream.close();
        Log.d(TAG, "onPictureTaken - wrote bytes: " + data.length);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally 
    {
        camera.stopPreview();
        camera.release();
        camera = null;
        Toast.makeText(getApplicationContext(), "Image snapshot Done",Toast.LENGTH_LONG).show();


    }
    Log.d(TAG, "onPictureTaken - jpeg");
}
};

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