SimpleCamera.java

private void deinitialize() {
     stopPreview();
     releaseCamera();
     Log.d(TAG, "Camera Initialization has Been Undone");
 }

 private void initialize() {
     if (hasCamera(this) && getCameraInstance() != null) {
         startPreview();
         Log.d(TAG, "Camera Initialization has Been Completed");
     }
 }

 private void releaseCamera() {
     if (mCamera != null) {
         mCamera.release();
         mCamera = null;
         Log.d(TAG, "Camera Released");
     }
 }

 private void startPreview() {
     if (mCamera != null) {
         mCameraPreview = new SimpleCameraPreview(this, mCamera);
         FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
         preview.addView(mCameraPreview);
         Log.d(TAG, "Preview Started");
     }
 }

 private void stopPreview() {
     if (mCamera != null)
         mCamera.stopPreview();
     mCameraPreview = null;
     Log.d(TAG, "Preview Stopped");
 }